CENTRAL ILLINOIS PUBLIC SERVICE CO - 10-K Annual Report

Fair Value

Less than 5 years

5 years to 10 years

Due after 10 years

Ameren	UE	CIPS	Genco	CILCORP(parent)	CILCO	IP
9,388^(a)	3,944	754	596	4	769	1,722

(a) Total for Ameren includes Ameren Registrant and non-Registrant subsidiaries.

The IBEW, the IUOE, the NCF&O, and the Laborers and Gas Fitters labor unions represent approximately 63% of Ameren’s total employees, and 73%, 68%, 67%, 63%, 63% and 70% of the employees of UE, CIPS, Genco, CILCORP, CILCO and IP, respectively. An IBEW contract representing a portion of UE workers expires in 2006. Contracts with the Laborers and Gas Fitters labor unions that represent a portion of IP employees also expire in 2006. IP is in discussions to have those agreements extended. The remaining agreements covering UE, CIPS, Genco, CILCORP, CILCO and IP employees expire in 2007.

For additional information regarding our business operations and factors affecting our operations and financial position, see Management’s Discussion and Analysis of Financial Condition and Results of Operations under Part II, Item 7, of this report and Note 1 - Summary of Significant Accounting Policies to our financial statements under Part II, Item 8, of this report. For additional information regarding reporting segments, see Note 18 - Segment Information to our financial statements under Part II, Item 8, of this report.

RATES AND REGULATION

Rates

Rates that UE, CIPS, CILCO and IP are allowed to charge for their services are the single most important item influencing their and Ameren’s consolidated results of operations, financial position, and liquidity. The rates charged to UE, CIPS, CILCO and IP customers are determined by governmental organizations. Decisions by these organizations are influenced by many factors, including the cost of providing service, the quality of service, regulatory staff knowledge and experience, economic conditions, public policy, and social and political views. Decisions made by these organizations regarding rates could have a material impact on the results of operations, financial position and liquidity of UE, CIPS, CILCORP, CILCO, IP and Ameren on a consolidated basis.

UE, CIPS, CILCO and IP are subject to regulation by the ICC. UE is also subject to regulation by the MoPSC, as to rates, service, issuance of equity securities, issuance of debt having a maturity of more than 12 months, mergers, affiliate transactions, and various other matters. Genco is not subject to regulation by the ICC or the MoPSC. See Note 3 - Rate and Regulatory Matters to our financial statements under Part II, Item 8, of this report for information regarding UE’s proposed discontinuance of its utility operations subject to ICC

jurisdiction by transferring its Illinois-based electric and natural gas transmission and distribution business to CIPS.

UE, CIPS, Genco, CILCO and IP are also subject to regulation by the FERC as to their ability to charge market-based rates in connection with the wholesale sale of energy and transmission in interstate commerce, mergers, affiliate transactions, and various other matters. Less than 5% of our electric revenues relate to transmission revenues regulated by the FERC. Issuance of short-term and long-term debt by Genco is subject to approval by the FERC.

The following table presents the approximate percentage of electric operating revenues subject to regulation by the MoPSC and the ICC for each of the Ameren Companies for the year ended December 31, 2004:

	MoPSC	ICC
Ameren^(a)	46%	36%
UE	79	6
CIPS	-	92
Genco	-	-
CILCORP	-	88
CILCO	-	88
IP	-	100

(a) Includes amounts for IP since the acquisition date of September 30, 2004; includes amounts for Ameren Registrant and non-Registrant subsidiaries and intercompany eliminations.

The following table presents the approximate percentage of gas operating revenues subject to regulation by the MoPSC and the ICC for each of the Ameren Companies for the year ended December 31, 2004:

	MoPSC	ICC
Ameren^(a)	16%	84%
UE	87	13
CIPS	-	100
CILCORP	-	100
CILCO	-	100
IP	-	100

(a) Includes amounts for IP since the acquisition date of September 30, 2004; includes amounts for Ameren Registrant and non-Registrant subsidiaries and intercompany eliminations.

If certain criteria are met, UE’s, CIPS’, CILCO’s and IP’s electric and gas rates may be adjusted without the necessity of a traditional rate proceeding. PGA clauses allow for prudently incurred natural gas purchase costs to be passed directly to the consumer in Missouri and Illinois. There is no similar provision that would allow regulated electric operations fuel or purchased power costs to pass directly to the consumer. Environmental adjustment rate riders authorized by the ICC permit the recovery of prudently incurred MGP remediation and litigation costs from UE’s, CIPS’, CILCO’s and IP’s Illinois electric and natural gas utility customers. As a part of the order approving Ameren’s acquisition of IP, the ICC authorized IP to implement a tariff rider to recover 90% of the costs of asbestos-related litigation claims in excess of $20 million from its electric utility customers, subject to certain terms, beginning in 2007. MoPSC natural gas pipeline replacement cost clauses allow the recovery of infrastructure replacement costs from gas utility customers. However, UE agreed to not seek recovery under these clauses before January 1, 2006, in conjunction with its 2003 Missouri gas rate case settlement.

For further information on rate matters, including UE’s 2002 Missouri electric rate case settlement, UE’s 2004 Missouri gas rate case settlement, IP’s 2004 pending gas rate case, and the ending of rate moratoriums in Missouri and Illinois in 2006, see Results of Operations in Management’s Dis-cussion and Analysis of Financial Condition and Results of Operations under Part II, Item 7, Quantitative and Qualitative Disclosures About Market Risk under Part II, Item 7A, and Note 3 - Rate and Regulatory Matters and Note 15 - Commitments and Contingencies to our financial statements under Part II, Item 8, of this report.

General Regulatory Matters

As a holding company registered with the SEC under the PUHCA, Ameren is subject to the regulatory provisions of the PUHCA, including provisions relating to the issuance of securities, sales and acquisitions of securities and utility assets, affiliate transactions, financial reporting requirements, the services performed by Ameren Services and AFS, and the activities of certain other subsidi-aries. Issuance of common stock and short-term and long-term debt and other securities by Ameren and CILCORP and issuance of debt having a maturity of 12 months or less by UE, CIPS, CILCO and IP are subject to approval by the SEC under the PUHCA.

Genco is certified by the FERC as an “exempt wholesale generator” under the Energy Policy Act of 1992; Genco is not a “public utility company” under the PUHCA. As an exempt wholesale generator, Genco is exempt from most of the provisions of the PUHCA that otherwise would apply to it as a subsidiary of a registered holding company. Issuance of securities by Genco is not subject to approval by the SEC under the PUHCA. The SEC may impose limitations on Ameren in connection with its financing for the purpose of investing in exempt wholesale generators and foreign utility companies if Ameren’s aggregate investment in those activities exceeds 50% of its consolidated retained earnings. At December 31, 2004, Ameren’s aggregate invest-ment in exempt wholesale generators was 32% of its consolidated retained earnings. Ameren has no investment in foreign utility companies.

Operation of UE’s Callaway nuclear plant is subject to regulation by the NRC. Its Facility Operating License expires on October 18, 2024. UE’s Osage hydroelectric plant and UE’s Taum Sauk pumped-storage hydro plant, as licensed projects under the Federal Power Act, are subject to the FERC regulations affecting, among other things, the general operation and maintenance of the projects. The license for the Osage plant expires on February 28, 2006, and the license for the Taum Sauk plant expires on June 30, 2010. In November

2004, the FERC formally accepted UE’s February 2004 license renewal application and solicited terms and conditions from the U.S. Department of Interior and various state agencies to renew the license for its Osage hydroelectric plant for an additional 50-year term. UE’s Keokuk plant and dam located in the Mississippi River between Hamilton, Illinois and Keokuk, Iowa, are operated under authority, unlimited in time, granted by an Act of Congress in 1905.

For information on regulatory matters, see Regulatory Matters in Management’s Discussion and Analysis of Financial Condition and Results of Operations under Part II, Item 7, of this report and Note 3 - Rate and Regulatory Matters to our financial statements under Part II, Item 8, of this report.

Environmental Matters

Certain of our operations are subject to federal, state, and local environmental statutes or regulations relating to the safety and health of personnel, the public, and the environment, including the identification, generation, storage, handling, transportation, disposal, record-keeping, labeling, reporting of and emergency response in connection with hazardous and toxic materials, safety and health standards, and environmental protection requirements, including stan-dards and limitations relating to the discharge of air and water pollutants. Failure to comply with those statutes or regulations could have material adverse effects on us, including the imposition of criminal or civil liability by regulatory agencies or civil fines and liability to private parties, and the required expenditure of funds to bring us into compliance. We believe that we are in material compliance with existing statutes and regulations.

For additional discussion of environmental matters, including potential NO_x,SO_2,and mercury emission reduction requirements, see Liquidity and Capital Resources in Management’s Discussion and Analysis of Financial Condition and Results of Operations under Part II, Item 7, of this report and Note 15 - Commitments and Contingencies to our financial statements under Part II, Item 8, of this report.

SUPPLY FOR ELECTRIC POWER

During 2004, the Ameren Companies’ peak demand from retail and wholesale customers was 15,991 megawatts and the peak capability to deliver power from owned generation and power supply agreements was 19,439 megawatts. Forecasted peak demand from retail and wholesale customers for 2005 is 17,441 megawatts. Ameren-owned generation and purchased power are used to meet the energy needs of our customers with a 15% reserve margin. Factors that could cause us to purchase power include, among other things, absence of sufficient owned generation, generating plant outages, extreme weather conditions, and the availability of power at a cost lower than our cost of generating it.

The acquisition of IP included IP’s rate-regulated electric and gas transmission and distribution business. IP owns no significant generation assets; it obtains almost all of the electricity that it supplies to retail customers through short-term and long-term power purchase agreements. For additional information on IP’s power purchase agreements, see Note 2 - Acquisitions to our financial statements under Part II, Item 8, of this report.

The following table presents the source of electric generation, excluding purchased power, used for the years ended December 31, 2004, 2003 and 2002:

	Coal		Nuclear		Natural Gas		Hydro		Oil
Ameren:^(a)
2004	86	%	10	%	1	%	2	%	1	%
2003	85		13		(b	)	1		1
2002	82		13		2		2		1
UE:
2004	80	%	17	%	(b	)	3	%	(b	)
2003	77		21		(b	)	2		(b	)
2002	77		20		(b	)	-		3
Genco:
2004	93	%	-		2	%	-		5	%
2003	95		-		2		-		3
2002	88		-		8		-		4
CILCORP and CILCO:^(c)
2004	99	%	-		1	%	-		(b	)
2003	100		-		(b	)	-		(b	)
2002	100		-		(b	)	-		(b	)

(a) Excludes amount for CILCORP and CILCO prior to the acquisition date of January 31, 2003; includes amounts for Ameren Registrant and non-Registrant subsidiaries and

intercompany eliminations.

(b) Less than 1% of total fuel supply.

The following table presents the cost of fuels for electric generation for the years ended December 31, 2004, 2003 and 2002:

Cost of Fuels (Dollars per million Btus)	2004		2003		2002
Ameren:^(a)
Coal	$	1.049	$	1.049	$	.999
Nuclear		.432		.410		.381
Natural gas^(b)		8.471		8.665		3.869
Weighted average-all fuels^(c)	$	1.021	$	.999	$	.974
UE:
Coal	$	.893	$	.913	$	.914
Nuclear		.432		.410		.381
Natural gas^(b)		6.960		9.328		3.407
Weighted average-all fuels^(c)	$	.823	$	.822	$	.813
Genco
Coal	$	1.328	$	1.220	$	1.255
Natural gas^(b)		8.868		8.759		3.962
Weighted average-all fuels^(c)	$	1.474	$	1.368	$	1.452
CILCORP:^(d)
Coal	$	1.288	$	1.516	$	1.610
Natural gas^(b)		8.074		6.171		3.790
Weighted average-all fuels^(c)	$	1.324	$	1.543	$	1.627
CILCO:
Coal	$	1.426	$	1.664	$	1.610
Natural gas^(b)		8.074		6.171		3.790
Weighted average-all fuels^(c)	$	1.462	$	1.690	$	1.627

(a) Excludes amounts for CILCORP and CILCO prior to the acquisition date of January 31, 2003.

(b) The fuel cost for natural gas represents the actual cost of natural gas and variable costs for transportation, storage, balancing, and fuel losses for delivery to the plant. In

addition, the fixed costs for firm transportation and firm storage capacity are included to calculate a “fully loaded” fuel cost for the generating facilities.

(c) Represents all costs for fuels utilized in our electric generating facilities, to the extent applicable, including coal, nuclear, natural gas, oil, propane, tire chips, and handling.

(d) 2002 amounts represent predecessor information. CILCORP consolidates CILCO and therefore includes CILCO amounts in its balances.

Coal

UE, Genco and CILCO have agreements in place for the purchase of coal to supply electric generating facilities through 2010. Coal supply agreements typically have an initial term of five years, with approximately 20% of the contracts expiring annually. As of December 31, 2004, almost 92% of UE’s, Genco’s and CILCO’s expected 2005 coal usage was under contract, and approximately 58% of the expected coal usage for 2006 to 2009 was under contract. Ameren burned 38 million tons of coal in 2004.

UE, Genco and CILCO have a policy of maintaining coal inventory consistent with their historical usage. Inventory levels may be adjusted because of uncertainties of supply due to potential work stoppages, delays in coal deliveries, equipment breakdowns, and other factors. The following table presents the number of days supply of coal in inventory as of December 31, 2004 and 2003:

	2004	2003
Ameren	55	56
UE	64	59
Genco	48	55
CILCORPand CILCO	15	38

Nuclear

UE has agreements or inventories to fulfill its Callaway nuclear plant needs for uranium and conversion, enrichment and fabrication services through 2006. UE expects to enter into additional contracts from time to time in order to supply nuclear fuel. UE is a member of Fuelco, which provides benefits to UE and Fuelco’s other members in all aspects of the nuclear fuel cycle. UE is able to combine its fuel needs with the other members, and thereby increase its purchasing power and the opportunities for volume discount pricing. In addition, Fuelco is able to pursue sources of supply that would not otherwise be available to UE alone. Diversification of supply is enhanced and security of supply is better managed collectively. In fuel fabrication, UE is able to draw upon the expertise of the other members to enhance fuel performance. The Callaway nuclear plant normally requires refueling at 18-month intervals. The last refueling took place in May and June 2004; the next refueling is scheduled for September 2005.

Natural Gas Supply for Power Generation

Our natural gas procurement strategy is designed to ensure reliable and immediate delivery of natural gas to our generating units. We do this by optimizing transportation and storage options; by minimizing cost and price risk through various supply and price hedging agreements that allow us to maintain access to multiple gas pools, supply basins, and storage; and by reducing the impact of price volatility. For 2005, 96% of the estimated required natural gas supply for generation was under contract; 35% of the required gas supply was hedged for price risk as of December 31, 2004.

Purchased Power

We believe that we can obtain enough purchased power to meet future needs. However, during periods of high demand, the price and availability of purchased power may be significantly affected. The Ameren transmission system has a minimum of 18 direct connections to other control areas, which allow access to numerous sources of supply. UE, CIPS, CILCO and IP are members of the MISO. Effective April 1, 2005, the MISO is expected to begin operating a newly designed market that is expected to offer improved transparency of power pricing and efficiency in generation dispatch.

Through the end of 2006, CIPS, CILCO and IP have contracts in place to supply almost all of their power needs. For a description of IP’s primary power supply contract with Dynegy and a description of CIPS’ and CILCO’s power supply contracts with affiliates, see Note 2 - Acquisitions and Note 14 - Related Party Transactions to our financial statements under Part II, Item 8, of this report.

On December 31, 2006, the current Illinois electric rate freeze expires, as do the supply contracts for generation to serve the power requirements of CIPS, CILCO and IP. Prior to December 31, 2006, determinations must be made as to how all Illinois electric distribution companies will procure their generation needs and how they will set future rates for the generation components and delivery service components of customer rates.

During 2004, the ICC held workshops to get input from interested parties on the framework to be used for retail electric rate determination and generation procurement after the current Illinois electric rate freeze and supply contracts expire on December 31, 2006. A report issued by the ICC in late 2004, outlined a process that received strong support in the workshops: It would have CIPS, CILCO and IP procure power through an auction monitored by the ICC. The form of power supply would meet the full requirements of the utility, and the risk of fluctuations in power requirements would be borne by the supplier. In addition, the report noted that many stakeholders, including Ameren, supported a process whereby the price of power resulting from the auction would be the price used to determine the generation component of customer rates. This price of power would be charged to customers by a pass-through mechanism. With regard to the delivery service component of customer rates, it is expected that all Illinois delivery service companies will file rate cases, at which time the delivery service component of customer rates will be updated. Genco and AERG would probably participate in the auction, but there may be a limit imposed by the ICC on the maximum amount of power they could supply CIPS, CILCO and IP. In February 2005, CIPS, CILCO and IP filed with the ICC: A proposed format for the generation procurement auction, a rate mechanism to pass generation costs through to customers, and a process to update the delivery service portion of rates, among other things. These proposals are subject to review and approval by the ICC within 11 months of the filings. In addition, the Illinois legislature began hearings in February 2005 regarding the framework for retail rate determination and generation procurement. We cannot predict what actions, if any, the Illinois legislature will take, or whether the ICC will approve our proposals for generation procurement or electric rate determination.

NATURAL GAS SUPPLY FOR DISTRIBUTION

UE, CIPS, CILCO and IP are responsible for the purchase and delivery of natural gas to their gas utility customers. UE, CIPS, CILCO and IP develop and manage a portfolio of gas supply resources, including firm gas supply under term agreements with producers, interstate and intrastate firm transportation capacity, firm storage capacity leased from interstate pipelines, and on-system storage facilities to maintain gas deliveries to our customers throughout the year and especially during periods of peak demand. UE, CIPS, CILCO and IP primarily use the Panhandle Eastern Pipe Line Company, Trunkline Gas Company, Natural Gas Pipeline Company of America, Mississippi River Transmission Corporation, and Texas Eastern Transmission Corporation interstate pipeline systems for transportation of natural gas to our systems. In addition to physical transactions, financial instruments, including the NYMEX futures market and OTC financial markets are used to hedge the price paid for natural gas. Prudently incurred natural gas purchase costs are passed on to UE, CIPS, CILCO and IP gas customers in Illinois and Missouri dollar-for-dollar under PGA clauses, subject to review by the ICC and the MoPSC.

For additional information on our fuel and purchased power supply, see Results of Operations, Liquidity and Capital Resources and Effects of Inflation, and Changing Prices under Management’s Discussion and Analysis of Financial Condition and Results of Operations under Part II, Item 7, of this report, Quantitative and Qualitative Disclosures About Market Risk under Part II, Item 7A, of this report, and Note 1 - Summary of Significant Accounting Policies, Note 9 - Derivative Financial Instruments, Note 14 - Related Party Transactions, Note 15 - Commitments and Contingencies, and Note 16 - Callaway Nuclear Plant to our financial statements under Part II, Item 8, of this report.

INDUSTRY ISSUES

We are facing issues common to the electric and gas utility industry. These issues include:

·	the potential for more intense competition in generation and supply;

·	the potential for changes in the structure of regulation;

·	changes in the structure of the industry as a result of changes in federal and state laws, including the

formation of non-rate-regulated generating entities and regional transmission organizations;

·	fluctuations in power prices due to the balance of supply and demand and commodity prices;

·	continually developing and complex environmental laws, regulations and issues, including proposed new air-quality standards;

·	public concern about the siting of new facilities;

·	construction of new power generating facilities;

·	proposals for programs to encourage energy efficiency and renewable sources of power;

·	public concerns about nuclear plant operation and decommissioning and the disposal of nuclear waste;

·	consolidation of electric and gas companies; and

·	global climate issues.

We are monitoring these issues. We are unable to predict at this time what impact, if any, these issues will have on our results of operations, financial position, or liquidity. For additional information, see Outlook and Regulatory Matters in Management’s Discussion and Analysis of Financial Condition and Results of Operations under Part II, Item 7, of this report and Note 3 - Rate and Regulatory Matters and Note 15 - Commitments and Contingencies to our financial statements under Part II, Item 8, of this report.

RISK FACTORS

Ameren may not be able to integrate IP successfully into its other businesses or achieve the benefits it anticipates.

Ameren cannot ensure that it will be able to integrate IP successfully with its other businesses. The integration of IP with its other businesses will present significant challenges; Ameren may not be able to operate the combined company as effectively as expected. Ameren may also fail to achieve the anticipated benefits of the acquisition as quickly or as cost- effectively as anticipated; it may not be able to achieve those benefits at all. Ameren expects that this acquisition will be accretive to earnings per share in the first two years. This expectation is based on important assumptions, which may be incorrect, including assumptions related to expected financing arrangements, regulatory treatment, interest rates, market prices for power, and synergies. As a result, if Ameren is unable to integrate its businesses effectively or to achieve the benefits anticipated, its results of operations, financial position, and liquidity may be materially adversely affected.

The electric and gas rates that certain Ameren Companies are allowed to charge in Missouri and Illinois are largely set through 2006. These “rate freezes,” along with other actions of regulators that can significantly affect our earnings, liquidity, and business activities, are largely outside our control.

The rates that certain Ameren Companies are allowed to charge for their services are the single most important item influencing the results of operations, financial position, and liquidity of the Ameren Companies. Our industry is highly regulated. The regulation of the rates that we charge our customers is determined, in large part, by governmental organizations outside of our control, including the MoPSC, the ICC, and the FERC. We are also subject to regulation by the SEC under the PUHCA. Decisions made by these regulators could have a material impact on our results of operations, financial position, and liquidity.

As a part of the settlement of UE’s Missouri electric rate case in 2002, UE is subject to a rate moratorium that prohibits changes in its electric rates in Missouri before July 1, 2006, subject to limited statutory and other exceptions. In addition, a provision of the Illinois legislation related to the restructuring of the Illinois electric industry put a rate freeze into effect in Illinois until January 1, 2007, for UE, CIPS, CILCO and IP. This Illinois legislation also requires that 50% of the earnings from each respective Illinois jurisdiction in excess of certain levels be refunded to UE’s, CIPS’, CILCO’s and IP’s Illinois customers through 2006. Furthermore, as part of the settlement of UE’s Missouri gas rate case, which was approved by the MoPSC on January 13, 2004, UE agreed to a rate moratorium. It will make no changes in its gas delivery rates prior to July 1, 2006, subject to certain exceptions. Also, in the order approving Ameren’s acquisition of IP, the ICC prohibited IP from filing for any proposed increase in gas delivery rates to be effective prior to January 1, 2007, beyond IP’s pending request for a gas delivery rate increase. The ICC conducted workshops seeking input from interested parties on the framework to be used for retail rate determination and for generation procurement by customers after the current Illinois rate freeze and supply contracts end in 2006.

As a part of the settlement of UE’s Missouri electric rate case in 2002, UE also undertook to use commercially reasonable efforts to make critical energy infrastructure investments of $2.25 billion to $2.75 billion from January 1, 2002 through June 30, 2006, for among other things, the addition of more than 700 megawatts of new generation capacity. UE added 240 megawatts of CTs in 2002. UE is also seeking to acquire 550 megawatts of CTs from Genco in 2005. Ameren also committed IP to make between $275 million and $325 million in energy infrastructure investments over its first two years of ownership, in conjunction with the ICC’s approval of Ameren’s acquisition of IP. UE’s agreement to a rate moratorium in Missouri and UE’s, CIPS’, CILCO’s and IP’s rate freezes mean that capital expenditures will not become recoverable in rates, and will not earn a return, before July 1, 2006, for UE and January 1, 2007, for CIPS, CILCO and IP. Therefore, undertakings with respect to energy infrastructure investments and funding new programs, coupled with the rate reductions and rate moratoriums, could result in increased financing requirements for UE, CIPS, CILCO and IP and thus have a material impact on our results of operations, financial position, and liquidity.

The Ameren Companies do not have in either Missouri or Illinois a fuel adjustment clause for their electric operations that would allow them to recover from customers costs for purchased power or increased fuel used for generation. Therefore, to the extent that we have not hedged our fuel and power costs, we are exposed to changes in fuel and power prices to the extent that fuel for our electric generating facilities and power must be purchased on the open market in order for us to serve our customers.

Steps taken and being considered at the federal and state levels continue to change the structure of the electric industry and utility regulation. At the federal level, the FERC has been mandating changes in the regulatory framework for transmission-owning public utilities such as UE, CIPS, CILCO and IP. In Missouri, restructuring bills have been introduced in the past, but no legislation has been passed. In Illinois, which since the acquisition of IP, supplies over 50% of Ameren’s electric revenues, the Illinois Customer Choice Law provides for electric utility restructuring and retail competition.

Principally because of rate reductions and rate moratoriums that affect certain Ameren Companies, increased costs and investments have resulted in decreased returns in our distribution utility businesses. In 2005, Ameren will begin the process for preparing and filing proposals for utility rate adjustments in Illinois and Missouri to take effect after the expiration of the applicable rate moratoriums.

We are not able to predict what rate treatment certain Ameren Companies will receive after the rate moratoriums expire in Missouri and Illinois. There are currently activities under way in Illinois to determine the framework for retail electric rate determination and generation procurement after the current Illinois electric rate freeze and supply contracts expire in 2006. See Note 3 - Rate and Regulatory Matters to our financial statements under Part II, Item 8, of this report. In response to competitive, economic, political, legislative and regulatory pressures, we may be subject to further rate moratoriums, rate refunds, or rate reductions, any and all of which could have a significant adverse affect on our results of operations, financial position, and liquidity.

Increased federal and state environmental regulation could require UE, Genco and CILCO to incur large capital expenditures and increase operating costs.

Approximately 65% of Ameren’s generating capacity is coal-fired. The balance is nuclear, gas-fired, hydro, and oil-fired. The EPA issued proposed regulations with respect to SO₂, NO_x, and mercury emissions from coal-fired power plants. These new rules, if adopted, would require significant additional reductions in these emissions from our power plants in phases, beginning in 2010. The EPA has delayed finalization of the proposed rules so that Congress may first consider the Bush Administration’s Clear Skies legislation. The Clear Skies legislation calls for roughly 70% cuts in NO_x, SO₂, and mercury emissions, phased in through 2018. Clear Skies legislation will probably be introduced in the U.S. Congress and debated in 2005. Preliminary estimates of capital costs, based on Ameren systems’ current technology, to comply with the EPA proposed SO₂, NO_x, and mercury emission regulations, range from $1.4 billion to $1.9 billion by 2015.

Future initiatives regarding greenhouse gas emissions and global warming continue to be the subject of much debate. Coal-fired power plants are significant sources of carbon dioxide emissions, a principal greenhouse gas. The related Kyoto Protocol was signed by the United States, but it has since been rejected by the president, who instead has asked for an 18% voluntary decrease in carbon intensity. In response to the administration’s request, six electric power sector trade associations, including the Edison Electric Institute, of which Ameren is a member, and the Tennessee Valley Authority (TVA), signed a Memorandum of Understanding (MOU) with the DOE in December 2004 calling for a 3% - - 5% decrease in carbon intensity from the utility sector between 2002 and 2012 on a voluntary basis. Currently, Ameren is considering various initiatives to comply with the MOU. These include enhanced generation at our nuclear and hydro power plants, increased efficiency measures at our coal-fired units, and investing in renewable energy and carbon sequestration projects.

We are unable to predict the ultimate effect of any new environmental regulations, voluntary compliance guidelines, enforcement initiatives ,or legislation on our results of operations, financial position, or liquidity. Any of these factors would add significant pollution control expenditures and operating costs to UE’s, Genco’s and CILCO’s generating assets and, therefore, could also increase financing requirements for some Ameren Companies. Although costs incurred by UE would be eligible for recovery in rates over time, subject to the MoPSC or the ICC approval in a rate proceeding, as applicable, there is no similar mechanism for recovery of costs by Genco or CILCO in Illinois.

UE’s, CIPS’, CILCO’s and IP’s participation in the MISO could increase costs, reduce revenues, and reduce UE’s, CIPS’, CILCO’s and IP’s control over their transmission assets. Genco could also incur increased costs or reduced revenues as a result of participation in the MISO Day Two Markets.

On May 1, 2004, functional control of the UE and CIPS transmission systems was transferred to the MISO through GridAmerica LLC. On September 30, 2004, IP transferred functional control of its transmission system to the MISO. CILCO had transferred functional control of its transmission system to the MISO before the acquisition. The participation by UE, CIPS and IP in the MISO is expected to increase annual costs by $10 million to $25 million in the aggregate because the companies will be subject to the MISO’s administrative costs. This could also result in a decrease in annual revenues of $5 million to $15 million in the aggregate,

because of the MISO’s method of allocating transmission revenues. UE, CIPS, CILCO and IP may also be required to expand their transmission systems according to decisions made by MISO rather than according to their internal planning process. See Note 3 - Rate and Regulatory Matters to our financial statements under Part II, Item 8, of this report.

In July 2002, the FERC issued its standard market design NOPR. The NOPR proposed three important of changes to the way the current wholesale transmission service and energy markets are operated: the placement of all jurisdictional transmission facilities under the control of an independent transmission provider (similar to the MISO); a new transmission service tariff that would provide a single form of transmission service for all users of the transmission system, including bundled retail load; and a new transmission management system. This new design would use market-based pricing to compensate market participants for power, as well as for transmission congestion and losses. The current system requires generators to make advance reservations for transmission service.

In April 2003, the FERC issued a white paper reflecting comments received in response to the NOPR. The white paper indicated that the FERC will not assert jurisdiction over the transmission rate component of bundled retail service. The FERC will ensure in its final rule that existing bundled retail customers retain their existing transmission rights and their rights for future load growth in its final rule. Moreover, the white paper acknowledged that the final rule will provide the states with input on resource adequacy requirements, allocation of firm transmission rights, and transmission planning. The FERC also requested input on the flexibility and timing of the final rule’s implementation. We believe that the proposed NOPR could have a negative impact on the cost and reliability of service to retail customers. It could lead to trapped transmission costs that might not be recoverable from ratepayers as a result of inconsistent regulatory policies.

Although issuance of the final rule is uncertain and its implementation schedule unknown, the MISO is implementing a separate market design similar to the market design proposed by the NOPR. This new market design is referred to as the MISO Day Two Market. The MISO Day Two Market, scheduled to begin operation on April 1, 2005, is designed to result in improved transparency of power pricing and efficiency in generation dispatch. Since this is a new and complex market, there could be significant initial price volatility. Ultimately, price transparency and dispatch efficiency could result in lower prices on market-based power sales by UE, Genco, AERG and CILCO to their customers. In addition, the movement of power could result in unanticipated transmission congestion charges or credits. MISO has allocated FTRs to UE, CIPS, Genco, and CILCO. FTRs are financial instruments that are intended to hedge this risk, but UE, CIPS, Genco, CILCO and IP may not have been allocated the appropriate number of these FTRs. In addition, these instruments could prove ineffective in hedging risk.

Until we achieve some degree of operational experience participating in the MISO, including the MISO Day Two Market, we are unable to predict the impact that the MISO participation or ongoing RTO developments at the FERC or other regulatory authorities will have on our results of operations, financial position, or liquidity.

The market-based rate authority currently held by UE, CIPS, Genco, CILCO, AERG, Development Company, Marketing Company, and Medina Valley could be revoked or restricted as a result of the FERC’s new market power analysis screen order.

In an order issued in April 2004, the FERC replaced the Supply Margin Assessment Screen previously used to review applications by sellers of electricity at wholesale for authorization to sell power at market-based rates. The new screen uses two measures of market power: (1) a pivotal supplier analysis, and (2) a market share analysis, which is to be prepared on a seasonal basis. Applicants located in a RTO with sufficient market structure and a single energy market were permitted to base their calculations of market power on the size of the market in the geographic region under the control of the RTO, but other applicants were required to base their calculations of market power on the size of the market in the control area where they operate. If the applicant passes both screens, a rebuttable presumption will exist that it lacks generation market power. If the applicant fails either screen, a rebuttable presumption will exist that it has market power. Under such circumstances, the applicant may either seek to rebut the presumption by preparing a delivered price test (identifying the amount of economic capacity from neighboring areas that can be delivered to the control area) or propose mitigation measures. Unless some other mitigation measure is adopted, the applicant’s authority to sell power at market-based rates in areas where it has market power will be revoked, and the applicant will be required to sell at cost-based rates in those areas.

UE, CIPS, Genco, CILCO, AERG, Development Company, Marketing Company, and Medina Valley are currently authorized by the FERC to continue to sell power at market-based rates. However, the FERC indicated in its April 2004 order that it would apply the new market analysis screens to pending and future market-based rate applications, including three-year market-based rate reviews. All of the aforementioned Ameren entities currently have three-year market-based rate reviews pending at the FERC.

As required, these Ameren companies filed an updated market power analysis with the FERC in December 2004. All of the Ameren companies pass both screen measures for the market consisting of the entire MISO footprint. Also in their December filings, these Ameren companies offered to supplement their filings with information that applies the new

tests to smaller markets consisting of the control areas in which the Ameren companies sell power, if the MISO Day Two Markets does not begin on March 1, 2005, as originally scheduled. In January 2005, the Missouri Joint Municipal Electric Utility Commission (MJMEUC) filed a protest to the Ameren companies’ December filing. In February 2005, the Ameren companies filed a response to the MJMEUC’s protest, which rebutted its claims that the Ameren companies possess market power.

We are unable to anticipate how or when the FERC will respond to our December filings and to any supplemental filings that we might make.

Increasing costs associated with our defined benefit retirement plans, health care plans, and other employee- related benefits may adversely affect our results of operations, financial position, and liquidity.

We have defined benefit and postretirement plans that cover substantially all of our employees. Assumptions related to future costs, returns on investments, interest rates, and other actuarial assumptions have a significant impact on our earnings and funding requirements. Assuming that we continue to receive federal interest rate relief beyond 2005, we do not expect contributions to our defined benefit plans to be required until 2008 and 2009, when an aggregate $400 million is expected to be paid. This amount is an estimate; it may change because of actual stock market performance, changes in interest rates, or any pertinent changes in government regulations, any of which could also result in a requirement to record an additional minimum pension liability.

In addition to the costs of our retirement plans, the costs of providing health care benefits to our employees and retirees have increased substantially in recent years. We believe that our employee benefit costs, including costs related to health care plans for our employees and former employees, will continue to rise. The increasing costs and funding requirements associated with our defined benefit retirement plans, health care plans, and other employee benefits may adversely affect our results of operations, financial position, or liquidity.

UE’s, Genco’s, CILCO’s, AERG’s, Medina Valley’s and EEI’s electric generating facilities are subject to operational risks that could result in unscheduled plant outages, unanticipated operation and maintenance expenses, and increased purchased power costs.

UE, Genco, CILCO, AERG, Medina Valley, and EEI own and operate coal, nuclear, gas-fired, hydro, and oil-fired generating facilities. Operation of electric generating facilities involves certain risks that can adversely affect energy output and efficiency levels. Included among these risks are:

·	increased prices for fuel and fuel transportation as existing contracts expire;

·	facility shutdowns due to a failure of equipment or processes or operator error;

·	longer-than-anticipated maintenance outages;

·	disruptions in the delivery of fuel and lack of adequate inventories;

·	labor disputes;

·	inability to comply with regulatory or permit requirements;

·	disruptions in the delivery of electricity;

·	increased capital expenditures requirements, including those due to environmental regulation; and

·	unusual or adverse weather conditions, including catastrophic events such as fires, explosions, floods or other similar occurrences affecting electric generating facilities.

A substantial portion of Genco’s and CILCO’s generating capacity is committed under affiliate contracts that expire at the end of 2006. Upon expiration of these contracts, Genco’s and CILCO’s electric generating facilities must compete for the sale of energy and capacity, which exposes them to price risk.

Genco and CILCO, through AERG, own 4,751 megawatts and 1,165 megawatts, respectively, of non-rate-regulated electric generating facilities. Of these non-rate-regulated electric generating facilities, approximately 3,300 megawatts are currently under full-requirements contracts with our affiliates. The remainder of the generating capacity must compete for the sale of energy and capacity.

To the extent electric capacity generated by these facilities is not under contract to be sold, the revenues and results of operations of these non-rate-regulated subsidiaries will generally depend on the prices that they can obtain for energy and capacity in Illinois and adjacent markets. Among the factors that could influence such prices (all of which are beyond our control to a significant degree) are:

·	the current and future market prices for natural gas, fuel oil, and coal;

·	current and forward prices for the sale of electricity;

·	the extent of additional supplies of electric energy from current competitors or new market entrants;

·	the pace of deregulation in our market area and the expansion of deregulated markets;

·	the regulatory and pricing structures developed for Midwest energy markets as they continue to evolve and the pace of development of regional markets for energy and capacity outside of bilateral contracts;

·	future pricing for, and availability of, transmission services on transmission systems, and the effect of RTOs and export energy transmission constraints, which could limit the ability to sell energy in markets adjacent to Illinois;

·	the rate of growth in electricity usage as a result of population changes, regional economic conditions, and the implementation of conservation programs; and

·	climate conditions prevailing in the Midwest market.

In a report issued by the ICC in late 2004, a process was outlined that would have CIPS, CILCO and IP procuring power through an auction monitored by the ICC after the current Illinois rate freeze and supply contracts end in 2006. Genco and AERG would probably participate in this auction, but there might be a limit on the maximum amount of power they could supply to Ameren’s Illinois utilities. See Note 3 - Rate and Regulatory Matters to our financial statements under Part II, Item 8, of this report.

Genco and UE have signed an agreement to dispatch their generating facilities jointly, which produces benefits and efficiencies for both generating parties. Pending or future federal and state regulatory proceedings and policies may evolve in ways that could affect Genco’s ability to participate in these affiliate transactions on current terms. For example, as a result of the MoPSC order approving the transfer of UE’s Illinois-based utility business to CIPS, certain terms of the joint dispatch agreement were ordered to be modified; this could result in margins from interchange sales of $7 million to $24 million being transferred from Genco to UE. See Note 3 - Rate and Regulatory Matters to our financial statements under Part II, Item 8, of this report for a more detailed description of these modifications. The termination of the joint dispatch agreement, or modifications to it, could have a material adverse effect on UE or Genco.

UE’s ownership and operation of a nuclear generating facility creates business, financial, and waste disposal risks.

UE owns the Callaway nuclear plant, which represents approximately 14% of UE’s generation capacity. Therefore, UE is subject to the risks of nuclear generation, which include the following:

·	potential harmful effects on the environment and human health resulting from the operation of nuclear facilities and the storage, handling and disposal of radioactive materials;

·	limitations on the amounts and types of insurance commercially available to cover losses that might arise in connection with UE’s nuclear operations or those of others in the United States;

·	uncertainties with respect to contingencies and assessment amounts if insurance coverage is inadequate;

·	increased public and governmental concerns over the adequacy of security at nuclear power plants;

·	uncertainties with respect to the technological and financial aspects of decommissioning nuclear plants at the end of their licensed lives (UE’s facility operating license for the Callaway nuclear plant expires in 2024); and

·	costly and extended outages for scheduled or unscheduled maintenance.

The NRC has broad authority under federal law to impose licensing and safety requirements for the operation of nuclear generation facilities. In the event of non-compliance, the NRC has the authority to impose fines, shut down a unit, or both, depending upon its assessment of the severity of the situation, until compliance is achieved. Revised safety requirements promulgated by the NRC could necessitate substantial capital expenditures at nuclear plants such as UE’s. In addition, although UE has no reason to anticipate a serious nuclear incident at its plant, if an incident did occur, it could harm UE’s results of operations, financial position, or liquidity. A major incident at a nuclear facility anywhere in the world could cause the NRC to limit or prohibit the operation or licensing of any domestic nuclear unit.

Operating performance at UE’s Callaway nuclear plant has resulted in unscheduled or extended outages including the extension of Callaway’s scheduled refueling and maintenance outage in 2004. In addition, Ameren and UE incurred significant unanticipated replacement power and maintenance costs. As a result, the operating performance at UE’s Callaway nuclear plant has declined in comparison with both its past operating performance and the operating performance of other nuclear plants in the U.S. Ameren and UE are actively working to address the factors that led to the decline in Callaway’s operating performance. They are reviewing management and supervision of operating personnel, equipment reliability, maintenance worker practices, engineering performance, and overall organizational effectiveness. However, Ameren and UE cannot predict whether such efforts will result in an overall improvement of operations at Callaway. Any actions taken are expected to result in incremental operating costs at Callaway. Further, additional unscheduled or extended outages at Callaway could have a material adverse effect on the results of operations, financial position, and liquidity of Ameren and UE.

Our energy risk management strategies may not be effective in managing fuel and electricity pricing risks, which could result in unanticipated liabilities or increased volatility in our earnings.

We are exposed to changes in market prices for natural gas, fuel, electricity, and emission credits. Prices for natural gas, fuel, electricity, and emission credits may fluctuate substantially over relatively short periods of time and expose us to commodity price risk. We use long-term purchase and sales contracts in addition to derivatives such as forward contracts, futures contracts, options, and swaps to manage these risks. We attempt to manage our risk associated with these activities through enforcement of established risk limits and risk management procedures. We cannot assure you that these strategies will be successful in managing our pricing

risk, or that they will not result in net liabilities to us as a result of future volatility in these markets.

Although we routinely enter into contracts to hedge our exposure to the risks of demand, market effects of weather, and changes in commodity prices, we do not always hedge the entire exposure of our operations from commodity price volatility. Furthermore, our ability to hedge our exposure to commodity price volatility depends on liquid commodity markets. As a result, to the extent the commodity markets are illiquid, we may not be able to execute our risk management strategies, which could result in greater unhedged positions than we would prefer at a given time. To the extent that unhedged positions exist, fluctuating commodity prices can adversely affect our results of operations, financial position, and liquidity.

Our counterparties may not meet their obligations to us.

We are exposed to risk that counterparties who owe us money, energy or other commodities or services will not be able to perform their obligations. Should the counterparties to these arrangements (which include agreements for a subsidiary of Dynegy and others to supply electricity to IP during 2005 and 2006) fail to perform, IP might be forced to replace the underlying commitment at then-current market prices. In such event, we might incur losses in addition to the amounts, if any, already paid to the counterparties.

Our facilities are considered critical infrastructure and may be targets for acts of terrorism.

Like other electric and gas utilities, our power generation plants, fuel storage facilities, and transmission and distribution facilities may be targets of terrorist activities that could result in disruption of our ability to produce or distribute some portion of our energy products. Any such disruption could result in a significant decrease in revenues or significant additional costs to repair, which could have a material adverse effect on our results of operations, financial position, and liquidity.

Our businesses are dependent on our ability to access the capital markets successfully. We may not have access to sufficient capital in the amounts and at the times needed.

We use short-term and long-term capital markets as a significant source of liquidity and funding for capital requirements, including those related to future environmental compliance, not satisfied by our operating cash flows. The inability to raise capital on favorable terms, particularly during times of uncertainty in the capital markets, could negatively impact our ability to maintain and expand our businesses. Based on our current credit ratings, we believe that we will continue to have access to the capital markets. However, events beyond our control may create uncertainty in the capital markets that could increase our cost of capital or impair our ability to access the capital markets.

OPERATING STATISTICS

The following tables present key electric and natural gas operating statistics for Ameren for the last three years. CILCORP and CILCO are included only for the periods after January 31, 2003. IP is included for the period after September 30, 2004.

Electric Operating Statistics - Year Ended December 31,	2004		2003		2002
Electric operating revenues (millions)
Residential	$	1,323	$	1,247	$	1,202
Commercial		1,239		1,152		1,024
Industrial		774		710		511
Wholesale		335		295		291
Other		33		26		23
Native		3,704		3,430		3,051
Interchange		366		295		200
EEI		97		134		185
Miscellaneous		121		93		84
Total electric operating revenues	$	4,288	$	3,952	$	3,520
Kilowatthour sales (millions)
Residential		19,121		17,673		16,704
Commercial		20,863		19,248		17,224
Industrial		18,814		17,259		12,442
Wholesale		9,388		8,770		8,936
Other		421		308		280
Native		68,607		63,258		55,586
Interchange		10,840		9,268		8,165
EEI		4,118		5,255		6,588
Total kilowatthour sales		83,565		77,781		70,339
Residential revenue per kilowatthour (average)		6.92¢		7.06¢		7.26¢

Electric Operating Statistics - Year Ended December 31,		2004			2003			2002
Capability at time of peak, including net purchases and sales (megawatts)
UE		9,243			9,022			9,765
Genco		4,603			4,429			4,223
CILCO		1,380			1,355			-
IP		3,878^(a)	⁾⁽		-			-
EEI		676(b)	⁾		601			601
Generating capability at time of peak (megawatts)
UE		8,351			8,298			8,647
Genco		4,239			4,452			4,327
CILCO		1,230			1,230			-
EEI		801			601			601
Price per ton of coal (average)	$	19.65		$	19.36		$	18.06
Source of energy supply
Fossil		77.4	%		77.5	%		74.3	%
Nuclear		9.0			11.9			12.4
Hydro		1.6			0.9			1.7
Purchased and interchanged, net		12.0			9.7			11.6
		100.0	%		100.0	%		100.0	%

(a)	Represents capability throughout 2004, including the fourth quarter.

(b)	Excludes 125 megawatts of IP’s ownership in EEI that IP agreed to sell to a nonaffiliate as part of its acquisition settlement with the FERC.

Gas Operating Statistics - Year Ended December 31,	2004			2003				2002
Natural gas operating revenues (millions)
Residential	$	506		$	343		$	192
Commercial		198			142			75
Industrial		121			123			37
Off-system sales		3			6			4
Other		38			34			7
Total natural gas operating revenues	$	866		$	648		$	315
MMBtu sales (millions of MMBtus)
Residential		49			35			21
Commercial		21			16			9
Industrial		18			20			8
Off-system sales		-			1			1
Total MMBtu sales (millions of MMBtus)		88			72			39
Peak day throughput (thousands of MMBtus)
UE		182			188			159
CIPS		272			282			232
CILCO		412			301^(a)	⁾		-
IP		541^(b)	⁾		-			-
Total peak day throughput		1,407			771			391

(a)	Represents peak day throughput since the acquisition date of January 31, 2003. CILCO’s peak day throughput in January 2003 was 404 MMBtus.

(b)	Represents peak day throughput since the acquisition date of September 30, 2004. IP’s peak day throughput for the first three quarters of 2004 was 654 MMBtus.

AVAILABLE INFORMATION

The Ameren Companies make available free of charge through Ameren’s Internet Web site (http://www.ameren.com) their annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and any amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act as soon as reasonably practicable after such reports are electronically filed with, or furnished to, the SEC.

The Ameren Companies also make available free of charge through Ameren’s Web site (http://www.ameren.com) the charters of Ameren’s board of directors’ audit committee, human resources committee, nominating and corporate governance committee, and nuclear oversight committee and the corporate governance guidelines, shareholder communications policy, and director nomination policy which apply to the Ameren Companies. These documents are also available in print upon written request to Ameren Corporation, Attention: Secretary, P.O. Box 66149, St. Louis, Missouri 63166-6149.

ITEM 2. PROPERTIES.

For information on our principal properties, including planned additions, replacements and transfers, see the generating facilities table below and Liquidity and Capital Resources and Regulatory Matters in Manage-ment’s Discussion and Analysis of Financial Condition and Results of Operations under Part II, Item 7, of this report. See also Note 3 - Rate and Regulatory Matters, Note 6 - Long-term Debt and Equity Financings and Note 15 - Commitments and Contingencies to our financial statements under Part II, Item 8, of this report.

Ameren is a member of MAIN, a regional electric reliability council organized to coordinate the planning and operation of bulk power supply in Illinois and portions of Michigan, Wisconsin, Iowa, Minnesota and Missouri. The Ameren membership covers UE, CIPS, CILCO and IP. Ameren has provided formal written notice to the MAIN board of directors of its intent to withdraw from MAIN effective January 1, 2006, provided the configuration of MAIN remains the same. Ameren intends to join another RRO prior to its withdrawal from MAIN. Ameren may cancel its notice of intent to withdraw from MAIN at any time. Until the withdrawal is effective, Ameren will continue to honor all of its obligations as a member of MAIN. Before Ameren acquired it, IP gave notice to MAIN of its intent to withdraw effective December 31, 2004. However, as a result of Ameren’s acquisition of it, IP remains a member of MAIN through the Ameren membership.

The bulk power system of UE, CIPS and Genco is operated as an Ameren-wide control area and transmission system under the FERC-approved joint dispatch agreement. The joint dispatch agreement provides a way for UE and Genco to participate in the coordinated operation of CIPS’ and UE’s transmission facilities. This allows UE and Genco to achieve economies consistent with the provision of reliable electric service and an equitable sharing of the benefits and costs of that coordinated operation. See Note 14 - Related Party Transactions to our financial statements under Part II, Item 8, of this report for a discussion of changes to the joint dispatch agreement that may arise out of a February 2005 MoPSC order. In 2004, we had a minimum of 18 direct connections with other control areas for the exchange of electric energy, directly and through the facilities of others. CILCO continues to operate as a separate control area, so CILCO’s generating plants, including those of its subsidiary, AERG, have not been jointly dispatched with the generating plants owned by UE and Genco. UE, CIPS, CILCO and IP are transmission-owning members of the MISO, and they have transferred functional control of their systems to the MISO. Transmission service on the UE, CIPS, CILCO and IP transmission systems are provided pursuant to the terms of the MISO OATT on file with the FERC. See Note 3 - Rate and Regulatory Matters to our financial statements under Part II, Item 8, of this report for further information.

The following table presents information with respect to our electric generating facilities and capability at the time of our expected 2005 peak summer electrical demand:

Primary Fuel Source	Plant	Location	Net Kilowatt Capability^(a)	Net Heat Rate^(b)
UE:
Coal	Labadie	Franklin County, Mo.	2,415,000	9,667
	Rush Island	Jefferson County, Mo.	1,208,000	10,331
	Sioux	St. Charles County, Mo.	994,000	9,786
	Meramec	St. Louis County, Mo.	858,000	11,583
Total coal			5,475,000
Nuclear	Callaway	Callaway County, Mo.	1,147,000	10,361
Hydro	Osage	Lakeside, Mo.	226,000	n/a
	Keokuk	Keokuk, Iowa	134,000	n/a
Total hydro			360,000
Pumped-storage	Taum Sauk	Reynolds County, Mo.	440,000	n/a
Oil (CTs)	Fairgrounds	Jefferson City, Mo.	55,000	10,878
	Meramec	St. Louis County, Mo.	55,000	10,656
	Mexico	Mexico, Mo.	55,000	10,767
	Moberly	Moberly, Mo.	55,000	11,100
	Moreau	Jefferson City, Mo.	55,000	10,878
	Howard Bend	St. Louis County, Mo.	43,000	11,899
	Venice	Venice, Ill.	26,000	14,191
Total oil			344,000
Natural gas (CTs)	Peno Creek^(c)	Bowling Green, Mo.	188,000	10,761
	Meramec	St. Louis County, Mo.	53,000	12,031
	Venice^(d)	Venice, Ill.	49,000	10,756
	Venice^(e)	Venice, Ill.	330,000	10,599
	Viaduct	Cape Giradeau, Mo.	26,000	17,925
	Kirksville	Kirksville, Mo.	13,000	22,573
Total natural gas			659,000
Total UE			8,425,000^(f)


Primary Fuel Source	Plant	Location	Net Kilowatt Capability^(a)	Net Heat Rate^(b)
EEI:
Coal	Joppa Generating Station	Joppa, Ill.	800,000	10,490
Natural gas (CTs)	Joppa	Joppa, Ill.	35,200	10,757
Total EEI			835,200^(g)
Genco:
Coal	Newton	Newton, Ill.	1,126,000	10,478
	Coffeen	Coffeen, Ill.	900,000	9,798
	Meredosia	Meredosia, Ill.	327,000	11,973
	Hutsonville	Hutsonville, Ill.	153,000	10,381
Total coal			2,506,000
Oil	Meredosia	Meredosia, Ill.	186,000	10,914
	Hutsonville (Diesel)	Hutsonville, Ill.	3,000	11,408
Total oil			189,000
Natural gas (CTs)	Grand Tower	Grand Tower, Ill.	516,000	7,883
	Elgin^(h)	Elgin, Ill.	452,000	12,163
	Pinckneyville	Pinckneyville, Ill.	320,000^(f)	11,199
	Gibson City^(d)	Gibson City, Ill.	234,000	11,997
	Kinmundy^(d)	Kinmundy, Ill.	232,000^(f)	11,996
	Joppa 7B⁽ⁱ⁾	Joppa, Ill.	162,000	10,761
	Columbia^(j)	Columbia, Mo.	140,000	12,925
Total natural gas			2,056,000
Total Genco			4,751,000
CILCO:
Coal	E.D. Edwards^(k)	Bartonville, Ill.	744,000	10,452
	Duck Creek^(k)	Canton, Ill.	355,000	10,043
Total coal			1,099,000
Oil	Hallock	Peoria, Ill.	12,800	10,275
	Kickapoo	Lincoln, Ill.	12,800	10,275
Total oil			25,600
Natural gas	Sterling Avenue^(k)	Peoria, Ill.	30,000	16,245
	Indian Trails	Pekin, Ill.	10,000	5,279
Total natural gas			40,000
Total CILCO			1,164,600
Medina Valley:
Natural gas	Medina Valley	Mossville, Ill.	44,000	5,990
Total Ameren			15,219,800

(a)	“Net Kilowatt Capability” is generating capacity available for dispatch from the facility into the electric transmission grid.

(b)	“Net Heat Rate” is the amount of energy to produce a given unit of output; it is expressed as Btu per kilowatthour.

(c)	For information regarding a lease arrangement applicable to these CTs, see Note 6 - Long-term Debt and Equity Financings to our financial statements under Part II, Item 8, of this report.

(d)	CT has the capability of operating on either oil or natural gas (dual fuel).

(e)	Represents CTs to be added in 2005.

(f)	Approximately 550 megawatts of generating capacity (Pinckneyville and Kinmundy) are expected to be sold by Genco to UE subject to receipt of necessary regulatory approvals.

(g)	This amount represents Ameren’s 80% interest in EEI. See Note 1 - Summary of Significant Accounting Policies to our financial statements under Part II, Item 8, of this report.

(h)	There is a tolling agreement in place for one of Elgin’s units (approximately 100 megawatts).

(i)

These CTs are owned by Genco and leased to its parent, Development Company. The operating lease is for a minimum term of 15 years expiring September 30, 2015. Genco receives rental payments under the lease in fixed monthly amounts that vary over the term of the lease and range from $0.8 million to $1.0 million.

(j)

Genco has granted the city of Columbia, Missouri options to purchase an undivided ownership interest in these facilities, which would result in a sale of up to 72 megawatts (about 50%) of the facilities. Columbia can exercise one option for 36 megawatts at the end of 2010 for a purchase price of $15.5 million, at the end of 2014 for a purchase price of $9.5 million, or at the end of 2020 for a purchase price of $4 million. The other option can be exercised for another 36 megawatts at the end of 2013 for a purchase price of $15.5 million, at the end of 2017 for a purchase price of $9.5 million, or at the end of 2023 for a purchase price of $4 million. A power purchase agreement pursuant to which Columbia is now purchasing up to 72 megawatts of capacity and energy generated by these facilities from Marketing Company will terminate if the city exercises the purchase options.

(k)	These facilities were contributed by CILCO to AERG in October 2003. See Note 1 - Summary of Significant Accounting Policies to our financial statements under Part II, Item 8, of this report.

As of December 31, 2004, UE owned 3,200 circuit miles of electric transmission lines and operated two propane-air plants and 3,050 miles of natural gas transmission and distribution mains. As of December 31, 2004, CIPS owned 1,900 circuit miles of electric transmission lines and operated one propane-air plant, three underground gas storage fields with a total working capacity of 3 billion cubic feet, and 5,000 miles of natural gas transmission and distribution mains. As of December 31, 2004, CILCO owned 350 circuit miles of electric transmission lines. CILCO operates two underground gas storage fields with a total working capacity of 6 billion cubic

feet and 3,800 miles of gas transmission and distribution mains. As of December 31, 2004, IP owned 1,700 circuit miles of electric transmission lines. IP owns seven underground gas storage fields with a total working capacity of 15 billion cubic feet and 8,500 miles of natural gas transmission and distribution mains. Our other properties include distribution lines, under-ground cables, office buildings, warehouses, garages, and repair shops.

We have fee title to all principal plants and other units of property material to the operation of our businesses, and to the real property on which such facilities are located (subject to mortgage liens securing our outstanding first mortgage bond indebtedness and to certain permitted liens and judgment liens), except that:

A portion of UE’s Osage plant reservoir, certain facilities at UE’s Sioux plant, most of UE’s Peno Creek CT facility, Genco’s Columbia CT facility, certain of Ameren’s substations and most of our transmission and distribution lines and gas mains are situated on lands we occupy under leases, easements, franchises, licenses or permits;

·	The United States or the state of Missouri may own or may have paramount rights to certain lands lying in the bed of the Osage River or located between the inner and outer harbor lines of the Mississippi River, on which certain of UE’s generating and other properties are located; and

·	The United States, the state of Illinois, the state of Iowa or the city of Keokuk, Iowa, may own or may have paramount rights with respect to certain lands lying in the bed of the Mississippi River on which a portion of UE’s Keokuk plant is located.

Substantially all of the properties and plant of UE, CIPS, CILCO and IP are subject to the direct first liens of the indentures securing their mortgage bonds. In October 2003, CILCO transferred substantially all of its generating property and plant to its non-rate-regulated electric generating subsidiary, AERG. As part of the transfer, CILCO’s transferred generating property and plant was released from the lien of the indenture securing its first mortgage bonds. During 2005, UE plans to transfer its Illinois electric and gas transmission and distribution properties to CIPS, depending on the outcome of pending regulatory proceedings. See Note 3 - Rate and Regulatory Matters to our financial statements under Part II, Item 8, of this report for further information. As a part of the transfer, UE’s Illinois electric and gas transmission and distribution properties will be released from the lien of the indenture securing its first mortgage bonds and will become encumbered by the direct first lien of the indenture securing the CIPS first mortgage bonds.

In December 2002, UE conveyed most of its Peno Creek CT facility to the city of Bowling Green, Missouri, and leased the facility back from the city for a 20-year term. As a part of the transaction, most of UE’s Peno Creek property and plant was released from the lien of the indenture securing UE’s first mortgage bonds. Under the terms of this capital lease, UE retains all operation and maintenance responsibilities for the facility, and ownership of the facility will return to UE at the expiration of the lease. When ownership of the Peno Creek facility is returned to UE by Bowling Green, the property and plant may again become encumbered by the direct first lien of any outstanding UE first mortgage bond indenture.

ITEM 3. LEGAL PROCEEDINGS.

We are involved in legal and administrative proceedings before various courts and agencies with respect to matters arising in the ordinary course of business, some of which involve sub-stantial amounts of money. We believe that the final disposition of these proceedings, except as otherwise disclosed in this report, will not have a material adverse effect on our results of operations, financial position or liquidity. Risk of loss is mitigated, in some cases, by insurance or contractual or statutory indemnification. We believe that we have established appropriate reserves for potential losses.

For additional information on legal and administrative proceedings, see Rates and Regulation under Item 1. Business above, Liquidity and Capital Resources and Regulatory Matters in Management’s Discussion and Analysis of Financial Condition and Results of Operations under Part II, Item 7, of this report , Note 3 - Rate and Regulatory Matters, and Note 15 - Commitments and Contingencies to our financial statements under Part II, Item 8, of this report.

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

There were no matters submitted to a vote of security holders during the fourth quarter of 2004 with respect to any of the Ameren Companies.

EXECUTIVE OFFICERS OF THE REGISTRANTS (ITEM 401(b) OF REGULATION S-K):

The executive officers of the Ameren Companies, including major subsidiaries, are listed below, along with their ages as of December 31, 2004, all positions and offices held with the Ameren Companies, tenure as officer, and business background for at least the last five years. Some executive officers hold multiple positions within the Ameren Companies; their titles are given in the description of their business experience.

AMEREN CORPORATION:

Name

Age at

12/31/04

Positions and Offices Held and Business Experience

Gary L. Rainwater

58

Chairman, Chief Executive Officer, President and Director

Rainwater joined UE in 1979 as an engineer. He was elected vice president, corporate planning, in 1993. Rainwater was elected executive vice president of CIPS in January 1997 and president and chief executive officer of CIPS in December 1997. He was elected president of Resources Company in 1999 and Genco in 2000. He was elected president and chief operating officer of Ameren, UE, and Ameren Services in August 2001, at which time he relinquished his position as president of Resources Company and Genco. In January 2003, Rainwater was elected president and chief executive officer of CILCORP and CILCO upon Ameren’s acquisition of those companies. Effective January 1, 2004, Rainwater became chairman and chief executive officer of Ameren, UE, and Ameren Services, in addition to being president. At that time, he was also elected chairman of CILCORP and CILCO. Rainwater was elected chairman, chief executive officer and president of IP in September 2004 upon Ameren’s acquisition of that company. He currently holds the position of chairman and chief executive officer of CIPS, CILCO and IP, after relinquishing his position as president in October 2004.

Warner L. Baxter

43

Executive Vice President and Chief Financial Officer

Baxter joined UE in 1995 as assistant controller. He was promoted to controller of UE in 1996 and was elected vice president and controller of Ameren and UE in 1998. Baxter was elected vice president and controller of CIPS and Genco in 1999 and 2000, respectively. He was elected senior vice president, finance, of Ameren, UE, CIPS, Ameren Services, and Genco in 2001. In January 2003, Baxter was elected senior vice president of CILCORP and CILCO upon Ameren’s acquisition of those companies. Baxter was elected to his present position at Ameren, UE, CIPS, Genco, AERG, AFS, Medina Valley, CILCORP, and CILCO in October 2003 and at IP in September 2004, upon Ameren’s acquisition of that company.

Thomas R. Voss

57

Executive Vice President and Chief Operating Officer

Voss joined UE in 1969 as an engineer. From 1973 to 1998, he held various positions at UE, including district manager and distribution operating manager. Voss was elected vice president of CIPS in 1998 and senior vice president of UE and CIPS in 1999. He was elected senior vice president of CILCORP and CILCO in 2003 and of IP in September 2004 upon Ameren’s acquisitions of those companies. In October 2003, Voss was elected president of Genco, Resources Company, Marketing Company, AFS, Ameren Energy, Medina Valley, and AERG. However, with the exception of Ameren Energy, Medina Valley, and Resources Company, Voss relinquished his position as president of these companies in October 2004. He was elected to his present position at Ameren in January 2005.

Steven R. Sullivan

44

Senior Vice President, General Counsel and Secretary

Sullivan joined Ameren, UE and CIPS in 1998 as vice president, general counsel and secretary, and he added that position at Genco in 2000. In January 2003, Sullivan was elected vice president, general counsel, and secretary of CILCORP and CILCO upon Ameren’s acquisition of those companies. He was elected to his present position at Ameren, UE, CIPS, Genco, Marketing, Resources Company, AERG, AFS, Medina Valley, CILCORP, and CILCO in October 2003 and at IP in September 2004 upon Ameren’s acquisition of that company.

Jerre E. Birdsong

50
Vice President and Treasurer

Birdsong joined UE in 1977 as an economist. He was promoted to assistant treasurer in 1984 and manager of finance in 1989. He was elected as treasurer of UE in 1993. He was elected treasurer of Ameren and CIPS in 1997, Resources Company in 1999, Genco, AFS and Marketing in 2000, and AERG and Medina Valley in 2003. In addition to being treasurer, in 2001 he was elected to the position of vice president at Ameren and the subsidiaries listed above, with the exception of AERG and Medina Valley. Birdsong was elected vice president at AERG and Medina Valley in 2003. Additionally, he was elected vice president and treasurer of CILCORP and CILCO in January 2003, and of IP in September 2004, upon Ameren’s acquisitions of those companies.

Name	Age at 12/31/04	Positions and Offices Held and Business Experience
Martin J. Lyons	38	Vice President and Controller
Lyons joined Ameren, UE, CIPS and Genco in October 2001 as controller. He was elected controller of CILCORP and CILCO in January 2003 upon Ameren’s acquisition of those companies. In addition to being controller, he was elected vice president of Ameren, UE, CIPS, Genco, AERG, AFS, Medina Valley, CILCORP, and CILCO in 2003 and vice president and controller of IP in September 2004, upon Ameren’s acquisition of that company. He was previously employed by PricewaterhouseCoopers LLP for 13 years, most recently as a partner.
SUBSIDIARIES:

Mark C. Birk	40	Vice President
Birk joined UE in 1986 as an assistant engineer. From 1986 to1989, he handled engineering projects in the nuclear division. In 1989, he joined UE’s Meramec Plant, where he was promoted to engineer in 1990. In 1996, he was named power supply supervisor in the Energy Supply Operations Function, where he held a series of successively higher positions—moving to manager of the function in 2000 and then to general manager. In 2001, Birk was named general manager of energy delivery technical services of Ameren Services, and in 2003 he was elected vice president of Ameren Energy and of energy supply operations at Ameren Services, after serving as vice president of energy delivery technical services. In September 2004, Birk was elected vice president of power operations at UE.

Maureen A. Borkowski	48	Vice President
Borkowski joined UE in 1981 as an engineer in the Corporate Planning Department, where she later served as supervising engineer and senior supervising engineer. She was promoted to manager of UE’s energy supply services in 1989 and appointed manager of UE’s energy services in 1993, manager of Ameren Services’ regulatory planning in 1998, and manager of Ameren Services’ ARES Business Center in 1999. Borkowski left Ameren Services in May 2000 and worked as a consultant for MCR Performance Solutions and later as president of Borkowski Enterprises, Inc. She returned to Ameren Services in 2005. She was elected vice president, transmission, of Ameren Services in January 2005.

Charles A. Bremer	60	Vice President
Bremer joined UE in 1966 as a student engineer, joined UE’s Legal Department as an attorney in 1973, and was named UE’s director of supply services in 1982. From 1984 to 1988, Bremer held the title of vice president, supply services and later directed technical services for UE from 1988 to 1993. He was elected vice president of information technology at UE in 1993 and vice president of information technology at Ameren Services in 1997.

Scott A. Cisel	51	President and Chief Operating Officer
Cisel assumed the position of vice president and chief operating officer for CILCO in 2003, upon Ameren’s acquisition of that company. Prior to that acquisition, he served as senior vice president of CILCO. Cisel has held various management positions at CILCO in sales, customer services, and district operations, including service as manager of commercial office operations in 1981, manager of consumer and energy services in 1984, manager of rates, sales and customer service in 1988, director of corporate sales in 1993. From 1995 to 2001, he was vice president, at first managing sales and marketing, then legislative and public affairs, and later sales, marketing and trading. In April 2001, he was elected senior vice president of CILCO. In September 2004, Cisel was elected vice president of UE. In October 2004, he was elected president and chief operating officer of CIPS, CILCO and IP.

Daniel F. Cole	51	Senior Vice President
Cole joined UE in 1976 as an engineer. He was named UE’s manager of resource planning in 1996 and general manager of corporate planning in 1997. In 1998, Cole was elected vice president of corporate planning of Ameren Services. He was elected senior vice president at UE and Ameren Services in 1999 and at CIPS in 2001. He was elected president of Genco in 2001 and relinquished that position in 2003. He was elected senior vice president at CILCORP and CILCO in 2003 and at IP in September 2004, upon Ameren’s acquisitions of those companies.

J. L. Davis	57	Vice President
Davis joined CIPS in 1972 as assistant engineer in the Gas Department and held various other positions until being named manager of the Gas Department in 1989. In 1997, Davis was elected vice president of gas supply and operations support for Ameren Services. He was elected vice president of division operations and gas support for CIPS in 2003. In January 2005, Davis was named vice president of gas operations support for Ameren Services.

Name	Age at 12/31/04	Positions and Offices Held and Business Experience
Scott A. Glaeser	40	Vice President
Glaeser joined UE in 1991 as a fuel buyer for natural gas in the Fossil Fuels Department. In 1994, he transferred to UE’s Energy Services Department as an engineer, gas supply and planning. In 1998, Glaeser was named supervising engineer, and later that year he was named manager, gas supply and transportation at Ameren Services. He was elected vice president of gas supply and system control for AFS in 2004.

R. Alan Kelley	52	President
Kelley joined UE in 1974 as an engineer. He was named UE’s manager of corporate pPlanning in 1985, vice president of energy supply in 1988 and vice president of Resources Company in 2000. Kelley was elected senior vice president of Ameren Services and Genco in 1999 and 2000, respectively. He was elected senior vice president at CILCO in January 2003 upon Ameren’s acquisition of that company. In October 2004, Kelley was elected president of Genco, AERG, and Medina Valley and senior vice president of UE.

Richard J. Mark	49	Senior Vice President
Mark joined Ameren Services in January 2002 as vice president of customer service. In 2003, he was elected vice president of governmental policy and consumer affairs at Ameren Services with responsibility for government affairs, economic development, and community relations for Ameren’s operating utility companies. He was elected senior vice president at UE and Ameren Services in January 2005, with responsibility for Missouri energy delivery. Prior to joining Ameren, Mark was employed for 11 years by Ancilla System Inc. During that time, he served as vice president for governmental affairs, chief operating officer, and the final six years as chief executive officer of St. Mary’s Hospital.

Donna K. Martin	57	Senior Vice President and Chief Human Resources Officer
Martin joined Ameren Services in May 2002 as vice president, human resources. In 2004, she assumed the additional responsibility of the corporate communications function. In February 2005, Martin was elected senior vice president and chief human resources officer. Prior to joining Ameren, she was employed from 2000 to 2002 by Faulding Pharmaceuticals of Paramus, New Jersey where she was senior vice president, human resources. Martin also served as head of human resources in North America for Pharmacia from 1999 to 2000, after working as vice president of human resources for both Monsanto Company and Baxter Healthcare Corporation.

Michael L. Menne	50	Vice President
Menne joined the Environmental Services Department of UE in 1976. In 1987, he was named supervising environmental scientist and headed the air quality section of UE’s environmental, safety and health function. In 1998, Menne became manager of Ameren Services’ environmental affairs and was named manager of Ameren Services’ environmental, safety and health function in 2000. Menne was elected vice president, environmental safety and health for Ameren Services, in 2002.

Michael L. Moehn	35	Vice President
Moehn joined Ameren Services as assistant controller in June 2000. Prior to joining Ameren Services, he was employed for nine years by PricewaterhouseCoopers LLP, most recently as a senior manager. He was named director of Ameren Services’ corporate modeling and transaction support in 2001 and elected vice president of business services for Resources Company in 2002. In 2004, Moehn was elected vice president of corporate planning for Ameren Services.

Michael G. Mueller	41	President
Mueller joined UE in 1986 as an engineer in corporate planning. In 1988, he became a fuel buyer in the Fossil Fuel Department, and in 1994 he was named senior fuel buyer for UE. In 1998, Mueller became director of coal trade for Ameren Energy and in 1999 he was promoted to manager of the Fossil Fuel Department of Ameren Services. Mueller was elected vice president of AFS in 2000 and president of AFS in 2004.

Charles D. Naslund	52	Senior Vice President and Chief Nuclear Officer
Naslund joined UE in 1974 as an assistant engineer in Engineering and Construction. He became manager, nuclear operations support, in 1986 and in 1991 was named manager, nuclear engineering. He was elected vice president of power operations at UE in 1999 and vice president of nuclear operations in September 2004. Naslund was elected senior vice president and chief nuclear officer at UE in January 2005, succeeding Garry L. Randolph, who retired on December 31, 2004.

Name	Aget at 12/31/04	Positions and Offices Held and Business Experience
Robert K. Neff	52	Vice President
Neff joined UE in 1982 as a fuel buyer in the Fossil Fuel Department. He was named senior fuel buyer in the Fossil Fuel Department in 1988 and supervisor of gas supply in the Corporate Planning Department in 1994. Neff was named general supervisor in UE’s Division Marketing Department in 1996 and transportation director in the Fossil Fuel Department at Ameren Services in 1999. He was named manager of coal supply and transportation for AFS in 2000. In 2004, Neff was elected vice president of coal supply and transportation for AFS.

Craig D. Nelson	51	Vice President
Nelson joined CIPS in 1979 as a tax accountant and was later promoted to income tax supervisor. He assumed positions of increasing responsibility and became treasurer and assistant secretary in 1989 and vice president, corporate services, in 1996. Nelson was elected vice president, merger coordination, at Ameren Services and CIPS in 1998. He was elected vice president, corporate planning, at Ameren Services in 1999 and vice president, strategic initiatives, at Ameren Services in October 2004.

Gregory L. Nelson	47	Vice President
Nelson joined UE in 1995 as manager of the tax department. He was elected vice president of Ameren Services in 1999 and vice president of UE, CIPS, Genco, CILCORP, CILCO, Marketing Company, AFS, Medina Valley, Resources Company

Robert L. Powers	56	Vice President
Powers joined UE in 1976 as an engineer. He was named UE supervising engineer in 1977, superintendent in 1985, assistant manager in 1990, and manager in 1995. In 2000, Powers was elected vice president of Genco and president of EEI. He was elected vice president at AERG and Medina Valley in 2003 and at Ameren Services, Generation Technical Services, in 2004.

David J. Schepers	51	Vice President
Schepers joined UE in 1974 and was promoted to district engineer at UE in 1981. In 1989, he was named supervising engineer in UE’s Distribution Planning Department. In 1992, Schepers was promoted to superintendent of service test, in UE’s Distribution Services Department. He was named superintendent of UE’s Distribution Services in 1994 and promoted to manager of UE’s regional operations in 1996. In 1998, he was named manager of Ameren Services’ distribution operations and in 2003, promoted to general manager of Ameren Services’ energy delivery technical services. In 2004, Schepers was elected vice president of Ameren Services’ energy delivery technical services.

Shawn E. Schukar	43	Vice President
Schepers joined UE in 1974 and was promoted to district engineer at UE in 1981. In 1989, he was named supervising engineer in UE’s Distribution Planning Department. In 1992, Schepers was promoted to superintendent of service test, in UE’s Distribution Services Department. He was named superintendent of UE’s Distribution Services in 1994 and promoted to manager of UE’s regional operations in 1996. In 1998, he was named manager of Ameren Services’ distribution operations and in 2003, promoted to general manager of Ameren Services’ energy delivery technical services. In 2004, Schepers was elected vice president of Ameren Services’ energy delivery technical services.

Andrew M. Serri	43	President
Serri joined Marketing Company as vice president of sales and marketing in 2000. Prior to joining Ameren, he was employed by Carolina Power & Light (CP&L), now Progress Energy. At CP&L, he held the position of manager, marketing and trading. Prior to CP&L, Serri spent 18 years at American Electric Power working in several areas, including engineering, system operations and power marketing and trading. Serri was elected vice president of marketing and trading in 2004, before being elected president of Marketing Company and vice president of Ameren Energy that same year.

Jerry L. Simpson	48	Vice President
Simpson joined CIPS in 1978 as an engineer at Newton Power Station. He held various positions until being named manager of Meredosia Power Station in 1994. Simpson was elected vice president of CIPS in 1999, of Genco in 2000, and of AERG and Medina Valley in 2003.

Name
Age at

12/31/04

Positions and Offices Held and

Business Experience

Dennis W. Weisenborn

50

Vice President

Weisenborn joined UE in 1974 in the Customer Business Department. In 1977, he moved to the Engineering and Construction Department as a senior construction draftsman, before joining the Real Estate Department in 1985. He was promoted to real estate supervisor in 1989 and to manager at Ameren Services in 1999. In 2003, Weisenborn was promoted to general manager, supply services, at Ameren Services. In October 2004, Weisenborn was elected vice president of UE, Ameren Services, CIPS, CILCO, Genco, IP, and AERG.

David A. Whiteley

48

Senior Vice President

Whiteley joined UE in 1978 as an engineer. In 1993, he was named manager of transmission planning and later manager of electrical engineering and transmission planning. In 2000, Whiteley was elected vice president of Ameren Services, responsible for engineering and construction and later energy delivery technical services. He was elected senior vice president of UE, CIPS and Genco in 2001, of AERG, CILCORP and CILCO in 2003, and of IP in September 2004.

Ronald C. Zdellar

60

Vice President

Zdellar joined UE in 1971 as assistant engineer. In 1988, he became vice president, transmission and distribution, and in 1995 he became vice president, customer services, at UE. After the merger of UE and CIPSCO in 1997, Zdellar was elected vice president of Ameren Services. He assumed the position of vice president, energy delivery - distribution services at UE in 2002.

Officers are generally elected or appointed annually by the respective board of directors of each company following the election of board members at the annual meetings of shareholders. No special arrangement or understanding exists between any of the above-named executive officers and the Ameren Companies nor to our knowledge, any other person or persons pursuant to which any executive officer was selected as an officer. There are no family relationships among the officers. Except for Martin J. Lyons, Richard J. Mark, Michael L. Moehn, and Donna K. Martin, each of the above-named executive officers has been employed by an Ameren company for more than five years in executive or manage-ment positions.

PART II

ITEM 5. MARKET FOR REGISTRANTS’ COMMON EQUITY, RELATED STOCKHOLDER MATTERS, AND ISSUER

PURCHASES OF EQUITY SECURITIES.

Ameren’s common stock is listed on the NYSE (ticker symbol: AEE). Ameren began trading on January 2, 1998, following the merger of UE and CIPSCO on December 31, 1997. Ameren has submitted to the NYSE a certificate of the chief executive officer of Ameren certifying that he is not aware of any violation by Ameren of NYSE corporate governance listing standards.

Ameren common shareholders of record totaled 86,986 on January 31, 2005. The following table presents the price ranges and dividends paid per Ameren common share for each quarter during 2004 and 2003.

High

Low

Close

Dividends Paid

AEE 2004 Quarter Ended:

March 31

48.34

44.91

46.09

63½¢

June 30

46.28

40.55

42.96

63½

September 30

46.99

42.00

46.15

63½

December 31

50.36

45.95

50.14

63½

AEE 2003 Quarter Ended:

March 31

44.73

37.43

39.05

63½¢

June 30

46.50

38.89

44.10

63½

September 30

44.80

40.74

42.91

63½

December 31

46.17

42.55

46.00

63½

There is no trading market for the common stock of UE, CIPS, Genco, CILCORP, CILCO or IP. Ameren holds all outstanding common stock of UE, CIPS, CILCORP and IP; Development Company holds all outstanding common stock of Genco; and CILCORP holds all outstanding common stock of CILCO.

The following table sets forth the quarterly common stock dividend payments made by Ameren and its subsidiaries, including amounts retained by Ameren Corporation during 2004 and 2003:

	2004								2003
	Quarter Ended								Quarter Ended
Registrant	December 31		September 30		June 30		March 31		December 31			September 30			June 30			March 31
UE	$	85	$	85	$	66	$	79	$	64		$	59		$	83		$	82
CIPS		29		17		10		19		8			15			20			19
Genco		9		22		17		18		14			20			1			1
CILCORP^(a)		-		-		18		-		17			10			-			-
IP^(b)		-		-		-		-		-			-			-			-
Ameren (parent)		-		-		-		-		(1	)		(1	)		(1	)		-
Non-Registrants		-		-		5		-		-			-			-			-
Paid by Ameren	$	123	$	124	$	116	$	116	$	102		$	103		$	103		$	102

(a)	CILCO paid dividends of $10 million, $18 million, $23 million, and $21 million in the periods ended June 30, 2004, and June 30, September 30 and December 31, 2003, respectively.

(b)	Prior to October 2004, the ICC prohibited IP from paying dividends. If permitted to be paid, IP’s dividends would have been paid directly to Illinova or indirectly to Dynegy.

On February 11, 2005, the board of directors of Ameren declared a quarterly dividend on Ameren’s common stock of 63.5 cents per share. The common share dividend is payable March 31, 2005, to stockholders of record on March 9, 2005.

For a discussion of restrictions on the Ameren Companies’ payment of dividends, see Liquidity and Capital Resources in Management’s Discussion and Analysis of Financial Condition and Results of Operations under Part II, Item 7, of this report.

The following table presents Ameren’s purchases of equity securities reportable under Item 703 of Regulation S-K:

Period	(a) Total Number of Shares (or Units) Purchased^*		(b) Average Price Paid per Share (or Unit)		(c) Total Number of Shares (or Units) Purchased as Part of Publicly Announced Plans or Programs		(d) Maximum Number (or Approximate Dollar Value) of Shares that May Yet Be Purchased Under the Plans or Programs
October 1 - 31, 2004		136,993	$	48.07		-		-
November 1 - 30, 2004		147,250		48.90		-		-
December 1 - 31, 2004		2,675		48.88		-		-
Total		286,918	$	48.50		-		-

* These shares of Ameren common stock were purchased by Ameren in open-market transactions in satisfaction of Ameren’s obligations upon the exercise by employees of options issued under Ameren’s Long-term Incentive Plan of 1998. Ameren does not have any publicly announced equity securities repurchase plans or programs.

None of the other Ameren Companies purchased equity securities reportable under Item 703 of Regulation S-K during the period October 1 to December 31, 2004.

ITEM 6. SELECTED FINANCIAL DATA.

For the years ended December 31, (In millions, except per share amounts)	2004		2003		2002^(a)		2001^(a)(c)(g)		2000^(b)(c)(g)
Ameren:
Operating revenues^(d)	$	5,160	$	4,608	$	3,841	$	3,858	$	3,856
Operating income^(d)		1,078		1,090		873		965		941
Net income^(a)(j)		530		524		382		469		457
Common stock dividends		479		410		376		350		349
Earnings per share - basic^(d)(j)		2.84		3.25		2.61		3.41		3.33
- diluted^(d)(j)		2.84		3.25		2.60		3.40		3.33
Common stock dividends per share		2.54		2.54		2.54		2.54		2.54
As of December 31,
Total assets^(e)	$	17,434	$	14,236	$	12,151	$	10,401	$	9,714
Long-term debt, excluding current maturities		5,021		4,070		3,433		2,835		2,745
Preferred stock subject to mandatory redemption		20		21		-		-		-
Preferred stock not subject to mandatory redemption		195		182		193		235		235
Common stockholders’ equity		5,800		4,354		3,842		3,349		3,197
UE:
Operating revenues	$	2,660	$	2,637	$	2,650	$	2,786	$	2,720
Operating income		673		787		644		681		679
Net income after preferred stock dividends^(j)		373		441		336		365		344
Distribution to parent		315		288		299		283		207

For the years ended December 31, (In millions, except per share amounts)		2004		2003		2002^(a)	⁾		2001^(a)(g)	⁾		2000^(b)(c)(g)
As of December 31,
Total assets^(e)	$	8,750	$	8,517	$	8,103		$	7,288		$	7,116
Long-term debt, excluding current maturities		2,059		1,758		1,687			1,599			1,760
Preferred stock not subject to mandatory redemption		113		113		113			155			155
Common stockholders’ equity		2,883		2,810		2,632			2,654			2,571
CIPS:
Operating revenues	$	735	$	742	$	824		$	840		$	894
Operating income		58		45		52			69			135
Net income after preferred stock dividends		29		26		23			42			75
Distribution to parent		75		62		62			33			54
As of December 31,
Total assets^(e)	$	1,615	$	1,742	$	1,821		$	1,783		$	1,867
Long-term debt, excluding current maturities		430		485		534			579			463
Preferred stock not subject to mandatory redemption		50		50		80			80			80
Common stockholders’ equity		440		482		512			564			555
Genco:
Operating revenues	$	876	$	788	$	743		$	730		$	480
Operating income		265		197		138			195			103
Net income^(j)		107		75		32			76			44
Distribution to parent		66		36		21			-			-
As of December 31,
Total assets	$	1,955	$	1,977	$	2,010		$	1,756		$	1,394
Long-term debt, excluding current maturities		473		698		698			424			424
Subordinated intercompany notes		283		411		462			508			602
Common stockholder’s equity		435		321		280			274			44
CILCORP:^(f)
Operating revenues	$	722	$	926	$	790		$	786		$	724
Operating income		61		85		98			116			97
Net income^(j)		10		23		25			24			11
Distribution to parent		18		27		-			15			9
As of December 31,
Total assets^(e)	$	2,156	$	2,136	$	1,928		$	1,814		$	1,949
Long-term debt, excluding current maturities		623		669		791			718			720
Preferred stock of subsidiary subject to mandatory redemption		20		21		22			22			22
Preferred stock of subsidiary not subject to mandatory redemption		19		19		19			19			19
Common stockholder’s equity		548		478		495			517			470
CILCO:^(g)
Operating revenues	$	688	$	839	$	731		$	740		$	636
Operating income		58		53		97			47			73
Net income after preferred stock dividends^(j)		30		43		48			12			45
Distribution to parent		10		62		40			45			26
As of December 31,
Total assets^(e)	$	1,381	$	1,324	$	1,250		$	1,043		$	1,107
Long-term debt, excluding current maturities		122		138		316			243			245
Preferred stock subject to mandatory redemption		20		21		22			22			22
Preferred stock not subject to mandatory redemption		19		19		19			19			19
Common stockholders’ equity		418		323		323			341			351
IP:
Operating revenues^(h)	$	1,539	$	1,568	$	1,518		$	1,614		$	1,586
Operating income^(h)		216		178		203			207			169
Net income after preferred stock dividends^{(h) (j)}		137		115		159			158			121
Distribution to parent		-		-		-			100			-
As of December 31,
Total assets^(e)	$	3,117	$	5,059	$	5,050		$	4,929		$	5,039
Long-term debt, excluding current maturities		713		1,435		1,719			1,606			1,788
Long-term debt to IP SPT, excluding current maturities⁽ⁱ⁾		277		345		-			-			-
Preferred stock subject to mandatory redemption		-		-		-			-			100
Preferred stock not subject to mandatory redemption		46		46		46			46			46
Common stockholders’ equity		1,234		1,484		1,366			1,222			1,156

(a)

At Ameren, UE and Genco, revenues were netted with costs upon adoption of EITF No. 02-3 and the rescission of EITF No. 98-10 in 2003. The amounts were netted as follows at Ameren: 2002 - $738 million; 2001 - $648 million; at UE: 2002 - $458 million; 2001 - $392 million; and at Genco: 2002 - $253 million; 2001 - $256 million.

(b)	On May 1, 2000, CIPS transferred its electric generating assets and related liabilities, at net book value, to Genco, in exchange for a subordinated promissory note from Genco in the principal amount of $552 million and 1,000 shares of Genco’s common stock.

(c)	Amounts for IP have not been reclassified to conform to Ameren classifications for 2001 and 2000. Amounts for CILCORP and CILCO have not been reclassified to conform to Ameren classifications for 2000.

(d)

Includes amounts for IP since the acquisition date of September 30, 2004; includes amounts for CILCORP since the acquisition date of January 31, 2003; and includes amounts for Ameren Registrant and non-Registrant subsidiaries and intercompany eliminations. See Note 2 - Acquisitions to our financial statements under Part II, Item 8, of this report.

(e)

Estimated future removal costs embedded in accumulated depreciation within our regulated operations at December 31, 2002, of $652 million at Ameren, $528 million at UE, $124 million at CIPS, $27 million at CILCORP, $141 million at CILCO, and $69 million at IP were reclassified to a regulatory liability to conform to current period presentation. Prior periods were not reclassified for any of the Ameren Companies, except IP, which includes reclassifications of $68 million and $62 million for 2001 and 2000, respectively. See Note 1 - Summary of Significant Accounting Policies to our financial statements under Part II, Item 8, of this report for further information.

(f)	CILCORP consolidates CILCO and therefore includes CILCO amounts in its balances.

(g)	The consolidated financial statements of IP for the years ended December 31, 2001 and 2000, were audited by independent accountants that have ceased operations. Please read “Report of Independent Public Accountants” in the accompanying audited financial statements.

(h)	Includes 2004 combined financial data under ownership by Ameren and IP’s former ultimate parent, Dynegy. See Note 2 - Acquisitions to our financial statements under Part II, Item 8, of this report for further information.

(i)	Effective December 31, 2003, IP SPT was deconsolidated from IP’s financial statements in conjunction with the adoption of FIN No. 46R. See Note 1 - Summary of Significant Accounting Policies to our financial statements under Part II, Item 8, of this report for further information.

(j)

Ameren, Genco, CILCORP, CILCO and IP net income included income (loss) from cumulative effect of change in accounting principle of $18 million ($0.11 per share), $18 million, $4 million, $24 million and $(2) million for the year ended December 31, 2003. Ameren, UE and Genco net income included loss from cumulative effect of change in accounting principle of $7 million ($0.05 per share), $5 million and $2 million for the year ended December 31, 2001. CILCORP had a $2 million loss from discontinued operations in 2001 that is included in net income.

ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS.

OVERVIEW

Ameren Executive Summary

Overview

The most significant event for Ameren in 2004 was the announcement, financing and September 30th completion of the $2.3 billion acquisition of IP and an additional 20% ownership interest in EEI.

In 2004, Ameren recorded solid net earnings of $2.84 per share due to weather-adjusted demand growth, the incremental earnings contribution resulting from the acquisitions of IP on September 30, 2004, and CILCORP Inc. on January 31, 2003, and increased earnings from our excess power sales. This earnings performance was accomplished despite very mild summer weather, a planned refueling and maintenance outage at our Callaway nuclear plant and the early issuance of common shares to fund the IP acquisition. Earnings in 2003 included unusual gains of 30 cents per share related to the adoption of an accounting standard and settlement of a dispute with a coal supplier, and there was no Callaway outage required in 2003.

Earnings

Total revenues in 2004 increased 12% to $5.2 billion from 2003. Growth in revenues was generated by the acquisitions of IP and CILCORP, which added $484 million in revenues in 2004. In addition, revenues benefited from weather-adjusted growth, increased excess power sales due to greater availability of low-cost generation and improved power prices, and higher natural gas delivery rates.

During 2004, factors that mitigated this improvement in revenues included extremely mild summer weather and the final $30 million annual rate reduction under the electric rate case settlement in Missouri that went into effect on April 1, 2004. Summer weather in 2004 in our service territory was the seventh mildest of the past 109 years, according to the National Weather service. Mild 2004 weather reduced revenues by an estimated $38 million in 2004, relative to 2003.

Operations and maintenance expenses increased 9% to $1.3 billion in 2004 from 2003, again, primarily because of the acquisitions. Expenses were also higher because of the two-month refueling and maintenance outage at our Callaway nuclear plant, which increased expenses by $39 million, and purchased power costs by $24 million. A 70-day to 75-day outage is scheduled for 2005 in order to replace major equipment that is expected to increase the generating capacity of the Callaway plant by over 50 megawatts and improve future safety and reliability. Employee benefit costs also increased in 2004 as compared with 2003.

Operations expenses benefited from the $18 million refund of exit fees paid to the MISO upon re-entry to that system in 2004 and lower labor costs.

Liquidity

Cash flows from operations of $1.1 billion in 2004 at Ameren, along with other funds, were used to pay dividends to common shareholders of $479 million and fund capital expenditures of $806 million. Cash flows from operations were reduced by a $295 million contribution to our pension plan.

Ameren issued approximately 30 million shares of common stock in 2004 to finance the acquisition of Illinois Power and an additional 20% interest in EEI. Net proceeds of $1.3 billion were used to pay the cash portion of the purchase price of $443 million, and reduce high-cost debt and pay related fees at IP. Other financing activities primarily related to refinancing higher cost or maturing debt in Ameren’s other subsidiaries.

AMEREN CORPORATION
CONSOLIDATED STATEMENT OF INCOME
(In millions, except per share amounts)


	Year Ended December 31,
	2004			2003			2002
Operating Revenues:
Electric	$	4,288		$	3,952		$	3,520
Gas		866			648			315
Other		6			8			6
Total operating revenues		5,160			4,608			3,841
Operating Expenses:
Fuel and purchased power		1,278			1,070			825
Gas purchased for resale		598			457			198
Other operations and maintenance		1,337			1,224			1,160
Voluntary retirement and other restructuring charges		-			-			92
Coal contract settlement		-			(51	)		-
Depreciation and amortization		557			519			431
Taxes other than income taxes		312			299			262
Total operating expenses		4,082			3,518			2,968
Operating Income		1,078			1,090			873
Other Income and (Deductions):
Miscellaneous income		32			27			21
Miscellaneous expense		(9	)		(22	)		(50	)
Total other income and (deductions)		23			5			(29	)
Interest Charges and Preferred Dividends:
Interest		278			277			214
Preferred dividends of subsidiaries		11			11			11
Net interest charges and preferred dividends		289			288			225
Income Before Income Taxes and Cumulative Effect of Change
in Accounting Principle		812			807			619
Income Taxes		282			301			237
Income Before Cumulative Effect of Change in Accounting
Principle		530			506			382
Cumulative Effect of Change in Accounting Principle,
Net of Income Taxes of $-, $12, and $-		-			18			-
Net Income	$	530		$	524		$	382
Earnings per Common Share – Basic:
Income before cumulative effect of change
in accounting principle	$	2.84		$	3.14		$	2.61
Cumulative effect of change in accounting
principle, net of income taxes		-			0.11			-
Earnings per common share – basic:	$	2.84		$	3.25		$	2.61
Earnings per Common Share – Diluted:
Income before cumulative effect of change
in accounting principle	$	2.84		$	3.14		$	2.60
Cumulative effect of change in accounting
principle, net of income taxes		-			0.11			-
Earnings per common share – diluted:	$	2.84		$	3.25		$	2.60
Dividends per Common Share	$	2.54		$	2.54		$	2.54
Average Common Shares Outstanding		186.4			161.1			146.1

The accompanying notes are an integral part of these consolidated financial statements.

AMEREN CORPORATION
CONSOLIDATED BALANCE SHEET
(In millions, except per share amounts)

	December 31,			December 31,
	2004			2003
ASSETS
Current Assets:
Cash and cash equivalents	$	69		$	111
Accounts receivables - trade (less allowance for doubtful
accounts of $14 and $13, respectively)		442			326
Unbilled revenue		336			221
Miscellaneous accounts and notes receivable		38			126
Materials and supplies		623			487
Other current assets		74			46
Total current assets		1,582			1,317
Property and Plant, Net		13,297			10,920
Investments and Other Noncurrent Assets:
Investments in leveraged leases		140			152
Nuclear decommissioning trust fund		235			212
Goodwill and other intangibles, net		940			574
Other assets		411			332
Total investments and other noncurrent assets		1,726			1,270
Regulatory Assets		829			729
TOTAL ASSETS	$	17,434		$	14,236


LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
Current maturities of long-term debt	$	423		$	498
Short-term debt		417			161
Accounts and wages payable		567			480
Taxes accrued		26			103
Other current liabilities		374			215
Total current liabilities		1,807			1,457
Long-term Debt, Net		5,021			4,070
Preferred Stock of Subsidiary Subject to Mandatory Redemption		20			21
Deferred Credits and Other Noncurrent Liabilities:
Accumulated deferred income taxes, net		1,886			1,853
Accumulated deferred investment tax credits		139			151
Regulatory liabilities		1,042			824
Asset retirement obligations		439			413
Accrued pension and other postretirement benefits		756			699
Other deferred credits and liabilities		315			190
Total deferred credits and other noncurrent liabilities		4,577			4,130
Preferred Stock of Subsidiaries Not Subject to Mandatory Redemption		195			182
Minority Interest in Consolidated Subsidiaries		14			22
Commitments and Contingencies (Notes 1, 3, 15 and 16)
Stockholders' Equity:
Common stock, $.01 par value, 400.0 shares authorized -
shares outstanding of 195.2 and 162.9, respectively		2			2
Other paid-in capital, principally premium on common stock		3,949			2,552
Retained earnings		1,904			1,853
Accumulated other comprehensive loss		(45	)		(44	)
Other		(10	)		(9	)
Total stockholders’ equity		5,800			4,354
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$	17,434		$	14,236


The accompanying notes are an integral part of these consolidated financial statements.

AMEREN CORPORATION
CONSOLIDATED STATEMENT OF CASH FLOWS
(In millions)

	December 31,
	2004			2003			2002
Cash Flows From Operating Activities:
Net income	$	530		$	524		$	382
Adjustments to reconcile net income to net cash
provided by operating activities:
Cumulative effect of change in accounting principle		-			(18	)		-
Depreciation and amortization		557			519			431
Amortization of nuclear fuel		31			33			30
Amortization of debt issuance costs and premium/discounts		13			10			8
Deferred income taxes, net		351			12			74
Deferred investment tax credits, net		(12	)		(11	)		(9	)
Coal contract settlement		36			(36	)		-
Voluntary retirement and other restructuring charges		-			(5	)		92
Pension contribution		(295	)		(27	)		(31	)
Other		28			5			8
Changes in assets and liabilities, excluding the effects of the acquisitions:
Receivables, net		(18	)		6			(26	)
Materials and supplies		(25	)		(47	)		(4	)
Accounts and wages payable		29			(16	)		(86	)
Taxes accrued		(67	)		39			38
Assets, other		(62	)		(15	)		(12	)
Liabilities, other		33			49			(68	)
Net cash provided by operating activities		1,129			1,022			827

Cash Flows From Investing Activities:
Capital expenditures		(806	)		(682	)		(787	)
Acquisitions, net of cash acquired		(443	)		(479	)		-
Nuclear fuel expenditures		(42	)		(23	)		(28	)
Other		25			3			12
Net cash used in investing activities		(1,266	)		(1,181	)		(803	)

Cash Flows From Financing Activities:
Dividends on common stock		(479	)		(410	)		(376	)
Capital issuance costs		(40	)		(14	)		(35	)
Redemptions, repurchases, and maturities:
Nuclear fuel lease		(67	)		(46	)		-
Short-term debt		-			(110	)		(370	)
Long-term debt		(1,465	)		(815	)		(247	)
Preferred stock		(1	)		(31	)		(42	)
Issuances:
Common stock		1,441			361			658
Short-term debt		256			-			-
Nuclear fuel lease		-			-			50
Long-term debt		458			698			893
Other		(8	)		9			6
Net cash provided by (used in) financing activities		95			(358	)		537

Net change in cash and cash equivalents		(42	)		(517	)		561
Cash and cash equivalents at beginning of year		111			628			67
Cash and cash equivalents at end of year	$	69		$	111		$	628

Cash Paid During the Periods:
Interest	$	337		$	286		$	221
Income taxes, net		28			266			140


The accompanying notes are an integral part of these consolidated financial statements.

AMEREN CORPORATION
CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY
(In millions)

	December 31,
	2004			2003			2002
Common Stock:
Beginning of year	$	2		$	2		$	1
Shares issued		-			-			1
Common stock, end of year		2			2			2

Other Paid-in Capital:
Beginning of year		2,552			2,203			1,614
Shares issued (less issuance costs of $37, $8 and $20, respectively)		1,404			353			637
Contracted stock purchase payment obligations		-			-			(46	)
Tax benefit of stock option exercises		5			-			-
Employee stock awards		(12	)		(4	)		(2	)
Other paid-in capital, end of year		3,949			2,552			2,203

Retained Earnings:
Beginning of year		1,853			1,739			1,733
Net income		530			524			382
Dividends		(479	)		(410	)		(376	)
Retained earnings, end of year		1,904			1,853			1,739

Accumulated Other Comprehensive Income (Loss):
Derivative financial instruments, beginning of year		12			9			5
Change in derivative financial instruments		5			3			4
Derivative financial instruments, end of year		17			12			9
Minimum pension liability, beginning of year		(56	)		(102	)		-
Change in minimum pension liability		(6	)		46			(102	)
Minimum pension liability, end of year		(62	)		(56	)		(102	)
Total accumulated other comprehensive loss, end of year		(45	)		(44	)		(93	)

Other:
Beginning of year		(9	)		(9	)		(4	)
Restricted stock compensation awards		(6	)		(5	)		(7	)
Compensation amortized and mark-to-market adjustments		5			5			2
Other, end of year		(10	)		(9	)		(9	)

Total Stockholders’ Equity	$	5,800		$	4,354		$	3,842


Comprehensive Income, Net of Taxes:
Net income	$	530		$	524		$	382
Unrealized net gain on derivative hedging instruments,
net of income taxes of $13, $2, and $3, respectively		8			5			6
Reclassification adjustments for gains included in net income,
net of income tax benefit of $(4), $(1), and $(1), respectively		(3	)		(2	)		(2	)
Minimum pension liability adjustment, net of income tax (benefit) of
$(4), $27, and $(62), respectively		(6	)		46			(102	)
Total comprehensive income, net of taxes	$	529		$	573		$	284


Common stock shares at beginning of period		162.9			154.1			138.0
Shares issued		32.3			8.8			16.1
Common stock shares at end of period		195.2			162.9			154.1


The accompanying notes are an integral part of these consolidated financial statements.

UNION ELECTRIC COMPANY
CONSOLIDATED STATEMENT OF INCOME
(In millions)


	Year Ended December 31,
	2004			2003			2002
Operating Revenues:
Electric	$	2,497		$	2,492		$	2,521
Gas		163			145			129
Total operating revenues		2,660			2,637			2,650

Operating Expenses:
Fuel and purchased power		586			566			573
Gas purchased for resale		100			91			73
Other operations and maintenance		785			747			796
Coal contract settlement		-			(51	)		-
Voluntary retirement and other restructuring charges		-			-			65
Depreciation and amortization		294			284			281
Taxes other than income taxes		222			213			218
Total operating expenses		1,987			1,850			2,006

Operating Income		673			787			644

Other Income and (Deductions):
Miscellaneous income		25			23			31
Miscellaneous expense		(7	)		(7	)		(35	)
Total other income and (deductions)		18			16			(4	)

Interest Charges		104			105			103

Income Before Income Taxes		587			698			537

Income Taxes		208			251			193

Net Income		379			447			344

Preferred Stock Dividends		6			6			8

Net Income Available to Common Stockholder	$	373		$	441		$	336


The accompanyig notes as they relate to UE are an integral part of these consolidated financial statements.

UNION ELECTRIC COMPANY
CONSOLIDATED BALANCE SHEET
(In millions, except per share amounts)


	December 31,			December 31,
	2004			2003
ASSETS
Current Assets:
Cash and cash equivalents	$	48		$	15
Accounts receivable - trade (less allowance for doubtful
accounts of $3 and $6, respectively)		188			172
Unbilled revenue		118			111
Miscellaneous accounts and notes receivable		21			117
Materials and supplies		199			175
Other current assets		18			26
Total current assets		592			616
Property and Plant, Net		7,075			6,758
Investments and Other Noncurrent Assets:
Nuclear decommissioning trust fund		235			212
Other assets		263			246
Total investments and other noncurrent assets		498			458
Regulatory Assets		585			685
TOTAL ASSETS	$	8,750		$	8,517


LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
Current maturities of long-term debt	$	3		$	344
Short-term debt		375			150
Borrowings from money pool		2			-
Accounts and wages payable		325			314
Taxes accrued		51			66
Other current liabilities		108			102
Total current liabilities		864			976
Long-term Debt, Net		2,059			1,758
Deferred Credits and Other Noncurrent Liabilities:
Accumulated deferred income taxes, net		1,217			1,289
Accumulated deferred investment tax credits		108			114
Regulatory liabilities		776			652
Asset retirement obligations		431			408
Accrued pension and other postretirement benefits		219			317
Other deferred credits and liabilities		80			80
Total deferred credits and other noncurrent liabilities		2,831			2,860
Commitments and Contingencies (Notes 1, 3, 15 and 16)
Stockholders' Equity:
Common stock, $5 par value, 150.0 shares authorized - 102.1 shares outstanding		511			511
Preferred stock not subject to mandatory redemption		113			113
Other paid-in capital, principally premium on common stock		718			702
Retained earnings		1,688			1,630
Accumulated other comprehensive loss		(34	)		(33	)
Total stockholders' equity		2,996			2,923
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$	8,750		$	8,517


The accompanying notes as they relate to UE are an integral part of these consolidated financial statements.

UNION ELECTRIC COMPANY
CONSOLIDATED STATEMENT OF CASH FLOWS
(In millions)

	Year Ended December 31,
	2004			2003			2002
Cash Flows From Operating Activities:
Net income	$	379		$	447		$	344
Adjustments to reconcile net income to net cash
provided by operating activities:
Depreciation and amortization		294			284			281
Amortization of nuclear fuel		31			33			30
Amortization of debt issuance costs and premium/discounts		5			4			4
Deferred income taxes, net		117			4			29
Deferred investment tax credits, net		(6	)		33			(8	)
Coal contract settlement		36			(36	)		-
Voluntary retirement and other restructuring charges		-			(2	)		65
Pension contributions		(186	)		(18	)		(23	)
Other		94			(5	)		3
Changes in assets and liabilities:
Receivables, net		7			(4	)		(14	)
Materials and supplies		(24	)		(13	)		(6	)
Accounts and wages payable		9			(21	)		(20	)
Taxes accrued		-			(52	)		68
Assets, other		(27	)		(41	)		(30	)
Liabilities, other		20			20			(31	)
Net cash provided by operating activities		749			633			692

Cash Flows From Investing Activities:
Capital expenditures		(524	)		(480	)		(520	)
Nuclear fuel expenditures		(42	)		(23	)		(28	)
Advances to money pool		-			-			84
Other		(14	)		-			10
Net cash used in investing activities		(580	)		(503	)		(454	)

Cash Flows From Financing Activities:
Dividends on common stock		(315	)		(288	)		(299	)
Dividends on preferred stock		(6	)		(6	)		(8	)
Capital issuance costs		(4	)		(6	)		(1	)
Changes in money pool borrowings		2			(15	)		15
Redemptions, repurchases, and maturities:
Nuclear fuel lease		(67	)		(46	)		-
Short-term debt		-			(100	)		-
Long-term debt		(377	)		(367	)		(200	)
Preferred stock		-			-			(42	)
Issuances:
Nuclear fuel lease		-			-			50
Short-term debt		225			-			64
Long-term debt		404			698			173
Other		2			6			4
Net cash used in financing activities		(136	)		(124	)		(244	)

Net change in cash and cash equivalents		33			6			(6	)
Cash and cash equivalents at beginning of year		15			9			15
Cash and cash equivalents at end of year	$	48		$	15		$	9

Cash Paid During the Periods:
Interest	$	101		$	100		$	95
Income taxes, net		115			306			106


The accompanying notes as they relate to UE are an integral part of these consolidated financial statements.

UNION ELECTRIC COMPANY
STATEMENT OF STOCKHOLDERS' EQUITY
(In millions)

	December 31,
	2004			2003			2002
Common Stock	$	511		$	511		$	511

Preferred Stock Not Subject to Mandatory Redemption:
Beginning balance		113			113			155
Redemptions		-			-			(42	)
Preferred stock not subject to mandatory redemption, end of year		113			113			113

Other Paid-in Capital
Beginning balance		702			702			702
Capital contribution from parent		16			-			-
Other paid-in capital, end of year		718			702			702

Retained Earnings:
Beginning balance		1,630			1,477			1,440
Net income		379			447			344
Common stock dividends		(315	)		(288	)		(299	)
Preferred stock dividends		(6	)		(6	)		(8	)
Retained earnings, end of year		1,688			1,630			1,477

Accumulated Other Comprehensive Income (Loss):
Derivative financial instruments, beginning of year		1			4			1
Change in derivative financial instruments		1			(3	)		3
Derivative financial instruments, end of year		2			1			4
Minimum pension liability, beginning of year		(34	)		(62	)		-
Change in minimum pension liability		(2	)		28			(62	)
Minimum pension liability, end of year		(36	)		(34	)		(62	)
Total accumulated other comprehensive loss, end of year		(34	)		(33	)		(58	)


Total Stockholders' Equity	$	2,996		$	2,923		$	2,745


Comprehensive income, net of taxes:
Net income	$	379		$	447		$	344
Unrealized net gain (loss) on derivative hedging instruments,
net of income taxes (benefit) of $1, $(1), and $3, respectively		1			(3	)		4
Reclassification adjustments for gains included in net income,
net of income taxes of $-, $-, and $1, respectively		-			-			(1	)
Minimum pension liability adjustment, net of income taxes (benefit)
of $(2), $16, and $(37), respectively		(2	)		28			(62	)
Total comprehensive income, net of taxes	$	378		$	472		$	285


The accompanying notes as they relate to UE are an integral part of these consolidated financial statements.

CENTRAL ILLINOIS PUBLIC SERVICE COMPANY

STATEMENT OF INCOME

(In millions)

Year Ended December 31,

2004

2003

2002

Operating Revenues:

Electric

$

540

$

557

$

661

Gas

195

185

163

Total operating revenues

735

742

824

Operating Expenses:

Purchased power

325

341

418

Gas purchased for resale

125

121

100

Other operations and maintenance

148

156

161

Voluntary retirement and other restructuring charges

-

-

14

Depreciation and amortization

53

52

51

Taxes other than income taxes

26

27

28

Total operating expenses

677

697

772

Operating Income

58

45

52

Other Income and (Deductions):

Miscellaneous income

24

27

34

Miscellaneous expense

(1

)

(3

)

(2

)

Total other income and (deductions)

23

24

32

Interest Charges

33

34

41

Income Before Income Taxes

48

35

43

Income Taxes

16

6

17

Net Income

32

29

26

Preferred Stock Dividends

3

3

3

Net Income Available to Common Stockholder

$

29

$

26

$

23

The accompanying notes as they relate to CIPS are an integral part of these financial statements.

CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
BALANCE SHEET
(In millions)

	December 31,			December 31,
	2004			2003
ASSETS
Current Assets:
Cash and cash equivalents	$	2		$	16
Accounts receivable - trade (less allowance for doubtful
accounts of $1 and $1, respectively)		48			48
Unbilled revenue		71			64
Miscellaneous accounts and notes receivable		13			22
Current portion of intercompany note receivable - Genco		249			49
Current portion of intercompany tax receivable - Genco		11			12
Materials and supplies		56			51
Other current assets		18			6
Total current assets		468			268
Property and Plant, Net		953			955
Investments and Other Noncurrent Assets:
Intercompany note receivable - Genco		-			324
Intercompany tax receivable - Genco		138			150
Other assets		23			17
Total investments and other noncurrent assets		161			491
Regulatory Assets		33			28
TOTAL ASSETS	$	1,615		$	1,742


LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
Current maturities of long-term debt	$	20		$	-
Accounts and wages payable		76			71
Borrowings from money pool		68			121
Taxes accrued		-			19
Other current liabilities		32			27
Total current liabilities		196			238
Long-term Debt, Net		430			485
Deferred Credits and Other Noncurrent Liabilities:
Accumulated deferred income taxes, net		298			269
Accumulated deferred investment tax credits		10			11
Regulatory liabilities		151			145
Other deferred credits and liabilities		40			62
Total deferred credits and other noncurrent liabilities		499			487
Commitments and Contingencies (Notes 1, 3, and 15)
Stockholders' Equity:
Common stock, no par value, 45.0 shares authorized - 25.5 shares outstanding		-			-
Other paid-in capital		121			120
Preferred stock not subject to mandatory redemption		50			50
Retained earnings		323			369
Accumulated other comprehensive loss		(4	)		(7	)
Total stockholders' equity		490			532
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$	1,615		$	1,742

The accompanying notes as they relate to CIPS are an integral part of these financial statements.

CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
STATEMENT OF CASH FLOWS
(In millions)

	Year Ended December 31,
	2004			2003			2002
Cash Flows From Operating Activities:
Net income	$	32		$	29		$	26
Adjustments to reconcile net income to net cash
provided by operating activities:
Depreciation and amortization		53			52			51
Amortization of debt issuance costs and premium/discounts		1			1			1
Deferred income taxes, net		11			(17	)		(15	)
Deferred investment tax credits, net		(1	)		(2	)		1
Pension contributions		(33	)		(4	)		(4	)
Voluntary retirement and other restructuring charges		-			-			14
Other		26			-			-
Changes in assets and liabilities:
Receivables, net		12			15			7
Materials and supplies		(5	)		(10	)		1
Accounts and wages payable		4			(15	)		(34	)
Taxes accrued		(13	)		(13	)		25
Assets, other		(7	)		16			34
Liabilities, other		(7	)		5			(12	)
Net cash provided by operating activities		73			57			95

Cash Flows From Investing Activities:
Capital expenditures		(46	)		(50	)		(57	)
Advances to money pool		-			16			7
Intercompany notes receivable - Genco		124			46			43
Net cash provided by (used in) investing activities		78			12			(7	)

Cash Flows From Financing Activities:
Dividends on common stock		(75	)		(62	)		(62	)
Dividends on preferred stock		(3	)		(3	)		(3	)
Changes in money pool borrowings		(53	)		121			-
Redemptions, repurchases, and maturities:
Long-term debt		(70	)		(95	)		(33	)
Preferred stock		-			(30	)		-
Issuances:
Long-term debt		35			-			-
Other		1			(1	)		1
Net cash used in financing activities		(165	)		(70	)		(97	)

Net change in cash and cash equivalents		(14	)		(1	)		(9	)
Cash and cash equivalents at beginning of year		16			17			26
Cash and cash equivalents at end of year	$	2		$	16		$	17

Cash Paid During the Periods:
Interest	$	33		$	36		$	40
Income taxes, net		26			38			14

The accompanying notes as they relate to CIPS are an integral part of these financial statements.

CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
STATEMENT OF STOCKHOLDERS' EQUITY
(In millions)

	December 31,
	2004			2003			2002
Common Stock	$	-		$	-		$	-

Other Paid-in Capital
Beginning of year		120			120			120
Equity contribution from parent		1			-			-
Other paid-in capital, end of year		121			120			120

Preferred Stock Not Subject to Mandatory Redemption:
Beginning of year		50			80			80
Redemptions		-			(30	)		-
Preferred stock not subject to mandatory redemption, end of year		50			50			80

Retained Earnings:
Beginning of year		369			405			444
Net income		32			29			26
Common stock dividends		(75	)		(62	)		(62	)
Preferred stock dividends		(3	)		(3	)		(3	)
Retained earnings, end of year		323			369			405

Accumulated Other Comprehensive Income (Loss):
Derivative financial instruments, beginning of year		-			-			-
Change in derivative financial instruments		4			-			-
Derivative financial instruments, end of year		4			-			-
Minimum pension liability, beginning of year		(7	)		(13	)		-
Change in minimum pension liability		(1	)		6			(13	)
Minimum pension liability, end of year		(8	)		(7	)		(13	)
Total accumulated other comprehensive loss, end of year		(4	)		(7	)		(13	)

Total Stockholders' Equity	$	490		$	532		$	592


Comprehensive Income, Net of Taxes:
Net income	$	32		$	29		$	26
Unrealized net gain on derivative hedging instruments,
net of income taxes of $2, $-, and $-, respectively		4			-			-
Minimum pension liability adjustment, net of income taxes
(benefit) of $-, $4, and $(9), respectively		(1	)		6			(13	)
Total comprehensive income, net of taxes	$	35		$	35		$	13


The accompanying notes as they relate to CIPS are an integral part of these financial statements.

AMEREN ENERGY GENERATING COMPANY
CONSOLIDATED STATEMENT OF INCOME
(In millions)



	Year Ended December 31,
	2004		2003			2002
Operating Revenues:
Electric	$	876	$	788		$	743
Total operating revenues		876		788			743

Operating Expenses:
Fuel and purchased power		380		353			351
Other operations and maintenance		136		142			163
Voluntary retirement and other restructuring charges		-		-			10
Depreciation and amortization		76		75			69
Taxes other than income taxes		19		21			12
Total operating expenses		611		591			605

Operating Income		265		197			138

Other Income and (Deductions):
Miscellaneous expense		-		(1	)		-
Total other income and (deductions)		-		(1	)		-

Interest Charges		94		101			86

Income Before Income Taxes and Cumulative Effect of Change
in Accounting Principle		171		95			52

Income Taxes		64		38			20

Income Before Cumulative Effect of Change in Accounting
Principle		107		57			32

Cumulative Effect of Change in Accounting Principle,
Net of Income Taxes of $-, $12, and $-		-		18			-

Net Income	$	107	$	75		$	32


The accompanying notes as they relate to Genco are an integral part of these consolidated financial statements.

AMEREN ENERGY GENERATING COMPANY
CONSOLIDATED BALANCE SHEET
(In millions, except shares)

	December 31,			December 31,
	2004			2003
ASSETS
Current Assets:
Cash and cash equivalents	$	1		$	2
Accounts receivable		96			88
Materials and supplies		89			90
Other current assets		2			4
Total current assets		188			184
Property and Plant, Net		1,749			1,774
Other Noncurrent Assets		18			19
TOTAL ASSETS	$	1,955		$	1,977


LIABILITIES AND STOCKHOLDER'S EQUITY
Current Liabilities:
Current maturities of long-term debt	$	225		$	-
Current portion of intercompany notes payable - CIPS and Ameren		283			53
Borrowings from money pool		116			124
Accounts and wages payable		54			75
Current portion of intercompany tax payable - CIPS		11			12
Taxes accrued		35			30
Other current liabilities		22			23
Total current liabilities		746			317
Long-term Debt, Net		473			698
Intercompany Notes Payable - CIPS and Ameren		-			358
Deferred Credits and Other Noncurrent Liabilities:
Accumulated deferred income taxes, net		144			99
Accumulated deferred investment tax credits		12			13
Intercompany tax payable - CIPS		138			150
Accrued pension and other postretirement benefits		5			19
Other deferred credits and liabilities		2			2
Total deferred credits and other noncurrent liabilities		301			283
Commitments and Contingencies (Note 1, 3 and 15)
Stockholder's Equity:
Common stock, no par value, 10,000 shares authorized - 2,000 shares outstanding		-			-
Other paid-in capital		225			150
Retained earnings		211			170
Accumulated other comprehensive income (loss)		(1	)		1
Total stockholder's equity		435			321
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	$	1,955		$	1,977

The accompanying notes as they relate to Genco are an integral part of these consolidated financial statements.

AMEREN ENERGY GENERATING COMPANY
CONSOLIDATED STATEMENT OF CASH FLOWS
(In millions)



	Year Ended December 31,
	2004			2003			2002
Cash Flows From Operating Activities:
Net income	$	107		$	75		$	32
Adjustments to reconcile net income to net cash
provided by operating activities:
Cumulative effect of change in accounting principle		-			(18	)		-
Amortization of debt issuance costs and discounts		1			1			1
Depreciation and amortization		76			75			69
Deferred income taxes, net		60			30			63
Deferred investment tax credits, net		(1	)		(2	)		(2	)
Voluntary retirement and other restructuring charges		-			(2	)		10
Pension contribution		(29	)		(3	)		(4	)
Other		(2	)		-			-
Changes in assets and liabilities:
Accounts receivable		(8	)		(10	)		49
Materials and supplies		1			(13	)		(17	)
Taxes accrued, net		5			89			(39	)
Accounts and wages payable		(17	)		(9	)		(37	)
Assets, other		1			(2	)		(6	)
Liabilities, other		(14	)		-			(11	)
Net cash provided by operating activities		180			211			108

Cash Flows From Investing Activities:
Capital expenditures		(50	)		(58	)		(442	)
Net cash used in investing activities		(50	)		(58	)		(442	)

Cash Flows From Financing Activities:
Dividends on common stock		(66	)		(36	)		(21	)
Debt issuance costs		-			-			(4	)
Changes in money pool borrowings		(8	)		(67	)		129
Redemptions, repurchases, and maturities:
Intercompany notes payable - CIPS and Ameren		(128	)		(51	)		(46	)
Issuances:
Long-term debt		-			-			275
Capital contribution from parent		75			-			-
Other		(4	)		-			2
Net cash provided by (used in) financing activities		(131	)		(154	)		335

Net change in cash and cash equivalents		(1	)		(1	)		1
Cash and cash equivalents at beginning of year		2			3			2
Cash and cash equivalents at end of year	$	1		$	2		$	3

Cash Paid During the Periods:
Interest	$	95		$	99		$	83
Income taxes paid (refunded)		1			(76	)		1


The accompanying notes as they relate to Genco are an integral part of these consolidated financial statements.

AMEREN ENERGY GENERATING COMPANY
CONSOLIDATED STATEMENT OF STOCKHOLDER'S EQUITY
(In millions)



	December 31,
	2004			2003			2002
Common Stock	$	-		$	-		$	-

Other Paid-in Capital:
Beginning of year		150			150			150
Equity contribution from Ameren		75			-			-
Other paid-in capital, end of year		225			150			150

Retained Earnings:
Beginning of year		170			131			120
Net income		107			75			32
Common stock dividends		(66	)		(36	)		(21	)
Retained earnings, end of year		211			170			131

Accumulated Other Comprehensive Income (Loss):
Derivative financial instruments, beginning of year		5			5			4
Change in derivative financial instruments		(2	)		-			1
Derivative financial instruments, end of year		3			5			5
Minimum pension liability, beginning of year		(4	)		(6	)		-
Change in minimum pension liability		-			2			(6	)
Minimum pension liability, end of year		(4	)		(4	)		(6	)
Total accumulated other comprehensive income (loss), end of year		(1	)		1			(1	)

Total Stockholder's Equity	$	435		$	321		$	280


Comprehensive Income, Net of Taxes:
Net income	$	107		$	75		$	32
Reclassification adjustments for (gains) losses included in net income
net of income taxes (benefit) of $(1), $-, and $1, respectively		(2	)		-			1
Minimum pension liability adjustment, net of income taxes
(benefit) of $-, $1, and $(3), respectively		-			2			(6	)
Total comprehensive income, net of taxes	$	105		$	77		$	27


The accompanying notes as they relate to Genco are an integral part of these consolidated financial statements.

CILCORP INC.
CONSOLIDATED STATEMENT OF INCOME
(In millions)


	--------------------------Successor------------------------						----------------------Predecessor------------------------
	Twelve			Eleven					Twelve
	Months			Months					Months
	Ended			Ended					Ended
	December 31,			December 31,			January		December 31,
	2004			2003			2003		2002
Operating Revenues:
Electric	$	391		$	512		$	49	$	519
Gas		326			303			58		268
Other		5			4			-		3
Total operating revenues		722			819			107		790

Operating Expenses:
Fuel and purchased power		146			276			26		247
Gas purchased for resale		231			230			44		184
Other operations and maintenance		190			135			14		148
Depreciation and amortization		69			72			6		72
Taxes other than income taxes		25			34			4		41
Total operating expenses		661			747			94		692

Operating Income		61			72			13		98

Other Income and (Deductions):
Miscellaneous income		1			1			-		3
Miscellaneous expense		(5	)		(3	)		-		(2	)
Total other income and (deductions)		(4	)		(2	)		-		1

Interest Charges and Preferred Dividends:
Interest		53			48			5		65
Preferred dividends of subsidiaries		2			2			-		2
Net interest charges and preferred dividends		55			50			5		67

Income Before Income Taxes and Cumulative Effect
of Change in Accounting Principle		2			20			8		32

Income Tax Expense (Benefit)		(8	)		6			3		7

Income Before Cumulative Effect of Change in
Accounting Principle		10			14			5		25

Cumulative Effect of Change in Accounting Principle,
Net of Income Taxes of $-, $-, $2, and $-		-			-			4		-

Net Income	$	10		$	14		$	9	$	25


The accompanying notes as they relate to CILCORP are an integral part of these consolidated financial statements.

CILCORP INC.
CONSOLIDATED BALANCE SHEET
(In millions, except shares)


	--------------------------Successor------------------------
	December 31,			December 31,
	2004			2003
ASSETS
Current Assets:
Cash and cash equivalents	$	7		$	11
Accounts receivables - trade (less allowance for doubtful
accounts of $3 and $6, respectively)		46			59
Unbilled revenue		46			40
Miscellaneous accounts and notes receivable		9			16
Materials and supplies		134			154
Other current assets		19			5
Total current assets		261			285
Property and Plant, Net		1,179			1,127
Investments and Other Noncurrent Assets:
Investments in leveraged leases		113			118
Goodwill and other intangibles, net		559			567
Other assets		33			23
Total investments and other noncurrent assets		705			708
Regulatory Assets		11			16
TOTAL ASSETS	$	2,156		$	2,136

LIABILITIES AND STOCKHOLDER'S EQUITY
Current Liabilities:
Current maturities of long-term debt	$	16		$	100
Borrowings from money pool		166			145
Intercompany note payable - Ameren		72			46
Accounts and wages payable		99			108
Other current liabilities		58			38
Total current liabilities		411			437
Long-term Debt, Net		623			669
Preferred Stock of Subsidiary Subject to Mandatory Redemption		20			21
Deferred Credits and Other Noncurrent Liabilities:
Accumulated deferred income taxes, net		214			181
Accumulated deferred investment tax credits		10			11
Regulatory liabilities		38			24
Accrued pension and other postretirement benefits		242			259
Other deferred credits and liabilities		31			37
Total deferred credits and other noncurrent liabilities		535			512
Preferred Stock of Subsidiary Not Subject to Mandatory Redemption		19			19
Commitments and Contingencies (Notes 1, 3, and 15)
Stockholder's Equity
Common stock, no par value, 10,000 shares authorized - 1,000 shares outstanding		-			-
Other paid-in capital		565			490
Retained earnings (deficit)		(21	)		(13	)
Accumulated other comprehensive income		4			1
Total stockholder's equity		548			478
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	$	2,156		$	2,136

The accompanying notes as they relate to CILCORP are an integral part of these consolidated financial statements.

CILCORP INC.
CONSOLIDATED STATEMENT OF CASH FLOWS
(In millions)
	-------------------------Successor-------------------------						------------------------Predecessor----------------------
	Twelve			Eleven						Twelve
	Months			Months						Months
	Ended			Ended						Ended
	December 31,			December 31,			January			December 31,
	2004			2003			2003			2002
Cash Flows From Operating Activities:
Net income	$	10		$	14		$	9		$	25
Adjustments to reconcile net income to net cash
provided by operating activities:
Cumulative effect of change in accounting principle		-			-			(4	)		-
Depreciation and amortization		69			72			6			72
Amortization of debt issuance costs and premium/discounts		-			1			-			1
Deferred income taxes, net		44			4			(5	)		3
Deferred investment tax credits, net		(1	)		(2	)		-			(2	)
Pension contribution		(41	)		-			-			(1	)
Other		31			(3	)		-			(47	)
Changes in assets and liabilities:
Receivables, net		14			(4	)		(20	)		(4	)
Materials and supplies		20			(15	)		13			-
Accounts and wages payable		(9	)		(25	)		20			(1	)
Taxes accrued		(9	)		(5	)		11			(6	)
Assets, other		(19	)		17			6			(21	)
Liabilities, other		27			(15	)		(5	)		69
Net cash provided by operating activities		136			39			31			88

Cash Flows From Investing Activities:
Capital expenditures		(125	)		(71	)		(16	)		(124	)
Other		5			(9	)		1			4
Net cash used in investing activities		(120	)		(80	)		(15	)		(120	)

Cash Flows From Financing Activities:
Dividends on common stock		(18	)		(27	)		-			-
Changes in money pool borrowings		21			149			-			-
Redemptions, repurchases, and maturities:
Short-term debt		-			-			(10	)		(53	)
Long-term debt		(142	)		(153	)		-			(1	)
Preferred stock		(1	)		(1	)		-			-
Issuances:
Long-term debt		19			-			-			100
Intercompany note payable - Ameren		26			46			-			-
Capital contribution from parent		75			-			-			-
Net cash provided by (used in) financing activities		(20	)		14			(10	)		46

Net change in cash and cash equivalents		(4	)		(27	)		6			14
Cash and cash equivalents at beginning of period		11			38			32			18
Cash and cash equivalents at end of period	$	7		$	11		$	38		$	32

Cash Paid During the Periods:
Interest	$	39		$	35		$	5		$	71
Income taxes, net paid (refunded)		(40	)		15			-			21


The accompanying notes as they relate to CILCORP are an integral part of these consolidated financial statements.

CILCORP INC.
CONSOLIDATED STATEMENT OF STOCKHOLDER'S EQUITY
(In millions)


	--------------------------Successor------------------------						------------------------Predecessor----------------------
	Twelve			Eleven						Twelve
	Months			Months						Months
	Ended			Ended						Ended
	December 31,			December 31,			January			December 31,
	2004			2003			2003			2002
Common Stock	$	-		$	-		$	-		$	-

Other Paid-in Capital:
Beginning of period		490			519			519			519
Purchase accounting adjustments		-			(29	)		-			-
Capital contribution from parent		75			-			-			-
Other paid-in capital, end of period		565			490			519			519

Retained Earnings (Deficit):
Beginning of period		(13	)		44			35			10
Purchase accounting adjustments		-			(44	)		-			-
Net income		10			14			9			25
Common stock dividends		(18	)		(27	)		-			-
Retained earnings (deficit), end of period		(21	)		(13	)		44			35

Accumulated Other Comprehensive Income (Loss):
Derivative financial instruments, beginning of period		1			1			1			(2	)
Purchase accounting adjustments		-			(1	)		-			-
Change in derivative financial instruments		3			1			-			3
Derivative financial instruments, end of period		4			1			1			1
Minimum pension liability, beginning of period		-			(60	)		(60	)		(10	)
Purchase accounting adjustments		-			60			-			-
Change in minimum pension liability		-			-			-			(50	)
Minimum pension liability, end of period		-			-			(60	)		(60	)
Total accumulated other comprehensive income (loss), end of period		4			1			(59	)		(59	)

Total Stockholder's Equity	$	548		$	478		$	504		$	495


Comprehensive Income (Loss), Net of Taxes:
Net income	$	10		$	14		$	9		$	25
Unrealized net gain on derivative hedging instruments,
net of income taxes of $2, $1, $-, and $2, respectively		5			1			-			3
Reclassification adjustments for gains included in net income,
net of income taxes (benefit) of $(1), $-, $-, and $-, respectively		(2	)		-			-			-
Minimum pension liability adjustment, net of income taxes (benefit) of
$-, $-, $-, and $(34), respectively		-			-			-			(50	)
Total comprehensive income (loss), net of taxes	$	13		$	15		$	9		$	(22	)


The accompanying notes as they relate to CILCORP are an integral part of these consolidated financial statements.

CENTRAL ILLINOIS LIGHT COMPANY

CONSOLIDATED STATEMENT OF INCOME

(In millions)

Year Ended December 31,

2004

2003

2002

Operating Revenues:

Electric

$

391

$

561

$

519

Gas

297

278

212

Total operating revenues

688

839

731

Operating Expenses:

Fuel and purchased power

140

303

247

Gas purchased for resale

202

189

129

Other operations and maintenance

198

165

146

Acquisition integration costs

2

21

-

Depreciation and amortization

64

70

71

Taxes other than income taxes

24

38

41

Total operating expenses

630

786

634

Operating Income

58

53

97

Other Income and (Deductions):

Miscellaneous income

-

-

2

Miscellaneous expense

(5

)

(4

)

(2

)

Total other income and (deductions)

(5

)

(4

)

-

Interest Charges

15

16

21

Income Before Income Taxes and Cumulative Effect

of Change in Accounting Principle

38

33

76

Income Taxes

6

12

26

Income Before Cumulative Effect of Change

in Accounting Principle

32

21

50

Cumulative Effect of Change in Accounting Principle,

Net of Income Taxes of $-, $16, and $-

-

24

-

Net Income

32

45

50

Preferred Stock Dividends

2

2

2

Net Income Available to Common Stockholder

$

30

$

43

$

48

The accompanying notes as they relate to CILCO are an integral part of these consolidated financial statements.

CENTRAL ILLINOIS LIGHT COMPANY
CONSOLIDATED BALANCE SHEET
(In millions)

	December 31,			December 31,
		2004			2003
ASSETS
Current Assets:
Cash and cash equivalents	$	2		$	8
Accounts receivable - trade (less allowance for doubtful
accounts of $3 and $6, respectively)		46			57
Unbilled revenue		43			35
Miscellaneous accounts and notes receivable		11			14
Materials and supplies		68			69
Other current assets		6			5
Total current assets		176			188
Property and Plant, Net		1,165			1,101
Other Noncurrent Assets		29			19
Regulatory Assets		11			16
TOTAL ASSETS	$	1,381		$	1,324

LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
Current maturities of long-term debt	$	16		$	100
Borrowings from money pool		169			149
Accounts and wages payable		95			101
Taxes accrued		-			13
Other current liabilities		49			30
Total current liabilities		329			393
Long-term Debt, Net		122			138
Preferred Stock Subject to Mandatory Redemption		20			21
Deferred Credits and Other Noncurrent Liabilities:
Accumulated deferred income taxes, net		130			101
Accumulated deferred investment tax credits		10			11
Regulatory liabilities		176			167
Accrued pension and other postretirement benefits		131			128
Other deferred credits and liabilities		26			23
Total deferred credits and other noncurrent liabilities		473			430
Commitments and Contingencies (Notes 1, 3, and 15)
Stockholders' Equity:
Common stock, no par value, 20.0 shares authorized - 13.6 shares outstanding		-			-
Preferred stock not subject to mandatory redemption		19			19
Other paid-in capital		313			238
Retained earnings		115			95
Accumulated other comprehensive loss		(10	)		(10	)
Total stockholders' equity		437			342
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$	1,381		$	1,324

The accompanying notes as they relate to CILCO are an integral part of these consolidated financial statements.

CENTRAL ILLINOIS LIGHT COMPANY

CONSOLIDATED STATEMENT OF CASH FLOWS

(In millions)

Year Ended December 31,

2004

2003

2002

Cash Flows From Operating Activities:

Net income

$

32

$

45

$

50

Adjustments to reconcile net income to net cash

provided by operating activities:

Cumulative effect of change in accounting principle

-

(24

)

-

Depreciation and amortization

64

70

71

Amortization of debt issuance costs and premium/discounts

-

1

1

Deferred income taxes, net

42

(22

)

6

Deferred investment tax credits, net

(1

)

(2

)

(2

)

Acquisition integration costs

-

16

-

Pension contribution

(41

)

-

(1

)

Other

44

2

(26

)

Changes in assets and liabilities:

Receivables, net

6

(20

)

(5

)

Materials and supplies

1

(8

)

(1

)

Accounts and wages payable

(6

)

24

(14

)

Taxes accrued

(13

)

(5

)

(10

)

Assets, other

(6

)

1

2

Liabilities, other

15

25

38

Net cash provided by operating activities

137

103

109

Cash Flows From Investing Activities:

Capital expenditures

(125

)

(87

)

(124

)

Other

-

1

1

Net cash used in investing activities

(125

)

(86

)

(123

)

Cash Flows From Financing Activities:

Dividends on common stock

(10

)

(62

)

(40

)

Dividends on preferred stock

(2

)

(2

)

(2

)

Changes in money pool borrowings

20

149

-

Redemptions, repurchases, and maturities:

Short-term debt

-

(10

)

(33

)

Long-term debt

(119

)

(105

)

(1

)

Preferred stock

(1

)

(1

)

-

Issuances:

Long-term debt

19

-

100

Capital contribution from parent

75

-

-

Net cash provided by (used in) financing activities

(18

)

(31

)

24

Net change in cash and cash equivalents

(6

)

(14

)

10

Cash and cash equivalents at beginning of year

8

22

12

Cash and cash equivalents at end of year

$

2

$

8

$

22

Cash Paid During the Periods:

Interest

$

16

$

19

$

28

Income taxes, net paid (refunded)

(20

)

22

36

The accompanying notes as they relate to CILCO are an integral part of these consolidated financial statements.

CENTRAL ILLINOIS LIGHT COMPANY
CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY
(In millions)


	Year Ended December 31,
	2004			2003			2002
Common Stock	$	-		$	-		$	-

Preferred Stock Not Subject to Mandatory Redemption		19			19			19

Other Paid-in Capital:
Beginning of year		238			238			238
Capital contribution from parent		75			-			-
Other paid-in capital, end of year		313			238			238

Retained Earnings:
Beginning of year		95			114			106
Net income		32			45			50
Common stock dividends		(10	)		(62	)		(40	)
Preferred stock dividends		(2	)		(2	)		(2	)
Retained earnings, end of year		115			95			114

Accumulated Other Comprehensive Income (Loss):
Derivative financial instruments, beginning of year		3			1			(2	)
Change in derivative financial instruments		4			2			3
Derivative financial instruments, end of year		7			3			1
Minimum pension liability, beginning of year		(13	)		(30	)		(1	)
Change in minimum pension liability		(4	)		17			(29	)
Minimum pension liability, beginning of year		(17	)		(13	)		(30	)
Total accumulated other comprehensive loss, end of year		(10	)		(10	)		(29	)

Total Stockholders' Equity	$	437		$	342		$	342


Comprehensive Income, Net of Taxes:
Net income	$	32		$	45		$	50
Unrealized net gain on derivative hedging instruments,
net of income taxes of $2, $1, and $2, respectively		5			2			3
Reclassification adjustments for gains included in net income,
net of income taxes (benefit) of $(1), $-, and $-, respectively		(1	)		-			-
Minimum pension liability adjustment, net of income taxes
(benefit) of $(3), $11, and $(19), respectively		(4	)		17			(29	)
Total comprehensive income, net of taxes	$	32		$	64		$	24


The accompanying notes as they relate to CILCO are an integral part of these consolidated financial statements.

ILLINOIS POWER COMPANY

   CONSOLIDATED STATEMENT OF INCOME

   (In millions)



--------Successor-------

----------------------------------------Predecessor-----------------------------------------------

Three

Nine

Months

Months

Ended

Ended

Twelve Months Ended

December 31,

September 30,

December 31,

2004

2004

2003

2002

Operating Revenues:

Electric

$

229

$

832

$

1,102

$

1,146

Gas

150

328

466

372

Total operating revenues

379

1,160

1,568

1,518

Operating Expenses:

Purchased power

128

496

681

678

Gas purchased for resale

110

222

316

232

Other operations and maintenance

43

143

205

193

Depreciation and amortization

20

61

79

81

Amortization of regulatory assets

1

32

42

74

Taxes other than income taxes

15

52

67

57

Total operating expenses

317

1,006

1,390

1,315

Operating Income

62

154

178

203

Other Income and (Deductions):

Interest income from former affiliates

-

128

170

170

Miscellaneous income

1

16

13

15

Miscellaneous expense

-

(1

)

(4

)

(11

)

Total other income and (deductions)

1

143

179

174

Interest Charges

17

114

163

112

Income Before Income Taxes and Cumulative

Effect of Change in Accounting Principle

46

183

194

265

Income Taxes

18

71

75

104

Income Before Cumulative Effect of Change

in Accounting Principle

28

112

119

161

Cumulative Effect of Change in Accounting

Principle, Net of Income Taxes

-

-

(2

)

-

Net Income

28

112

117

161

Preferred Stock Dividends

1

2

2

2

Net Income Applicable to Common Stockholder

$

27

$

110

$

115

$

159

The accompanying notes as they relate to IP are an integral part of these consolidated financial statements.

ILLINOIS POWER COMPANY

CONSOLIDATED BALANCE SHEET

(In millions)

-------Successor------

-----Predecessor-----

December 31,

December 31,

2004

2003

ASSETS

Current Assets:

Cash and cash equivalents

$

5

$

17

Account receivables (less allowance for doubtful

accounts of $6 million and $6 million, respectively)

101

109

Unbilled revenue

98

82

Miscellaneous accounts and notes receivable

8

82

Advances to money pool

140

-

Materials and supplies

85

84

Other current assets

69

39

Total current assets

506

413

Property and Plant, Net

1,984

1,949

Investments and Other Noncurrent Assets:

Investment in IP SPT

7

6

Goodwill

320

-

Other assets

37

212

Accumulated deferred income taxes

65

-

Total investments and other noncurrent assets

429

218

Note Receivable from Former Affiliate

-

2,271

Regulatory Assets

198

208

TOTAL ASSETS

$

3,117

$

5,059

LIABILITIES AND STOCKHOLDERS’ EQUITY

Current Liabilities:

Current maturities of long-term debt

$

70

$

71

Current maturities of long-term debt to IP SPT

74

74

Accounts and wages payable

122

57

Taxes accrued

5

50

Other current liabilities

102

115

Total current liabilities

373

367

Long-term Debt, Net

713

1,435

Long-term Debt to IP SPT

278

345

Deferred Credits and Other Noncurrent Liabilities:

Accumulated deferred income taxes

-

1,011

Accumulated deferred investment tax credits

-

20

Regulatory liabilities

76

129

Accrued pension and other postretirement liabilities

248

39

Other deferred credits and other noncurrent liabilities

149

183

Total deferred credits and other non-current liabilities

473

1,382

Commitments and Contingencies (Notes 1, 3, and 15)

Stockholders’ Equity:

Common stock, no par value, 100.0 shares authorized -

shares outstanding of 23.0 and 75.6, respectively

-

-

Other paid-in-capital

1,207

1,276

Preferred stock, not subject to mandatory redemption

46

46

Treasury stock, at cost - 12.7 shares

-

(287

)

Retained earnings

27

505

Accumulated other comprehensive income (loss)

-

(10

)

Total stockholders’ equity

1,280

1,530

TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY

$

3,117

$

5,059

The accompanying notes as they relate to IP are an integral part of these consolidated financial statements.

ILLINOIS POWER COMPANY
CONSOLIDATED STATEMENT OF CASH FLOWS
(In millions)

	-------Successor--------			------------------------------------Predecessor---------------------------------------------
	Three			Nine
	Months			Months
	Ended			Ended			Twelve Months Ended
	December 31,			September 30,			December 31,
	2004			2004			2003			2002
Cash Flows From Operating Activities:
Net income	$	28		$	112		$	117		$	161
Adjustments to reconcile net income to net cash
provided by operating activities:
Cumulative effect of change in accounting principle		-			-			2			-
Depreciation and amortization		21			93			121			155
Amortization of debt issuance costs and premium/discounts		2			9			12			9
Deferred income taxes		98			(58	)		(24	)		(45	)
Deferred investment tax credits		-			(1	)		-			-
Other		(27	)		(3	)		(2	)		(2	)
Changes in assets and liabilities:
Receivables, net		(16	)		23			2			(22	)
Materials and supplies		(15	)		(13	)		(23	)		2
Accounts and wages payable		62			(2	)		(41	)		8
Assets, other		(25	)		13			(40	)		(3	)
Liabilities, other		(39	)		(15	)		4			(45	)
Net cash provided by operating activities		89			158			128			218

Cash Flows From Investing Activities:
Capital expenditures		(35	)		(100	)		(126	)		(144	)
Changes in money pool advances		(140	)		-			-			-
Other		(1	)		4			-			3
Net cash used in investing activities		(176	)		(96	)		(126	)		(141	)

Cash Flows From Financing Activities:
Dividends on preferred stock		(1	)		(2	)		(2	)		(3	)
Prepaid interest on Note Receivable from Former Affiliate		-			43			128			-
Redemptions, repurchases, and maturities:
Short-term debt		-			-			(100	)		(238	)
Long-term debt		(823	)		(65	)		(276	)		(182	)
Issuances:
Short-term debt		-			-			-			60
Long-term debt		-			-			150			400
Capital contribution from parent		871			-			-			-
Transitional funding trust notes overfunding		-			(4	)		(2	)		(5	)
Other		(6	)		-			-			(33	)
Net cash provided by (used in) financing activities		41			(28	)		(102	)		(1	)

Net change in cash and cash equivalents		(46	)		34			(100	)		76
Cash and cash equivalents at beginning of period		51			17			117			41
Cash and cash equivalents at end of year	$	5		$	51		$	17		$	117


Cash Paid During the Periods:
Interest	$	48		$	81		$	94		$	151
Income taxes, net paid (refunded)		(41	)		160			153			106

The accompanying notes as they relate to IP are an integral part of these consolidated financial statements.

ILLINOIS POWER COMPANY
CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY
(In millions)


	-------Successor--------			------------------------------------Predecessor---------------------------------------------
	Three			Nine
	Months			Months
	Ended			Ended			Twelve Months Ended
	December 31,			September 30,			December 31,
	2004			2004			2003			2002
Common Stock	$	-		$	-		$	-		$	-

Preferred Stock Not Subject to Mandatory Redemption		46			46			46			46

Other Paid-in Capital:
Beginning of period		344			1,276			1,276			1,276
Repurchase of common stock		-			(626	)		-			-
Purchase accounting adjustments		(8	)		(306	)		-			-
Equity contribution from parent		871			-			-			-
Other paid-in capital, end of period		1,207			344			1,276			1,276

Retained Earnings:
Beginning of period		-			505			390			233
Elimination of remaining Note Receivable from Former Affiliate		-			(457	)		-			-
Purchase accounting adjustments		-			(158	)		-			-
Net income		28			112			117			161
Preferred stock dividends and tender charges		(1	)		(2	)		(2	)		(4	)
Retained earnings, end of period		27			-			505			390

Accumulated Other Comprehensive Income (Loss):
Minimum pension liability, beginning of period		-			(10	)		(13	)		-
Assumption of deferred tax obligations by Former Affiliate		-			(5	)		-			-
Purchase accounting adjustments		-			14			-			-
Change in minimum pension liability		-			(1	)		3			(13	)
Accumulated other comprehensive loss, end of period		-			-			(10	)		(13	)

Treasury Stock
Beginning of period		-			(287	)		(287	)		(287	)
Purchase accounting adjustments		-			287			-			-
Treasury stock, end of period		-			-			(287	)		(287	)

Total Stockholders' Equity	$	1,280		$	390		$	1,530		$	1,412


Comprehensive Income, Net of Taxes:
Net income	$	28		$	112		$	117		$	161
Minimum pension liability adjustment, net of income taxes
(benefit) of $-, $-, $2, and $(9), respectively		-			1			4			(13	)
Total comprehensive income, net of taxes	$	28		$	113		$	121		$	148


The accompanying notes as they relate to IP are an integral part of these consolidated financial statements.

Environmental Costs

Environmental costs are recorded on an undiscounted basis when it is probable that a liability has been incurred and the amount of the liability can be reasonably estimated. Estimated environmental expenditures are based on internal and third-party estimates, which are regularly reviewed and updated. Costs are expensed or deferred as a regulatory asset when it is expected that the costs will be recovered from customers in future rates. If environmental expenditures are related to facilities currently in use, such as pollution control equipment, the cost is capitalized and depreciated over the expected life of the asset.

Unamortized Debt Discount, Premium and Expense

Discount, premium and expense associated with long-term debt are amortized over the lives of the related issues.

Revenue

Utility Revenues

Our utility operating companies (UE, CIPS, CILCO and IP) record operating revenue for electric and gas service when delivered to customers. We accrue an estimate of electric and gas revenues for service rendered, but unbilled, at the end of each accounting period.

Interchange Revenues

The following table presents the interchange revenues included in Operating Revenues - - Electric for the years ended December 31, 2004, 2003 and 2002:

	2004		2003		2002
Ameren^(a)(b)	$	404	$	351	$	259
UE		340		320		257
CIPS		37		37		35
Genco		163		140		99
CILCORP^(c)		46		19		10
CILCO		46		19		10
IP^(d)		-		-		7

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; excludes amounts for CILCORP prior to the acquisition date of January 31, 2003; and includes amounts for Ameren Registrant and non-Registrant subsidiaries and intercompany eliminations.

(b)	Includes interchange revenues at EEI of $53 million for the year ended December 31, 2004 (2003 - $56 million; 2002 - $59 million).

(c)	2002 amounts represent predecessor information. 2003 amounts include January 2003 predecessor information, which was $3 million. CILCORP consolidates CILCO and therefore includes CILCO amounts in its balances.

(d)	2002 and 2003 amounts represent predecessor information. 2004 amount includes January - September 2004 predecessor information which was less than $1 million.

Trading Activities

We present the revenues and costs associated with certain energy contracts designated as trading on a net basis in Operating Revenues - Electric and Other.

Purchased Power

The following table presents the purchased power expenses included in Operating Expenses - Fuel and Purchased Power for the years ended December 31, 2004, 2003 and 2002. See Note 14 - Related Party Transactions for further information on affiliate purchased power transactions.

	2004		2003		2002
Ameren^(a)	$	454	$	294	$	167
UE		203		179		229
CIPS		325		341		418
Genco		150		152		119
CILCORP^(b)		43		205		155
CILCO		43		202		155
IP^(c)		624		681		698

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; excludes amounts for CILCORP prior to the acquisition date of January 31, 2003; and includes amounts for Ameren Registrant and non-Registrant subsidiaries and intercompany eliminations.

(b)	2002 amounts represent predecessor information. 2003 amounts include January 2003 predecessor information, which was $12 million. CILCORP consolidates CILCO and therefore includes CILCO amounts in its balances.

(c)	2002 and 2003 amounts represent predecessor information. 2004 amount includes January - September 2004 predecessor information which was $496 million.

Fuel and Gas Costs

In UE’s, CIPS’, CILCO’s and IP’s retail electric utility jurisdictions, there are no provisions for adjusting rates in response to changes in the cost of fuel for electric generation. In UE’s, CIPS’, CILCO’s and IP’s retail gas utility jurisdictions, changes in gas costs are generally reflected in billings to gas customers through PGA clauses.

UE’s cost of nuclear fuel is amortized to fuel expense on a unit-of-production basis. Spent fuel disposal cost, based on net kilowatthours generated and sold, is charged to expense.

Stock-based Compensation

Effective January 1, 2003, Ameren adopted the fair value recognition provisions of SFAS No. 123, “Accounting for Stock-based Compensation,” by using the prospective method of adoption under SFAS No. 148, “Accounting for Stock-based Compensation - - Transition and Disclosure,” for all employee awards granted or with terms modified on or after January 1, 2003.

Prior to 2003, Ameren, CILCORP and IP accounted for stock options granted under long-term incentive plans under the recognition and measurement provisions of APB Opinion No. 25, “Accounting for Stock Issued to Employees.” No stock-based employee compensation cost was recognized for options granted under Ameren’s plan, either under the AES Stock Option Plan in which CILCORP’s employees participated or under the equity compensation plans of Dynegy in which IP employees participated, as all options granted under the plans had an exercise price equal to the market value of the underlying common stock on the date of grant.

Effective January 1, 2003, predecessor IP adopted the fair value recognition provisions of SFAS No. 123, with respect to options granted to its employees under Dynegy’s plans, by using the prospective method of adoption under SFAS No. 148. As a result, all stock options granted after January 1, 2003, were accounted for on a fair value basis. IP incurred compensation expense over the vesting period of the options in an amount equal to the fair value of the options. On October 1, 2004, as a result of Ameren’s acquisition of IP, all unvested stock options granted to IP employees became null and void.

In December 2004, the FASB issued SFAS No. 123 (as revised SFAS No. 123R), “Share Based Payment,” which revises SFAS No. 123 and supersedes APB Opinion No. 25. SFAS No. 123R will require companies to measure the cost of employee services received in exchange for an award of equity instruments based on the grant-date fair value of the award. The fair value of the award will be remeasured subsequently at each reporting date through the settlement date; the changes in fair value will be recognized as compensation cost in each period. The fair-value based method in this statement is similar to the fair-value based method in SFAS No. 123 in most respects. SFAS No. 123R is effective for Ameren for the quarterly period ending September 30, 2005. The statement applies to all awards granted or modified after the effective date. The adoption of this statement is not expected to have a material adverse impact on our results of operations, financial position, or liquidity upon adoption.

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Had compensation cost for all stock options and stock awards granted prior to 2003 been determined on a fair-value basis consistent with SFAS No. 123, net income would have approximated the following pro forma amounts for the years ended December 31, 2004, 2003 and 2002, respectively.


	Year Ended December 31,
Ameren^(a⁾	2004		2003		2002
Net income as reported	$	530	$	524	$	382
Add: Stock-based employee compensation expense included in reported net income, net of related tax effects^(a)		3		3		2
Deduct: Total stock-based employee compensation expense determined under fair-value based method for all awards, net of related tax effects		4		4		3
Pro forma net income	$	529	$	523	$	381
Basic earnings per share as reported	$	2.84	$	3.25	$	2.61
Basic earnings per share pro forma		2.84		3.25		2.61
Diluted earnings per share as reported		2.84		3.25		2.60
Diluted earnings per share pro forma		2.84		3.24		2.60

	Predecessor
	Year Ended December 31,
CILCORP^(a)		2002^(a)
Net income as reported		$	25
Add: Stock-based employee compensation expense included in reported net income, net of related tax effects^(a)			-
Deduct: Total stock-based employee compensation expense determined under fair-value based method for all awards, net of related tax effects			2
Pro forma net income		$	23

	Predecessor
	Year Ended December 31,
IP^(a)	January 1, 2004 to September 30, 2004		2003		2002
Net income as reported	$	112	$	117	$	161
Add: Stock-based employee compensation expense included in reported net income, net of related tax effects^(a)		-		-		-
Deduct: Total stock-based employee compensation expense determined under fair-value based method for all awards, net of related tax effects		3		4		4
Pro forma net income	$	109	$	113	$	157

(a)

Ameren and CILCORP have not granted stock options after January 1, 2003. CILCORP information subsequent to 2002 is not presented, as all CILCORP options were either paid out or assumed by AES in connection with Ameren’s acquisition of CILCORP. For IP, compensation expense recorded for stock options granted after January 1, 2003, was negligible for the nine months ended September 30, 2004, and the years ended December 31, 2003 and 2002. On October 1, 2004, as a result of Ameren’s acquisition of IP, all unvested stock options granted to IP employees became null and void. Therefore, information subsequent to September 30, 2004 is not presented.

See Note 12 - Stock-based Compensation for further information.

Excise Taxes

Excise taxes reflected on Missouri electric, Missouri gas, and Illinois gas customer bills are imposed on us. They are

recorded gross in Operating Revenues and Taxes Other than Income Taxes. Excise taxes reflected on Illinois electric customer bills are imposed on the consumer. They are recorded as tax collections payable and included in Taxes Accrued. The following table presents excise taxes recorded in Operating Revenues and Taxes Other than Income Taxes for the years ended 2004, 2003 and 2002:


	2004		2003		2002
Ameren^(a)	$	134	$	137	$	116
UE		103		101		103
CIPS		13		14		13
Genco		-		-		-
CILCORP^(b)		12		24		16
CILCO^(c)		12		24		16
IP^(d)		36		40		41

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; and excludes amounts for CILCORP and CILCO prior to the acquisition date of January 31, 2003.

(b)	2002 amounts represent predecessor information. 2003 amounts include January 2003 predecessor information, which was $2 million. CILCORP consolidates CILCO and therefore includes CILCO amounts in its balances.

(c)	With the exception of taxes reflected on CILCO customer bills issued prior to October 27, 2003, excise taxes at CILCO are recorded as tax collections payable and are included on the Balance Sheet as Taxes Accrued.

(d)	2002 and 2003 amounts represent predecessor information. 2004 amount includes January - September 2004 predecessor information, which was $30 million.

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Income Taxes

Ameren uses an asset and liability approach for its financial accounting and reporting of income taxes, in accordance with the provisions of SFAS No. 109 “Accounting for Income Taxes.” Deferred tax assets and liabilities are recognized for transactions that are treated differently for financial reporting and tax return purposes. These deferred tax assets and liabilities are determined by statutory enacted tax rates.

We recognize that regulators will probably reduce future revenues for deferred tax liabilities initially recorded at rates in excess of the current statutory rate. Therefore, reductions in the deferred tax liability, which were recorded due to decreases in the statutory rate, were credited to a regulatory liability. A regulatory asset has been established to recognize the probable future recovery in rates of future income taxes resulting principally from the reversal of Allowance for Funds Used During Construction - Equity and temporary differences related to property, plant, and equipment acquired before 1976, which were an unrecognized temporary difference prior to the adoption of SFAS 109.

Investment tax credits used on tax returns of prior years have been deferred for book purposes; they are being amortized over the useful lives of the related properties. Deferred income taxes were recorded on the temporary difference represented by the deferred investment tax credits and a corresponding regulatory liability, which recognizes the expected reduction in rate revenue for future lower income taxes associated with the amortization of the investment tax credits, was recorded. See Note 13 - Income Taxes for the treatment of IP’s unamortized investment tax credits and deferred tax liabilities upon the acquisition of IP by Ameren.

Earnings Per Share

There were no differences between the basic and diluted earnings per share amounts for Ameren in 2004 and 2003. The inclusion of assumed stock option conversions in the calculation of earnings per share resulted in dilution of $0.01 per share for 2002. The assumed stock option conversions increased the number of shares outstanding in the diluted earnings per share calculation by 196,709 shares in 2004, 289,244 shares in 2003 and 332,909 shares in 2002. As only the Ameren parent company has publicly held common stock, earnings per share calculations are not relevant, so they are not presented for any of the other Ameren Companies.

Accounting Changes and Other Matters

SFAS No.143 - “Accounting for Asset Retirement Obligations”

We adopted the provisions of SFAS No. 143, effective January 1, 2003. SFAS No. 143 provides the accounting requirements for asset retirement obligations associated with tangible, long-lived assets. SFAS No. 143 requires us to record the estimated fair value of legal obligations associated with the retirement of tangible long-lived assets in the period in which the liabilities are incurred and to capitalize a corresponding amount as part of the book value of the related long-lived asset. In subsequent periods, we are required to make adjustments in asset retirement obligations based on changes in estimated fair value. Corresponding increases in asset book values are depreciated over the remaining useful life of the related asset. Uncertainties as to the probability, timing or amount of cash flows associated with an asset retirement obligation affect our estimates of fair value.

Upon adoption of the standard, Ameren and Genco recognized a net after-tax gain of $18 million in the first quarter of 2003 for the cumulative effect of change in accounting principle. Prior to Ameren’s acquisition of CILCORP, predecessor CILCORP and CILCO recognized a net after-tax gain in 2003 of $4 million and $24 million, respectively, for the cumulative effect of change in accounting principle. In addition, in accordance with SFAS No. 143, estimated net future removal costs associated with Ameren’s, UE’s, CIPS’, CILCORP’s and CILCO’s rate-regulated operations that had previously been embedded in accumulated depreciation were reclassified as a regulatory liability.

Prior to Ameren’s acquisition of IP, predecessor IP recognized a net after-tax loss upon adoption of SFAS No. 143 of $2 million for the cumulative effect of change in accounting principle. At January 1, 2004, IP’s asset retirement obligation liability totaled $1 million for obligations under an operating lease. This asset retirement obligation related to the dismantling of the generation plant and remediation of the plant site at Tilton, Illinois, which IP had leased to DMG. In July 2004, IP sold the Tilton assets to DMG and eliminated the related asset retirement obligation liability as part of the accounting for that transaction. Thus, IP had no asset retirement obligation liabilities recorded at December 31, 2004.

Upon adoption of SFAS No. 143, UE recorded asset retirement obligations related to UE’s Callaway nuclear plant decommissioning costs and to retirement costs for a UE river structure. Additionally, Genco recorded an asset retirement obligation for the retirement costs for a Genco power plant ash pond. CILCORP and CILCO recorded asset retirement obligations related to CILCO’s power plant ash ponds (now owned by AERG).

Asset retirement obligations at Ameren and UE increased by $24 million for the year ended December 31, 2004, to reflect the accretion of obligations to their present value. Increases to Genco’s, CILCORP’s and CILCO’s asset retirement obligations due to accretion were immaterial during this period. Substantially all of this accretion was recorded as an increase to regulatory assets. Additionally, Ameren and CILCO’s asset retirement obligations increased by approximately $2 million during the year ended December 31, 2004, due to revisions in estimated future cash flows to retire CILCO’s ash ponds.

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In addition to those obligations that have been identified and valued, we determined that certain other asset retirement obligations exist. However, we were unable to estimate the fair value of those obligations because the probability, timing, or cash flows associated with the obligations were indeterminable. We do not believe that these obligations, when incurred, will have a material adverse impact on our results of operations, financial position, or liquidity.

The fair value of the nuclear decommissioning trust fund for UE’s Callaway nuclear plant is reported in Nuclear Decommissioning Trust Fund in Ameren’s and UE’s Consolidated Balance Sheets. This amount is legally restricted: It may be used only to fund the costs of nuclear decommissioning. Changes in the fair value of the trust fund are recorded as an increase or decrease to the regulatory asset recorded in connection with the adoption of SFAS No. 143.

In June 2004, the FASB issued an exposure draft on a proposed interpretation of SFAS No. 143. The FASB is expected to issue a final interpretation in the first quarter of 2005. Under the interpretation, a legal obligation to perform an asset retirement activity that is conditional on a future event is within the scope of SFAS No. 143. Accordingly, an entity would be required to recognize a liability for the fair value of an asset retirement obligation that is conditional on a future event if the liability's fair value can be estimated reasonably. The exposure draft provides examples of conditional asset retirement obligations that may need to be recognized under the provisions of the interpretation, including asbestos removal. This proposed interpretation could require accrual of additional liabilities by Ameren and its subsidiaries and could result in increased expense, which, while not yet quantified, could be material. This proposed interpretation would be effective for us no later than December 31, 2005, if issued in its current form.

FIN No. 46 - “Consolidation of Variable-interest Entities”

In January 2003, the FASB issued FIN No. 46, which changed the consolidation requirements for special-purpose entities (SPEs) and non-special-purpose entities (non-SPEs) that meet the criteria for designation as variable-interest entities (VIEs). In December 2003, the FASB revised FIN No. 46 (FIN No. 46R) to clarify certain aspects of FIN No. 46 and to modify the effective dates of the new guidance. FIN No. 46R provides guidance on the accounting for entities that are controlled through means other than voting rights by another entity. FIN No. 46R requires a VIE to be consolidated by a company if that company is designated as the primary beneficiary.

The Ameren Companies do not have any interests in entities that are considered SPEs, other than IP's investment in IP LLC. FIN No. 46R was effective on March 31, 2004, for any interests the Ameren Companies held in non-SPEs. The adoption of FIN No. 46R did not have a material impact on the consolidated financial statements of the Ameren Companies. However, in connection with the adoption of FIN No. 46R, we have determined that the following significant variable-interests are held by the Ameren Companies:

EEI. Ameren has an 80% ownership interest in EEI through UE’s 40% interest and Resources Company’s 40% interest. Under the FIN No. 46R model, Ameren, UE, and Resources Company have a variable-interest in EEI, and Ameren is the primary beneficiary. Accordingly, Ameren will continue to consolidate EEI, and UE will continue to account for its investment in EEI under the equity method of accounting. The maximum exposure to loss as a result of these variable-interests in EEI is limited to Ameren’s, UE’s, and Resources Company’s equity investments in EEI.

Tolling agreement. CILCO has a variable-interest in Medina Valley through a tolling agreement to purchase steam, chilled water, and electricity. We have concluded that CILCO is not the primary beneficiary of Medina Valley. Accordingly, CILCO does not consolidate Medina Valley. The maximum exposure to loss as a result of this variable-interest in the tolling agreement is not material.

Leveraged lease and affordable housing partnership investments. Ameren, UE and CILCORP have investments in leveraged lease and affordable housing partnership arrangements that are variable-interests. We have concluded that none of these companies is a primary beneficiary of any of the VIEs related to these investments. The maximum exposure to loss as a result of these variable-interests is limited to the investments in these arrangements. At December 31, 2004, Ameren and CILCORP had net investments in leveraged leases of $140 million and $113 million, respectively. At December 31, 2004, Ameren, UE, and CILCORP had investments in affordable housing partnerships of $19 million, $6 million, and $7 million, respectively.

IP SPT. Ameren acquired a variable-interest in IP SPT with the acquisition of IP on September 30, 2004. IP has a variable-interest in IP SPT, which was established in 1998 to issue TFNs. IP has indemnified and is liable to IP SPT if IP does not bill the applicable charges to its customers on behalf of IP SPT or if it does not remit the collection to IP SPT; however, the note holders are considered the primary beneficiaries of this special-purpose trust. Accordingly, Ameren and IP do not consolidate IP SPT.

FASB Staff Position SFAS No. 106-1 and FASB Staff Position SFAS No. 106-2 - “Accounting and Disclosure Requirements Related to the Medicare Prescription Drug, Improvement and Modernization Act of 2003”

On December 8, 2003, the Medicare Prescription Drug, Improvement and Modernization Act of 2003 (the Medicare

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Prescription Drug Act) became law. The Medicare Prescription Drug Act introduced a prescription drug benefit for retirees under Medicare as well as a federal subsidy for sponsors of retiree health care benefit plans that provide a benefit that is at least actuarially equivalent to the Medicare prescription drug benefit. Through its postretirement benefit plans, Ameren provides retirees with prescription drug coverage that we believe is actuarially equivalent to the Medicare prescription drug benefit. In January 2004, the FASB issued FSP SFAS 106-1, which permitted a plan sponsor of a postretirement health care plan that provides a prescription drug benefit to make a one-time election to defer the accounting for the effects of the Medicare Prescription Drug Act. We made this one-time election allowed by FSP SFAS 106-1.

In May 2004, the FASB issued FSP SFAS 106-2, which superseded FSP SFAS 106-1. FSP SFAS 106-2 provides guidance on accounting for the effects of the Medicare Prescription Drug Act for employers whose prescription drug benefits are actuarially equivalent to the drug benefit under Medicare Part D. Ameren elected to adopt FSP SFAS 106-2 during the second quarter ended June 30, 2004, retroactive to January 1, 2004. See Note 11 - Retirement Benefits for additional information on the impact of adoption of FSP SFAS 106-2.

Predecessor IP’s adoption of FSP SFAS 106-2 on July 1, 2004, had no impact on IP’s results of operations, financial position or liquidity because its drug benefit was not actuarially equivalent to the drug benefit under Medicare Part D.

EITF Issue No. 03-1, “The Meaning of Other-Than-Temporary Impairment and Its Application to Certain Investments”

In March 2004, the EITF reached a consensus on EITF Issue No. 03-1, which provides guidance on evaluating whether an investment is other-than-temporarily impaired. The recognition and measurement provisions of EITF 03-1, which were to be effective for periods beginning after June 15, 2004, were delayed by the issuance of FSP EITF 03-1, “Effective Date of Paragraphs 10-20 of EITF Issue No. 03-1, ‘The Meaning of Other-Than-Temporary Impairment and Its Application to Certain Investments,’ ” in September 2004. During the period of delay, we will continue to evaluate our investments, which primarily constitute our Nuclear Decommissioning Trust Fund, as required by existing authoritative guidance.

NOTE 2 - ACQUISITIONS

IP and EEI

On September 30, 2004, Ameren completed the acquisition of all the common stock and 662,924 shares of preferred stock of IP (based in Decatur, Illinois) and an additional 20% ownership interest in EEI from Dynegy and its subsidiaries. Ameren acquired IP to complement its existing Illinois gas and electric operations. The purchase included IP’s rate-regulated electric and natural gas transmission and distribution business serving 600,000 electric and 415,000 gas customers in areas contiguous to our existing Illinois utility service territories. With the acquisition, IP became an Ameren subsidiary operating as AmerenIP. For a discussion of the regulatory agency approvals granted in connection with this acquisition, see Note 3 - Rate and Regulatory Matters.

The total transaction value was $2.3 billion, including the assumption of $1.8 billion of IP debt and preferred stock and consideration, including transaction costs, of $443 million in cash, net of $51 million cash acquired. In February 2005, Ameren received $5 million from Dynegy representing the final working capital adjustment pursuant to the terms of the stock purchase agreement. Ameren placed $100 million of the cash portion of the purchase price in a six-year escrow account pending resolution of certain contingent environmental obligations of IP and other Dynegy affiliates for which Ameren has been provided indemnification by Dynegy. See Note 15 - Commitments and Contingencies for information on the IP environmental matter to which the indemnification and escrow applies. In addition, this transaction included a fixed-price capacity power supply agreement for IP’s annual purchase in 2005 and 2006 of 2,800 megawatts of electricity from DYPM. The contract was marked to fair value at closing of the acquisition. This agreement is expected to supply about 70% of IP’s electric customer requirements during those two years. The remaining 30% of IP’s power needs in 2005 and 2006 will be supplied by other companies. In the event that any of these suppliers are unable to supply the electricity required by these agreements, IP would be forced to find alternative suppliers to meet its load requirements, thus exposing itself to market price risk, which could have a material impact on Ameren’s and IP’s results of operations, financial position, or liquidity.

Ameren’s financing plan for funding this acquisition included the issuance of new Ameren common stock. Ameren issued an aggregate of 30 million common shares in February 2004 and July 2004, which generated net proceeds of $1.3 billion. Proceeds from these issuances were used to finance the cash portion of the purchase price and to reduce IP debt assumed as part of this transaction and to pay related premiums. See Note 6 - Long-term Debt and Equity Financings for information on redemptions and repurchases of certain IP indebtedness after the acquisition.

The following table presents the estimated fair values of the assets acquired and liabilities assumed at the date of Ameren’s acquisition of IP and the additional 20% ownership interest in EEI. Ameren is completing its valuations of the net assets and liabilities of IP and EEI acquired, including third-party valuations of property and plant, intangible assets, pension and other postretirement benefit obligations, and contingent obligations. As a result, the allocation of the purchase price is preliminary and subject to further adjustment. We expect to finalize purchase accounting in 2005. The fair value of IP’s

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power supply agreements including the fixed-price capacity power supply agreement with DYPM, discussed above recorded at the acquisition date resulted in a net liability of $109 million. In addition, we recorded a fair value adjustment, resulting in a net asset of $24 million, for IP’s power supply agreement with EEI that expires at the end of 2006. The excess of the purchase price for IP’s common stock and preferred stock over tangible net assets acquired has been allocated preliminarily to goodwill in the amount of $320 million, net of future tax benefits. For income tax purposes, we expect that a portion of the purchase price will be allocated to goodwill and that such portion will be deducted ratably over a 15-year period. No specifically identifiable intangible assets have been identified.


Current assets	$	374
Property and plant		1,967
Investments and other noncurrent assets		387
Goodwill		320
Total assets acquired		3,048
Current liabilities		234
Long-term debt, including current maturities		1,982
Other noncurrent liabilities		450
Total liabilities assumed		2,666
Preferred stock assumed		13
Net assets acquired	$	369

The following unaudited pro forma financial information presents a summary of Ameren’s consolidated results of operations for the years ended December 31, 2004 and 2003, as if the acquisition of IP had been completed at the beginning of 2003, including pro forma adjustments, which are based upon preliminary estimates, to reflect the allocation of the purchase price to the acquired net assets. The pro forma financial information does not include cost savings that may result from the combination of Ameren with IP.


For the years ended December 31,	2004		2003
Operating revenues	$	6,320	$	6,123
Income before cumulative effect of change in accounting principle		677		663
Cumulative effect of change in accounting principle, net of taxes		-		16
Net income	$	677	$	679
Earnings per share - basic	$	3.49	$	3.55
- diluted	$	3.48	$	3.55

This pro forma information is not necessarily indicative of the results of operations as they would have been had the transaction been effected on the assumed date, nor is it an indication of trends for future results.

IP’s Note Receivable from Former Affiliate of $2.3 billion was eliminated as of September 30, 2004, and prior to Ameren’s acquisition of IP to meet the conditions of the closing. Steps to eliminate the Note were made: (1) reducing the principal balance by offsetting certain payables owed by IP to Illinova and other Dynegy entities; (2) offsetting the principal balance by the amount of interest that had been paid by Illinova to IP, but not yet earned; and (3) eliminating a portion in consideration of Illinova’s assumption of IP’s net deferred tax obligation and IP’s contemporaneous repurchase (and cancellation immediately thereafter) of 39,892,213 of IP common shares. The 12,751,724 IP treasury shares held as of December 31, 2003, were canceled in 2004. The remaining principal balance of IP’s Note Receivable from Former Affiliate was eliminated, as part of IP’s overall recapitalization, with a corresponding reduction to IP’s retained earnings. The elimination of IP’s Note Receivable from Former Affiliate had no impact on IP’s predecessor results of operations.

The portion of the total transaction value attributable to Ameren’s acquisition of Dynegy’s 20% ownership interest in EEI now held by Resources Company was $125 million. This transaction was accounted for as a step acquisition. The excess of the purchase price for this ownership interest over 20% of the fair value of EEI’s net assets acquired has been preliminarily allocated to property and plant ($80 million) and emission allowances ($41 million), partially offset by a net liability for power supply agreements ($24 million) and a reduction to net deferred tax assets ($38 million). The remaining excess was allocated to goodwill in the amount of $54 million, subject to change based on our final valuation.

CILCORP and Medina Valley

On January 31, 2003, Ameren completed the acquisition of all of the outstanding common stock of CILCORP from AES. CILCORP is the parent company of CILCO (based in Peoria, Illinois). With the acquisition, CILCO became an indirect Ameren subsidiary, but it remains a separate utility company, operating as AmerenCILCO. On February 4, 2003, Ameren also completed the acquisition from AES of Medina Valley, which indirectly owns a 40-megawatt, gas-fired electric generation plant. The results of operations for CILCORP and Medina Valley were included in Ameren’s consolidated financial statements effective with the respective January and February 2003 acquisition dates.

The total acquisition cost was $1.4 billion and included the assumption by Ameren of CILCORP and Medina Valley debt of $895 million and consideration of $479 million in cash, net of $38 million cash acquired. The purchase price allocation for the acquisition of CILCORP and Medina Valley was finalized in January 2004, resulting in an $8 million decrease in goodwill primarily due to January 2004 adjustments to property and plant, income tax accounts, and accrued severance expenses. The following table presents the final estimated fair values of the assets acquired and

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liabilities assumed at the dates of our acquisitions of CILCORP and Medina Valley.


Current assets	$	323
Property and plant		1,162
Investments and other noncurrent assets		154
Specifically identifiable intangible assets		6
Goodwill		561
Total assets acquired		2,206
Current liabilities		190
Long-term debt, including current maturities		937
Other noncurrent liabilities		521
Total liabilities assumed		1,648
Preferred stock assumed		41
Net assets acquired	$	517

Specifically identifiable intangible assets of $6 million comprise retail customer contracts, which are subject to amortization with an average life of 10 years. Goodwill of $561 million (CILCORP - $554 million; Medina Valley - $7 million) was recognized in connection with the CILCORP and Medina Valley acquisitions. None of this goodwill is expected to be deductible for tax purposes.

NOTE 3 - RATE AND REGULATORY MATTERS

Below is a summary of significant regulatory proceedings. With respect to pending matters, we are unable to predict the ultimate outcome of these regulatory proceedings the timing of the final decisions of the various agencies or the impact on our results of operations, financial position, or liquidity.

IP and EEI Acquisition

Ameren received all the regulatory agency approvals necessary to acquire IP and a 20% interest in EEI from Dynegy on September 30, 2004.

The principal ongoing condition of the FERC’s approval of the acquisition was that 125 megawatts of EEI’s power be sold to a nonaffiliate of Ameren. The Missouri Office of Public Counsel and a group of electric industrial customers of UE, both interveners in the FERC proceeding, have asked the FERC to reconsider its order deferring to the MoPSC on the question of whether UE should be required to preserve its current entitlement to the output of EEI’s Joppa power plant facility. These appeals, which are pending, did not impede the completion of the acquisition on September 30, 2004. IP joined the MISO on September 30, 2004, satisfying an additional condition of the FERC’s approval of the acquisition.

The ICC order approving Ameren’s acquisition of IP contains several important provisions, including the following:

The order requires IP to submit quarterly reports in 2005 and 2006 on certain milestones regarding IP’s progress in achieving an estimated $33 million in annual synergies by the beginning of 2007, and provides for adjustments in IP’s next electric and gas rate cases if IP fails to achieve those milestones.

·	Commencing in 2007, IP will recover over four years, through rates, $67 million in reorganization costs related to the integration of IP into the Ameren system and the restructuring of IP. As of December 31, 2004, $59 million of reorganization costs were incurred and deferred as a regulatory asset.

The order approves a tariff rider to recover the costs of asbestos-related litigation claims, subject to the following terms: beginning in 2007, 90% of cash expenditures in excess of the amount included in base electric rates will be recovered by IP from a $20 million trust fund established by IP and financed with contributions of $10 million each by Ameren and Dynegy; if cash expenditures are less than the amount in base rates, IP will contribute 90% of the difference to the fund; once the trust fund is depleted, 90% of allowed cash expenditures in excess of base rates will be recovered through charges assessed to customers under the tariff rider.

Ameren commits to cause an aggregate of at least $750 million principal amount of IP’s long-term debt, including IP’s $550 million principal amount of mortgage bonds 11.50% Series due 2010, to be redeemed, repurchased or retired on or before December 31, 2006. As of December 31, 2004, $700 million principal amount of IP debt was retired in accordance with this provision.

The order provides IP with the ability to declare and pay $80 million of dividends on its common stock in 2005 and $160 million of dividends on its common stock cumulatively through 2006, provided IP has achieved an investment grade credit rating from S&P or Moody’s. If, however, IP’s $550 million principal amount of mortgage bonds 11.50% Series mortgage bonds due 2010 are not eliminated by December 31, 2006, IP may not thereafter declare or pay common dividends without seeking authority from the ICC. As of December 31, 2004, less than $1 million of the 11.50% Series mortgage bonds due 2010 were outstanding.

·	IP will establish a dividend policy comparable to the dividend policy of Ameren’s other Illinois utilities consistent with achieving and maintaining a common equity to total capitalization ratio between 50% to 60%.

·	Ameren will commit IP to make between $275 million and $325 million in energy infrastructure investments over its first two years of ownership.

Intercompany Transfer of Electric Generating Facilities and Illinois Service Territory

In July 2004, the FERC approved the transfer from Genco to UE, at net book value ($240 million) of 550 megawatts of CTs, but the transfer remains subject to SEC approval under the PUHCA. Approval by the ICC is not required, contingent upon prior approval and execution of UE’s transfer of its Illinois public utility operations to CIPS, as discussed below. Approval by the MoPSC is not required in order for this transfer of generating capacity to occur.

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However, the MoPSC has jurisdiction over UE’s ability to recover the cost of the transferred generating facilities from its electric customers in its rates.

In May 2003, UE announced its plan to limit its public utility operations to the state of Missouri and to discontinue operating as a public utility subject to ICC regulation. UE is seeking to accomplish this by transferring its Illinois-based electric and natural gas businesses, including its Illinois-based distribution assets and certain of its transmission assets, at net book value, to CIPS. In 2004, UE’s Illinois electric and gas service territory generated revenues of $165 million and had a net book property and plant value of $126 million at December 31, 2004. UE's electric generating facilities and a certain minor amount of its electric transmission facilities in Illinois would not be part of the transfer. UE proposes to transfer about half of the assets directly to CIPS in consideration for a CIPS subordinated promissory note, and approximately half of the assets by means of a dividend in kind to Ameren, followed by a capital contribution by Ameren to CIPS. The transfer was approved by the FERC in December 2003. In September 2004, the ICC authorized the transfer of UE’s Illinois-based natural gas utility business. The ICC had already authorized the transfer of UE’s Illinois-based electric utility business to CIPS in 2000. In February 2005, the MoPSC issued an order that approved the transfer subject to various conditions described below. The transfer of UE's Illinois-based utility businesses will also require the approval of the SEC under the provisions of the PUHCA. A filing seeking approval of both the transfer of UE’s Illinois-based utility businesses and Genco’s CTs was made with the SEC in October 2003. If completed, the transfers will be accounted for at book value with no gain or loss recognition, which is the appropriate treatment for transactions of this type between two entities under common control.

The MoPSC order approving UE’s transfer of its Illinois-based utility businesses to CIPS included the following principal conditions:

The order prevents UE from recovering in rates up to 6% of unknown UE generation-related liabilities associated with the generation that was formerly allocated to UE’s Illinois service territory unless UE can show the benefits of the transfer of the Illinois service territory outweigh these costs in future rate cases.

The order requires an amendment to the joint dispatch agreement among UE, Genco and CIPS, to declare that margins on short-term power sales will be divided based on generation output as opposed to load. This amendment is expected to provide UE with additional annual margins and Genco with reduced annual margins of $7 million to $24 million. However, this reduction to Genco’s margins is expected to be mitigated by margins received from additional power sales by Genco (through Marketing Company) to CIPS to serve the transferred UE Illinois-based electric power business through the end of 2006 under the current power supply contracts.

The order requires that, in a future rate case, revenues UE could have received for incremental energy transfers under the joint dispatch agreement resulting from the service territory transfer be imputed based on market prices unless UE can show the benefits of the transfer of the Illinois service territory outweigh the difference between the market prices and the actual cost-based charges for such incremental energy transfers.

Although not expressing dissatisfaction with the MoPSC order, UE, in February 2005, moved the MoPSC to clarify its order to provide that UE may complete the transfer prior to receipt of all regulatory approvals necessary to effectuate the required amendment to the joint dispatch agreement and also to provide that for rate-making purposes, the joint dispatch agreement amendment should be deemed to be made by UE as of the date the transfer is closed. This clarification of the MoPSC order is needed, according to UE’s motion, to facilitate timely electric service to Noranda Aluminum, Inc. as discussed below. Also in February 2005, the Missouri Office of Public Counsel filed an application for rehearing of the MoPSC order asserting that the order is unlawful, unjust, unreasonable and arbitrary in various ways.

See Note 14 - Related Party Transactions for a more detailed discussion of the joint dispatch agreement.

Missouri

Electric

In August 2002, a stipulation and agreement resolved an excess earnings complaint brought against UE by the MoPSC staff following the expiration of UE's experimental alternative regulation plan. The resolution became effective following agreement by all parties to the case and approval by the MoPSC. The stipulation and agreement includes the following principal features.

Missouri

Electric

·
The phase-in of $110 million of electric rate reductions through April 2004, $50 million of which was retroactively effective as of April 1, 2002, $30 million of which became effective on April 1, 2003, and $30 million of which became effective on April 1, 2004.

·
A rate moratorium providing for no changes in rates before July 1, 2006, subject to certain statutory and other exceptions.

·
A commitment to contribute $14 million to programs for low-income energy assistance and weatherization, promotion of energy efficiency and economic development in UE’s service territory in 2002, with additional payments of $3 million made annually on June

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30, 2003 through June 30, 2006. This entire obligation was expensed in 2002.

·
A commitment to make $2.25 billion to $2.75 billion in critical energy infrastructure investments from January 1, 2002 through June 30, 2006, including, among other things, the addition of more than 700 megawatts of new generation capacity and the replacement of steam generators at UE’s Callaway nuclear plant. The 700 megawatts of new generation is expected to be satisfied by UE’s addition of 240 megawatts in 2002 and the proposed transfer at net book value to UE of approximately 550 megawatts of generation assets from Genco, which is subject to receipt of necessary regulatory approvals. See Intercompany Transfer of Electric Generating Facilities and Illinois Service Territory within this Note for additional information on the proposed transfer.

·
An annual reduction in UE’s depreciation rates by $20 million, retroactive to April 1, 2002, based on an updated analysis of asset values, service lives, and accumulated depreciation levels.

·
A one-time credit of $40 million that was accrued during the plan period. The entire amount was paid to UE’s Missouri retail electric customers in 2002 for settlement of the final sharing period under the alternative regulation plan that expired June 30, 2001.

·
A cost of service study must be filed by January 1, 2006.

Gas

In January 2004, a stipulation and agreement resolved a request by UE to increase annual natural gas rates. The resolution became effective following agreement by all parties to the case and approval by the MoPSC. The stipulation and agreement authorized an increase in annual gas delivery rates of $13 million, effective February 15, 2004. Other principal features of the stipulation and agreement include:

·	A rate moratorium prohibiting changes in gas delivery rates before July 1, 2006, absent the occurrence of a significant, unusual event that has a major impact on UE.

A commitment to make $15 million to $25 million in infrastructure improvement investments from July 1, 2003, through December 31, 2006, including replacement of cast iron main and unprotected steel service lines. UE agreed not to propose rate adjustments to recover infrastructure costs through a statutory infrastructure system replacement surcharge prior to January 1, 2006.

·	Commitments to contribute an aggregate of $310,000 annually to programs for low-income weatherization, energy assistance, and energy-efficient equipment in UE’s service territory.

Authority to Serve Noranda

UE filed in December 2004 with the MoPSC for authority to extend its Missouri electric service territory to include the area where Noranda Aluminum, Inc. (Noranda) is located. Earlier in December, Noranda and UE signed a 15-year agreement to supply up to approximately 470 megawatts (peak load) electric service (or approximately 5% of UE’s generating capability, including purchases) to Noranda’s primary aluminum smelter in southeast Missouri. The supply agreement would become effective June 1, 2005, subject to the satisfaction of certain conditions. The conditions include the MoPSC granting UE authority to extend its service territory to include the Noranda facility; completion of the transfer to UE of 550 megawatts of CTs at Pinckneyville and Kinmundy, Illinois, by Genco, as discussed above in this Note under Intercompany Transfer of Electric Generating Facilities and Illinois Service Territory; completion of the transfer of UE’s Illinois service territory, also as discussed under that caption in this Note; and approval by the MoPSC of a proposed large customer transmission service rate. In February 2005, UE and other parties executed and filed a stipulation resolving all of the outstanding issues pending before the MoPSC. The stipulation is consistent in all material respects with UE’s application filed in December 2004. The MoPSC is expected to issue an order by the end of March 2005. The transmission arrangements to allow for UE to serve Noranda are subject to FERC approval. In February 2005, the MJMEUC filed a protest at the FERC as to UE’s filing made in January 2005 to amend the Interchange Agreeement. In its protest, the MJMEUC recommended that the FERC approve UE’s proposed amendment, but requested that the FERC condition its approval on UE being required to comply, after the fact, with the MISO Study Process. In early March 2005, UE filed its response contending that the FERC should not impose any conditions on the filing. A decision by the FERC is expected in late March 2005.

Illinois

Electric

In 2002, all of the Illinois residential, commercial and industrial customers of UE, CIPS, CILCO and IP had a choice in electric suppliers under the provisions of 1997 Illinois legislation related to the restructuring of the Illinois electric industry (the Illinois Customer Choice Law). Under the Illinois Customer Choice Law, UE, CIPS, CILCO and IP rates initially were frozen through January 1, 2005. Due to an amendment to the Illinois Customer Choice Law, the rate freeze was extended through January 1, 2007. As a result of this extension, and pursuant to orders of the ICC, CIPS and Marketing Company and CILCO and AERG extended their respective power supply agreements through December 31, 2006. See Note 14 - Related Party Transactions for a discussion of these affiliate power supply agreements.

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The Illinois Customer Choice Law contains a provision requiring that half of excess earnings from the Illinois jurisdiction for the years 1998 through 2006 be refunded to UE’s, CIPS’, CILCO’s and IP’s Illinois customers. Excess earnings are defined by the Illinois Customer Choice Law as the portion of the two-year average annual rate of return on common equity in excess of 1.5% of the two-year average of the Index. The Index is defined as the sum of the average for the 12 months ended September 30 of the average monthly yields of the Treasury long-term average plus 7% for both UE and CIPS, 11% for CILCO and 8.5% for IP. Estimated refunds totaling less than $1 million to UE’s Illinois customers are expected to be made during the period from April 1, 2004, through March 31, 2005, resulting from excess earnings during the year ended December 31, 2003. No refunds to CIPS’, CILCO’s or IP’s Illinois customers are expected to be made during that period.

On December 31, 2006, the current Illinois electric rate freeze expires, as do supply contracts for generation to serve the power requirements of CIPS, CILCO and IP expire. Prior to December 31, 2006, determinations must be made as to how all Illinois distribution companies will procure their generation needs and how they will set future rates for the generation components and delivery service components of customer rates.

During 2004, the ICC conducted workshops to seek input from interested parties on the framework for retail electric rate determination and generation procurement after the current Illinois electric rate freeze and supply contracts expire on December 31, 2006. A report issued by the ICC in late 2004 outlines a process that received strong support in the workshops: It would have CIPS, CILCO and IP procure power through an auction monitored by the ICC. The form of power supply would meet the full requirements of the utility and the risk of fluctuations in power requirements would be borne by the supplier. In addition, the report noted that many stakeholders, including Ameren, supported a process whereby the price of power resulting from the auction would be the price used to determine the generation component of customer rates. This purchased power would be charged to customers through a pass-through mechanism. With regard to the delivery service component of customer rates, it is expected that all Illinois delivery service companies will file rate cases, at which time the delivery service component of customer rates will be updated. Genco and AERG would probably participate in the auction, but there may be a limit imposed by the ICC on the maximum amount of power they could supply CIPS, CILCO and IP. In February 2005, CIPS, CILCO and IP filed with the ICC a proposed format for the generation procurement auction, a rate mechanism to pass generation costs through to customers, and a process to update the delivery service portion of rates, among other things. These proposals are subject to review and approval by the ICC within eleven months of the filings. In addition, the Illinois legislature began hearings regarding the framework for retail rate determination and generation procurement in February 2005. We cannot predict what actions, if any, the Illinois legislature will take, or whether the ICC will approve our proposals for generation procurement or electric rate determination.

Gas

In June 2004, IP filed with the ICC seeking authority to raise its natural gas delivery rates. In supplemental testimony, IP revised its requested rate increase to $25 million annually. The ICC staff in its rebuttal testimony recommended an increase in rates of $10.5 million. In January 2005, IP and the other parties in the proceeding submitted a partial settlement. If approved by the ICC, it will permit a rate increase of $11 million to $14 million. Issues relating to the proposed disallowance of costs associated with IP’s Hillsboro storage field were not resolved by the parties’ settlement; they were the subject of hearings held in January 2005. By law, the ICC is required to issue its decision about the partial settlement and the contested issues by May 2005. In the order approving Ameren’s acquisition of IP, the ICC prohibits IP from filing for any proposed increase in gas delivery rates to be effective prior to January 1, 2007, beyond IP’s pending request for a gas delivery rate increase. The ICC staff has proposed a disallowance of $7.6 millions part of IP’s 2003 PGA reconciliation proceeding related to the Hillsboro storage field.

In October 2003, the ICC issued orders awarding CILCO, CIPS and UE increases in annual natural gas delivery rates of $9 million, $7 million and $2 million, respectively. These new rates went into effect in November 2003.

Federal

Regional Transmission Organization

In December 1999, the FERC issued Order 2000, which required all utilities subject to the FERC jurisdiction to state their intentions for joining a RTO. The MoPSC issued an order in early 2004 authorizing UE to participate in the MISO for a five-year period, with participation after that period subject to further approvals by the MoPSC. Subsequently, the FERC issued a final order allowing UE’s and CIPS’ participation in the MISO. Under these orders, the MoPSC continues to set the transmission component of UE’s rates to serve its bundled retail load. CILCO was already a member of the MISO; it transferred functional control of its transmission system to the MISO prior to our acquisition of CILCO. Genco does not own transmission assets, but pays the MISO to use the transmission system to transmit power from the Genco generating plants.

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On May 1, 2004, functional control, but not ownership, of UE’s and CIPS’ transmission systems was transferred to the MISO through GridAmerica LLC. On September 30, 2004, prior to the completion of Ameren’s acquisition of IP as required by the FERC’s order approving the acquisition, IP transferred functional control, but not ownership, of its transmission system to the MISO. The transfers had no accounting impact on UE, CIPS and IP because they continue to own the transmission system assets. The participation by UE, CIPS and IP in the MISO is expected to increase annual costs by $10 million to $25 million in the aggregate. This could also result in a decrease in annual revenues of between $5 million and $15 million in the aggregate, depending upon the MISO’s tariff structure. UE, CIPS, CILCO and IP may also be required to expand their transmission systems according to decisions made by the MISO rather than according to their internal planning process.

As a part of the transfer of functional control of UE’s and CIPS’ transmission systems to the MISO, Ameren received $26 million, which represented the refund of the $13 million exit fee paid by UE and the $5 million exit fee paid by CIPS, both of which were expensed when they left the MISO in 2001, plus $1 million interest on the exit fees and the reimbursement of $7 million that was invested in the proposed Alliance RTO. These refunds resulted in after-tax gains of $11 million, $8 million, and $3 million for Ameren, UE, and CIPS, respectively, which were recorded in other operations and maintenance expenses during the quarter ended June 30, 2004. As part of the transfer of functional control of IP’s transmission system to the MISO at the end of September 2004, IP also received a refund of its MISO exit fee, plus interest on the exit fee, and RTO development costs resulting in after-tax gains of $9 million during the quarter ended September 30, 2004.

During late 2003 and early 2004, the FERC had ordered the elimination of regional through-and-out rates assessed by the MISO on transmission service between the MISO and PJM regions, to be effective May 1, 2004. However, in March 2004, the FERC accepted an agreement among affected transmission owners that retained the regional through-and-out rates until December 1, 2004. It also provided for continued negotiations aimed at developing a long-term transmission pricing structure based on specified principles to eliminate seams between the PJM and the MISO regions. In November 2004, the FERC announced that it had approved the new pricing structure to eliminate the seams between the MISO and PJM. The new rate structure applies for a fixed period ending January 31, 2008, and is based on the “license plate” rate design currently in place in both the MISO and PJM, under which payment of a single fee applicable to the transmission pricing zone in which the transmission customer’s load is located entitles that customer to transmission service over the entire combined system. However, to avoid an abrupt cost shift as a result of the elimination of pancaked rates between the MISO and PJM, the FERC also ordered the adoption of Seams Elimination Cost Adjustments (SECA). In late November 2004, UE, CIPS, CILCO and IP made SECA filings with the FERC. Numerous comments were filed in January 2005. In February 2005, the FERC accepted for filing the SECA filings submitted in the proceeding to become effective December 1, 2004, subject to refund and surcharge as appropriate, and it established hearing procedures. Until the SECA filings have finally been approved by the FERC, we cannot predict the ultimate impact that such rate structure will have on UE’s, CIPS’, CILCO’s and IP’s costs and revenues.

In March 2004, the MISO tendered for filing at the FERC a proposed Open Access Transmission and Energy Markets Tariff (the Energy Markets Tariff), which is intended to supersede its existing OATT. The Energy Markets Tariff establishes rates, terms and conditions necessary for implementation of a centralized economic dispatch platform, including locational marginal-cost pricing and FTRs for transmission service within the MISO region. The Energy Markets Tariff also establishes market monitoring and mitigation procedures and codifies existing resource adequacy requirements placed on the MISO members by their states or applicable RRO. The MISO initially proposed to make the Energy Markets Tariff effective on December 1, 2004, subject to its ability to implement the Energy Markets Tariff. However, implementation of the Energy Markets Tariff is now expected to be effective on April 1, 2005. On August 6, 2004, the FERC accepted the MISO’s Energy Markets Tariff, subject to further compliance filings. On November 8, 2004, the FERC issued an order denying the requests for rehearing that were filed by a number of the MISO stakeholders including Ameren. However, a final order from the FERC on the compliance filings made by the MISO in response to the FERC’s August 6 order is still pending. At this time, Ameren is unable to determine the full impact that the Energy Markets Tariff will have until further information is available regarding the implementation of the Energy Markets Tariff.

Until UE, CIPS, CILCO and IP achieve some degree of operational experience participating in the MISO, we are unable to predict the ultimate impact that such participation or ongoing RTO developments at the FERC or other regulatory authorities will have on our results of operations, financial position, or liquidity.

Hydroelectric License Renewal

In November 2004, the FERC formally accepted UE’s February 2004 license renewal application, and it solicited terms and conditions from the U.S. Department of Interior and various state agencies to renew the license for its Osage hydroelectric plant for an additional 50-year term. The current FERC license expires on February 28, 2006. The license application proposes to continue operations at the Osage

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plant as a peaking facility, to upgrade four turbine units, and to maximize the hydroelectric capacity of the plant.

New Market Power Analysis Screen Order

In an order issued in April 2004, the FERC replaced the Supply Margin Assessment Screen previously used to review the applications by sellers of electricity at wholesale for authorization to sell power at market-based rates. The new system uses two alternative measures of market power: (1) a pivotal supplier analysis and (2) a market share analysis, which is to be prepared on a seasonal basis. Applicants located in a RTO with sufficient market structure and a single energy market were permitted to base these measures of market power on the size of the market in the geographic region under the control of the RTO. Other applicants were required to base these measures of market power on the size of the market in the control area in which they operate. If the applicant passes both screens, a rebuttable presumption will exist that it lacks generation market power. If the applicant fails either screen, a rebuttable presumption will exist that it has market power. Under such circumstances, the applicant may either seek to rebut the presumption by preparing a delivered price test (identifying the amount of economic capacity from neighboring areas that can be delivered to the control area) or propose mitigation measures. Unless some other mitigation measure is adopted, the applicant’s authority to sell power at market-based rates in areas where it has market power will be revoked, and the applicant will be required to sell at cost-based rates in those areas.

UE, Genco, CIPS, CILCO, AERG, Development Company, Marketing Company, and Medina Valley currently have authorization from the FERC to sell power at market-based rates. As required, these Ameren companies filed an updated market power analysis with the FERC in December 2004. All of the Ameren companies pass both screen measures for the market consisting of the entire MISO footprint. In their December filing, they wrote that because MISO’s Day Two Markets, at such date, were scheduled to begin March 1, 2005, the MISO footprint was the only relevant market for measuring whether any of the Ameren companies possess market power as defined by the FERC. Also in their December filing, they offered to submit supplemental information that applies the new tests to smaller markets consisting of the control areas in which the Ameren companies sell power, if the MISO Day Two Markets did not begin on March 1, 2005, as originally scheduled. In January 2005, the effective date of the MISO Day Two was moved to April 1, 2005; however, with only a one-month delay, we still believe that applying the new screens on the basis of the entire MISO footprint is inappropriate. In January 2005, the Missouri Joint Municipal Electric Utility Commission (MJMEUC) filed a protest to our December filing. The MJMEUC is an association of Missouri municipal customers, that purchase transmission service from Ameren. In its protest, the MJMEUC contends that the Ameren companies have not shown they lack market power, that the MISO footprint is not the relevant market, and that the MISO's energy markets will not be sufficient to protect consumers from market power abuses, especially with respect to long-term markets. In February 2005, the Ameren companies filed a response to the MJMEUC’s protest, responding to each of these claims. We are unable to anticipate how or when the FERC will respond to our December filing and to any supplemental filing. Therefore, we are unable to predict the ultimate impact the new screens will have on our ability to sell power at market-based rates.

Regulatory Assets and Liabilities

In accordance with SFAS No. 71, UE, CIPS, CILCO and IP defer certain costs pursuant to actions of regulators and are currently recovering such costs in rates charged to customers.

The following table presents our regulatory assets and regulatory liabilities at December 31, 2004 and 2003:


	Ameren^(a)		UE		CIPS		CILCORP^(b)		CILCO		IP^(c)
2004:
Regulatory assets:
Income taxes^(d)(e)	$	335	$	332	$	2	$	1	$	1	$	-
Asset retirement obligation^(e)(f)		124		124		-		-		-		-
Callaway costs^(g)		73		73		-		-		-		-
Unamortized loss on reacquired debt^(e)(h)		89		37		6		5		5		41
Recoverable costs - contaminated facilities^(e)(i)		87		1		25		4		4		57
IP integration^(j)		59		-		-		-		-		59
Recoverable costs - debt fair value adjustment^(k)		40		-		-		-		-		40
Other^(e)(l)		22		18		-		1		1		1
Total regulatory assets	$	829	$	585	$	33	$	11	$	11	$	198
Regulatory liabilities:
Income taxes^(m)	$	219	$	189	$	13	$	17	$	17	$	(1)
Removal costs⁽ⁿ⁾		823		587		138		21		159		77
Total regulatory liabilities	$	1,042	$	776	$	151	$	38	$	176	$	76

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	Ameren^(a)		UE		CIPS		CILCORP^(b)		CILCO		IP^(c)
2003:
Regulatory assets:
Income taxes^(d)(e)	$	431	$	425	$	-	$	6	$	6	$	-
Asset retirement obligation^(e)(f)		122		122		-		-		-		-
Callaway costs^(g)		77		77		-		-		-		-
Unamortized loss on reacquired debt^(e)(h)		46		36		5		5		5		47
Recoverable costs - contaminated facilities^(e)(i)		27		-		23		4		4		39
Transition period cost-recovery^(o)		-		-		-		-		-		117
Clinton decommissioning cost-recovery^(p)		-		-		-		-		-		5
Other^(e)(l)		26		25		-		1		1		-
Total regulatory assets	$	729	$	685	$	28	$	16	$	16	$	208
Regulatory liabilities:
Income taxes^(m)	$	127	$	96	$	14	$	17	$	17	$	57
Removal costs⁽ⁿ⁾		697		556		131		7		150		72
Total regulatory liabilities	$	824	$	652	$	145	$	24	$	167	$	129

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; includes amounts for Ameren Registrant and non-Registrant subsidiaries and intercompany eliminations.

(b)	CILCORP consolidates CILCO and therefore includes CILCO amounts in its balances.

(c)	2003 amounts represent predecessor information.

(d)	Amount represents SFAS No. 109 deferred tax asset. See Note 13 - Income Taxes for amortization period.

(e)	These assets do not earn a return.

(f)	Represents recoverable costs for asset retirement obligations at our rate-regulated operations. See SFAS No. 143 discussion in Note 1 - Summary of Significant Accounting Policies.

(g)

Represents UE’s Callaway nuclear plant operations and maintenance expenses, property taxes, and carrying costs incurred between the plant in-service date and the date the plant was reflected in rates. These costs are being amortized over the remaining life of the plant’s current operating license through 2024.

(h)	Represents losses related to repaid debt. These amounts are being amortized over the lives of the related new debt issues or the remaining lives of the old debt issues if no new debt was issued.

(i)	Represents the recoverable portion of accrued environmental site liabilities primarily collected from electric and gas customers through ICC approved revenue riders in Illinois.

(j)	Represents reorganization costs related to the integration of IP into the Ameren system and the restructuring of IP. Per the ICC order approving Ameren’s acquisition of IP, these costs are recoverable over four years after 2006 through rates.

(k)	Represents a portion of IP’s unamortized debt fair value adjustment recorded upon Ameren’s acquisition of IP at September 30, 2004. This portion will be amortized over the remaining life of the related debt upon expiration of the electric rate freeze in Illinois in 2006.

(l)

Represents Y2K expenses being amortized over six years starting in 2002, in conjunction with the 2002 settlement of UE’s Missouri electric rate case and a DOE decommissioning assessment being amortized over 14 years through 2007. In addition, this amount includes the portion of merger-related expenses applicable to the Missouri retail jurisdiction, which are being amortized through 2007 based on a MoPSC order.

(m)	Represents unamortized portion of investment tax credit and federal excess taxes. See Note 13 - Income Taxes for amortization period.

(n)	Represents estimated funds collected for the eventual dismantling and removing plant from service, net of salvage value, upon retirement related to our rate-regulated operations. See SFAS No. 143 discussion in Note 1 - Summary of Significant Accounting Policies.

(o)	Represents potentially noncompetitive investment costs (stranded costs) that IP was allowed to recover from retail customers during the transition period (until December 31, 2006) through frozen bundled rates and transition charges from customers who select other electric suppliers.

(p)

Represents ICC-allowed decommissioning costs associated with IP’s former nuclear plant. The regulatory asset for the probable future collections from rate payers of decommissioning costs was amortized as the decommissioning costs are collected. See Note 15 - Commitments and Contingencies for further discussion.

UE, CIPS, CILCO and IP continually assess the recoverability of their regulatory assets. Under current accounting standards, regulatory assets are written off to earnings when it is no longer probable that such amounts will be recovered through future revenues. Electric industry restructuring legislation may affect the recoverability of electric regulatory assets in the future.

IP’s predecessor financial statements included a cost-recovery asset related to the recovery of certain stranded costs during the Illinois Customer Choice Law transition period, which extends until December 31, 2006. IP had recorded a regulatory asset of $341 million in 1998 for the portion of its stranded costs it expected to recover during the transition period. The transition-period cost-recovery asset amortization reflected in IP’s predecessor statement of income was $29 million during the nine months ended September 30, 2004, $39 million in 2003, and $71 million in 2002. No value was assigned to the transition-period cost-recovery asset in the allocation of the purchase price for IP upon the acquisition by Ameren on September 30, 2004. See Note 2 - Acquisitions for more information regarding the purchase price allocation.

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NOTE 4 - PROPERTY AND PLANT, NET

The following table presents property and plant, net for each of the Ameren Companies at December 31, 2004 and 2003:


	Ameren^(a)		UE		CIPS		Genco		CILCORP		CILCO		IP^(b)
2004:
Property and plant, at original cost:
Electric	$	18,050	$	11,082	$	1,314	$	2,538	$	1,008	$	1,560	$	1,490
Gas		1,248		312		302		-		176		455		458
Other		262		39		5		-		48		2		1
		19,560		11,433		1,621		2,538		1,232		2,017		1,949
Less: Accumulated depreciation and amortization		6,994		4,885		673		831		105		904		30
		12,566		6,548		948		1,707		1,127		1,113		1,919
Construction work in progress:
Nuclear fuel in process		90		90		-		-		-		-		-
Other		641		437		5		42		52		52		65
Property and plant, net	$	13,297	$	7,075	$	953	$	1,749	$	1,179	$	1,165	$	1,984
2003:
Property and plant, at original cost:
Electric	$	16,050	$	10,715	$	1,289	$	2,530	$	981	$	1,475	$	2,279
Gas		743		282		295		-		166		445		770
Other		211		37		5		-		2		2		-
		17,004		11,034		1,589		2,530		1,149		1,922		3,049
Less: Accumulated depreciation and amortization		6,591		4,688		642		777		58		857		1,199
		10,413		6,346		947		1,753		1,091		1,065		1,850
Construction work in progress:
Nuclear fuel in process		66		66		-		-		-		-		-
Other		441		346		8		21		36		36		99
Property and plant, net	$	10,920	$	6,758	$	955	$	1,774	$	1,127	$	1,101	$	1,949

(a) 2003 amounts exclude amounts for IP; includes amounts for non-Registrant Ameren subsidiaries as well as intercompany eliminations.

(b) 2003 amounts represent predecessor information.

NOTE 5 - SHORT-TERM BORROWINGS AND LIQUIDITY

Short-term borrowings typically consist of commercial paper issuances and drawings under committed bank credit facilities with maturities generally within 1 to 45 days.

The following table summarizes the short-term borrowing activity and relevant interest rates for the years ended December 31, 2004 and 2003, respectively:


	Ameren^(a)	UE	IP^(b)
2004:
Short-term borrowings at December 31, 2004	$ 417	$ 375	$ -
Average daily borrowings outstanding during the year	47	33	-
Weighted average interest rate during 2004	2.19%	1.56%	0.0%
Peak short-term borrowings during 2004	419	375	-
Peak interest rate during 2004	2.97%	2.40%	0.0%
2003:
Short-term borrowings at December 31, 2003	$ 161	$ 150	$ -
Average daily borrowings outstanding during the year	24	24	33
Weighted average interest rate during 2003	1.10%	1.10%	2.60%
Peak short-term borrowings during 2003	228	228	100
Peak interest rate during 2003	2.08%	1.20%	2.60%

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; excludes amounts for CILCORP prior to the acquisition date of January 31, 2003; and includes amounts for Ameren Registrant and non-Registrant subsidiaries and intercompany eliminations.

(b)	2003 represents predecessor information.

At December 31, 2004, certain of the Ameren Companies had committed bank credit facilities totaling $1,164 million, $789 million of which was available for use, subject to applicable regulatory short-term borrowing authorizations, by UE, CIPS, CILCO, IP, and Ameren Services through a utility money pool arrangement. At December 31, 2004, UE had $375 million of commercial paper borrowings outstanding, which reduced the available amounts under these facilities. All of the $789 million was available for use, subject to applicable regulatory short-term borrowing authorizations, by Ameren directly, by CILCORP through direct short-term borrowings from Ameren, and by most of the non-rate-regulated subsidiaries including, but not limited to, Resources Company, Genco, Marketing Company, AFS,

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AERG, and Ameren Energy, through a non-state-regulated subsidiary money pool agreement. Ameren has money pool agreements with and among its subsidiaries to coordinate and provide for certain short-term cash and working capital requirements. Separate money pools are maintained between rate-regulated and non-rate-regulated entities. In addition, a unilateral borrowing agreement exists between Ameren, IP and Ameren Services, which enables IP to make short-term borrowings directly from Ameren. The aggregate amount of borrowings outstanding at any time by IP under the unilateral borrowing agreement and the utility money agreement, together with any outstanding external short-term borrowings by IP, may not exceed $500 million pursuant to authorizations from the ICC and the SEC under the PUHCA. Ameren Services is responsible for operation and administration of the agreements. See Note 14 - Related Party Transactions for a detailed explanation of the money pool arrangements and the unilateral borrowing agreement. The committed bank credit facilities are used to support our commercial paper programs under which $375 million was outstanding for Ameren on a consolidated basis at December 31, 2004 (2003 - $150 million). Access to our credit facilities for all Ameren Companies is subject to reduction based on use by affiliates.

In April 2004, UE renewed, for an additional one-year term, its $75 million 364-day committed credit facility, which is to be used for general corporate purposes, including support of its commercial paper program. This facility makes borrowings available at various interest rates based on London Interbank Offered Rate (LIBOR), agreed rates, and other options. CIPS, CILCO and IP can access this facility through the utility money pool agreement.

In July 2004, Ameren entered into two new revolving credit facilities totaling $700 million to be used for general corporate purposes, including support of Ameren and UE commercial paper programs. The $700 million in new facilities includes a $350 million three-year revolving credit facility and a $350 million five-year revolving credit facility. These new credit facilities replaced Ameren’s existing $235 million 364-day revolving credit facility, which matured in July 2004, and a $130 million multiyear revolving credit facility, which would have matured in July 2005. In September 2004, an existing Ameren $235 million multiyear revolving facility, which matures in July 2006, was amended and restated to accommodate Ameren’s acquisition of IP and to conform with the two credit facilities entered into in July 2004.

EEI has two bank credit agreements totaling $45 million with maturities through June 2005. At December 31, 2004, $7 million was available under these committed credit facilities.

Borrowings under Ameren’s non-state-regulated subsidiary money pool agreement by Genco, Development Company, and Medina Valley, each an “exempt wholesale generator,” are considered investments for purposes of the 50% SEC aggregate investment limitation. Based on Ameren’s aggregate investment in these “exempt wholesale generators” as of December 31, 2004, the maximum permissible borrowings under Ameren’s non-state-regulated subsidiary money pool pursuant to this limitation for these entities totaled $507 million.

Indebtedness Provisions and Other Covenants

Certain of the Ameren Companies’ bank credit agreements contain provisions which, among other things, place restrictions on the ability to incur liens, sell assets, and merge with other entities. Certain of these credit agreements also contain a provision that limits Ameren’s, UE’s, CIPS’ and CILCO’s total indebtedness to 60% of total capitalization pursuant to a calculation defined in the agreement. Exceeding these debt levels would result in a default under the credit arrangements. As of December 31, 2004, the ratio of total indebtedness to total capitalization (calculated in accordance with this provision) for Ameren, UE, CIPS and CILCO was 50%, 44%, 53% and 43%, respectively (2003 - 52%, 44%, 54%, 53%). From and after March 31, 2005, IP’s total indebtedness will also be limited by this provision. In addition, certain of these credit agreements contain indebtedness cross-default provisions and material adverse change clauses that could trigger a default under these facilities in the event that any of Ameren’s subsidiaries (subject to the definition in the underlying credit agreements), other than certain project finance subsidiaries, defaults in indebtedness in excess of $50 million. The credit agreements also require us to meet minimum ERISA funding rules.

None of the Ameren Companies’ credit agreements or financing arrangements contain credit rating triggers. One of EEI’s credit agreements contains a credit rating trigger under which a default can occur in the event any of the sponsor’s (as defined in the credit agreements) credit rating falls below Baa3 or BBB- by Moody’s and S&P and the sponsor does not cover a payment default. A $100 million CILCO bank term loan containing a credit rating trigger was repaid in February 2004. At December 31, 2004, the Ameren Companies and EEI were in compliance with their credit agreement provisions and covenants.

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NOTE 6 - LONG-TERM DEBT AND EQUITY FINANCINGS

The following table presents long-term debt outstanding for the Ameren Companies and EEI as of December 31, 2004 and 2003:


	2004			2003
Ameren Corporation (parent):
2002 5.70% notes due 2007	$	100		$	100
Senior notes due 2007		345			345
Total long-term debt, gross		445			445
Less: Maturities due within one year		-			-
Long-term debt, net	$	445		$	445
UE:
First mortgage bonds:^(a)
6.875% Series due 2004	$	-		$	188
7.375% Series due 2004		-			85
6.75% Series due 2008		148			148
5.25% Senior secured notes due 2012		173			173
4.65% Senior secured notes due 2013		200			200
4.75% Senior secured notes due 2015		114			114
5.10% Senior secured notes due 2018		200			200
7.00% Series due 2024		-			100
5.45% Series due 2028^(b)		44			44
5.50% Senior secured notes due 2034		184			184
5.10% Senior secured notes due 2019		300			-
5.50% Senior secured notes due 2014		104			-
Environmental improvement and pollution control revenue bonds:^(b)(c)
1991 Series due 2020		43			43
1992 Series due 2022		47			47
1998 Series A due 2033		60			60
1998 Series B due 2033		50			50
1998 Series C due 2033		50			50
2000 Series A due 2035		64			64
2000 Series B due 2035		63			63
2000 Series C due 2035		60			60
Subordinated deferrable interest debentures
7.69% Series A due 2036^(d)		66			66
Capital lease obligations:
Nuclear fuel lease		-			67
City of Bowling Green lease (Peno Creek CT)		96			100
Total long-term debt, gross		2,066			2,106
Less: Unamortized discount and premium		(4	)		(4	)
Less: Maturities due within one year		(3	)		(344	)
Long-term debt, net	$	2,059		$	1,758
CIPS:
First mortgage bonds:^(a)
6.49% Series 1995-1 due 2005	$	20		$	20
7.05% Series 1997-2 due 2006		20			20
5.375% Series due 2008		15			15
6.625% Series due 2011		150			150
7.61% Series 1997-2 due 2017		40			40
6.125% Series due 2028		60			60
Environmental improvement Series 2004 due 2025^(a)(b)(c)		35			-
Pollution control revenues bonds 2000 Series A 5.50% due 2014^(e)		51			51
1993 Series C-1 5.95% due 2026^(e)		35			35
1993 Series C-2 5.70% due 2026		8			25
1993 Series A 6.375 % due 2028		-			35
1993 Series B-1 5.0% due 2028^(e)		17			17
1993 Series B-2 5.90% due 2028		-			18
Total long-term debt, gross		451			486
Less: Unamortized discount and premium		(1	)		(1	)
Less: Maturities due within one year		(20	)		-
Long-term debt, net	$	430		$	485

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		2004			2003
Genco:
Unsecured notes:
2000 Senior notes Series C 7.75 % due 2005	$	225		$	225
2000 Senior notes Series D 8.35% due 2010		200			200
2002 Senior notes Series F 7.95% due 2032		275			275
Total long-term debt, gross		700			700
Less: Unamortized discount and premium		(2	)		(2	)
Less: Maturities due within one year		(225	)		-
Long-term debt, net	$	473		$	698
CILCORP (parent):^(f)
8.70% Senior notes due 2009	$	198		$	198
9.375% Senior notes due 2029		220			237
Fair market value adjustments		83			96
Long-term debt, net		501			531
CILCO:
First mortgage bonds^(a):
7.50% Series due 2007	$	50		$	50
Medium-term notes:^(a)
6.13% Series due 2005		16			16
7.73% Series due 2025		20			20
Pollution control refunding bonds^(a)(b)
Series 2004 due 2039^(c)		19			-
6.50% Series 1992C due 2010		-			5
6.20% Series 1992B due 2012		1			1
6.50% Series 1992A due 2018		-			14
5.90% Series 1993 due 2023		32			32
Bank term loans:
Secured bank term loan due 2004		-			100
Total long-term debt, gross		138			238
Less: Unamortized discount and premium		-			-
Less: Maturities due within one year		(16	)		(100	)
Long-term debt, net	$	122		$	138
CILCORP consolidated long-term debt, net	$	623		$	669
IP:
Mortgage Bonds^(a):
6.75% series due 2005	$	70		$	70
7.50% series due 2009		250			250
7.50% series due 2025		-			66
11.50% series due 2010		-			550
Pollution control revenue bonds^(a)(b)
5.70% 1994A Series due 2024		36			36
7.40% 1994B Series due 2024		-			84
5.40% 1998A Series due 2028		19			19
5.40% 1998B Series due 2028		33			33
Adjustable rate series due 2032 (1997 Series A, B and C)^(c)		150			150
Adjustable rate series due 2028 (Series 2001)^(c)		112			112
Adjustable rate series due 2017 (Series 2001)^(c)		75			75
Tilton capital lease obligation		-			71
Fair market value adjustments		43			9
Total long-term debt, gross		788			1,525
Less: Unamortized discount and premium		(5	)		(19	)
Less: Maturities due within one year		(70	)		(71	)
Long-term debt, net	$	713		$	1,435
Long-term debt payable to IP SPT
5.38% due 2005 A-5	$	20		$	106
5.54 due 2007 A-6		175			175
5.65 due 2008 A-7		139			139
Fair market value adjustments		18			(1	)
Total long-term debt payable to IP SPT		352			419
Less: Maturities due within one year^(g)		(74	)		(74	)
Long-term debt payable to IP SPT, net	$	278		$	345

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		2004		2003
EEI:
2000 Bank term loan, 7.61% due 2004	$	-	$	40
1991 Senior medium term notes 8.60% due through 2005		7		13
1994 Senior medium term notes 6.61% due through 2005		8		16
Total long-term debt, gross		15		69
Less: Maturities due within one year		15		54
Long-term debt, net	$	-	$	15
Less: IP Long-term debt prior to acquisition date		-		(1,780	)
Ameren consolidated long-term debt, net	$	5,021	$	4,070

(a) At December 31, 2004, a majority of property and plant was mortgaged under, and subject to liens of, the respective indentures pursuant to which the bonds were issued.

Substantially all of long-term debt issued by UE, CIPS, CILCO and IP is secured by a lien on substantially all of its property and franchises.

(b) Environmental Improvement or Pollution Control Series secured by first mortgage bonds. In addition, UE’s 1991, 1992, 1998 and 2000 series; CIPS’ 2004 series and CILCO’s

2004 series bonds are backed by an insurance guarantee policy.

(c) Interest rates, and the periods during which such rates apply, vary depending on our selection of certain defined rate modes. The average interest rates for the years 2004

and 2003 were as follows:

	2004	2003		2004	2003
UE 1991 Series	1.39%	1.60%	CIPS Series 2004	1.56%	-
UE 1992 Series	1.43%	1.64%	CILCO Series 2004	1.55%	-
UE 1998 Series A	1.30%	1.75%	IP 1997 Series A	1.68%	1.85%
UE 1998 Series B	1.28%	1.75%	IP 1997 Series B	1.55%	1.75%
UE 1998 Series C	1.26%	1.77%	IP 1997 Series C	1.535%	1.55%
UE 2000 Series A	1.19%	1.80%	IP Series 2001 (amortizing)	1.56%	1.85%
UE 2000 Series B	1.24%	1.77%	IP Series 2001	1.58%	1.75%
UE 2000 Series C	1.23%	1.75%

(d) Under the terms of the subordinated debentures, UE may, under certain circumstances, defer the payment of interest for up to five years. Upon the election to defer

interest payments, UE dividend payments to Ameren are prohibited.

(e) Variable-rate tax-exempt pollution control indebtedness that was converted to long-term fixed rates.

(f) CILCORP’s long-term debt is secured by a pledge of all of the common stock of CILCO.

(g) IP’s long-term debt payable to IP SPT was reduced by $12 million of overfunding at both December 31, 2004 and 2003.

The following table presents the aggregate maturities of long-term debt for the Ameren Companies at December 31, 2004:


	Ameren (parent)		UE		CIPS		Genco		CILCORP (parent)^(a)		CILCO		IP^(b)		Ameren Consolidated
2005^(c)	$	-	$	3	$	20	$	225	$	-	$	16	$	144	$	423
2006		-		4		20		-		-		-		86		110
2007		445		4		-		-		-		50		86		585
2008		-		152		15		-		-		-		87		254
2009		-		4		-		-		198		-		250		452
Thereafter		-		1,899		396		475		220		72		426		3,488
Total	$	445	$	2,066	$	451	$	700	$	418	$	138	$	1,079	$	5,312

(a)	Excludes $83 million related to CILCORP’s long-term debt fair market value adjustments.

(b)	Excludes $61 million related to IP’s long-term debt fair market value adjustments.

(c)	Total maturities of $423 million include $15 million of EEI current maturities of long-term debt.

All of the Ameren Companies expect to fund maturities of long-term debt and contractual obligations through a combination of cash flow from operations and external financing. See Note 5 - Short-term Borrowings and Liquidity for a discussion of external financing availability.

The following table presents the authorized amounts under Form S-3 shelf registration statements filed and declared effective for certain of the Ameren Companies as of January 31, 2005:


	Authorized Date	Authorized Amount	Issued	Available
Ameren^(a)	June 2004	$ 2,000	$ 459	$ 1,541
UE^(b)	September 2003	1,000	689	311
CIPS	May 2001	250	150	100

(a)	Ameren issued securities totaling $875 million under the August 2002 shelf registration statement and $459 million under the September 2003 shelf registration statement.

(b)	UE issued securities totaling $200 million in 2003, $404 million in 2004 and $85 million in January 2005.

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Ameren

In February 2004, Ameren issued, pursuant to an August 2002 SEC Form S-3 shelf registration statement, 19.1 million shares of its common stock at $45.90 per share, for net proceeds of $853 million. This issuance substantially depleted all of the capacity under the August 2002 shelf registration statement. In June 2004, the SEC declared effective a Form S-3 shelf registration statement filed by Ameren and its subsidiary trusts covering the offering from time to time of up to $2 billion of various types of securities, including long-term debt, trust preferred securities, and equity securities. In July 2004, Ameren issued, pursuant to the June 2004 Form S-3 shelf registration statement, 10.9 million shares of its common stock at $42.00 per share, for net proceeds of $445 million. The proceeds from both of these offerings were used to pay the cash portion of the purchase price for our acquisition of IP and Dynegy's 20% interest in EEI and, as described below under IP, to reduce IP debt assumed as part of the acquisition and to pay related premiums.

The purchase of IP on September 30, 2004, included the assumption of IP debt and preferred stock at closing of $1.8 billion. The assumed debt and preferred stock included $936 million of mortgage bonds, $509 million of pollution control indebtedness supported by mortgage bonds, $352 million of TFNs issued by IP SPT, and $13 million of preferred stock not acquired and owned by Ameren. Upon acquisition, total IP debt was increased to fair value by $191 million. The adjustment to the fair value of each debt series is being amortized over its remaining life, or to the expected redemption date, to interest expense.

In March 2004, the SEC declared effective a Form S-3 registration statement filed by Ameren in February 2004, authorizing the offering of 6 million additional shares of its common stock under DRPlus. Shares of common stock sold under DRPlus are, at Ameren’s option, newly issued shares or treasury shares, or shares purchased in the open market or in privately negotiated transactions. Ameren is currently selling newly issued shares of its common stock under DRPlus. In December 2001, Ameren began issuing new shares of common stock in connection with certain of our 401(k) plans pursuant to effective Form S-8 registration statement. Under DRPlus and our 401(k) plans, Ameren issued a total of 2.3 million shares of common stock in 2004 valued at $107 million. Under the DRPlus and our 401(k) plans, Ameren issued 2.5 million and 2.3 million shares of common stock in 2003 and 2002, respectively, which were valued at $105 million and $93 million for the respective years.

In March 2002, Ameren issued $345 million of adjustable conversion-rate equity security units and $227 million (gross proceeds) of common stock (5 million shares at $39.50 per share and 750,000 shares, pursuant to the exercise of an option granted to the underwriters, at $38.865 per share). The $25 adjustable conversion-rate equity security units each consisted of an Ameren senior unsecured note with a principal amount of $25 and a contract to purchase, for $25, a fraction of a share of Ameren common stock on May 15, 2005. The senior unsecured notes were recorded at their fair value of $345 million and will mature on May 15, 2007. Total distributions on the equity security units were originally made at an annual rate of 9.75%, consisting of quarterly interest payments on the senior unsecured notes at the initial annual rate of 5.20% and contract adjustment payments under the stock purchase contracts at the annual rate of 4.55%. In February 2005, the annual interest rate on $375 million principal amount of Ameren’s senior unsecured notes due May 15, 2007, was reset from 5.20% to 4.263%. The stock purchase contracts require holders to purchase 8.7 million to 7.4 million shares of Ameren common stock on May 15, 2005, at the market price at that time, subject to a minimum share purchase price of $39.50 and a maximum of $46.61. The stock purchase contracts included a pledge of the related senior unsecured notes as collateral for the stock purchase obligation. As a result of the February 2005 remarketing of the senior unsecured notes, treasury securities were substituted for the senior unsecured notes and are currently pledged as collateral for the stock purchase obligation and the senior unsecured notes were released from the pledge. In 2002, we recorded the net present value of the stock purchase contract adjustment payments of $46 million as an increase in Other Deferred Credits and Liabilities to reflect our obligation and a decrease in Other Paid-in Capital to reflect the fair value of the stock purchase contract. The liability for the stock purchase contract adjustment payments (December 31, 2004 - $6 million; December 31, 2003 - $21 million) will be reduced as such payments are made through May 15, 2005.

As discussed above, in February 2005, the annual interest rate on the $345 million principal amount of Ameren’s senior unsecured notes due May 15, 2007 was reset from 5.20% to 4.263%. These senior unsecured notes were originally issued in March 2002 as a component of Ameren’s publicly traded adjustable conversion-rate equity security units. As required by the original terms of the agreement, the interest rate was reset because Ameren remarketed these senior unsecured notes. The proceeds from the remarketing of the senior unsecured notes were used by the former holders of the adjustable conversion-rate equity security units to purchase treasury securities to secure their obligations to purchase Ameren common stock pursuant to the stock purchase contracts in May 2005. As part of this remarketing, Ameren also repurchased $95 million in principal amount of the senior unsecured notes; it has subsequently retired these notes.

In 2004, UE received a capital contribution from Ameren totaling $16 million, as a result of an allocation of income tax benefit in 2004 and 2003, pursuant to the tax-allocation agreement among the Ameren Companies.

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UE had a lease agreement, scheduled to expire on August 31, 2031, that provided for the financing of a portion of its nuclear fuel that was processed for use or was consumed at UE’s Callaway nuclear plant. In February 2004, UE terminated this lease with a final payment of $67 million made in January 2004.

In February and March 2004, in connection with the delivery of bond insurance policies to secure the environmental improvement and pollution control revenue bonds (Series 1991, 1992, 1998A, 1998B, 1998C, 2000A, 2000B and 2000C) previously issued by the Missouri Environmental Authority, UE delivered separate series of its first mortgage bonds (which are subject to fallaway provisions, as defined in the related financing agreements, similar to those included in its first mortgage bonds that secure UE’s senior secured notes) to secure its respective obligations under the existing loan agreements with the Missouri Environmental Authority relating to such environmental improvement and pollution control revenue bonds. As a result, the environmental improvement and pollution control revenue bonds were rated Aaa, AAA, and AAA by Moody’s, S&P, and Fitch, respectively.

In May 2004, UE issued, pursuant to its September 2003 SEC Form S-3 shelf registration statement, $104 million of 5.50% senior secured notes due May 15, 2014, with interest payable semi-annually on May 15 and November 15 of each year beginning in November 2004. UE received net proceeds of $103 million, which were used to redeem its $100 million 7.00% first mortgage bonds due 2024.

In September 2004, UE issued, pursuant to its September 2003 SEC Form S-3 shelf registration statement, $300 million of 5.10% senior secured notes due October 1, 2019, with interest payable semi-annually on April 1 and October 1 of each year beginning in April 2005. UE received net proceeds of $298 million, which were used to repay short-term debt temporarily incurred to fund the maturity of UE’s $188 million 6.875% first mortgage bonds on August 1, 2004, and to repay other short-term debt, which consisted of borrowings under the utility money pool arrangement.

In January 2005, UE issued, pursuant to its September 2003 SEC Form S-3 shelf registration statement, $85 million of 5.00% senior secured notes due February 1, 2020, with interest payable semi-annually on February 1 and August 1 of each year beginning in August 2005. UE received net proceeds of $83 million, which were used to repay short-term debt temporarily incurred to fund the maturity of UE’s $85 million 7.375% 2004 first mortgage bonds.

In December 2002, upon receipt of all necessary federal and state regulatory approvals, UE, pursuant to Missouri economic development statutes, conveyed most of its Peno Creek CT facility to the city of Bowling Green, Missouri in exchange for the issuance by the city of a taxable industrial development revenue bond in the amount of $103 million. Concurrently, the city leased back the facility to UE for a term of 20 years. The lease term is the same as the final maturity of the bond purchased by UE. Although the lease is a capital lease, no capital was raised in the transaction. UE is responsible for making rental payments under the lease in an amount sufficient to pay the debt service of the bond. The city's ownership of the facility during the term of the bond and the lease will result in property tax savings to UE. Under the terms of the lease, UE retains all operation and maintenance responsibilities for the facility and ownership of the facility is returned to UE at the expiration of the lease.

CIPS

In November 2004, CIPS issued, through the Illinois Finance Authority, $35 million of Series 2004 environmental improvement revenue refunding bonds due in 2025, currently in a variable-rate Dutch auction interest rate mode. These bonds are insured by a bond insurance policy and secured by first mortgage bonds (which are subject to fallaway provisions, as defined in the related financing agreements, similar to those which secure CIPS’ senior secured notes). As a result, the environmental improvement revenue refunding bonds were rated Aaa, AAA, and AAA by Moody’s, S&P, and Fitch, respectively. The proceeds received from the issuance of the $35 million Series 2004 bonds were used to redeem, at par, CIPS’ $35 million 6.375% 1993 Series A due 2028 pollution-control revenue bonds.

In December 2004, CIPS redeemed prior to maturity, $18 million of its 5.90% 1993 Series B-2 pollution control bonds due 2028 and $17 million of its $25 million 5.70% 1993 Series C-2 pollution control bonds due 2026. These redemptions were made with available cash and borrowings from the utility money pool agreement.

Ameren, UE and CIPS may sell all, or a portion of, the remaining securities registered under their open SEC registration statements if market conditions and capital requirements warrant. Any offer and sale will be made only by means of a prospectus meeting the requirements of the Securities Act of 1933 and its rules and regulations.

CILCORP

In conjunction with Ameren’s acquisition of CILCORP, CILCORP’s long-term debt was recorded at fair value. This resulted in recognition of fair-value adjustment increases of $71 million related to CILCORP’s 9.375% senior bonds due 2029 and $40 million related to its 8.70% senior notes due 2009. Amortization related to these fair value adjustments was $8 million for the year ended December 31, 2004 (2003 - $7 million), and was included in interest expense in the

119

Consolidated Statements of Income of Ameren and CILCORP.

In May 2004, CILCORP repurchased $15 million in principal amount of its 9.375% senior bonds. In July 2004, it repurchased an additional $2 million in principal amount of these bonds. In conjunction with these debt repurchases, the fair-value adjustment on these bonds was reduced by $5 million for the year ended December 31, 2004.

CILCO

In February 2004, CILCO repaid its secured bank term loan totaling $100 million with borrowings from the utility money pool agreement.

In November 2004, CILCO issued, through the Illinois Finance Authority, $19 million of Series 2004 environmental improvement revenue refunding bonds due in 2039, currently in a variable-rate Dutch auction interest rate mode. These bonds are insured by a bond insurance policy and are secured by first mortgage bonds (which are subject to fallaway provisions, as defined in the related financing agreements, similar to those included in the first mortgage bonds which secure UE’s and CIPS' senior secured notes). As a result, the environmental improvement revenue refunding bonds were rated Aaa, AAA, and AAA by Moody’s, S&P, and Fitch, respectively. The Series 2004 bonds are subject to a mandatory sinking fund redemption totaling $5 million at par on October 1, 2026, with the remainder of $14 million in principal amount due October 1, 2039. The proceeds received from the issuance were used to redeem CILCO’s $14 million 6.50% Series 1992 A due 2018 and $5 million 6.50% Series 1992 C due 2010 pollution control revenue bonds.

In conjunction with Ameren’s acquisition of IP, IP’s long-term debt was increased to fair value by $195 million. Amortization related to fair-value adjustments was $14 million for the year ended December 31, 2004 (2003 - $1 million) and was included in interest expense in the Consolidated Statements of Income of Ameren and IP.

In November 2004, pursuant to an equity clawback provision in the related bond indenture, IP redeemed

$192.5 million principal amount of its 11.50% Series mortgage bonds due 2010. The redemption price was equal to $1,115 per $1,000 principal amount, plus accrued and unpaid interest to the redemption date. Also in November 2004, IP completed a cash tender offer for $351 million of these bonds. The tender offer consideration paid was $1,214 per $1,000 principal amount plus accrued and unpaid interest to the settlement date. This tender offer satisfied IP’s indenture obligation to offer to purchase the bonds resulting from the change of control of IP upon its acquisition by Ameren. In December 2004, IP repurchased an additional $6.5 million principal amount of these bonds at a redemption price of $1,207 per $1000 principal amount plus accrued unpaid interest. At December 31, 2004, only $33,000 principal amount of these bonds remained outstanding.

In December 2004, IP redeemed $66 million principal amount of its 7.50% Series mortgage bonds due 2025 at a redemption price of 103.105% of the principal amount plus accrued interest and $84 million in principal amount of its 7.40% Series 1994 B pollution control bonds due 2024 at a redemption price of 102% of the principal amount plus accrued and unpaid interest. This indebtedness, along with the redemption and repurchase of the 11.50% Series mortgage bonds due 2010 described above, were funded by IP through equity contributions made by Ameren in the fourth quarter of 2004 totaling $871 million. In conjunction with these debt repurchases, the fair value adjustment on IP’s long-term debt was reduced by $103 million for the year ended December 31, 2004.

In December 1998, the IP SPT issued $864 million of TFNs as allowed under the Illinois Electric Utility Transition Funding Law. In accordance with the Transitional Funding Securitization Financing Agreement, IP must designate a portion of the cash received from customer billings to fund payment of the TFNs. The amounts received are remitted to the IP SPT and are restricted for the sole purpose of paying down the TFNs. Due to the adoption of FIN No. 46R and resulting deconsolidation of IP SPT, certain amounts of restricted cash are netted against the current portion of IP’s long-term debt payable to IP SPT on IP’s December 31, 2004 and 2003, consolidated balance sheets.

In September 1999, IP entered into an operating lease on four gas turbines located in Tilton, Illinois and a separate land lease at the Tilton site. IP sublet the turbines to a predecessor of DMG in October 1999. In July 2004, subsequent to the expiration of a statutory notice period after a filing at the ICC, IP terminated its lease with the original lessor. DMG then executed a transfer agreement under which the original lessor sold the turbine assets to DMG for the full contract price of $81 million. Additionally, IP assigned its associated land lease on the Tilton site to a predecessor of DMG. For additional information relating to the Tilton capital lease and related asset retirement obligation liability and remeasurement, see Note 1 - Summary of Significant Accounting Policies.

EEI

In June 2004, EEI repaid its $40 million bank term loan at maturity with proceeds received from EEI’s credit facilities.

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In December 2004, EEI repaid $6 million of its 8.60% medium-term notes and $8 million of its 6.61% medium-term notes with proceeds received from EEI’s credit facilities.

Indenture Provisions and Other Covenants

UE’s indenture agreements and articles of incorporation include covenants and provisions related to the issuances of first mortgage bonds and preferred stock. For the issuance of additional first mortgage bonds, earnings coverage of twice the annual interest charges on first mortgage bonds outstanding and to be issued is required. For the 12 months ended December 31, 2004, UE had a coverage ratio of 8.2 times the annual interest charges on the first mortgage bonds outstanding, which would permit UE to issue an additional $3.7 billion of first mortgage bonds at an assumed interest rate of 7%. For the issuance of additional preferred stock, earnings coverage of at least 2.5 times the annual dividend on preferred stock outstanding and to be issued is required under UE’s articles of incorporation. For the 12 months ended December 31, 2004, UE had a coverage ratio of 63 times the annual dividend requirement on preferred stock outstanding, which would permit UE to issue an additional $2 billion in preferred stock at an assumed dividend rate of 7%. The ability to issue such securities in the future will depend on such tests at that time.

In addition, UE’s mortgage indenture contains certain provisions that restrict the amount of common dividends that can be paid by UE. Under this mortgage indenture, $31 million of total retained earnings was restricted against payment of common dividends, except those dividends payable in common stock, which left $1.7 billion of free and unrestricted retained earnings at December 31, 2004.

CIPS

CIPS’ indenture agreements and articles of incorporation include covenants that must be complied with before first mortgage bonds and preferred stock are issued. For the issuance of additional first mortgage bonds, earnings coverage of twice the annual interest charges on first mortgage bonds outstanding and to be issued is required, except in certain cases when additional first mortgage bonds are issued on the basis of retired bonds. For the 12 months ended December 31, 2004, CIPS had a coverage ratio of 3.1 times the annual interest charges for one year on the aggregate amount of bonds outstanding. Consequently, the most restrictive test under the indenture agreements would allow CIPS to issue an additional $134 million of first mortgage bonds, assuming an interest rate of 7%. For the issuance of additional preferred stock, earnings coverage of 1.5 times annual interest charges on all long-term debt and the annual preferred stock dividends is required under CIPS’ articles of incorporation. For the 12 months ended December 31, 2004, CIPS had a coverage ratio of 2.1 times the sum of the annual interest charges and dividend requirements on all long-term debt and preferred stock outstanding as of December 31, 2004, and consequently had the availability to issue an additional $182 million of preferred stock, assuming a dividend rate of 7%. The ability to issue such securities in the future will depend on such coverage ratios at that time.

Genco

Genco’s senior note indenture includes provisions that require it to maintain a senior debt service coverage ratio of at least 1.75 to 1 (for both the prior four fiscal quarters and for the succeeding four six-month periods) in order to pay dividends or to make payments of principal or interest under certain subordinated indebtedness, excluding amounts payable under its intercompany note payable to CIPS. For the 12 months ended December 31, 2004, this ratio was 5.0 to 1. In addition, the indenture also restricts Genco from incurring any additional indebtedness, with the exception of certain permitted indebtedness defined in the indenture, unless its senior debt service coverage ratio equals at least 2.5 to 1 for the most recently ended four fiscal quarters and its senior debt to total capital ratio would not exceed 60% - both after giving effect to the additional indebtedness on a pro-forma basis. This debt incurrence restriction is to be disregarded if both Moody’s and S&P reaffirm the ratings of Genco in place at the time of debt incurrence after considering the additional indebtedness. As of December 31, 2004, Genco’s senior debt to total capital ratio was 53%.

CILCORP

Covenants in CILCORP's indenture governing its $475 million (original issuance amount) senior notes and bonds require CILCORP to maintain a debt-to-capital ratio no greater than 0.67 to 1 and an interest coverage ratio of at least 2.2 to 1 in order to make any payment of dividends or intercompany loans to affiliates other than to its direct and indirect subsidiaries, including CILCO. However, in the event CILCORP is not in compliance with these tests, CILCORP may make such payments of dividends or intercompany loans if its senior long-term debt rating is at least BB+ from S&P, Baa2 from Moody’s, and BBB from Fitch. For the 12 months ended December 31, 2004, CILCORP's debt-to-capital ratio was 0.58 to 1 and its interest coverage ratio was 2.3 to 1, calculated in accordance with applicable provisions of this indenture. At December 31, 2004, CILCORP’s senior long-term debt ratings from S&P, Moody’s, and Fitch were BBB+, Baa2, and BBB+, respectively. The common stock of CILCO is pledged as security to the holders of these senior notes and bonds.

CILCO

CILCO’s indenture agreement and articles of incorporation include covenants that must be compiled with before CILCO may issue first mortgage bonds and preferred stock. For the issuance of additional first mortgage bonds, an

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earnings coverage of twice the annual interest requirements on first mortgage bonds outstanding and to be issued, or earnings of at least 12% of the principal amount of all bonds

outstanding and to be issued is required, except in certain cases when additional first mortgage bonds are issued on the basis of retired bonds. For the 12 months ended December 31, 2004, CILCO had an earnings coverage ratio of 7.5 times the annual interest charges for one year on the aggregate amount of bonds outstanding or at least 53% of the principal amount of all mortgage bonds outstanding under the mortgage. Accordingly, the most restrictive test under the indenture agreement would allow CILCO to issue an additional $47 million of first mortgage bonds. For the issuance of additional shares of preferred stock, the articles of incorporation would allow CILCO to issue an additional $47 million of first mortgage bonds. For the issuance of additional shares of preferred stock, the articles of incorporation provide that no class of shares with rights superior to the currently issued preferred stock as to payment of dividends or as to assets shall be issued, unless the net income available for the payment of the dividends for a period of 12 consecutive calendar months within the 15 months immediately preceding the issuance shall be at least 2 ½ times the annual dividend requirements of all then-outstanding shares of preferred stock. Consequently, the most restrictive test under which CILCO could issue additional shares of preferred stock would allow CILCO to issue additional preferred stock in the amount of $155 million.

IP’s indenture agreements and articles of incorporation include covenants and provisions related to the issuance of first mortgage bonds and preferred stock. For the issuance of additional first mortgage bonds based on property additions, earnings coverage of twice the annual interest charges on first mortgage bonds outstanding and to be issued is required. For the 12 months ended December 31, 2004, IP had a coverage ratio of 1.88 times the annual interest charges on the first mortgage bonds outstanding, which would not permit IP to issue any additional first mortgage bonds based on property additions. However, as of December 31, 2004, IP had the ability to issue $1.3 billion of bonds based upon retired bond capacity, for which no earnings coverage test is required. For the issuance of additional preferred stock, earnings coverage of at least 1.5 times the annual dividend on preferred stock outstanding and to be issued is required under IP’s articles of incorporation. For the 12 months ended December 31, 2004, IP had a coverage ratio of 1.37 times the annual dividend requirement on preferred stock outstanding, which would not permit IP to issue any additional preferred stock. The ability to issue such securities in the future will depend on such tests at that time.

The IP SPT TFNs contain restrictions that prohibit IP LLC from making any loan or advance to, or certain investments in, any other person. Also, as long as the TFNs are outstanding, the IP SPT shall not, directly or indirectly, pay any dividend or make any distribution (by reduction of capital or otherwise) to any owner of a beneficial interest in the IP SPT.

See Note 3 - Rate and Regulatory Matters for restrictions on IP’s ability to declare and pay common stock dividends imposed by the ICC order approving Ameren’s acquisition of IP.

Off-Balance Sheet Arrangements

At December 31, 2004, none of the Ameren Companies had any off-balance sheet financing arrangements, other than operating leases entered into in the ordinary course of business. None of the Ameren Companies expect to engage in any significant off-balance sheet financing arrangements in the near future.

NOTE 7 - RESTRUCTURING CHARGES AND OTHER SPECIAL ITEMS

Ameren and UE recorded a pretax coal contract settlement gain of $51 million in 2003. This gain represented a return of coal costs plus accrued interest accumulated by a coal supplier for reclamation of a coal mine that supplied a UE power plant. UE entered into a settlement agreement with the coal supplier to return the accumulated reclamation funds, which were paid to UE ratably through December 2004.

CILCO recorded $2 million and $21 million in acquisition integration costs in 2004 and 2003, respectively. The 2004 costs primarily represented severance and relocation amounts. The 2003 costs represented write-offs of software without future benefit as of the acquisition date ($13 million), severance and relocation costs ($5 million), and an increase in the bad debt reserve related to one customer for which there was significant collection concern at the acquisition date ($3 million). These amounts were offset against goodwill at CILCORP through purchase accounting and, therefore, there was no impact to Ameren’s Consolidated Statement of Income.

Ameren recorded voluntary employee retirement and other restructuring charges of $92 million in 2002. These charges included a voluntary retirement program charge of $75 million based on voluntary retirements of approximately 550 employees. Of the $75 million charge, UE recorded $51 million, CIPS recorded $14 million, Genco recorded $8 million, and other Ameren companies recorded $2 million. These charges related primarily to special termination benefits associated with our pension and postretirement benefit plans. Most of the employees who voluntarily retired accepted retirement in 2002 and left Ameren in early 2003.

In addition, in 2002, Ameren recorded a charge of $17 million primarily associated with the retirement of 343 megawatts of rate-regulated generating capacity at UE’s Venice, Illinois plant and temporary suspension of operations of two coal-fired generating units (126 megawatts) at Genco’s Meredosia, Illinois plant.

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NOTE 8 - OTHER INCOME AND DEDUCTIONS

The following table presents Other Income and Deductions for each of the Ameren Companies for the years ended December 31, 2004, 2003 and 2002:


	2004			2003			2002
Ameren:^(a)
Miscellaneous income:
Interest and dividend income	$	18		$	10		$	8
Gain on disposition of property		-			-			3
Allowance for equity funds used during construction		10			4			6
Other		4			13			4
Total miscellaneous income	$	32		$	27		$	21
Miscellaneous expense:
Minority interest in subsidiary	$	(4	)	$	(7	)	$	(14	)
Donations, including 2002 UE electric rate settlement		(5	)		(5	)		(26	)
Other		-			(10	)		(10	)
Total miscellaneous expense	$	(9	)	$	(22	)	$	(50	)
UE:
Miscellaneous income:
Interest and dividend income	$	8		$	7		$	2
Equity in earnings of subsidiary		5			7			14
Gain on disposition of property		-			-			3
Allowance for equity funds used during construction		10			4			5
Other		2			5			7
Total miscellaneous income	$	25		$	23		$	31
Miscellaneous expense:
Donations, including 2002 electric rate settlement	$	(3	)	$	(2	)	$	(26	)
Other		(4	)		(5	)		(9	)
Total miscellaneous expense	$	(7	)	$	(7	)	$	(35	)
CIPS:
Miscellaneous income:
Interest and dividend income	$	24		$	27		$	31
Equity in earnings of subsidiary		-			-			1
Other		-			-			2
Total miscellaneous income	$	24		$	27		$	34
Miscellaneous expense:
Other	$	(1	)	$	(3	)	$	(2	)
Total miscellaneous expense	$	(1	)	$	(3	)	$	(2	)
Genco:
Miscellaneous expense:
Other	$	-		$	(1	)	$	-
Total miscellaneous expense	$	-		$	(1	)	$	-
CILCORP:^(b)
Miscellaneous income:
Interest and dividend income	$	1		$	1		$	-
Other		-			-			3
Total miscellaneous income	$	1		$	1		$	3
Miscellaneous expense:
Other	$	(5	)	$	(3	)	$	(2	)
Total miscellaneous expense	$	(5	)	$	(3	)	$	(2	)
CILCO:
Miscellaneous income:
Other	$	-		$	-		$	2
Total miscellaneous income	$	-		$	-		$	2
Miscellaneous expense:
Other	$	(5	)	$	(4	)	$	(2	)
Total miscellaneous expense	$	(5	)	$	(4	)	$	(2	)
IP:^(c)
Miscellaneous income:
Interest income from former affiliates	$	-		$	170		$	170
Interest and dividend income		1			7			2
Contribution in aid of construction		-			-			7
Allowance for equity funds used during construction		-			1			-
Other		-			5			6
Total miscellaneous income	$	1		$	183		$	185

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		2004		2003			2002
Miscellaneous expense:
Loss on disposition of property	$	-	$	-		$	(1	)
Other		-		(4	)		(10	)
Total miscellaneous expense	$	-	$	(4	)	$	(11	)

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; excludes amounts for CILCORP prior to the acquisition date of January 31, 2003; and includes amounts for Ameren Registrant and non-Registrant subsidiaries and intercompany eliminations.

(b)	2002 amounts represent predecessor information. January 2003 predecessor amounts were zero. CILCORP consolidates CILCO and therefore includes CILCO amounts in its balances.

(c)	2003 and 2002 amounts represent predecessor information. January through September 2004 predecessor miscellaneous income and expense amounts were $144 million and $1 million, respectively.

NOTE 9 - DERIVATIVE FINANCIAL INSTRUMENTS

We use derivatives principally to manage the risk of changes in market prices for natural gas, fuel, electricity and emission credits. Price fluctuations in natural gas, fuel, and electricity cause:

·	an unrealized appreciation or depreciation of our firm commitments to purchase or sell when purchase or sale prices under the firm commitment are compared with current commodity prices;

·	market values of fuel and natural gas inventories or purchased power to differ from the cost of those commodities in inventory under firm commitment; and

·	actual cash outlays for the purchase of these commodities to differ from anticipated cash outlays.

The derivatives that we use to hedge these risks are approved by risk management policies that control the use of forward contracts, futures, options and swaps. Our net positions are continually assessed within our structured hedging programs to determine if new or offsetting transactions are required. The goal of the hedging program is generally to mitigate financial risks while ensuring sufficient volumes are available to meet our requirements.

Certain derivative contracts are entered into on a regular basis as part of our risk management program but do not qualify for hedge accounting or the normal purchase and sale exceptions under SFAS No. 133, “Accounting for Derivative Instruments and Hedging Activities,” as amended. Accordingly, these contracts are recorded at fair value with changes in the fair value charged or credited to the income statement in the period in which the change occurred. Contracts we enter into as part of our risk management program may be settled financially, by physical delivery, or net settled with the counterparty.

Cash Flow Hedges

Our risk management processes identify the relationships between hedging instruments and hedged items, as well as the risk management objective and strategy for undertaking various hedge transactions. The mark-to-market value of cash flow hedges will continue to fluctuate with changes in market prices up to contract expiration.

We monitor and value derivative positions daily as part of our risk management processes. We use published sources for pricing when possible to mark positions to market. We rely on modeled valuations only when no other method exists.

The following table presents balances in certain accounts for cash flow hedges as of December 31, 2004 and 2003:


	Ameren^(a)		UE		CIPS		Genco		CILCORP		CILCO
2004:
Balance Sheet:
Other assets	$	35	$	4	$	6	$	6	$	14	$	14
Other deferred credits and liabilities		14		14		-		-		-		-
Accumulated OCI:
Power forwards^(b)		-		-		-		-		-		-
Interest rate swaps^(c)		4		-		-		4		-		-
Gas swaps and future contracts^(d)		26		4		6		-		11		11
Call options^(e)		-		-		-		-		-		-
2003:
Balance Sheet:
Other assets	$	16	$	2	$	1	$	6	$	-	$	6
Other deferred credits and liabilities		4		3		-		1		-		-

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	Ameren^(a)		UE		CIPS		Genco		CILCORP		CILCO
Accumulated OCI:
Power forwards^(b)	$	3	$	-	$	-	$	3	$	-	$	-
Interest rate swaps^(c)		5		-		-		5		-		-
Gas swaps and futures contracts^(d)		6		-		1		-		-		5
Call options^(e)		2		2		-		-		-		-

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; excludes amounts for CILCORP prior to the acquisition date of January 31, 2003; and includes amounts for Ameren Registrant and non-Registrant subsidiaries and intercompany eliminations.

(b)	Represents the mark-to-market value for the hedged portion of electricity price exposure for periods generally less than one year. Certain contracts designated as hedges of electricity price exposure have terms up to three years.

(c)	Represents a gain associated with interest rate swaps at Genco that were a partial hedge of the interest rate on debt issued in June 2002. The swaps cover the first 10 years of debt that has a 30-year maturity and the gain in OCI is amortized over a 10-year period that began in June 2002.

(d)	Represents a gain associated with natural gas swaps and futures contracts. The swaps are a partial hedge of our natural gas requirements through March 2008.

(e)	Represents the mark-to-market gain of two call options to purchase coal that are accounted for as cash flow hedges. One of these options to purchase coal expired in October 2003 and the other option expires in July 2005.

The pretax net gain or loss on power forward derivative instruments included in Other Income and (Deductions) at Ameren, UE and Genco, which represents the impact of discontinued cash flow hedges, the ineffective portion of cash flow hedges, and the reversal of amounts previously recorded in OCI due to transactions going to delivery or settlement, was less than $1 million loss for Ameren, UE and Genco for the year ended December 31, 2004 (2003 - less than a $1 million loss for Ameren, UE, and Genco).

Other Derivatives

The following table represents the net change in market value of option transactions, which are used to manage our positions in SO₂ allowances, coal, heating oil, and electricity or power. Certain of these transactions are treated as nonhedge transactions under SFAS No. 133. The net change in the market value of SO₂ options is recorded in Operating Revenues - Electric, while the net change in the market value of coal, heating oil and electricity or power options is recorded as Operating Expenses - Fuel and Purchased Power.


Gains (Losses)^(a)	2004			2003			2002
SO₂ options:
Ameren^(b)	$	(8	)	$	1		$	2
UE		(10	)		(2	)		3
Genco		2			3			(1	)
Coal options:
Ameren^(b)		-			1			1
UE		-			2			1
Power options:
Ameren^(b)		-			-			2
UE		-			-			1
Genco		-			-			1

(a)	Heating oil option gains and losses were less than $1 million for all periods shown above.

(b)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; excludes amounts for CILCORP prior to the acquisition date of January 31, 2003; and includes amounts for Ameren Registrant and non-Registrant subsidiaries and intercompany eliminations.

(c)	2002 amounts represent predecessor information. January 2003 predecessor amounts were zero.

Through the market allocation process, UE, CIPS, Genco, CILCO and IP have been granted FTRs associated with the advent of the MISO Day Two Market. Marketing Company has been granted FTRs for its participation in the PJM-Com Ed market. We sought and received FTRs with the intent to hedge (offset) congestion charges related to our physical electricity business. Depending on the congestion on the transmission grid and prices at various points on the grid, FTRs could result in either charges or credits. We use complex grid modeling tools to determine which FTRs we wish to nominate in the FTR allocation process. There is risk that we may incorrectly model the amount of FTRs we need, and there is the potential that some of the FTR hedges could be ineffective.

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NOTE 10 - STOCKHOLDER RIGHTS PLAN AND PREFERRED STOCK

Stockholder Rights Plan

Ameren’s board of directors has adopted a share purchase rights plan designed to assure stockholders of fair and equal treatment in the event of a proposed takeover. The rights are exercisable only if a person or group acquires 15% or more of Ameren’s outstanding common stock or announces a tender offer, which would result in ownership by a person or group of 15% or more of the Ameren common stock. Each right will entitle the holder to purchase one one-hundredth of a newly issued preferred stock at an exercise price of $180. If a person or group acquires 15% or more of Ameren’s outstanding common stock, each right will entitle its holder (other than such person or members of such group) to purchase, at the right’s then-current exercise price, a number of Ameren’s common shares having a market value of twice such price. In addition, if Ameren is acquired in a merger or other business combination transaction after a person or group has acquired 15% or more of Ameren’s outstanding common stock, each right will entitle its holder to purchase, at the right’s then-current exercise price, a number of the acquiring company’s common shares having a market value of twice such price. The acquiring person or group will not be entitled to exercise these rights. These rights expire in 2008. One right will accompany each new share of Ameren common stock prior to such expiration date.

Preferred Stock

All classes of UE’s, CIPS’, CILCO’s and IP’s preferred stock are entitled to cumulative dividends and have voting rights. Ameren has 100 million shares of $0.01 par value preferred stock authorized, with no shares outstanding. CIPS has 2.6 million shares of no par value preferred stock authorized, with no shares outstanding. UE has 7.5 million shares authorized of $1 par value preference stock and CILCO has 2 million shares authorized of no par value preference stock, with no such preference stock outstanding. IP has 5 million shares authorized of no par value serial preferred stock and 5 million shares authorized of no par value preference stock, with no such serial preferred stock and preference stock outstanding. No shares of preference stock have been issued by any of the Ameren Companies.

The following table presents the outstanding preferred stock of UE, CIPS, CILCO and IP that is not subject to mandatory redemption and is entitled to cumulative dividends and is redeemable, at the option of the issuer, at the prices presented as of December 31, 2004 and 2003:


	Redemption Price (per share)		2004		2003
UE:
Without par value and stated value of $100 per share, 25 million shares authorized
$3.50 Series 130,000 shares	$	110.00	$	13	$	13
$3.70 Series 40,000 shares		104.75		4		4
$4.00 Series 150,000 shares		105.625		15		15
$4.30 Series 40,000 shares		105.00		4		4
$4.50 Series 213,595 shares		110.00^(a)		21		21
$4.56 Series 200,000 shares		102.47		20		20
$4.75 Series 20,000 shares		102.176		2		2
$5.50 Series A 14,000 shares		110.00		1		1
$7.64 Series 330,000 shares		103.82^(b)		33		33
Total			$	113	$	113
CIPS:
With par value of $100 per share, 2 million shares authorized
4.00% Series 150,000 shares	$	101.00	$	15	$	15
4.25% Series 50,000 shares		102.00		5		5
4.90% Series 75,000 shares		102.00		8		8
4.92% Series 50,000 shares		103.50		5		5
5.16% Series 50,000 shares		102.00		5		5
6.625% Series 125,000 shares		100.00		12		12
Total			$	50	$	50
CILCO:
With par value of $100 per share, 1.5 million shares authorized
4.50% Series 111,264 shares	$	110.00	$	11	$	11
4.64% Series 79,940 shares		102.00		8		8
Total			$	19	$	19

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	Redemption Price (per share)		2004			2003
IP:^(c)
With par value of $50 per share, 5 million shares authorized
4.08% Series 225,510 shares	$	51.50	$	12		$	12
4.20% Series 143,760 shares		52.00		7			7
4.26% Series 104,280 shares		51.50		5			5
4.42% Series 102,190 shares		51.50		5			5
4.70% Series 145,170 shares		51.50		7			7
7.75% Series 191,765 shares		50.00		10			10
Total			$	46		$	46
Less: IP balances prior to acquisition date				-			(46)
Less: Shares of IP preferred stock owned by Ameren^(d)				(33	)		-
Total Ameren			$	195		$	182

(a)	In the event of voluntary liquidation, $105.50.

(b)	Beginning February 15, 2003, declining to $100 per share in 2012.

(c)	2003 amounts represent predecessor information.

(d)	Ameren purchased 662,924 shares of IP’s preferred stock on September 30, 2004. See Note 2 - Acquisitions for additional information.

The following table presents the outstanding preferred stock of CILCO that is subject to mandatory redemption, is entitled to cumulative dividends and is redeemable, at a determinable price on a fixed date or dates, at the prices presented as of December 31, 2004 and 2003, respectively:


	Redemption Price (per share)			2004		2003
CILCO:^(a)
Without par value and stated value of $100 per share, 3.5 million shares authorized:
5.85% Series 200,000 shares	$	100.00^(b)	⁾	$	20	$	21

(a)

Beginning July 1, 2003, this preferred stock became redeemable, at the option of CILCO, at $100 per share. A mandatory redemption fund was established on July 1, 2003. The fund provides for the redemption of 11,000 shares for $1.1 million on July 1 of each year through July 1, 2007. On July 1, 2008, the remaining shares outstanding will be retired for $16.5 million.

(b)	In the event of voluntary or involuntary liquidation, the stockholder receives $100 per share plus accrued dividends.

NOTE 11 - RETIREMENT BENEFITS

We have defined benefit and postretirement benefit plans covering substantially all employees of UE, CIPS, CILCORP, CILCO, IP, EEI and Ameren Services and certain employees of Resources Company and its subsidiaries, including Genco. Ameren uses a measurement date of December 31 for its pension and postretirement benefit plans.

IP merged into the Ameren pension and postretirement plans during the fourth quarter of 2004. Previously, IP had been part of the Dynegy benefit plans, so the IP predecessor amounts below represent the components of IP’s participation in the Dynegy plans prior to Ameren’s acquisition of IP. Plan participants included not only employees of IP, but certain Illinova and DMG employees. IP was reimbursed by participating Dynegy subsidiaries for their respective shares of the expenses of these benefit plans. Effective with Ameren’s acquisition of IP, employees of the other Dynegy subsidiaries were not transferred into the Ameren plans and, therefore, are not included in successor information presented.

Investment Strategy and Return on Asset Assumption

The primary objective of the Ameren Retirement Plan and postretirement benefit plans is to provide eligible employees with pension and postretirement health care benefits. Ameren manages plan assets in accordance with the “prudent investor” guidelines contained in the ERISA. Ameren’s goal is to earn the highest possible return on plan assets consistent with its tolerance for risk. Ameren delegates investment management to specialists in each asset class. Where appropriate, Ameren provides the investment manager with specific guidelines that specify allowable and prohibited investment types. Ameren regularly monitors manager performance and compliance with investment guidelines.

The expected return on plan assets is based on historical and projected rates of return for current and planned asset classes in the investment portfolio. Assumed projected rates of return for each asset class were selected after an analysis of historical experience and future expectations of the returns and the volatility of the various asset classes. Depending on the target asset allocation for each asset class, the overall expected rate of return for the portfolio was adjusted for historical and expected experience of active portfolio management results compared to benchmark returns and for the effect of expenses paid from plan assets.

Pension

Pension benefits are based on the employees’ years of service and compensation. Our plans are funded in compliance with income tax regulations and federal funding requirements.

127

The following table presents the cash contributions made to our defined benefit retirement plan qualified trusts during 2004 and 2003. The current-year contribution provided cost savings to us by eliminating the need to pay a portion of insurance premiums to the Pension Benefit Guarantee Corporation.


	2004		2003
Ameren^(a)	$	295	$	27
UE		186		18
CIPS		33		4
Genco		29		3
CILCORP^(b)		41		-
CILCO		41		-

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; excludes amounts for CILCORP and CILCO prior to the acquisition date of January 31, 2003; includes amounts for Ameren Registrant and non-Registrant subsidiaries and intercompany eliminations.

(b)	CILCORP consolidates CILCO and therefore includes CILCO amounts in its balances.

A minimum pension liability was recorded at December 31, 2002, which resulted in an after-tax charge to OCI and a reduction in stockholders’ equity of $102 million. In 2003, the minimum pension liability was reduced, resulting in OCI of $46 million and an increase in stockholders’ equity. In 2004, the minimum pension liability was increased, resulting in a charge to OCI of $6 million and a decrease in stockholders’ equity.

The following table presents the minimum pension liability amounts, after taxes, as of December 31, 2004 and 2003:


	2004		2003
Ameren^(a)	$	62	$	56
UE		36		34
CIPS		8		7
Genco		4		4
CILCORP^(b)		-		-
CILCO		17		13
IP^(c)		-		10

(a) Excludes amounts for IP prior to the acquisition date of September 30, 2004; and includes amounts for Ameren Registrant and non-Registrant subsidiaries.

(b) CILCORP consolidates CILCO and therefore includes CILCO amounts in its balances.

The following tables present the funded status of our pension plans for the years ended December 31, 2004 and 2003:


	Ameren^(a)			IP^(b)
2004:
Change in benefit obligation:
Projected benefit obligation at beginning of year	$	2,142		$	629
Service cost		46			12
Interest cost		142			28
Plan amendments		16			-
Actuarial (gain) loss		150			(38	)
Transfer of IP into Ameren plan		606			(606	)
Special termination benefits		4			-
Benefits paid		(126	)		(25	)
Projected benefit obligation at end of year		2,980			-
Change in plan assets:
Fair value of plan assets at beginning of year		1,493		$	542
Actual return on plan assets		216			13
Transfer of IP into Ameren plan		485			(485	)
Allocated to Dynegy per ERISA Section 4044		-			(52	)
Employer contributions		295			7
Benefits paid^(c)		(124	)		(25	)
Fair value of plan assets at end of year		2,365			-
Funded status - deficiency		615			-
Unrecognized net actuarial loss		(311	)		-
Unrecognized prior service cost		(85	)		-
Unrecognized net transition asset		1			-
Accrued pension cost at December 31, 2004	$	220		$	-

	Ameren^(a)(d)			IP^(b)
2003:
Change in benefit obligation:
Projected benefit obligation at beginning of year	$	1,638		$	574
Service cost		39			13
Interest cost		131			36
Plan amendments		20			1
Actuarial loss		121			38
Addition from CILCO		355			-
Special termination benefits		2			-
Benefits paid		(164	)		(33	)
Projected benefit obligation at end of year	$	2,142		$	629

128


		Ameren^(a)(d)			IP^(b)	⁾
Change in plan assets:
Fair value of plan assets at beginning of year	$	1,100		$	476
Actual return on plan assets		292			99
Addition from CILCO		236			-
Employer contributions		27			-
Benefits paid^(c)		(162	)		(33	)
Fair value of plan assets at end of year		1,493			542
Funded status - deficiency		649			87
Unrecognized net actuarial loss		(268	)		(104	)
Unrecognized prior service cost		(80	)		(6	)
Unrecognized net transition asset		2			4
Accrued (prepaid) pension cost at December 31, 2003	$	303		$	(19	)

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; includes amounts for Ameren Registrant and non-Registrant subsidiaries.

(b)	Represents predecessor information.

(c)	Excludes amounts paid from company funds.

(d)	Excludes amounts for CILCORP and CILCO prior to the acquisition date of January 31, 2003; includes amounts for Ameren Registrant and non-Registrant subsidiaries.

The following table presents the assumptions used to determine benefit obligations at December 31, 2004 and 2003:


	2004	2003
Ameren, UE, CIPS, Genco, CILCORP, CILCO and IP^(a):
Discount rate at measurement date	5.75%	6.25%
Increase in future compensation	3.00	3.25
IP^(b):
Discount rate at measurement date	(b)	6.00%
Increase in future compensation	(b)	4.50

(a) 2003 amounts do not include IP.

(b) Included in Ameren’s plan at December 31, 2004. 2003 amounts represent predecessor information.

Based on our assumptions at December 31, 2004, we expect to be required under ERISA to fund an aggregate of $400 million for the period of 2005 to 2009, in order to maintain minimum funding levels for our pension plan with no minimum contribution required until 2008, assuming continuation of the current interest rate relief beyond 2005. We expect UE’s, CIPS’, Genco’s, CILCO’s, and IP’s portion of the future funding requirements to be approximately 50%, 9%, 9%, 11%, and 21%, respectively. These amounts are estimates and may change with actual stock market performance, changes in interest rates, any pertinent changes in government regulations, and any prior voluntary contributions.

The following tables present the amounts recorded in the Consolidated Balance Sheets as of December 31, 2004 and 2003:


	Ameren
2004:
Accrued pension liability	$ 409
Prepaid benefit cost	-
Intangible asset	(88)
Accumulated OCI	(101)
Accrued pension cost at December 31, 2004	$ 220
		Ameren^(a)			IP^(b)	⁾
2003:
Accrued pension liability	$	479		$	38
Prepaid benefit cost		-			(39	)
Intangible asset		(85	)		(2	)
Accumulated OCI		(91	)		(16	)
Accrued pension cost at December 31, 2003	$	303		$	(19	)

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004.

(b)	Represents predecessor information.

129

The following table presents our pension plan asset categories as of December 31, 2004 and 2003 and our target allocations for 2005:

Asset Category	Target Allocation 2005	Percentage of Plan Assets at December 31,
Asset Category	Target Allocation 2005	2004	2003
Ameren, UE, CIPS, Genco, CILCORP, CILCO and IP^(a):
Equity securities	40% - 80%	62%	63%
Debt securities	15 - 50	30	31
Real estate	0 - 10	5	4
Other	0 - 15	3	2
Total		100%	100%
IP^(b): Equity securities	(b)	(b)	64%
Debt securities	(b)	(b)	28
Real estate	(b)	(b)	5
Other	(b)	(b)	3
Total			100%

(a) 2003 amounts do not include IP.

(b) Included in Ameren’s plan at December 31, 2004; 2003 amounts represent predecessor information.

The following table presents the projected benefit obligation, the accumulated benefit obligation and the fair value of plan assets for plans that have a projected benefit obligation and accumulated benefit obligation in excess of plan assets at December 31, 2004 and 2003:


	2004			2003
Ameren, UE, CIPS, Genco, CILCORP, CILCO and IP^(a):
Projected benefit obligation	$	2,980		$	2,142
Accumulated benefit obligation		2,775			1,971
Fair value of plan assets		2,365			1,493
IP^(b): Projected benefit obligation		(b	)		629
Accumulated benefit obligation		(b	)		559
Fair value of plan assets		(b	)		542

(a) 2003 amounts do not include IP.

(b) Included in Ameren’s plan at December 31, 2004; 2003 amounts represent predecessor information.

The following table presents the components of the net periodic pension benefit cost during 2004, 2003 and 2002:


	Ameren^(a)`			IP^(b)
2004:
Service cost	$	46		$	12
Interest cost		142			28
Expected return on plan assets		(133	)		(35	)
Amortization of:
Transition asset		(1	)		(1	)
Prior service cost		11			1
Actuarial loss		24			2
Net periodic benefit cost		89			7
Net periodic benefit cost, including special termination benefits^(e)	$	93		$	7

	Ameren^(c)			IP^(d)
2003:
Service cost	$	39		$	13
Interest cost		131			36
Expected return on plan assets		(127	)		(50	)
Amortization of:
Transition asset		(1	)		(1	)
Prior service cost		9			1
Actuarial loss		8			-
Net periodic benefit cost (income)		59			(1	)
Net periodic benefit cost (income), including special termination benefits	$	61		$	(1	)

130


	Ameren^(c)			CILCORP^(d)			CILCO			IP^(d)
2002:
Service cost	$	35		$	4		$	4		$	10
Interest cost		106			22			22			36
Expected return on plan assets		(117	)		(25	)		(25	)		(57	)
Amortization of:
Transition asset		(1	)		-			(1	)		(3	)
Prior service cost		9			-			1			1
Actuarial (gain) loss		(12	)		1			-			(4	)
Net periodic benefit cost (income)		20			2			1			(17	)
Net periodic benefit cost (income), including special termination benefits	$	85		$	2		$	1		$	(17	)

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; includes amounts for Ameren Registrant and non-Registrant subsidiaries.

(b)	Represents predecessor information for the first nine months of 2004.

(c)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; excludes amounts for CILCORP prior to the acquisition date of January 31, 2003; includes amounts for Ameren Registrant and non-Registrant subsidiaries.

(d)	Represents predecessor information. CILCORP consolidates CILCO and therefore includes CILCO amounts in its balances.

(e)	Special termination benefits are deferred as a regulatory asset. See Note 3 - Rate and Regulatory Matters.

Prior service cost is amortized on a straight-line basis over the average future service of active participants benefiting under the plan. The net actuarial (gain) loss subject to amortization is amortized on a straight-line basis over 10 years.

UE, CIPS, Genco, CILCORP, CILCO and IP are participants in Ameren’s plans and are responsible for their proportional share of the costs. The following table presents the pension costs (benefits) incurred for the years ended December 31, 2004, 2003 and 2002:


	2004		2003			2002
Ameren^(a)	$	89	$	59		$	20
UE		54		35			12
CIPS		11		7			3
Genco		8		5			2
CILCORP^(b)		14		7			2
CILCO		22		17			1
IP^(c)		9		(1	)		(17	)

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; excludes amounts for CILCORP prior to the acquisition date of January 31, 2003; includes amounts for Ameren Registrant and non-Registrant subsidiaries.

(b)	Includes predecessor information for periods prior to the acquisition date of January 31, 2003. CILCORP consolidates CILCO and therefore includes CILCO amounts in its balances.

(c)	Includes predecessor information for periods prior to the acquisition date of September 30, 2004. Predecessor amount in 2004 is $7 million.

The expected pension benefit payments from qualified trust and company funds, which reflect expected future service, are as follows:


	Pension from Qualified Trust		Pension from Company Funds
2005	$	162	$	2
2006		165		2
2007		168		2
2008		173		2
2009		177		2
2010 - 2014		987		8

The following table presents the assumptions used to determine net periodic benefit cost for the years ended December 31, 2004, 2003, and 2002:


	2004	2003	2002
Ameren, UE, CIPS , Genco, CILCORP, CILCO and IP^(a):
Discount rate at measurement date	6.25%	6.75%	7.25%
Expected return on plan assets	8.50	8.50	8.50
Increase in future compensation	3.25	3.75	4.25
CILCORP^(b) and CILCO:
Discount rate at measurement date	(b)	(b)	7.00%
Expected return on plan assets	(b)	(b)	9.00
Increase in future compensation	(b)	(b)	3.50
IP^(c):
Discount rate at measurement date	6.00%	6.50%	7.50%
Expected return on plan assets	8.75	9.00	9.50
Increase in future compensation	4.50	4.50	4.50

(a)	2003 amounts do not include IP. 2002 amounts do not include CILCORP or CILCO.

(b)	Included in Ameren’s plan for 2003 and 2004. Represents predecessor information for 2002.

(c)	Included in Ameren’s plan for 2004. Represents predecessor information for 2003 and 2002.

131

Postretirement

Our policy for postretirement benefits is primarily to fund the Voluntary Employee Beneficiary Association trusts (VEBA) to match the annual postretirement expense.

The following table presents the cash contributions made to our postretirement plan during 2004. We made cash contributions of $70 million in 2003, excluding predecessor IP. IP contributions in 2003 were $6 million. We expect to make contributions of $75 million during 2005.


	2004
Ameren^(a)	$	69
UE		44
CIPS		8
Genco		3
CILCORP^(b)		8
CILCO		8
IP^(c)		6

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; includes amounts for Ameren Registrant and non-Registrant Ameren subsidiaries.

(b)	CILCORP consolidates CILCO and therefore includes CILCO amounts in its balances.

(c)	There were no contributions made by predecessor IP during the first nine months of 2004.

The following tables present the funded status of Ameren’s postretirement benefit plans at December 31, 2004, and 2003:


	Ameren^(a)			IP^(b)
2004:
Change in benefit obligation:
Net benefit obligation at beginning of year	$	1,063		$	190
Service cost		17			4
Interest cost		65			8
Plan amendments		(23	)		-
Participant contributions		5			1
Actuarial (gain) loss		109			1
Reflection of Medicare Part D		(71	)		-
Transfer of IP into Ameren plan		197			(197	)
Special termination benefits		1			-
Benefits paid		(65	)		(7	)
Net benefit obligation at end of year		1,298			-
Change in plan assets :
Fair value of plan assets at beginning of year		476			79
Actual return on plan assets		43			-
Addition from IP		73			(73	)
Employer contributions		69			-
Participant contributions		5			1
Benefits paid^(c)		(62	)		(7	)
Fair value of plan assets at end of year		604			-
Funded status - deficiency		694			-
Unrecognized net actuarial loss		(406	)		-
Unrecognized prior service cost		75			-
Unrecognized net transition obligation^(e)		(16	)		-
Postretirement benefit liability at December 31, 2004	$	347		$	-

	Ameren^(a)(d)			IP^(b)
2003:
Change in benefit obligation:
Net benefit obligation at beginning of year	$	814		$	151
Service cost		14			4
Interest cost		64			10
Plan amendments		(14	)		-
Employee contributions		3			1
Actuarial loss		83			33
Addition from CILCO		156			-
Benefits paid		(57	)		(9	)
Net benefit obligation at end of year	$	1,063		$	190

132


	Ameren^(a)(d)			IP^(b)
Change in plan assets:
Fair value of plan assets at beginning of year	$	357		$	67
Actual return on plan assets		69			14
Addition from CILCO		33			-
Employer contributions		70			6
Employee contributions		3			1
Benefits paid^(c)		(56	)		(9	)
Fair value of plan assets at end of year		476			79
Funded status - deficiency		587			111
Unrecognized net actuarial loss		(406	)		(92	)
Unrecognized prior service cost		58			-
Unrecognized net transition obligation^(e)		(19	)		(18	)
Postretirement benefit liability at December 31, 2003	$	220		$	1

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; includes amounts for Ameren Registrant and non-Registrant subsidiaries.

(b)	Represents predecessor information.

(c)	Excludes amounts paid from company funds.

(d)	Excludes amounts for CILCORP and CILCO prior to the acquisition date of January 31, 2003; includes amounts for Ameren Registrant and non-Registrant subsidiaries.

(e)	Ameren’s transition obligation at December 31, 2004, is being amortized over the next 10 years.

The following table presents the assumptions used to determine the benefit obligations at December 31, 2004, and 2003:


	2004	2003
Ameren, UE, CIPS, Genco, CILCORP, CILCO and IP^(a):
Discount rate at measurement date	5.75%	6.25%
Medical cost trend rate (initial)	9.00	9.00
Medical cost trend rate (ultimate)	5.00	5.00
IP^(b):
Discount rate at measurement date	(b)	6.00%
Medical cost trend rate (initial)	(b)	10.00
Medical cost trend rate (ultimate)	(b)	5.50

(a)	2003 amounts do not include IP.

(b)	Included in Ameren’s plan at December 31, 2004; 2003 amounts represent predecessor information.

The following tables present the components of Ameren’s net periodic postretirement benefit cost as of December 31, 2004, 2003 and 2002:


	Ameren^(a)			IP^(b)
2004:
Service cost	$	17		$	4
Interest cost		65			8
Expected return on plan assets		(39	)		(5	)
Amortization of:
Transition obligation		2			1
Prior service cost		(4	)		-
Actuarial loss		33			4
Net periodic benefit cost	$	74		$	12

	Ameren^(c)			IP^(d)
2003:
Service cost	$	14		$	4
Interest cost		64			10
Expected return on plan assets		(36	)		(6	)
Amortization of:
Transition obligation		2			2
Prior service cost		(3	)		-
Actuarial loss		34			5
Net periodic benefit cost	$	75		$	15

133


	Ameren^(c)			CILCORP^(d)			CILCO			IP^(d)
2002:
Service cost	$	27		$	2		$	2		$	3
Interest cost		54			9			9			10
Expected return on plan assets		(32	)		(3	)		(3	)		(7	)
Amortization of:
Transition obligation		17			-			3			2
Actuarial loss		8			2			2			2
Net periodic benefit cost		74			10			13			10
Net periodic benefit cost, including special termination benefits	$	82		$	10		$	13		$	10

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; includes amounts for Ameren Registrant and non-Registrant subsidiaries.

(b)	Represents predecessor information for the first nine months of 2004.

(c)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; excludes amounts for CILCORP prior to the acquisition date of January 31, 2003; includes amounts for Ameren Registrant and non-Registrant subsidiaries.

(d)	Represents predecessor information. CILCORP consolidates CILCO and therefore includes CILCO amounts in its balances.

Prior service cost is amortized on a straight-line basis over the average future service of active plan participants benefiting under the postretirement plans. The net actuarial loss subject to amortization is amortized on a straight-line basis over 10 years.

Ameren adopted FSP SFAS 106-2 during the second quarter of 2004, retroactive to January 1, 2004, which resulted in the recognition of a federal subsidy for postretirement benefit costs related to prescription drug benefits. See Note 1 - Summary of Significant Accounting Policies. The effect of this subsidy was a reduction of various components of Ameren’s and principally UE’s net periodic postretirement benefit costs. Interest costs were reduced by $4 million and amortization of losses were reduced by $7 million. The impact of the subsidy on the expected return on plan assets was minimal.

UE, CIPS, Genco, CILCORP, CILCO and IP are responsible for their proportional share of the postretirement benefit costs. The following table presents the postretirement benefit costs for the years ended December 31, 2004, 2003 and 2002:


	2004		2003		2002
Ameren^(a)	$	74	$	75	$	74
UE		44		52		57
CIPS		9		9		12
Genco		3		2		4
CILCORP^(b)		14		10		10
CILCO		23		18		13
IP^(c)		15		15		10

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; excludes amounts for CILCORP prior to the acquisition date of January 31, 2003; includes amounts for Ameren Registrant and non-Registrant subsidiaries.

(b)	Includes predecessor information for periods prior to the acquisition date of January 31, 2003. CILCORP consolidates CILCO and therefore includes CILCO amounts in its balances.

(c)	Includes predecessor information for periods prior to the acquisition date of September 30, 2004. Predecessor amount in 2004 is $12 million.

The following expected postretirement benefit payments, which reflect expected future service, are as follows:


	Benefits from Qualified Trust		Benefits from Company Funds
2005	$	83	$	1
2006		81		1
2007		83		1
2008		85		1
2009		86		1
2010 - 2014		479		7

The following table presents our postretirement plan asset categories as of December 31, 2004 and 2003, and our target allocations for 2005:

Asset Category	Target Allocation	Percentage of Plan Assets at December 31,
Asset Category	2005	2004	2003
Ameren, UE, CIPS, Genco, CILCORP, CILCO and IP^(a):
Equity securities	40% - 80%	62%	57%
Debt securities	15 - 55	34	32
Other	0 - 15	4	11
Total		100%	100%

134

Asset Category	Target Allocation	Percentage of Plan Assets at December 31,
Asset Category	2005	2004	2003
IP:^(b)
Equity securities	(b)	(b)	75%
Debt securities	(b)	(b)	25
Total	(b)	(b)	100%

(a) 2003 amounts do not include IP.

(b) Included in Ameren’s plan at December 31, 2004. 2003 amounts represent predecessor information.

The following table presents the assumptions used to determine net periodic benefit cost for the years ended December 31, 2004, 2003 and 2002:


	2004	2003	2002
Ameren, UE, CIPS, Genco, CILCORP, CILCO and IP:^(a) Discount rate at measurement date	6.25%	6.75%	7.25%
Expected return on plan assets	8.50	8.50	8.50
Medical cost trend rate (initial)	9.00	10.00	5.25
Medical cost trend rate (ultimate)	5.00	5.00	5.25
CILCORP^(b)and CILCO:
Discount rate at measurement date	(b)	(b)	7.00%
Expected return on plan assets	(b)	(b)	9.00
Medical cost trend rate (initial)	(b)	(b)	11.50
Medical cost trend rate (ultimate)	(b)	(b)	5.00
IP:^(c)
Discount rate at measurement date	6.00%	6.00%	7.50%
Expected return on plan assets	8.75	9.00	9.50
Medical cost trend rate (initial)	10.00	10.00	9.30
Medical cost trend rate (ultimate)	5.50	5.50	5.50

(a)	2003 amounts do not include IP. 2002 amounts do not include CILCORP or CILCO.

(b)	Included in Ameren’s plan in 2003 and 2004. Represents predecessor information for 2002.

(c)	Included in Ameren’s plan in 2004. Represents predecessor information for 2003 and 2002.

Assumed health care cost trend rates have a significant effect on the amounts reported for health care plans. In addition, we have plan limits on the amount Ameren will contribute to future postretirement benefits. The following table presents the effects of a 1% change in assumed health care cost trend rates:


	1% Increase		1% Decrease
Ameren:
Effect on net periodic cost	$	3	$	(3	)
Effect on accumulated postretirement benefit obligation		47		(46	)

Other

Ameren and CIPS sponsor 401(k) plans for eligible employees. An IP plan was merged into the Ameren plan during the fourth quarter of 2004. The CILCO plan was merged into the Ameren plan at the beginning of 2004. The plans allow employees to contribute a portion of their base pay in accordance with specific guidelines. Ameren, CIPS and IP (predecessor) match a percentage of the employee contributions up to certain limits. Ameren’s and IP’s matching contributions to the 401(k) plans totaled $15 million and $2 million (predecessor), respectively, in 2004. Matching contributions to the Ameren, previous IP, and previous CILCO plans were $14 million, $2 million, and $1 million, respectively, in each of the years 2003 and 2002. CIPS’ matching contributions to its 401(k) plan were less than $1 million annually in 2004, 2003 and 2002.

NOTE 12 - STOCK-BASED COMPENSATION

Ameren has a long-term incentive plan for eligible employees called the Long-term Incentive Plan of 1998, which provides for the grant of options, performance awards, restricted stock, dividend equivalents, and stock appreciation rights. Restricted stock awards were granted in 2004, 2003 and 2002 as a component of our compensation programs. We applied APB Opinion No. 25 in accounting for our stock-based compensation for years prior to 2003. There have not been any stock options granted since December 31, 2000. Effective January 1, 2003, we prospectively adopted accounting for our stock-based compensation plans using the fair value recognition provisions of SFAS No. 123. See Note 1 - Summary of Significant Accounting Policies for further information.

Restricted Stock

Restricted stock awards in Ameren common stock may be granted under our long-term incentive plan. Upon the achievement of certain performance levels, the restricted

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stock award vests over a period of seven years, beginning at the date of grant, and includes provisions requiring certain stock ownership levels based on position and salary. An accelerated vesting provision included in this plan reduces the vesting period from seven years to three years. During 2004, 2003, and 2002, respectively, 135,340, 152,956, and 154,678 restricted stock awards were granted. The weighted-average fair value for restricted stock awards granted in 2004, 2003, and 2002 was $46.34, $39.74, and $42.50 per share, respectively. We record unearned compensation (as a component of stockholders’ equity) equal to the market value of the restricted stock on the date of grant and charge the unearned compensation to expense over the vesting period.

Stock Options

Ameren

Options in Ameren common stock may be granted under our long-term incentive plan at a price not less than the fair-market value of the common shares at the date of grant. Granted options vest over a period of five years, beginning at the date of grant, and provide for accelerated exercising upon the occurrence of certain events, including retirement. Outstanding options expire on various dates through 2010. Subject to adjustment, 4 million shares have been authorized to be issued or delivered under our long-term incentive plan. In accordance with APB Opinion No. 25, no compensation expense was recognized related to our stock options for 2004, 2003 and 2002.

The following table presents Ameren stock option activity during 2004, 2003 and 2002:


	2004		2003		2002
	Number of Shares	Weighted-average Option Price	Number of Shares	Weighted-average Option Price	Number of Shares	Weighted-average Option Price
Outstanding at beginning of year	1,499,676	$ 34.88	1,977,453	$ 35.10	2,241,107	$ 35.23
Granted	-	-	-	-	-	-
Exercised	1,088,437	35.44	477,777	35.78	260,324	36.11
Cancelled or expired	-	-	-	-	3,330	43.00
Outstanding at end of year	411,239	33.38	1,499,676	34.88	1,977,453	35.10
Exercisable at end of year	272,439	$ 34.59	1,032,001	$ 36.00	901,187	$ 36.97

The following table presents additional information about Ameren stock options outstanding at December 31, 2004:


	Options Outstanding			Options Exercisable
Exercise Price	Outstanding Shares	Weighted-average Life (Years)	Weighted-average Exercise Price	Exercisable Shares	Weighted-average Exercise Price
$ 31.00	267,775	5.0	$ 31.00	128,975	$ 31.00
36.625	89,575	4.0	36.625	89,575	36.625
38.50	1,605	2.1	38.50	1,605	38.50
39.25	43,974	3.2	39.25	43,974	39.25
43.00	8,310	0.8	43.00	8,310	43.00

The fair values of stock options were estimated using a binomial option-pricing model with the following assumptions:


Grant Date	Risk-free Interest Rate	Option Term	Expected Volatility	Expected Dividend Yield
2/11/00	6.81%	10 years	17.39%	6.61%
2/12/99	5.44	10 years	18.80	6.51
6/16/98	5.63	10 years	17.68	6.55
4/28/98	6.01	10 years	17.63	6.55
2/10/97	5.70	10 years	13.17	6.53
2/7/96	5.87	10 years	13.67	6.32

CILCORP

Prior to Ameren’s acquisition of CILCORP, employees of CILCORP and CILCO participated in the AES Stock Option Plan that provided for grants of AES common stock options to eligible participants. Under the terms of the plan, options were issued to purchase shares of AES common stock at a price equal to 100% of the market price at the date the option was granted. The

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options became eligible for exercise under various schedules. The following table presents CILCORP stock option activity during 2002:


	Predecessor 2002
	Shares	Weighted-average Exercise Price
Outstanding at beginning of year	566,445	$ 18.28
Granted	-	-
Exercised	-	-
Cancelled or expired	18,003	28.61
Outstanding at end of year	548,442	$ 17.94
Exercisable at end of year	528,062

Provisions of CILCORP bonus programs allowed for the cash-out of certain AES stock options in the event of an acquisition of CILCORP. CILCORP paid $3 million during 2003 for the cash-out of the entire 73,502 shares that were eligible under these provisions. All other outstanding options under the AES Stock Option Plan remain the sole obligation of AES.

The following table presents the assumptions that were used in the Black-Scholes valuation method for shares of AES common stock granted:


Year of Grant	Risk-free Interest Rate	Option Term	Expected Volatility	Expected Dividend Yield
2001	4.8%	8.2 years	86%	0%

Prior to Ameren’s acquisition of IP, certain IP employees participated in the equity compensation plans of Dynegy. On October 1, 2004, as a result of the acquisition, all unvested stock options granted to IP employees became null and void. The following table presents IP stock option activity:


Predecessor
	January 1, 2004 to September 30, 2004		For the year ended December 31, 2003		For the year ended December 31, 2002
	Number of Shares	Weighted-average Option Price	Number of Shares	Weighted-average Option Price	Number of Shares	Weighted-average Option Price
Outstanding at beginning of period	1,739,592	$ 24.59	1,606,086	$ 29.94	1,716,790	$ 29.92
Granted	42,987	3.06	335,500	1.77	-	-
Exercised	(143,141)	1.77	-	-	(16,497)	23.38
Cancelled, forfeited or expired	(1,616,844)	2.05	(201,994)	29.22	(94,207)	30.66
Outstanding at end of period^(a)	22,594	26.02	1,739,592	24.59	1,606,086	29.94
Exercisable at end of period^(a)	22,594	1.77	1,291,010	29.76	1,504,157	27.66
Weighted average fair value of options granted at market		4.07		1.54		-

(a)	The 22,594 exercisable options as of September 30, 2004, are an obligation of Dynegy; therefore, additional successor information is not presented.

The following table presents the assumptions that were used in the Black-Scholes valuation method for shares of Dynegy common stock granted:


Year of Grant^(a)	Risk-free Interest Rate	Option Term	Expected Volatility	Expected Dividend Yield
2003	3.92%	10 years	90%	n/a
2001	4.82	10 years	46	1%

(a) Assumptions for the 2004 grant are not presented as the expense associated with the options was negligible and the options were either cancelled or assumed by Dynegy.

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NOTE 13 - INCOME TAXES

The following table presents the effective tax rates on income before income taxes as a result of total income tax expense for each of the Ameren Companies for 2004, 2003 and 2002:


	2004	2003	2002
Ameren^(a)	34%	37%	38%
UE	36	36	36
CIPS	33	18	39
Genco	37	40	39
CILCORP^(b)	(218)	31	22
CILCO	14	38	36
IP^(c)	39	39	39

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; excludes amounts for CILCORP prior to the acquisition date of January 31, 2003.

(b)	Represents predecessor information for 2002.

(c)	Represents predecessor information for January - September 2004, 2003 and 2002.

The following table presents the principal reasons why the effective income tax rate differed from the statutory federal income tax rate for the years ended December 31, 2004, 2003 and 2002:


	Ameren^(a)	UE	CIPS	Genco	CILCORP^(b)	CILCO	IP^(c)
2004:
Statutory federal income tax rate:	35%	35%	35%	35%	35%	35%	35%
Increases (decreases) from:
Permanent Items^(d)	(2)	-	(1)	-	(151)	(16)	-
Depreciation differences	1	1	(1)	-	(41)	(4)	1
Amortization of investment tax credit	(1)	(1)	(3)	(1)	(32)	(3)	(1)
State tax	3	4	5	5	(12)	3	5
Other^(e)	(2)	(3)	(2)	(2)	(17)	(1)	(1)
Effective income tax rate	34%	36%	33%	37%	(218)%	14%	39%
2003:
Statutory federal income tax rate:	35%	35%	35%	35%	35%	35%	35%
Increases (decreases) from:
Depreciation differences	1	1	1	-	(1)	(1)	2
Amortization of investment tax credit	-	-	(4)	(1)	(4)	(2)	(1)
State tax	3	3	7	5	6	3	5
Resolution of state income tax matters	(1)	-	(21)	-	-	-	-
Other^(e)	(1)	(3)	-	1	(5)	3	(2)
Effective income tax rate	37%	36%	18%	40%	31%	38%	39%
2002:
Statutory federal income tax rate:	35%	35%	35%	35%	35%	35%	35%
Increases (decreases) from:
Depreciation differences	2	2	1	(1)	(4)	(2)	1
Amortization of investment tax credit	-	-	(3)	(3)	(5)	(2)	(1)
State tax	3	3	6	5	5	5	5
Other^(e)	(2)	(4)	-	3	(9)	-	(1)
Effective income tax rate	38%	36%	39%	39%	22%	36%	39%

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; excludes amounts for CILCORP prior to the acquisition date of January 31, 2003.

(b)	Represents predecessor information for 2002.

(c)	Represents predecessor information for January - September 2004, 2003 and 2002.

(d)	Permanent items primarily include FAS 106-2 Medicare Part D for Ameren, UE, CIPS, CILCORP and CILCO and a litigation settlement at CILCORP and CILCO.

(e)	CILCORP Other primarily includes low-income housing tax credits and company-owned life insurance.

The following table presents the components of income tax expense for the years ended December 31, 2004, 2003 and 2002:


	Ameren^(a)			UE			CIPS			Genco			CILCORP^(b)			CILCO			IP^(c)
2004:
Taxes currently payable (principally federal)	$	(57	)	$	97		$	6		$	6		$	(51	)	$	(35	)	$	50
Deferred taxes (principally federal)		350			117			11			60			45			43			40
Deferred investment tax credits, amortization		(11	)		(6	)		(1	)		(2	)		(2	)		(2	)		(1	)
Total income tax expense (benefit)	$	282		$	208		$	16		$	64		$	(8	)	$	6		$	89

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	Ameren^(a)			UE			CIPS			Genco			CILCORP^(b)			CILCO			IP^(c)
2003:
Taxes currently payable (principally federal)	$	313		$	254		$	25		$	22		$	19		$	53		$	101
Deferred taxes (principally federal)		11			3			(18	)		30			(6	)		(23	)		(23	)
Deferred investment tax credits, amortization		(11	)		(6	)		(1	)		(2	)		(2	)		(2	)		(1	)
Total income tax expense	$	313		$	251		$	6		$	50		$	11		$	28		$	77
Included in cumulative effect of change in accounting principle		(12	)		-			-			(12	)		(2	)		(16	)		(2	)
Included in Income Taxes on Statement of Income	$	301		$	251		$	6		$	38		$	9		$	12		$	75
2002:
Taxes currently payable (principally federal)	$	172		$	171		$	33		$	(41	)	$	14		$	31		$	139
Deferred taxes (principally federal)		74			28			(15	)		63			(5	)		(3	)		(34	)
Deferred investment tax credits, amortization		(9	)		(6	)		(1	)		(2	)		(2	)		(2	)		(1	)
Total income tax expense	$	237		$	193		$	17		$	20		$	7		$	26		$	104

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; excludes amounts for CILCORP prior to the acquisition date of January 31, 2003.

(b)	Represents predecessor information for 2002.

(c)	Represents predecessor information for January - September 2004, 2003 and 2002.

The following table presents the deferred tax assets and deferred tax liabilities recorded as a result of temporary differences at December 31, 2004 and 2003:


	Ameren^(a)			UE			CIPS			Genco			CILCORP^(b)			CILCO			IP^(c)
2004:
Accumulated deferred income taxes, net liability (asset):
Plant related	$	1,748		$	1,102		$	103		$	234		$	258		$	198		$	28
Deferred intercompany tax gain/basis step-up		-			-			149			(149	)		-			-			-
Regulatory assets (liabilities), net		45			55			(4	)		-			(6	)		(6	)		-
Capitalized taxes and expenses		394			149			53			60			90			(8	)		(7	)
Deferred benefit costs		(265	)		(46	)		2			2			(122	)		(64	)		(110	)
Other		(24	)		(42	)		(3	)		(1	)		(1	)		14			24
Total net accumulated deferred income tax liabilities	$	1,898		$	1,218		$	300		$	146		$	219		$	134		$	(65	)
2003:
Accumulated deferred income taxes, net liability (asset):
Plant related	$	1,634		$	1,123		$	78		$	210		$	228		$	162		$	275
Deferred intercompany tax gain/basis step-up		-			-			162			(162	)		-			-			630
Regulatory assets (liabilities), net		116			126			(6	)		-			(4	)		(4	)		(23	)
Capitalized taxes and expenses		388			135			59			54			93			(7	)		81
Deferred benefit costs		(223	)		(82	)		(4	)		(5	)		(122	)		(59	)		5
Other		(60	)		(12	)		(20	)		1			(12	)		11			25
Total net accumulated deferred income tax liabilities	$	1,855		$	1,290		$	269		$	98		$	183		$	103		$	993

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; excludes amounts for CILCORP prior to the acquisition date of January 31, 2003; and includes amounts for Ameren Registrant and non-Registrant subsidiaries and intercompany eliminations.

(b)	CILCORP consolidates CILCO and therefore includes CILCO in its balances.

(c)	Represents predecessor information for 2003.

Upon Ameren’s acquisition of IP, IP’s net accumulated deferred income tax liabilities and unamortized accumulated investment tax credits were eliminated. Subsequent to the acquisition, IP began recording new accumulated deferred tax assets and liabilities and had recorded net deferred income tax assets of $65 million as of December 31, 2004.

NOTE 14 - RELATED PARTY TRANSACTIONS

The Ameren Companies have engaged in, and may in the future engage in, affiliate transactions in the normal course of business. These transactions primarily consist of gas and power purchases and sales, services received or rendered, and borrowings and lendings. Transactions between affiliates are reported as intercompany transactions on their financial statements, but are eliminated in consolidation for Ameren’s financial statements. Below are the material related-party agreements.

Electric Power Supply Agreements

Under two electric power supply agreements, Genco is obliged to supply to Marketing Company, and Marketing Company, in turn, is obliged to supply to CIPS with all of the energy and capacity CIPS needs to offer service for resale to

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its native load customers at ICC-related rates and to fulfill its other obligations under all applicable federal and state tariffs or contracts. Any power not used by CIPS is sold by Marketing Company under various long-term wholesale and retail contracts. For native load, CIPS pays an annual capacity charge per megawatt (the greater of its forecasted peak demand or actual demand), plus an energy charge per megawatthour to Marketing Company. For fixed-price retail customers outside of the tariff, CIPS pays Marketing Company the price it receives under these contracts. The fees paid by CIPS to Marketing Company for native load and fixed-price retail customers and any other sales by Marketing Company under various long-term wholesale and retail contracts are passed through to Genco. In addition, under the power supply agreement between Genco and Marketing Company, Genco bears all generation-related operating risks, including plant performance, operations, maintenance, efficiency, employee retention, and other matters. There are no guarantees, bargain purchase options, or other terms that may convey to CIPS the right to use the property and plant of Genco. The expiration date for the agreement between CIPS and Marketing Company has been extended to December 31, 2006. The agreement between Genco and Marketing Company can be terminated by either party upon one year’s notice. This extension was required by the ICC in its order approving Ameren’s acquisition of CILCORP and CILCO.

In October 2003, in conjunction with CILCO’s transfer to AERG of substantially all of its generating assets, AERG entered into an electric power supply agreement to supply CILCO with sufficient power to meet its native load requirements. CILCO pays a monthly capacity charge per megawatt based on its system capacity requirements, plus an energy charge per megawatthour. The expiration date for this agreement has been extended to December 31, 2006. The ICC required this extension in its order approving Ameren’s acquisition of CILCORP and CILCO. Also in conjunction with CILCO’s generating asset transfer, a bilateral power supply agreement was entered into between AERG and Marketing Company. This agreement provides for AERG to sell excess power to Marketing Company for sales outside the CILCO control area, and it also allows Marketing Company to sell power to AERG to fulfill CILCO’s native load requirements.

CILCO had an agreement with CIPS for the purchase of 100 megawatts of capacity and firm energy for the months of January and June through September under a contract that commenced in January 2000 and expired in September 2003. This power was supplied by Genco through the Marketing Company, CIPS, and Genco electric power supply agreements discussed above.

UE, CIPS, IP and a nonaffiliated company are parties to a power supply agreement with EEI to purchase and sell capacity and energy. This agreement expires on December 31, 2005. Under a separate agreement that expires on December 31, 2005, CIPS resold its entitlements under the power supply agreement with EEI to Marketing Company. Marketing Company and certain nonaffiliated companies are parties to a power supply agreement with Midwest Electric Power, Inc., a subsidiary of EEI, to purchase capacity and energy. This agreement’s term is year to year on a calendar basis unless the purchasing parties unanimously agree to terminate their participation.

UE has a 150-megawatt power supply agreement with Marketing Company that expires December 31, 2005. UE also had a one-year 450-megawatt power supply agreement with Marketing Company that expired in May 2002 and another one-year 200 megawatt power supply agreement with Marketing Company that expired in May 2003. Power supplied by Marketing Company to UE through these agreements is being obtained from Genco.

In December 2003, the SEC approved an agency agreement between AERG and Marketing Company that authorizes Marketing Company, on behalf of AERG, to sell AERG’s excess generation or to purchase power needed to supply AERG customers.

In December 2004, Marketing Company and IP entered into an agency agreement that authorizes Marketing Company, on behalf of IP, to sell or purchase, as necessary, electric energy and capacity in the wholesale market for 2005 and 2006.

IP had a contract with a former affiliate, DMG, to supply power via purchase agreements that expired at the end of 2004. The purchased power agreement with DMG obliged DMG to provide power to IP up to the reservation amount, and at the same prices, even if DMG had individual units unavailable at various times.

IP is party to several commercial and industrial electric and gas sales agreements with DMG, which were entered into prior to Ameren’s acquisition of IP. These are typically yearly contracts that renew automatically unless cancelled by either party pursuant to a 30-day written notice.

Also prior to Ameren’s acquisition, IP purchased natural gas from Dynegy to serve its gas distribution business under a Gas Industry Standards Board master base contract that terminated October 1, 2004. Under this agreement, IP executed multiple transactions in 2002 and 2003 that covered deliveries for the yearly winter peak season from November through March. One transaction was executed in 2004 to provide deliveries from January to March 2004.

Interconnection and Transmission Agreements

UE, CIPS and IP are parties to an interconnection agreement for the use of their respective transmission lines and other facilities for the distribution of power. In addition, CILCO and IP are parties to a similar interconnection agreement. These agreements have no contractual expiration

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date but may be terminated by either party with three years notice.

IP is party to transmission and interconnection sales agreements with DYPM, a former affiliate, for the use of IP’s transmission lines and other facilities. The transmission sale agreements expire in April and June 2005. The interconnection sales agreements expire January 1, 2006. On October 1, 2004, pursuant to the sale of IP to Ameren, all continuing contracts with Dynegy and its affiliates became third-party agreements.

Joint Dispatch Agreement

UE and Genco jointly dispatch electric generation under a joint dispatch agreement among UE, Genco and CIPS. Under the agreement, each affiliate is permitted to use the cheapest generation available first, whether it be from UE or Genco. Each affiliate has the option to serve its load requirements from its own generation first, and then to allow access to any available generation to its affiliate. The joint dispatch agreement can be terminated by either party upon one year’s notice. In an order approving the transfer of UE’s Illinois-based utility businesses to CIPS (see Note 3 - Rate and Regulatory Matters), the MoPSC ordered UE to amend the joint dispatch agreement so that margins on short-term power sales will be determined by generation output as opposed to load. This will provide UE with a larger share of the margins on short-term sales of power from the combined generation of UE and Genco. Such an amendment is expected to provide to UE with additional annual margins ranging from $7 million to $24 million for UE’s share of short-term power sales. Such an amendment is expected to result in a corresponding reduction in Genco’s margins from its share of short-term power sales. However, this reduction is expected to be mitigated by margins received from additional power sales by Genco (through Marketing Company) to CIPS to serve the transferred UE Illinois-based electric utility business through the end of 2006 under the current power supply contracts.

The termination of the joint dispatch agreement, or modifications to it, could have a material effect on Ameren, UE or Genco. Modifications to or termination of the agreement would not have an immediate impact on Ameren because of UE’s Missouri electric rate moratorium, which ends June 30, 2006.

Any excess generation not used by UE or Genco through the joint dispatch agreement is sold to third parties through Ameren Energy, serving as each affiliate’s agent. Ameren Energy also acts as agent on behalf of UE and Genco to purchase power when they require it.

Support Services Agreements

Costs of support services provided by Ameren Services, Ameren Energy, and AFS to their affiliates, including wages, employee benefits, professional services, and other expenses are based on, or are an allocation of, actual costs incurred. Effective September 30, 2004, IP was added to the support services agreements with Ameren Services and AFS. Prior to this, IP operated under Dynegy’s consolidated group’s Services and Facilities Agreement, whereby other Dynegy affiliates exchanged with IP services such as financial, legal, information technology, and human resources, as well as shared facility space. IP services were exchanged at fully distributed costs and revenues were not recorded under this agreement. This agreement was terminated in conjunction with IP’s sale to Ameren.

Executory Tolling, Gas Sales, and Transportation Agreements

Under an executory tolling agreement, CILCO purchases steam, chilled water, and electricity from Medina Valley. In connection with this agreement, Medina Valley purchases gas to fuel its generating facility from AFS under a fuel supply and services agreement. Prior to September 2003, Medina Valley purchased gas from CILCORP Energy Services, Inc., a subsidiary of CILCORP that operated gas management services including commodity procurement and redelivery to retail customers, and gas transportation from CILCO.

Under a gas transportation agreement, Genco acquires gas transportation service from UE for its Columbia, Missouri CTs. This agreement expires in February 2016.

Notes Receivable from Former Affiliate

At December 31, 2004, there was no principal outstanding under IP’s $2.3 billion Note Receivable from Former Affiliate, as it was eliminated in connection with the sale of all of IP’s common stock and approximately 73% of its preferred stock to Ameren. Due to the prepayments described below, IP had no accrued interest at December 31, 2004 or 2003. In July, September, October and December 2003, Dynegy made interest payments totaling $256 million on its $2.3 billion intercompany note payable to Illinova, which in turn made interest payments totaling $256 million to IP under the Note Receivable from Former Affiliate. These interest payments represented accrued interest on the notes for the months of April through December 2003 and prepaid interest for the months of January 2004 through September 2004. In January 2004, IP received an additional interest prepayment of $43 million. These notes contained payment provisions pursuant to which semi-annual interest payments of $86 million were due on April 1 and October 1 of each year. See Note 2 - Acquisitions for further information.

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Transitional Funding Securitization Financing Agreement

IP's financial statements include related-party transactions with the IP SPT, its wholly owned unconsolidated subsidiary, which was deconsolidated in accordance with the adoption of FIN No. 46R effective on December 31, 2003. In accordance with the Transitional Funding Securitization Financing Agreement, IP must designate a portion of the cash received from customer billings to fund payment of the TFNs. The amounts received are remitted to the IP SPT and are restricted for the sole purpose of paying down the TFNs. Due to the adoption of FIN No. 46R and resulting deconsolidation of IP SPT, these amounts are netted against the current portion of IP’s long-term debt payable to IP SPT on IP’s December 31, 2004 consolidated balance sheet. See Note 1 - Summary of Significant Accounting Policies for further information.

Money Pools

Utility

UE, CIPS, CILCO and IP have the ability to borrow from Ameren and from each other through a utility money pool agreement. Ameren Services administers the utility money pool and tracks internal and external funds separately. Ameren Services also participates in the utility money pool. Ameren and AERG may participate in the utility money pool only as lenders. Internal funds are surplus funds contributed to the utility money pool from participants. The primary source of external funds for the utility money pool is the UE commercial paper program. Through the utility money pool, the pool participants can access committed credit facilities at Ameren that totaled $935 million at December 31, 2004. These facilities are in addition to UE’s $154 million, CIPS’ $15 million, and CILCO’s $60 million in committed credit facilities, which are also available to the utility money pool participants. Based on outstanding UE commercial paper borrowings at December 31, 2004, $789 million was available for borrowing under Ameren credit facilities through the utility money pool agreement. The total amount available to the pool participants from the utility money pool at any given time is reduced by the amount of borrowings by their affiliates, but increased to the extent the pool participants have surplus funds or other external sources are used to increase the available amounts. The availability of funds is also determined by funding requirement limits established by the SEC under the PUHCA. UE, CIPS, CILCO, IP and Ameren Services rely on the utility money pool to coordinate and provide for certain short-term cash and working capital requirements. Borrowers receiving a loan under the utility money pool agreement must repay the principal amount of such loan, together with accrued interest. The rate of interest depends on the composition of internal and external funds in the utility money pool. The average interest rate for borrowing under the utility money pool for the year ended December 31, 2004 was 1.38% (2003 - 1.14%).

On September 30, 2004, in conjunction with the completion on that date of Ameren’s acquisition of IP, a unilateral borrowing agreement was entered into between Ameren, IP, and Ameren Services that enables IP to make short-term borrowings directly from Ameren. The aggregate amount of borrowings outstanding at any time by IP under the unilateral borrowing agreement and the utility money pool agreement, together with any short-term borrowings by IP, may not exceed $500 million, pursuant to authorization from the ICC and the SEC under the PUHCA. Ameren Services is responsible for operation and administration of the agreement. At December 31, 2004, IP had loaned $140 million to the utility money pool.

Non-state-regulated subsidiaries

Genco and other non-state-regulated Ameren subsidiaries have the ability to borrow up to $935 million in total from Ameren through a non-state-regulated subsidiary money pool agreement. However, the total amount available to the pool participants at any time is reduced by the amount of borrowings from Ameren by its subsidiaries and is increased to the extent that other pool participants advance surplus funds to the non-state-regulated subsidiary money pool or external sources are used to increase the available amounts. At December 31, 2004, $789 million was available through the non-state-regulated subsidiary money pool, excluding additional funds available through excess cash balances. The non-state-regulated subsidiary money pool was established to coordinate and provide for short-term cash and working capital requirements of Ameren’s non-state-regulated activities. It is administered by Ameren Services. Borrowers receiving a loan under the non-state-regulated subsidiary money pool agreement must repay the principal amount of such loan, together with accrued interest. The rate of interest depends on the composition of internal and external funds in the non-state-regulated subsidiary money pool. These rates are based on the cost of funds used for money pool advances. Ameren and CILCORP are authorized to act only as lenders to the non-state-regulated subsidiary money pool. In October 2003, AERG received the required regulatory approval necessary to participate in the non-state-regulated subsidiary money pool. The average interest rate for borrowing under the non-state-regulated subsidiary money pool for year ended December 31, 2004 was 8.84% (2003 - 8.84%).

CILCORP has been granted authority by the SEC under the PUHCA to borrow up to $250 million directly from Ameren in a separate arrangement unrelated to the money pools. At December 31, 2004, CILCORP had notes payable under this agreement of $72 million (2003 - $46 million) at an average interest rate of 8.84% for the year ended December 31, 2004.

142

Intercompany Promissory Notes

As of December 31, 2004, Genco has affiliate notes payable of $249 million and $34 million to CIPS and Ameren, respectively, which, by their current terms, have final payments of principal and interest due on May 1, 2005. These notes bear interest at 7%. In November 2004, Genco made a $75 million principal prepayment under its note payable to CIPS. The note payable to CIPS was issued in conjunction with the transfer of its electric generating assets and related liabilities to Genco. Genco and CIPS plan to renew or modify the CIPS note to extend the principal maturity to May 1, 2010, which is expected to include continued amortization of the principal amount. Genco and Ameren are currently evaluating various alternatives with respect to the note payable to Ameren. In the event the maturities of these notes are not extended or restructured, Genco may need to access other financing sources to meet the maturity obligation to the extent it does not have cash available from its operating cash flows. Such sources of financing could include borrowings under the non-state-regulated subsidiary money pool, or infusion of equity capital or new direct borrowings from Ameren, all subject to applicable regulatory financing authorizations and provisions in Genco’s senior note indenture.

Operating Leases

Under an operating lease agreement, Genco is leasing certain CTs at a Joppa, Illinois site to its parent, Development Company for a minimum term of 15 years, expiring September 30, 2015. Under an electric power supply agreement with Marketing Company, Development Company supplies the capacity and energy from these leased units to Marketing Company, which in turn supplies the energy to Genco.

In September 1999, IP entered into an operating lease on four gas turbines located in Tilton, Illinois and a separate land lease at the Tilton site. IP sublet the turbines to its former affiliate, DMG, in October 1999. In July 2004, subsequent to the expiration of a statutory notice period after a filing at the ICC, IP terminated its lease with the original lessor. DMG then executed a transfer agreement under which the original lessor sold the turbine assets to DMG for the full contract price of $81 million. Additionally, IP assigned its associated land lease on the Tilton site to DMG. For IP, the Tilton lease was a complete pass-through, with no revenue or expense to IP, as DMG made all of the payments on IP's behalf. The receivable from DMG was offset by a corresponding payable to the lessor. For additional information relating to the Tilton capital lease and related asset retirement obligation liability and remeasurement, see Note 1 - Summary of Significant Accounting Policies.

The following tables present the impact of related party transactions on UE’s Consolidated Statement of Income for the years ended December 31, 2004, 2003 and 2002, and on the Consolidated Balance Sheet as of December 31, 2004 and 2003, based primarily on the agreements discussed above:


Statement of Income	2004		2003		2002
Operating revenues from affiliates:
Power supply agreement with EEI	$	7	$	6	$	9
Joint dispatch agreement with Genco		117		112		75
Agency agreement with Ameren Energy		214		202		165
Gas transportation agreement with Genco		1		1		1
Total operating revenues	$	339	$	321	$	250
Fuel and purchased power expenses from affiliates:
Power supply agreements:
EEI	$	68	$	58	$	51
Marketing Company		9		9		17
Joint dispatch agreement with Genco		46		40		40
Agency agreement with Ameren Energy		72		66		127
Total fuel and purchased power expenses	$	195	$	173	$	235
Other operating expenses:
Support service agreements:
Ameren Services	$	158	$	165	$	163
Ameren Energy		2		22		33
AFS		4		6		5
Total other operating expenses	$	164	$	193	$	201
Interest expense:
Borrowings (advances) related to money pool	$	3	$	2	$	1

143


Balance Sheet	2004		2003
Assets:
Miscellaneous accounts and notes receivable	$	9	$	16
Advances to money pool		1		12
Liabilities:
Accounts payable and wages payable	$	53	$	46
Borrowings from money pool		2		-

CIPS

The following tables present the impact of related party transactions on CIPS’ Statement of Income for the years ended December 31, 2004, 2003 and 2002, and on the Balance Sheet as of December 31, 2004, and 2003, based primarily on the agreements discussed above:


Statement of Income	2004		2003		2002
Operating revenues from affiliates:
Power supply agreements:
Marketing Company	$	34	$	29	$	25
CILCO		-		8		8
Total operating revenues	$	34	$	37	$	33
Fuel and purchased power expenses from affiliates:
Power supply agreements:
Marketing Company	$	291	$	312	$	393
EEI		34		29		25
Total fuel and purchased power expenses	$	325	$	341	$	418
Other operating expenses:
Support service agreements:
Ameren Services	$	48	$	54	$	61
AFS		1		1		1
Total other operating expenses	$	49	$	55	$	62
Interest (expense) income:
Note receivable from Genco	$	23	$	27	$	31
Borrowings (advances) related to money pool		-		-		(1	)


Balance Sheet	2004		2003
Assets:
Miscellaneous accounts and notes receivable	$	12	$	10
Promissory note receivable from Genco^(a)		249		373
Tax receivable from Genco^(b)		149		162
Liabilities:
Accounts payable and wages payable	$	49	$	43
Borrowings from money pool		68		121

(a)	Amount includes current portion of $249 million as of December 31, 2004 (December 31, 2003 - $49 million).

(b)	Amount includes current portion of $11 million as of December 31, 2004 (December 31, 2003 - $12 million).

Genco

The following tables present the impact of related party transactions on Genco’s Statement of Income for the years ended December 31, 2004, 2003 and 2002, and on the Balance Sheet as of December 31, 2004 and 2003, based primarily on the agreements discussed above:


Statement of Income	2004		2003		2002
Operating revenues from affiliates:
Power supply agreements:
Marketing Company	$	693	$	632	$	626
EEI		3		4		4
Joint dispatch agreement with UE		46		40		40
Agency agreement with Ameren Energy		113		96		56
Operating lease with Development Company		10		10		10
Total operating revenues	$	865	$	782	$	736
Fuel and purchased power expenses from affiliates:
Joint dispatch agreement with UE	$	117	$	112	$	75
Agency agreement with Ameren Energy		25		36		42
Power purchase agreement with Marketing Company		-		2		2
Gas transportation agreement with UE		1		1		1
Total fuel and purchased power expenses	$	143	$	151	$	120

144


Statement of Income	2004		2003		2002
Other operating expenses:
Support service agreements:
Ameren Services	$	18	$	18	$	19
Ameren Energy		2		11		16
AFS		2		2		2
Total other operating expenses	$	22	$	31	$	37
Interest expense:
Borrowings (advances) related to money pool	$	12	$	15	$	6
Note payable to CIPS		23		27		31
Note payable to Ameren		2		3		3


Balance Sheet	2004		2003
Assets:
Miscellaneous accounts and notes receivable	$	86	$	78
Liabilities:
Accounts payable and wages payable	$	13	$	22
Interest payable		5		7
Promissory note payable to CIPS^(a)		249		373
Promissory note payable to Ameren^(b)		34		38
Tax payable to CIPS^(c)		149		162
Borrowings from money pool		116		124

(a)	Amount includes current portion of $249 million as of December 31, 2004 (December 31, 2003 - $49 million).

(b)	Amount includes current portion of $34 million as of December 31, 2004 (December 31, 2003 - $4 million).

(c)	Amount includes current portion of $11 million as of December 31, 2004 (December 31, 2003 - $12 million).

CILCORP

The following tables present the impact of related party transactions on CILCORP’s Consolidated Statement of Income for the years ended December 31, 2004, 2003 and 2002, and on the Consolidated Balance Sheet as of December 31, 2004 and 2003, based primarily on the agreements discussed above:


Statement of Income^(a)(b)	2004		2003		2002
Operating revenues from affiliates:
Gas supply and services agreement with Medina Valley	$	-	$	12	$	14
Total operating revenues	$	-	$	12	$	14
Fuel and purchased power expenses from affiliates:
Executory tolling agreement with Medina Valley	$	30	$	26	$	25
Power purchase agreement with CIPS^(c)		-		8		8
Bilateral supply agreement with Marketing Company		-		1		-
Total fuel and purchased power expenses	$	30	$	35	$	33
Other operating expenses:
Support services agreements:
Ameren Services	$	54	$	15	$	-
AFS		2		2		-
Total other operating expenses	$	56	$	17	$	-
Interest expense:
Note payable to Ameren	$	5	$	1	$	-
Borrowings related to money pool		5		-		-

(a)	2002 amounts represent predecessor information. 2003 amounts include January 2003 predecessor information, which included $2 million in operating revenues and $3 million in purchased power associated with the executory tolling agreement with Medina Valley.

(b)	CILCORP consolidates CILCO and therefore includes CILCO amounts in its balances.

(c)	CIPS was not a related party of CILCORP prior to January 31, 2003.


Balance Sheet^(a)	2004		2003
Assets:
Miscellaneous accounts and notes receivable	$	9	$	8
Liabilities:
Accounts and wages payable	$	42	$	16
Note payable to Ameren		72		46
Borrowings from money pool		166		145

(a)	CILCORP consolidates CILCO and therefore includes CILCO amounts in its balances.

145

CILCO

The following tables present the impact of related party transactions on CILCO’s Consolidated Statement of Income for the years ended December 31, 2004, 2003 and 2002, and on the Consolidated Balance Sheet as of December 31, 2004, and 2003, based primarily on the various agreements discussed above:


Statement of Income	2004		2003		2002
Fuel and purchased power expenses from affiliates:
Executory tolling agreement with Medina Valley	$	30	$	26	$	25
Power purchase agreement with CIPS		-		8		8
Bilateral supply agreement with Marketing Company		-		1		-
Total fuel and purchased power expenses	$	30	$	35	$	33
Other operating expenses:
Support services agreements:
Ameren Services	$	52	$	15	$	-
AFS		2		2		-
Total other operating expenses	$	54	$	17	$	-
Interest expense:
Borrowings related to money pool	$	5	$	-	$	-


Balance Sheet	2004		2003
Assets:
Miscellaneous accounts and notes receivable	$	11	$	6
Liabilities:
Accounts and wages payable	$	42	$	23
Borrowings from money pool		169		149

The following tables present the impact of related party transactions on IP’s Consolidated Statement of Income for the years ended December 31, 2004, 2003 and 2002, and on the Consolidated Balance Sheet as of December 31, 2004 and 2003, based primarily on the various agreements discussed above:


Statement of Income	Three Months Ended December 31, 2004			Nine Months Ended September 30, 2004^(a)			2003^(a)			2002^(a)
Operating revenues from affiliates and former affiliates:
Retail electricity sales to DMG	$	-		$	1		$	3		$	3
Retail natural gas sales DMG		-			5			9			10
Transmission sales to DYPM		-			10			14			17
Interconnection transmission with DYPM		-			3			2			3
Interest income from former affiliates		-			128			170			170
Total operating revenues	$	-		$	147		$	198		$	203
Fuel and purchased power expenses from affiliates and former affiliates:
Power supply agreements:
DMG	$	-		$	346		$	472		$	486
EEI		3			-			-			-
Gas purchased from Dynegy		-			6			50			25
Total fuel and purchased power expenses	$	3		$	352		$	522		$	511
Other operating expenses:
Services and facilities agreement - Dynegy	$	-		$	11		$	16		$	25
Total other operating expenses	$	-		$	11		$	16		$	25
Interest expense (income):
Interest expense for IP SPT	$	4		$	17		$	-		$	-
Interest expense on Tilton lease		-			8			4			-
Interest income on Tilton lease		-			(8	)		(4	)		-
Advances to money pool		(1	)		-			-			-

(a)	Represents predecessor information.

146


Balance Sheet	2004		2003^(a)
Assets:
Accounts receivable	$	-	$	75
Miscellaneous accounts and notes receivable		4		-
Advances related to money pool		140		-
Investment in IP SPT		7		6
Notes receivable from former affiliate		-		2,271
Liabilities:
Accounts and wages payable	$	4	$	14
Long-term debt to IP SPT^(b)		351		419
Other deferred credits and other noncurrent liabilities		-		128

(a)	Represents predecessor information.

(b)	Amount includes current portion of $74 million as of December 31, 2004 (December 31, 2003 - $74 million) and includes a purchase accounting fair value adjustment of $18 million as of December 31, 2004.

NOTE 15 - COMMITMENTS AND CONTINGENCIES

As a result of issues generated in the course of daily business, we are involved in legal, tax and regulatory proceedings before various courts, regulatory commissions, and governmental agencies, some of which involve substantial amounts of money. We believe that the final disposition of these proceedings, except as otherwise disclosed in these notes to our financial statements, will not have an adverse material effect on our results of operations, financial position or liquidity.

Capital Expenditures

See Note 3 - Rate and Regulatory Matters for information regarding Ameren’s capital expenditure commitment with respect to IP, which was included in the ICC order approving Ameren’s acquisition of IP, as well as for information regarding Ameren’s and UE’s capital expenditure commitments, which were agreed upon in relation to UE’s 2002 Missouri electric rate case settlement and UE’s 2003 Missouri gas rate case settlement. Additionally, UE’s future estimated capital expenditures include the addition of new CTs with approximately 330 megawatts of capacity at its Venice, Illinois plant site by the end of 2005. Total costs expected to be incurred for these units are $125 million, of which $82 million was committed as of December 31, 2004.

Callaway Nuclear Plant

The following table presents insurance coverage at UE’s Callaway nuclear plant at December 31, 2004:


Type and Source of Coverage	Maximum Coverages	Maximum Assessments for Single Incidents
Public liability:
American Nuclear Insurers	$ 300	$ -
Pool participation	10,461	101^(a)
	$ 10,761^(b)	$ 101
Nuclear worker liability:
American Nuclear Insurers	$ 300^(c)	$ 4
Property damage:
Nuclear Electric Insurance Ltd.	$ 2,750^(d)	$ 21
Replacement power:
Nuclear Electric Insurance Ltd.	$ 490^(e)	$ 7

(a)

Retrospective premium under the Price-Anderson liability provisions of the Atomic Energy Act of 1954, as amended (Price-Anderson). This is subject to retrospective assessment with respect to loss from an incident at any U.S. reactor, payable at $10 million per year. Price-Anderson expired in August 2002 and the temporary extension expired December 31, 2003. Until Price-Anderson is renewed, its provisions continue to apply to existing nuclear plants.

(b)	Limit of liability for each incident under Price-Anderson.

(c)	Industry limit for potential liability from workers claiming exposure to the hazards of nuclear radiation.

(d)	Includes premature decommissioning costs.

(e)	Weekly indemnity of $4.5 million for 52 weeks, which commences after the first eight weeks of an outage, plus $3.6 million per week for 71.1 weeks thereafter.

Price-Anderson limits the liability for claims from an incident involving any licensed U.S. nuclear facility. The limit is based on the number of licensed reactors and is adjusted at least every five years to reflect changes in the Consumer Price Index. Utilities owning a nuclear reactor cover this exposure through a combination of private insurance and mandatory participation in a financial protection pool, as established by Price-Anderson.

If losses from a nuclear incident at the Callaway nuclear plant exceed the limits of, or are not subject to, insurance, or if coverage is not available, we self-insure the risk. Although we have no reason to anticipate a serious nuclear incident, if one did occur, it could have a material but indeterminable adverse effect on our results of operations, financial position, or liquidity.

147

Leases

The following table presents our lease obligations at December 31, 2004:


	Total		Less than 1 Year		1 - 3 Years		3 - 5 Years		After 5 Years
Ameren:^(a)
Capital leases^(b)	$	96	$	3	$	8	$	8	$	77
Operating leases^(c)		208		29		48		28		103
Total lease obligations	$	304	$	32	$	56	$	36	$	180
UE:
Capital leases^(b)	$	96	$	3	$	8	$	8	$	77
Operating leases^(c)		119		10		18		17		74
Total lease obligations	$	215	$	13	$	26	$	25	$	151
CIPS:
Operating leases^(c)	$	-	$	-	$	-	$	-	$	-
Genco:
Operating leases^(c)	$	38	$	2	$	5	$	4	$	27
CILCORP:
Operating leases^(c)	$	3	$	1	$	2	$	-	$	-
CILCO:
Operating leases^(c)	$	3	$	1	$	2	$	-	$	-
IP:
Operating leases	$	28	$	7	$	13	$	5	$	3

(a)	Includes amounts for Ameren Registrant and non-Registrant subsidiaries and intercompany eliminations.

(b)	See Note 6 - Long-term Debt and Equity Financings for further discussion.

(c)

Amounts related to certain real estate leases and railroad licenses have indefinite payment periods. The amounts for these items are included in the Less than 1 Year, 1 - 3 Years and 3 - 5 Years columns. Amounts for After 5 Years are not included in the total amount due to the indefinite periods. Ameren’s estimated obligation for after five years is $1 million annually for both the real estate leases and the railroad licenses.

We lease various facilities, office equipment, plant equipment, and rail cars under operating leases. We also have a capital lease relating to UE’s Peno Creek CT facility. We also had a capital lease relating to nuclear fuel for UE’s Callaway nuclear plant, which was terminated early in February 2004. See Note 6 - - Long-term Debt and Equity Financings for further information on this nuclear fuel lease. In September 1999, IP entered into an operating lease on four gas turbines located in Tilton, Illinois and a separate land lease at the Tilton site. IP sublet the turbines to a predecessor of DMG in October 1999. In July 2004, subsequent to the expiration of a statutory notice period after a filing at the ICC, IP terminated the lease with the original lessor. DMG then executed a transfer agreement under which the original lessor sold the turbine assets to DMG for the full contract price of $81 million. Additionally, IP assigned its associated land lease on the Tilton site to DMG. The following table presents total rental expense, included in Other Operations and Maintenance expenses, as of December 31, 2004, 2003 and 2002:


	2004		2003		2002
Ameren^(a)	$	21	$	61	$	21
UE		25		59		24
CIPS		8		9		10
Genco		2		2		2
CILCORP^(b)		5		5		5
CILCO		5		5		5
IP^(c)		5		6		7

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004; excludes amounts for CILCORP and CILCO prior to the acquisition date of January 31, 2003; and includes amounts for Ameren Registrant and non-Registrant subsidiaries and intercompany eliminations.

(b)	2002 amounts represent predecessor information. January 2003 predecessor amount was less than $1 million.

(c)	2003 and 2002 amounts represent predecessor information. January through September 2004 predecessor amount was $4 million.

148

Other Obligations

To supply a portion of the fuel requirements of our generating plants, we have entered into various long-term commitments for the procurement of coal, natural gas, and nuclear fuel. In addition, we have entered into various long-term commitments for the purchase of electricity and natural gas for distribution. The following table presents the total estimated fuel, power purchase, and natural gas commitments at December 31, 2004:


	Coal		Gas		Nuclear		Electric Capacity^(c)		Total
Ameren:^(a)
2005	$	702	$	478	$	11	$	167	$	1,358
2006		671		249		9		167		1,096
2007		535		100		1		23		659
2008		409		43		10		23		485
2009		223		13		9		1		246
Thereafter^(b)		36		16		-		-		52
Total	$	2,576	$	899	$	40	$	381	$	3,896
UE:
2005	$	361	$	77	$	11	$	49	$	498
2006		335		40		9		22		406
2007		264		15		1		22		302
2008		189		5		10		22		226
2009		83		2		9		-		94
Thereafter^(b)		18		2		-		-		20
Total	$	1,250	$	141	$	40	$	115	$	1,546
CIPS:
2005	$	-	$	81	$	-	$	122	$	203
2006		-		55		-		122		177
2007		-		22		-		-		22
2008		-		3		-		-		3
2009		-		-		-		-		-
Thereafter^(b)		-		-		-		-		-
Total	$	-	$	161	$	-	$	244	$	405
Genco:
2005	$	191	$	18	$	-	$	-	$	209
2006		175		14		-		-		189
2007		165		5		-		-		170
2008		143		3		-		-		146
2009		105		2		-		-		107
Thereafter^(b)		10		3		-		-		13
Total	$	789	$	45	$	-	$	-	$	834
CILCORP:^(d)
2005	$	71	$	156	$	-	$	5	$	232
2006		82		95		-		5		182
2007		44		51		-		5		100
2008		32		26		-		5		63
2009		14		5		-		5		24
Thereafter^(b)		3		-		-		-		3
Total	$	246	$	333	$	-	$	25	$	604
CILCO:
2005	$	71	$	156	$	-	$	5	$	232
2006		82		95		-		5		182
2007		44		51		-		5		100
2008		32		26		-		5		63
2009		14		5		-		5		24
Thereafter^(b)		3		-		-		-		3
Total	$	246	$	333	$	-	$	25	$	604
IP:
2005	$	-	$	126	$	-	$	155	$	281
2006		-		40		-		144		184
2007		-		6		-		-		6
2008		-		4		-		-		4
2009		-		4		-		-		4
Thereafter^(b)		-		11		-		-		11
Total	$	-	$	191	$	-	$	299	$	490

(a)	Includes amounts for Ameren Registrant and non-Registrant subsidiaries and intercompany eliminations.

(b)	Commitments for coal, natural gas, nuclear fuel and the purchase of electricity are until 2010, 2012, 2009 and 2009, respectively.

(c)	Beginning in 2007, CIPS, CILCO and IP are expected to purchase all electric capacity and energy through a competitive procurement process approved by the ICC.

(d)	CILCORP consolidates CILCO and therefore includes CILCO in its amounts.

149

IP paid the $5 million in remaining decommissioning obligations associated with its former Clinton nuclear plant in December 2004. Other obligations also include decontamination and decommissioning charges associated with IP’s use of a DOE facility that enriched uranium for the Clinton nuclear plant. IP was assessed an amount to be paid over 15 years that would be used by the DOE for decontamination and decommissioning of its facility. The remaining obligation is $2 million and the final payment is due in 2006.

Environmental Matters

We are subject to various environmental regulations by federal, state and local authorities. From the beginning phases of siting and development to the ongoing operation of existing or new electric generating, transmission and distribution facilities, and natural gas storage plant, transmission and distribution facilities, our activities involve compliance with diverse laws and regulations. These address noise, emissions, and impacts to air and water, protected and cultural resources (such as wetlands, endangered species, and archeological/historical resources), chemical and waste handling. Our activities often require complex and often lengthy processes as we obtain approvals, permits or licenses for new, existing or modified facilities. Additionally, the use and handling of various chemicals or hazardous materials (including wastes) requires preparation of release prevention plans and emergency response procedures. As new laws or regulations are promulgated, we assess their applicability and implement the necessary modifications to our facilities or their operations, as required. The more significant matters are discussed below.

Clean Air Act

The EPA issued a rule in October 1998 that required 22 eastern states and the District of Columbia to reduce emissions of NO_x in order to reduce ozone in the eastern United States. Among other things, the EPA’s rule establishes an ozone season, which runs from May through September, and a NO_x emission budget for each state, including Illinois. The EPA rule required states to implement controls sufficient to meet their NO_x budget by May 31, 2004. In the spring of 2004, the EPA issued similar rules for Missouri. The compliance date for the Missouri rules is May 1, 2007.

As a result of these requirements, affected Ameren Companies have installed a variety of NO_x control technologies on power plant boilers over the past several years. Ameren’s and UE’s future estimated capital expenditures to comply with the final NO_x regulations in Missouri between 2005 and 2008 are $15 million to $20 million.

In mid-December 2003, the EPA issued proposed regulations with respect to SO₂ and NO_x emissions (the Clean Air Interstate Rule) and mercury emissions from coal-fired power plants. The new rules, if adopted, will require significant additional reductions in these emissions from UE, Genco and CILCO power plants in phases, beginning in 2010. The rules are currently under a public review and comment period; they may change before being issued as final. We do not expect regulations to be finalized until the first half of 2005. The following table presents preliminary estimated capital costs based on current available technology to comply with theClean Air Interstate Rule and mercuryrules, as proposed:


	2005	2006 - 2009	2010 - 2015	Total
Ameren	$ 50	$ 510 - $ 1,360	$ 355 - $ 1,130	$ 1,400 - $ 1,900
UE	20	160 - 880	175 - 880	840 - 1,140
Genco	10	250 - 340	140 - 200	400 - 550
CILCO	20	100 - 140	40 - 50	160 - 210

IP and DMG are the subject of a Notice of Violation (NOV) from the EPA and a complaint filed in 1999 by the United States in the U.S. District Court for the Southern District of Illinois (Court) alleging violations of the Clean Air Act and certain related federal and Illinois regulations. Similar notices and complaints were filed against other owners of coal-fired power plants in what we refer to as the Utility Enforcement Initiative. Both the NOV and the complaint allege that certain equipment repairs, replacements, and maintenance activities at the three Baldwin Power Station generating units, currently owned by DMG and formerly owned by IP, constituted “major modifications” under the Prevention of Significant Deterioration (PSD) regulations, the New Source Performance Standard (NSPS) regulations and the applicable Illinois regulations. It is further alleged that the defendants failed to obtain required operating permits under the applicable Illinois regulations. When activities meeting the definition of “major modifications” occur, the Clean Air Act and related regulations generally subject those activities to PSD review and permit requirements; the generating facilities where the activities occur must meet more stringent emissions standards, which may entail the installation of potentially costly pollution control equipment.

Pursuant to the terms of the stock purchase agreement covering Ameren’s acquisition of IP from Dynegy, Dynegy agreed to fully indemnify Ameren and IP in the event of an adverse ruling and in any settlement arising from or out of this litigation. To secure payment of the indemnification obligations

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of Dynegy, Ameren, pursuant to the terms of the stock purchase agreement, has deposited $100 million of the cash portion of the purchase price into an escrow account with the funds to be released to Dynegy on the sooner of (1) December 31, 2010; (2) the date on which the senior unsecured debt of Dynegy Holdings Inc., a Dynegy subsidiary, achieves an investment grade rating from S&P or Moody’s; or (3) the occurrence of specified events relating to contingent environmental liabilities associated with IP’s former generating facilities, including the Baldwin Power Station.

DMG has entered into a comprehensive settlement with the EPA, the U.S. and other intervening parties that resolves this litigation. The settlement agreement is set forth in a consent decree and resolves all claims in the litigation as well as similar claims that may have been brought with respect to other generation facilities owned by DMG and formerly owed by IP. If approved by the Court, this consent decree will relieve IP of any civil liability under the Clear Air Act and related federal and Illinois regulations with respect to IP's former ownership of the Baldwin Power Station and other generation assets now owned by DMG. The consent decree, upon its approval by the Court, is also expected to satisfy the conditions for the release to Dynegy of the $100 million of the IP purchase price that is held in an escrow account as discussed above.

Multipollutant Legislation

The United States Congress has been working on legislation to consolidate the numerous air pollution regulations facing the utility industry. Continued deliberation on this “Clear Skies” legislation is expected in 2005. Our cost to comply with such legislation, if it is enacted, is expected to be covered by the modifications to our facilities required by combined mercury and Clean Air Interstate rules described above.

Global Climate

Future initiatives regarding greenhouse gas emissions and global warming are the subjects of much debate. As a result of our diverse fuel portfolio, our contribution to greenhouse gases varies. Coal-fired power plants, however, are significant sources of carbon dioxide emissions, a principal greenhouse gas. The related Kyoto Protocol was signed by the United States but has since been rejected by the president, who instead has asked for an 18% decrease in carbon intensity on a voluntary basis. In response to the administration’s request, six electric power sector trade associations, including the Edison Electric Institute, of which Ameren is a member, and the Tennessee Valley Authority signed a Memorandum of Understanding (MOU) with the DOE in December 2004 calling for a 3% - 5% decrease in carbon intensity from the utility sector between 2002 and 2012 on a voluntary basis. Currently, Ameren is considering various initiatives to comply with the MOU, including enhanced generation at our nuclear and hydro power plants, increased efficiency measures at our coal-fired units, and investments in renewable energy and carbon sequestration projects.

Ameren has already taken actions to address the global climate issue. These include implementing efficiency improvements at our power plants; participating in the PowerTree Carbon Company, LLC, whose purpose is to reforest acreage in the lower Mississippi valley to sequester carbon; using coal combustion by-products as a direct replacement for cement, thereby reducing carbon emissions at cement kilns; participating in "Missouri Schools Going Solar," a project that will install photovoltaic solar arrays on school grounds; and partnering with other utilities, the Electric Power Research Institute, and the Illinois Geological Survey in the DOE Illinois Basin Initiative, which will examine methods and the feasibility of storing carbon dioxide within deep, uneconomic coal seams, mature oil fields, and saline reservoirs.

Future initiatives related to greenhouse gas emissions and global warming and the ultimate effects of the Kyoto Protocol on us are unknown. Although compliance costs are unlikely in the near future, our costs of complying with any mandated federal greenhouse gas program could have a material impact on our future results of operations, financial position, or liquidity.

Clean Water Act

In July 2004, the EPA issued rules under the Clean Water Act that require that cooling water intake structures reflect the best technology available for minimizing adverse environmental impacts. These rules pertain to existing generating facilities that currently employ a cooling water intake structure whose flow exceeds 50 million gallons per day. The rules may require us to install additional intake screens or other protective measures, and to do extensive site-specific study and monitoring. There is also the possibility that the rules may lead to the installation of cooling towers on some of our facilities. Our compliance costs associated with conducting field studies and installing fish collection systems to determine the aquatic impact of our intake structures will be in the range of a few million dollars over the next few years. These studies will determine what, if any, additional technology must be applied at nine of our existing power plants. At this time, we are unable to estimate the costs of complying with these rules. Such costs will not be incurred prior to 2008.

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Remediation

We are involved in a number of remediation actions to clean up hazardous waste sites as required by federal and state law. Such statutes require that responsible parties fund remediation actions regardless of fault, legality of original disposal, or ownership of a disposal site. UE, CIPS, CILCO and IP have each been identified by the federal or state governments as a potentially responsible party at several contaminated sites. Several of these sites involve facilities that were transferred by CIPS to Genco in May 2000 and were transferred by CILCO to AERG in October 2003. As part of each transfer, the transferor (CIPS or CILCO) has contractually agreed to indemnify the transferee (Genco or AERG) for remediation costs associated with preexisting environmental contamination at the transferred sites.

UE, CIPS, CILCO, and IP own or are otherwise responsible for one, 13, four, and 25 former MGP sites, respectively, in Illinois. All of these sites are in various stages of investigation, evaluation and remediation. Under its current schedule, Ameren anticipates that remediation at these sites should be completed by 2015. The ICC permits each company to recover remediation and litigation costs associated with their former MGP sites located in Illinois from their Illinois electric and natural gas utility customers through environmental adjustment rate riders. To be recoverable, such costs must be prudently and properly incurred; costs are subject to annual reconciliation review by the ICC. The total costs deferred, net of recoveries from insurers and through environmental adjustment rate riders, at December 31, 2004, were $1 million, $25 million, $4 million, and $64 million for UE, CIPS, CILCO, and IP, respectively.

In addition, UE owns or is otherwise responsible for 10 MGP sites in Missouri and one in Iowa. Unlike Illinois, UE does not have in effect in Missouri a rate rider mechanism which permits remediation costs associated with MGP sites to be recovered from utility customers. UE does not have any retail utility operations in Iowa. Because of the unknown and unique characteristics of each site (such as amount and type of residues present, physical characteristics of the site and the environmental risk), and uncertain regulatory requirements, we are not able to determine the maximum liability for the remediation of these sites. UE has recorded a $16 million liability as of December 31, 2004, to represent its estimated minimum obligation. At this time, we are unable to determine what portion of these costs, if any, will be eligible for recovery from insurance carriers.

In June 2000, the EPA notified UE and numerous other companies that former landfills and lagoons in Sauget, Illinois, may contain soil and groundwater contamination. These sites are known as Sauget Area 1 and Sauget Area 2. From approximately 1926 until 1976, UE operated a power generating facility adjacent to Sauget Area 2; UE currently owns and operates electric transmission and distribution facilities in or near Sauget Areas 1 and 2.

In September 2000, the DOJ was granted leave by the U.S. District Court of the Southern District of Illinois to add numerous additional parties, including UE, to a pre-existing lawsuit between the government and others. The government seeks recovery of response costs under CERCLA (Superfund), incurred in connection with the remediation of Sauget Area 1. In October 2003, the government dismissed UE as a party to the lawsuit. UE considers the Sauget Area 1 litigation closed.

In September 2001, the EPA proposed in the Federal Register that Sauget Area 1 and Sauget Area 2 be listed on the National Priorities List. The inclusion of a site on this list allows the EPA to access Superfund trust monies to fund site remediations. With respect to Sauget Area 2 and under the terms of an Administrative Order and Consent, UE has joined with other potentially responsible parties to evaluate the extent of potential contamination. We are unable to predict the ultimate impact of the Sauget Area 2 site on our results of operations, financial position, or liquidity.

In October 2002, UE was included in a Unilateral Administrative Order list of potentially liable parties for groundwater contamination for a portion of the Sauget Area 2 site. The Unilateral Administrative Order encompasses the groundwater contamination releasing to the Mississippi River adjacent to Monsanto Chemical Company’s (now known as Solutia) former chemical waste landfill and the resulting impact area in the Mississippi River. UE is being asked to participate in response activities that involve the installation of a barrier wall around a chemical waste site with three recovery wells to divert groundwater flow. The projected cost for this remedy method is $26 million. In November 2002, UE sent a letter to the EPA asserting its defenses to the Unilateral Administrative Order and requested its removal from the list of potentially responsible parties under the Unilateral Administrative Order. Solutia agreed to comply with the Unilateral Administrative Order. However, in December 2003, Solutia filed for bankruptcy protection; it is now seeking to discharge its environmental liabilities. In March 2004, Pharmacia Corporation, the former parent company of Solutia, confirmed its intent to comply with the EPA’s Unilateral Administrative Order. As the status of future remediation at Sauget Area 2 or compliance with the Unilateral Administrative Order is uncertain, we are unable to predict the ultimate impact of the Sauget Area 2 site on our results of operations, financial position, or liquidity. In December 2004, the U.S. Supreme Court in the case Cooper Industries, Inc. vs. Availl Services Inc. limited the circumstances under which potentially responsible parties could assert cost-recovery claims against other potentially responsible parties. As a result of this ruling, UE may not be able to recover from other potentially responsible parties the costs it incurs in complying with EPA orders.

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In October 2002, CILCO submitted a corrective action plan to the Illinois Environmental Protection Agency (Illinois EPA) in accordance with permit conditions to address groundwater issues associated with the recycle pond and ash ponds at the Duck Creek power plant facility. In January 2003, the Illinois EPA accepted portions of the plan but rejected other portions. Additional discussions with the Illinois EPA will be necessary to develop an acceptable plan. CILCORP and CILCO both have a liability of $5 million at December 31, 2004, included on their Consolidated Balance Sheets for the estimated cost of the remediation effort to treat and discharge the recycle system water in order to address these groundwater issues. Future CILCO capital expenditures at Duck Creek will include construction of a dry fly ash collection system, a landfill, and a new pond. CILCO estimates that future capital expenditures for the indicated activities could be approximately $15 million by 2008.

In addition, our operations or those of our predecessor companies, involve the use, disposal and, in appropriate circumstances, the cleanup of substances regulated under environmental protection laws. We are unable to determine the impact these actions may have on our results of operations, financial position, or liquidity.

Waste Disposal

On July 30, 2002, the Illinois Attorney General’s Office advised us that it would be commencing an enforcement action concerning an inactive waste disposal site near Coffeen, Illinois. This is the location of a disposal facility that is permitted by the Illinois EPA to receive fly ash from Genco’s Coffeen power plant. The Illinois Attorney General also notified the disposal facility’s current and former owners about the proposed enforcement action. The Attorney General’s Office advised us that it may initiate an action under CERCLA (Superfund) to recover past costs incurred at the site ($0.3 million) and to obtain a declaratory judgment as to liability for future costs. Neither Genco, the current owner of the Coffeen power plant, nor CIPS, the prior owner of the Coffeen power plant, owned or operated the disposal facility. We do not expect that this matter will have a material adverse effect on Ameren’s, CIPS' or Genco’s results of operations, financial position, or liquidity.

Emission Credits

Both federal and state laws require significant reductions in SO₂ and NO_x emissions from burning fossil fuels. The Clean Air Act and NO_x Budget Trading Program created marketable commodities called allowances. Each allowance gives the owner the right to emit one ton of SO₂ or NO_x. All existing generating facilities have been allocated allowances that are based on past production and the statutory emission reduction goals. UE, Genco, CILCO and EEI have recorded these allowances at no cost. If additional allowances are needed for new generating facilities, they can be purchased from facilities having excess allowances or from allowance banks. Our generating facilities comply with the SO₂ limits through the use and purchase of allowances, the use of low-sulfur fuels, or the application of pollution control technology. The NO_x Budget Trading Program limits emissions of NO_x during the ozone season (May through September). The NO_x Budget Trading Program applies to all electric generating units in Illinois beginning in 2004 and in the eastern third of Missouri, where UE’s coal-fired power plants are located, beginning in 2007. Our generating facilities are expected to comply with the NO_x limits through the use and purchase of allowances or through the application of pollution control technology, including low NO_x burners, over-fire air systems, combustion optimization, and selective catalytic reduction systems.

As of December 31 2004, UE, Genco, CILCO, and EEI held 1.6 million, 0.4 million, 0.2 million, and 0.3 million tons, respectively, of SO₂ emission allowances with vintages from 2004 to 2012. Each company possesses additional allowances for use in periods beyond 2012. As of December 31, 2004, UE, Genco, CILCO and EEI Illinois facilities held 290, 22,400, 6,300 and 8,600 tons, respectively, of NO_X emission allowances with vintages from 2004 to 2007. The Illinois EPA is still determining some NO_x emission allowance allocations for this period and 2008. UE, Genco, CILCO and EEI expect to use a substantial portion of the SO₂ and NO_x allowances for ongoing operations. Allocations of NO_x allowances for Missouri facilities are pending the finalization of rules by Missouri regulators. New environmental regulations, including the Clean Air Interstate Rule, the timing of the installation of pollution control equipment, and level of operations will have a significant impact on the amount of allowances actually required for ongoing operations.

Asbestos-Related Litigation

Ameren, UE, CIPS, Genco, CILCO and IP have been named, along with numerous other parties, in a number of lawsuits that have been filed by certain plaintiffs claiming varying degrees of injury from asbestos exposure. Most have been filed in the Circuit Court of Madison County, Illinois. The number of total defendants named in each case is significant; as many as 235 parties are named in some cases and as few as five in others. However, the average number of parties is 61 in the cases that were pending as of December 31, 2004.

The claims filed against Ameren, UE, CIPS, Genco, CILCO and IP allege injury from asbestos exposure during the plaintiffs’ activities at our present or former electric generating plants. Former CIPS plants are now owned by Genco, and most former CILCO plants are now owned by AERG. Most of IP’s plants were transferred to a Dynegy subsidiary prior to Ameren’s acquisition of IP. As a part of the transfer of ownership of the CIPS and CILCO generating plants, the transferor (CIPS or CILCO) has contractually agreed to

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indemnify the transferee (Genco or AERG) for liabilities associated with asbestos-related claims arising from activities prior to the transfer. Each lawsuit seeks unspecified damages in excess of $50,000, which, if proved, typically would be shared among the named defendants.

From September 30, 2004, through December 31, 2004, 24 additional asbestos-related lawsuits were filed against UE, CIPS, CILCO and IP, mostly in the Circuit Court of Madison County, Illinois; three lawsuits were dismissed and one was settled. The following table presents the status as of December 31, 2004, of the asbestos-related lawsuits that have been filed against the Ameren Companies:


		Specifically Named as Defendant
	Total^(a)	Ameren	UE	CIPS	Genco	CILCO	IP
Filed	266	22	145	99	2	19	114
Settled	57	-	35	20	-	2	26
Dismissed	100	9	60	29	-	3	45
Pending	109	13	50	50	2	14	43

(a)	Addition of the numbers in the individual columns does not equal the total column because some of the lawsuits name multiple Ameren entities as defendants.

In January 2005, UE filed suit in the Circuit Court of Madison County, Illinois, alleging that four of its historic liability insurers have failed to pay more than $2 million in fees and costs relating to the defense and investigation of more than 120 asbestos lawsuits filed against UE. The defendant insurers are American Automobile Insurance Co., Pacific Insurance Co., Royal Insurance Co. of America and Royal Indemnity Co. These insurers insured UE from the late 1940s through the early 1970s for liability arising out of the work of independent contractors working at UE’s facilities. We are unable to predict the outcome of this lawsuit.

As of December 31, 2004, five asbestos-related lawsuits were pending against EEI. The general liability insurance maintained by EEI provides coverage with respect to liabilities arising from asbestos-related claims.

The Ameren Companies believe that the final disposition of these proceedings will not have a material adverse effect on their results of operations, financial position, or liquidity. See Note 3 - Rate and Regulatory Matters - IP and EEI Acquisition for information on the ICC’s approval of a tariff rider through which asbestos-related litigation claims will be allowed to be recovered from IP’s electric customers, subject to certain terms, commencing in 2007.

Other Matters

Enron Litigation Settlement

In May 2001, CILCO and Enron Power Marketing, Inc. (EPMI), a subsidiary of Enron Corporation (Enron), entered into a master agreement for electric purchases and sales, which covered energy transactions scheduled for deliveries during the period of 2001 to 2003. In November 2001, EPMI demanded that CILCO post $28 million in collateral based on mark-to-market exposure of open transactions. Also in November 2001, CILCO notified EPMI that events of default had occurred under the master agreement. Therefore, pursuant to the termination provisions of the master agreement it declared the master agreement terminated effective December 20, 2001. Enron and EPMI filed Chapter 11 bankruptcy petitions in December 2001 in the U.S. Bankruptcy Court for the Southern District of New York. In December 2002, EPMI filed a complaint against AES, Constellation New Energy, Inc., formerly known as AES New Energy Inc., and CILCO in the U.S. Bankruptcy Court seeking $31 million. As a result of court-ordered mediation of this matter, a settlement agreement was reached among the parties and approved by the Bankruptcy Court on September 30, 2004. This settlement agreement and court order settled the outstanding claims by requiring CILCO to pay $20.9 million to an Enron subsidiary. This settlement payment was made during October 2004. The payment also settled an unrelated dispute between CILCO and another Enron subsidiary, Enron North America Corporation (ENA), over ENA’s failure to deliver natural gas to CILCO pursuant to transactions entered into in May and October 2001. AES, in conjunction with its sale of CILCORP to Ameren in 2003, agreed to indemnify Ameren against the after-tax cost of all liabilities, which includes the settlement payment, legal fees, and expenses incurred by CILCO relating to the Enron claim. Ameren assigned its indemnification rights to CILCO. The indemnification payment from AES to CILCO also took place in October 2004. As a result of the income tax treatment afforded the settlement and related indemnification, this settlement had no earnings impact on Ameren, CILCORP or CILCO.

Retiree Medical Plan Litigation

In June 2003, 20 retirees and surviving spouses of retirees of various Ameren companies (the plaintiffs) filed a complaint in the U.S. District Court, Southern District of Illinois, against Ameren, UE, CIPS, Genco and Ameren Services, and against our Retiree Medical Plan and by an amended complaint, our Group Medical Plan (the defendants). The retirees were members of various local labor unions of the IBEW and the IUOE. The complaint, referred to as Barnett et al. vs. Ameren Corporation, et al., alleged, among other things, that the defendants recent actions relating to requiring retirees to pay a portion of their own health care premiums or

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increasing the premiums paid by dependents or surviving spouses of retirees violate the ERISA and Labor Management Relations Act of 1947 and constitute a breach of the defendants’ fiduciary duties.

In July 2004, the District Court denied the plaintiffs’ motion to certify this lawsuit as a class action and in September 2004, the U.S. Seventh Circuit Court of Appeals denied the plaintiffs’ application to appeal the District Court’s decision. In January 2005, the District Court granted the defendants’ motion for summary judgment, which dismisses the plaintiffs’ complaint against the defendants with prejudice. In February 2005, the plaintiffs filed a notice of appeal of the District Court’s ruling with the U.S. Seventh Circuit Court of Appeals. We do not believe the final resolution of this matter will have a material adverse effect on our results of operations, financial position, or liquidity.

IP Litigation

Kemerer vs. IP was brought against IP in the Circuit Court of Mercer County, Illinois, by the wife of a man who died in 2000 when he backed his aluminum ladder into overhead power lines and was electrocuted. In the lawsuit, the plaintiff sought to recover on allegations of wrongful death (including lost wages and pain and suffering), negligent infliction of emotional distress (to the decedent’s wife), and punitive damages. The case was tried before a jury in January 2004, and the jury awarded the plaintiff $1.6 million in actual damages and $3 million in punitive damages. In January 2005, IP entered into a settlement agreement with the plaintiff resolving all outstanding matters; the terms of the settlement are confidential. This settlement will not have a material adverse effect upon IP’s results of operations, financial position, or liquidity.

Another case involved plaintiffs Lucash and Johnson, who were killed in an automobile accident in February 2001 when their car struck an IP guy wire and utility pole and caught fire. The plaintiffs’ families filed lawsuits against IP in the Circuit Court of Madison County, Illinois, which asserted wrongful death and survivorship causes of action alleging that IP failed to properly maintain its electrical equipment and did not have authority for the location of the pole. The lawsuit sought unspecified damages in excess of $50,000. In February 2005, IP entered into settlement agreements with the plaintiffs that resolved all outstanding matters; the terms of those settlements are confidential. Those settlements will not have a material adverse effect upon IP’s results of operation, financial position, or liquidity.

Leveraged Leases

Ameren owns interests in assets that have been financed as leveraged leases. One of these leveraged leases is a $10 million investment at December 31, 2004, in an aircraft leased to Delta Air Lines. Delta Air Lines reported significant operating losses and disclosed in its Form 10-Q filing for the three months ended September 30, 2004, that these results are unsustainable and underscore the urgent need to reduce its cost structure. Ameren could lose all or a portion of its investment in the Delta Air Lines lease in the event of a bankruptcy or default by Delta Air Lines or any voluntary restructuring of the lease. As of December 31, 2004, Delta Air Lines was current on its payments on this lease.

Regulation

Regulatory changes enacted and being considered at the federal and state levels continue to change the structure of the utility industry and utility regulation, as well as to encourage increased competition. At this time, we are unable to predict the impact of these changes on our future results of operations, financial position, or liquidity. See Note 3 - Rate and Regulatory Matters for further information.

NOTE 16 - CALLAWAY NUCLEAR PLANT

Under the Nuclear Waste Policy Act of 1982, the DOE is responsible for the permanent storage and disposal of spent nuclear fuel. The DOE currently charges one mill, or ¹/₁₀ of one cent, per nuclear-generated kilowatthour sold for future disposal of spent fuel. Pursuant to this act, UE collects one mill from its electric customers for each kilowatthour of electricity that it generates from its Callaway nuclear plant. Electric utility rates charged to customers provide for recovery of such costs. The DOE is not expected to have its permanent storage facility for spent fuel available until at least 2010. UE has sufficient storage capacity at its Callaway nuclear plant until 2020. It has the capability for additional storage capacity through the licensed life of the plant. The delayed availability of the DOE’s disposal facility is not expected to adversely affect the continued operation of the Callaway nuclear plant through its currently licensed life.

Electric utility rates charged to customers provide for the recovery of the Callaway nuclear plant’s decommissioning costs, which include decontamination, dismantling, and site restoration costs, over an assumed 40-year life of the plant, ending with the expiration of the plant’s operating license in 2024. The Callaway nuclear plant site is assumed to be decommissioned based on immediate dismantlement method and removal from service. Ameren and UE have recorded an asset retirement obligation for the Callaway nuclear plant decommissioning costs at fair value, which represents the present value of estimated future cash outflows. See the discussion of SFAS No.143, “Accounting for Asset Retirement Obligations” in Note 1 - Summary of Significant Accounting Policies. Decommissioning costs are charged to cost of services used to establish electric rates for UE’s customers. These costs amounted to $7 million in each of the years 2004, 2003 and 2002. Every three years, the MoPSC and ICC

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require UE to file updated cost studies for decommissioning its Callaway nuclear plant. Electric rates may be adjusted at such times to reflect changed estimates. The latest studies were filed in 2002; updated cost studies are expected to be filed in September 2005. Costs collected from customers are deposited in an external trust fund to provide for the Callaway nuclear plant’s decommissioning. If the assumed return on trust assets is not earned, we believe that it is probable that any such earnings deficiency will be recovered in rates. The fair value of the nuclear decommissioning trust fund for UE’s Callaway nuclear plant is reported in Nuclear Decommissioning Trust Fund in Ameren’s and UE’s Consolidated Balance Sheets. This amount is legally restricted. It may be used only to fund the costs of nuclear decommissioning. Changes in the fair value of the trust fund are recorded as an increase or decrease to the nuclear decommissioning trust fund and to the regulatory asset recorded in connection with the adoption of SFAS No. 143. Upon the completion of UE’s transfer of its Illinois electric and gas utility businesses to CIPS, which is subject to the receipt of regulatory approvals, the assets and liabilities related to the Illinois portion of the decommissioning trust fund will be transferred to Missouri. See Note 3 - Rate and Regulatory Matters for further information.

NOTE 17 - FAIR VALUE OF FINANCIAL INSTRUMENTS

The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate that value:

Cash, Temporary Investments and Short-term Borrowings

The carrying amounts approximate fair value because of the short-term maturity of these instruments.

Marketable Securities

The fair value is based on quoted market prices obtained from dealers or investment managers.

Nuclear Decommissioning Trust Fund

The fair-value estimate is based on quoted market prices for securities.

Preferred Stock of UE, CIPS, CILCO and IP

The fair-value estimate is based on the quoted market prices for the same or similar issues.

Long-term Debt

The fair-value estimate is based on the quoted market prices for same or similar issues or on the current rates offered to the Ameren Companies for debt of comparable maturities.

Derivative Financial Instruments

Market prices used to determine fair value are primarily based on published indices and closing exchange prices. In addition, valuations must also rely on management’s estimates, which take into account time value of money and volatility factors.

The following table presents the carrying amounts and estimated fair values of our financial instruments at December 31, 2004 and 2003:


	2004				2003
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Ameren:^(a)
Long-term debt and capital lease obligations (including current portion)	$	5,444	$	5,747	$	4,568	$	4,903
Preferred stock		215		176		203		186
UE:
Long-term debt and capital lease obligations (including current portion)	$	2,062	$	2,107	$	2,102	$	2,117
Preferred stock		113		95		113		110
CIPS:
Long-term debt (including current portion)	$	450	$	483	$	485	$	539
Preferred stock		50		34		50		39
Genco:
Long-term debt (including current portion)	$	698	$	836	$	698	$	832
CILCORP:^(b)
Long-term debt (including current portion)	$	639	$	708	$	769	$	827
Preferred stock		39		36		40		37
CILCO:
Long-term debt (including current portion)	$	138	$	143	$	238	$	256
Preferred stock		39		36		40		37
IP:^(c)
Long-term debt (including current portion)	$	1,134	$	1,138	$	1,925	$	2,105
Preferred stock		46		37		46		44

(a)	Excludes amounts for IP for 2003; and includes amounts for Ameren Registrant and non-Registrant subsidiaries and intercompany eliminations.

(b)	CILCORP consolidates CILCO and therefore includes CILCO amounts in its balances.

(c)	2003 amounts represent predecessor information.

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UE has investments in debt and equity securities that are held in trust funds for the purpose of funding the nuclear decommissioning of its Callaway nuclear plant. See Note 16 - Callaway Nuclear Plant for further information. We have classified these investments in debt and equity securities as available for sale and have recorded all such investments at their fair market value at December 31, 2004 and 2003. Investments by the nuclear decommissioning trust fund are allocated 60% to 70% to equity securities, with the balance invested in fixed-income securities. Fixed-income investments are limited to U.S. government or agency securities, municipal bonds, or investment-grade corporate securities. The proceeds from the sale of investments were $131 million in 2004 (2003 - $123 million; 2002 - $141 million). Using the specific identification method to determine cost, the gross realized gains on those sales were $1 million for 2004 (2003 - $1 million; 2002 - less than $1 million). Net realized and unrealized gains and losses are reflected in regulatory assets on Ameren’s and UE’s Consolidated Balance Sheets. This reporting is consistent with the method we use to account for the decommissioning costs recovered in rates. Gains or losses on assets in the trust fund could result in lower or higher funding requirements for decommissioning costs, which we believe would be reflected in electric rates paid by UE’s customers.

The following table presents the costs and fair values of investments in debt and equity securities in the nuclear decommissioning trust fund at December 31, 2004, and 2003:


Security Type	Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
2004:
Debt securities	$	65	$	2	$	-	$	67
Equity securities		99		65		7		157
Cash equivalents		11		-		-		11
Total	$	175	$	67	$	7	$	235
2003:
Debt securities	$	62	$	2	$	-	$	64
Equity securities		96		56		9		143
Cash equivalents		5		-		-		5
Total	$	163	$	58	$	9	$	212

The following table presents the costs and fair values of investments in debt securities according to their contractual maturities at December 31, 2004:

NOTE 18 - SEGMENT INFORMATION

Ameren’s reportable segment Utility Operations comprises its electric generation and electric and gas transmission and distribution operations. It includes the operations of UE, CIPS, Genco, CILCORP and CILCO. Ameren’s reportable segment Other consists of the parent holding company, Ameren Corporation. The operations of IP are included in Ameren’s Utility Operations segment from September 30, 2004.

The accounting policies for segment data are the same as those described in Note 1 - Summary of Significant Accounting Policies. Segment data include intersegment revenues, as well as a charge for allocating costs of administrative support services to each of the operating companies, which, in each case, is eliminated upon consolidation. Ameren Services allocates administrative support services based on various factors, such as headcount, number of customers, and total assets.

The following table presents information about the reported revenues, net income, and total assets of Ameren for the years ended December 31, 2004, 2003 and 2002:

Utility Operations

Other

Reconciling Items

Total

2004:^(a)

Operating revenues

6,342

(1,182)^(c)

5,160

Net income

526

530

Total assets

16,817

617

17,434

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	Utility Operations		Other			Reconciling Items		Total
2003:⁽^b⁾
Operating revenues	$	5,707	$	-		$	(1,099)^(c)	$	4,608
Net income		546		(22	)		-		524
Total assets		13,475		761			-		14,236
2002:⁽^b⁾
Operating revenues	$	4,912	$	-		$	(1,071)^(c)	$	3,841
Net income		384		(2	)		-		382
Total assets		11,037		1,114			-		12,151

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004.

(b)	Excludes amounts for CILCORP prior to the acquisition date of January 31, 2003.

(c)	Elimination of intercompany revenues.

The following table presents specified items included in Ameren’s segment profit (loss) for the years ended December 31, 2004, 2003 and 2002:


	Utility Operations		Other			Reconciling Items			Total
2004:^(a)
Interest expense	$	359	$	24		$	(105)^(c)	⁾	$	278
Depreciation and amortization		557		-			-			557
Income tax		287		(5	)		-			282
2003:^(b)
Interest expense	$	344	$	29		$	(96)^(c)		$	277
Depreciation and amortization		519		-			-			519
Income tax		305		(4	)		-			301^(d)
2002:^(b)
Interest expense	$	279	$	28		$	(93)^(c)		$	214
Depreciation and amortization		431		-			-			431
Income tax		244		(7	)		-			237

(a)	Excludes amounts for IP prior to the acquisition date of September 30, 2004.

(b)	Excludes amounts for CILCORP prior to the acquisition date of January 31, 2003.

(c)	Elimination of intercompany interest charges.

(d)	Does not include income tax expense related to the cumulative effect gain recognized upon adoption of SFAS No. 143.

All construction expenditures for the years ended December 31, 2004, 2003 and 2002, were in the Utility Operations segment.

SELECTED QUARTERLY INFORMATION (Unaudited) (In millions, except per share amounts)

Ameren^(a) Quarter Ended	Operating Revenues		Operating Income		Income Before Cumulative Effect of Change in Accounting Principle		Net Income		Income Before Cumulative Effect of Change in Accounting Principle per Common Share		Earnings per Common Share -- Basic
March 31, 2004	$	1,216	$	216	$	97	$	97	$	0.55	$	0.55
March 31, 2003		1,108		201		83		101		0.52		0.63
June 30, 2004		1,152		246		118		118		0.65		0.65
June 30, 2003		1,088		250		110		110		0.68		0.68
September 30, 2004		1,317		413		232		232		1.20		1.20
September 30, 2003		1,353		500		275		275		1.70		1.70
December 31, 2004		1,475		203		83		83		0.42		0.42
December 31, 2003		1,059		139		38		38		0.24		0.24

(a)	Includes amounts for CILCORP since the acquisition date of January 31, 2003 and for IP since the acquisition date of September 30, 2004.


UE Quarter Ended	Operating Revenues		Operating Income		Net Income		Net Income Available to Common Stockholder
March 31, 2004	$	620	$	113	$	58	$	57
March 31, 2003		620		131		68		67
June 30, 2004		683		193		109		107
June 30, 2003		636		188		107		105
September 30, 2004		793		306		182		181
September 30, 2003		816		380		225		224
December 31, 2004		564		61		30		28
December 31, 2003		565		88		47		45

158


CIPS Quarter Ended	Operating Revenues		Operating Income (Loss)			Net Income (Loss)			Net Income (Loss) Available to Common Stockholder
March 31, 2004	$	212	$	17		$	10		$	9
March 31, 2003		209		6			2			1
June 30, 2004		167		19			8			8
June 30, 2003		167		9			3			3
September 30, 2004		187		36			23			22
September 30, 2003		196		31			26			25
December 31, 2004		169		(14	)		(9	)		(10	)
December 31, 2003		170		(1	)		(2	)		(3	)

Genco Quarter Ended	Operating Revenues		Operating Income		Income Before Cumulative Effect of Change in Accounting Principle		Net Income
March 31, 2004	$	216	$	70	$	29	$	29
March 31, 2003		206		58		21		39
June 30, 2004		208		49		17		17
June 30, 2003		173		41		10		10
September 30, 2004		233		70		29		29
September 30, 2003		217		53		17		17
December 31, 2004		219		76		32		32
December 31, 2003		192		45		9		9


CILCORP^(a) Quarter Ended	Operating Revenues		Operating Income		Income (Loss) Before Cumulative Effect of Change in Accounting Principle			Net Income (Loss)
March 31, 2004	$	240	$	20	$	4		$	4
March 31, 2003		289		28		8			12
June 30, 2004		140		7		(4	)		(4	)
June 30, 2003		192		10		-			-
September 30, 2004		146		8		2			2
September 30, 2003		218		33		11			11
December 31, 2004		196		26		8			8
December 31, 2003		227		14		-			-

(a)	Includes predecessor information for periods prior to January 31, 2003.

CILCO Quarter Ended	Operating Revenues		Operating Income (Loss)			Income (Loss) Before Cumulative Effect of Change in Accounting Principle			Net Income (Loss)			Net Income (Loss) Available to Common Stockholder
March 31, 2004	$	225	$	15		$	6		$	6		$	6
March 31, 2003		246		24			11			35			35
June 30, 2004		134		8			3			3			2
June 30, 2003		172		12			5			5			4
September 30, 2004		142		13			9			9			9
September 30, 2003		206		29			15			15			15
December 31, 2004		187		22			14			14			13
December 31, 2003		215		(12	)		(10	)		(10	)		(11	)

IP^(a) Quarter Ended	Operating Revenues		Operating Income		Income Before Cumulative Effect of Change in Accounting Principle		Net Income		Net Income Available to Common Stockholder
March 31, 2004	$	457	$	45	$	37	$	37	$	36
March 31, 2003		461		50		34		32		31
June 30, 2004		324		33		24		24		24
June 30, 2003		328		33		18		18		18
September 30, 2004		379		68		51		51		50
September 30, 2003		401		57		40		40		39
December 31, 2004		379		62		28		28		27
December 31, 2003		378		38		27		27		27

(a)	Includes predecessor information for periods prior to September 30, 2004.

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE.

None.

159

ITEM 9A. CONTROLS AND PROCEDURES.

Only Ameren as an “accelerated filer”, with respect to the reporting requirements of the Exchange Act was required to comply with Section 404 of the Sarbanes-Oxley Act of 2002 and related SEC regulations as to management’s assessment of internal control over financial reporting for the 2004 fiscal year. UE, CIPS, Genco, CILCORP, CILCO and IP are not accelerated filers and were not required to comply with Section 404 of the Sarbanes-Oxley Act of 2002 and related SEC regulations as to management’s assessment of internal control over financial reporting for the 2004 fiscal year.

(a)	Evaluation of Disclosure Controls and Procedures

As of December 31, 2004, the principal executive officer and principal financial officer of each of the Ameren Companies have evaluated the effectiveness of the design and operation of such Registrant’s disclosure controls and procedures (as defined in Rules 13a - 15(e) and 15d - 15(e) of the Exchange Act). Based upon that evaluation, the principal executive officer and principal financial officer of each of the Ameren Companies have concluded that such disclosure controls and procedures are effective in timely alerting them to any material information relating to such Registrant that is required in such Registrant’s reports filed or submitted to the SEC under the Exchange Act.

(b)	Management’s Report on Internal Control over Financial Reporting

Management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rules 13a - 15(f) and 15d - 15(f). Under the supervision and with the participation of management, including the principal executive officer and principal financial officer, an evaluation was conducted of the effectiveness of Ameren’s internal control over financial reporting based on the framework in Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Based on that evaluation under the framework in Internal Control - Integrated Framework issued by the COSO, management concluded that Ameren’s internal control over financial reporting was effective as of December 31, 2004. Management’s assessment of the effectiveness of Ameren’s internal control over financial reporting as of December 31, 2004, has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report herein under Part II, Item 8.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Management has excluded IP from its assessment of internal control over financial reporting as of December 31, 2004, because it was acquired by Ameren in a purchase business combination on September 30, 2004. PricewaterhouseCoopers LLP, Ameren’s independent registered public accounting firm, also excluded IP from its audit of internal control over financial reporting. IP is a wholly owned subsidiary of Ameren whose total assets and total revenues represented 18% and 7%, respectively, of Ameren’s consolidated financial statement amounts as of, and for the year ended, December 31, 2004.

(c)	Change in Internal Controls

There has been no change in the Ameren Companies’ internal control over financial reporting during their most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, their internal control over financial reporting, except for the modification of certain of the internal controls of IP to make them consistent with the internal controls of the other Ameren Companies, and the application of Ameren’s existing controls to include the operations of IP.

ITEM 9B. OTHER INFORMATION.

The Ameren Companies have no information reportable under this item that is required to be disclosed in a report on SEC Form 8-K during the fourth quarter of 2004, which has not previously been reported on an SEC Form 8-K.

160

PART III

ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANTS.

Information required by Items 401 and 405 of SEC Regulation S-K for Ameren will be included in its definitive proxy statement for its 2005 annual meeting of shareholders filed pursuant to SEC Regulation 14A and is incorporated herein by reference. Information required by these SEC Regulation S-K items for UE, CIPS and CILCO will be included in each company’s definitive information statement for its 2005 annual meetings of shareholders filed pursuant to Regulation 14C and is incorporated herein by reference. With respect to Genco and CILCORP, this information is omitted in reliance on General Instruction I(2) of Form 10-K. Information required by SEC Regulation S-K Items 401 and 405 for IP is set forth at the conclusion of this Item 10.

Information concerning executive officers of the Ameren Companies required by Item 401 of SEC Regulation S-K is reported under a separate caption entitled “Executive Officers of the Registrants” in Part I of this report.

As “controlled companies” of their ultimate parent, Ameren, as defined by the NYSE listing standards, UE, CIPS, Genco, CILCORP, CILCO and IP do not have separately designated standing audit committees of their own, but instead use Ameren’s Audit Committee to perform such committee functions for their boards of directors as permitted under exemptions provided in the NYSE listing standards. Harvey Saligman serves as chairman of Ameren’s Audit Committee and Richard A. Liddy, Richard A. Lumpkin, Paul L. Miller Jr., and Douglas R. Oberhelman serve as members. The board of directors of Ameren has determined that it has one Audit Committee financial expert serving on its Audit Committee. He is Douglas R. Oberhelman, and he has been determined by Ameren’s board of directors to be “independent” as that term is used in SEC Regulation 14A.

Also in accordance with exemptions provided under the NYSE listing standards, the boards of directors of UE, CIPS, Genco, CILCORP, CILCO and IP use the Nominating and Corporate Governance Committee of Ameren’s board to perform such committee functions. This committee is responsible for the nomination of directors and corporate governance practices. Ameren’s Nominating and Corporate Governance Committee will consider director nominations from shareholders in accordance with its Policy Regarding Nominations of Directors, which can be found on Ameren’s Internet Web site (http://www.ameren.com). This policy became applicable to IP upon its acquisition by Ameren on September 30, 2004.

To provide for ethical conduct in its financial management and reporting, Ameren has adopted a Code of Ethics that applies to the principal executive officer, the principal financial officer, the principal accounting officer and controller, and the treasurer of the Ameren Companies. Ameren has also adopted a Code of Business Conduct that applies to the directors, officers and employees of the Ameren Companies, referred to as the Corporate Compliance Policy. The Ameren Companies make available free of charge through Ameren’s Internet site (http://www.ameren.com) the Code of Ethics and Corporate Compliance Policy. These documents are also available without charge in print upon written request to Ameren Corporation, Attention: Secretary, P.O. Box 66149, St. Louis, Missouri 63166-6149. Any amendment to, or waiver of, the Code of Ethics and Corporate Compliance Policy will be posted on Ameren’s Internet site within five business dates following the date of the amendment or waiver.

Information Concerning IP’s Directors as Required by Item 401 of SEC Regulation S-K

The current members of IP’s board of directors are Warner L. Baxter, Scott A. Cisel, Daniel F. Cole, Gary L. Rainwater, Steven R. Sullivan, Thomas R. Voss, and David A. Whiteley, each of whom is an executive officer of IP or an affiliate. For each director’s age as of December 31, 2004, and business background for at least the last five years, refer to “Executive Officers of the Registrants” in Part I of this report. All of the directors were initially elected by directors upon Ameren’s acquisition of IP in September 2004, except for Cisel, who was elected by the directors to fill a vacancy on the board in October 2004. All of these directors have been nominated by Ameren’s Nominating and Corporate Governance Committee for re-election to IP’s Board at its annual meeting of shareholders to be held on April 26, 2005, to serve until the next annual meeting of shareholders and until their respective successors have been duly elected and qualified. Each nominee has consented to being nominated for director and has agreed to serve if elected. No arrangement or understanding exists between any nominee and IP or, to IP’s knowledge, any other person or persons pursuant to which any nominee was or is to be selected as a director or nominee. There are no family relationships among any directors, executive officers, or people nominated or chosen by IP to become directors or executive officers. See Item 13 under Part III of this report for certain reportable family relationships with nonexecutive officers. IP has been informed that Ameren intends to cast the votes of all of the outstanding shares of common stock of IP for the election of the nominees for directors named above. Accordingly, all the nominees are expected to be re-elected.

161

Section 16(a) Beneficial Ownership Reporting Compliance (for IP as Required by Item 405 of SEC Regulation S-K)

Section 16(a) of the Exchange Act, as amended, requires IP’s directors and executive officers and persons who own more than 10% of IP’s common stock to file with the SEC and the NYSE reports of their ownership in IP’s preferred stock, and, in some cases, of its ultimate parent’s common stock, and of changes in that ownership. SEC regulations also require IP to identify in this report any person subject to this requirement who failed to file any such report on a timely basis. Based solely on a review of the filed reports and written representations that no other reports are required, each of IP’s directors and executive officers complied with all such filing requirements during 2004.

ITEM 11. EXECUTIVE COMPENSATION.

Information required by Item 402 of SEC Regulation S-K for Ameren will be included in its definitive proxy statement for its 2005 annual meeting of shareholders filed pursuant to SEC Regulation 14A and is incor-porated herein by reference. Information required by this SEC Regulation S-K item for UE, CIPS and CILCO will be included in each company’s definitive information statement for their 2005 annual meetings of shareholders filed pursuant to Regulation 14C and is incorporated herein by reference. With respect to Genco and CILCORP, this information is omitted in reliance on General Instruction I(2) of Form 10-K. Information required by SEC Regulation S-K Item 402 for IP is as follows.

Compensation Tables for IP

The following tables set forth compensation information for the periods indicated for IP’s chairman and chief executive officer and the four other most highly compensated executive officers of IP who were serving at the end of 2004, named in the Summary Compensation Table below (the “IP Named Executive Officers”). No options were granted in fiscal year 2004 to any IP Named Executive officer. The Summary Compensation Table below also includes compensation information for Larry F. Altenbaumer and R. Blake Young, who each served as IP’s chief executive officer at different times during 2004 prior to Ameren’s acquisition of IP from Dynegy and its subsidiaries on September 30, 2004. The compensation of Altenbaumer and Young was set according to the policy of Dynegy prior to Ameren’s acquisition of IP.

Summary Compensation Table


	Annual Compensation			Long-term Compensation Awards
Name and Principal Position^(a)	Year	Salary($)	Bonus($)^(b)	Restricted Stock Awards ($)^(c)	Securities Underlying Options (#)^(d)	All Other Compensation ($)^(e)
G.L. Rainwater Chairman and Chief Executive Officer, IP, CIPS and CILCO; Chairman, Chief Executive Officer and President, Ameren, UE, CILCORP and Ameren Services	2004	650,000	507,000	552,512	-	20,973
	2003	500,000	397,500	374,987	-	20,718
	2002	500,000	200,000	375,020	-	22,237
W.L. Baxter Executive Vice President and Chief Financial Officer, IP, CIPS, Ameren, UE, Ameren Services, Genco, CILCORP and IP	2004	420,000	273,000	315,019	-	12,168
	2003	340,834	287,340	191,984	-	12,013
	2002	293,333	128,000	168,003	-	3,408
T.R. Voss^(f) Senior Vice President, IP, CIPS, UE, Ameren Services, CILCORP and CILCO; President, Resources Company and Ameren Energy	2004	310,000	201,500	186,009	-	14,190
	2003	270,417	202,900	156,019	-	14,241
	2002	260,000	88,000	156,018	-	15,869
D.F. Cole Senior Vice President, IP, CIPS, UE, Ameren Services, CILCORP, CILCO and Genco	2004	292,000	148,050	175,212	-	12,372
	2003	280,000	176,970	167,981	-	12,571
	2002	280,000	89,600	168,003	-	12,473
S.R. Sullivan Senior Vice President, General Counsel and Secretary, IP, Ameren, UE, CIPS, CILCO, CILCORP, Genco, Resources Company, Ameren Energy and Ameren Services	2004	290,000	150,800	174,007	-	8,163
	2003	254,771	155,760	98,198	-	9,897
	2002	245,500	73,500	98,218	-	10,596

162

	Annual Compensation				Long-term Compensation Awards
Name and Principal Position^(a)	Year		Salary($)	Bonus($)^(b)	Restricted Stock Awards ($)^(c)	Securities Underlying Options (#)^(d)	All Other Compensation ($)^(e)
Larry F. Altenbaumer^(g) Former President, IP	2004		129,231	-	-	-	394,598
	2003	350,000		175,000	-	-	6,000
	2002	288,770		-	-	90,000	5,250
R. Blake Young^(h) Former President, IP	2004		(h)	(h)	(h)	(h)	(h)
	2003	(h)		(h)	(h)	(h)	(h)
	2002	(h)		(h)	(h)	(h)	(h)

(a) Includes compensation received as an officer of IP and its affiliates (except for Altenbaumer and Young, former chief executive officers of IP).

(b) Amounts for each fiscal year represent bonus compensation earned for that year payable in the subsequent year.

(c) Restricted stock awards relate to Ameren common stock. This column is based on the closing market price of Ameren common stock on the date the restricted stock was awarded

(for 2004, $46.34 per share on February 13, 2004; for 2003, $39.74 per share on February 14, 2003; and for 2002, $42.50 per share on February 8, 2002). The aggregate number

of restricted shares of Ameren common stock held at December 31, 2004 and the value of such holdings, based on the number of restricted shares for which restrictions have

not lapsed times the closing market price at December 31, 2004 ($50.14 per share), was 41,329 shares and $2,072,236 for Rainwater; 20,118 shares and $1,008,717 for Baxter;

13,245 shares and $664,104 for Voss; 13,343 shares and $669,018 for Cole; and 12,332 shares and $618,326 for Sullivan. Restricted shares have the potential to vest equally over a

seven-year period from date of grant (one-seventh on each anniversary date) based upon the achievement of certain Ameren performance levels and upon the achievement of

required stock ownership levels based on position and salary (ownership levels range from three to five times salary). The vesting period is reduced from seven years to three

years if Ameren’s ongoing earnings per share achieve a prescribed growth rate over the three-year period. Restricted stock that would otherwise vest remain restricted until

prescribed minimum stock ownership levels are satisfied by the IP Named Executive Officer. Upon the occurrence of a “change in control” as defined in Ameren's Long-Term

Incentive Plan of 1998, all restrictions and vesting requirements with respect to the restricted stock terminate. Dividends paid on restricted shares are reinvested in additional

shares of Ameren common stock, which vest concurrently with the restricted shares. The IP Named Executive Officers are entitled to voting privileges associated with the

restricted shares to the extent the restricted shares have not been forfeited.

(d) Options relate to Ameren common stock, except with respect to Altenbaumer, whose options were granted under a Dynegy plan in Dynegy common stock.

(e) For the IP Named Executive Officers, amounts include matching contributions to Ameren’s 401(k) plan, the dollar value of insurance premiums paid by Ameren with respect to term

life insurance, and above-market earnings on deferred compensation. See "Arrangements with IP Named Executive Officers - Deferred Compensation Plans" below. For fiscal year

2004, earnings on deferred compensation were not above market as defined by SEC rules. For fiscal year 2004, the amount includes (1) matching contributions to Ameren’s 401(k)

plan and (2) the dollar value of insurance premiums paid by Ameren with respect to term life insurance as follows:

(1) (2)

G.L. Rainwater $ 9,851 $ 11,122

W.L. Baxter 10,480 1,688

T.R. Voss 9,358 4,832

D.F. Cole 9,788 2,584

S.R. Sullivan 6,808 1,355

(f) Effective January 1, 2005, Voss was elected executive vice president and chief operating officer of Ameren in addition to his other named positions.

(g) Altenbaumer served as president of IP until his retirement effective April 1, 2004. All compensation presented for Altenbaumer in this table relates to compensation paid prior to

Ameren’s acquisition of IP based on Dynegy’s policy. His 2003 bonus amount and $350,000 of his 2004 “All Other Compensation” were paid pursuant to his severance agreement

and release entered into with Dynegy and IP in January 2004 in connection with his resignation from IP and Dynegy, which is described under “Employment Contracts and

Change-In-Control Arrangements” in Part III, Item 11. Executive Compensation, of IP’s 2003 Annual Report on Form 10-K. The balance of Altenbaumer’s 2004 “All Other

Compensation” consisted of $40,385 as payment for banked vacation earned in 2000 and $4,213 in matching contributions to IP’s 401(k) plan.

(h) Young is an executive officer of Dynegy who succeeded Altenbaumer as president of IP from April 1, 2004, until the completion of Ameren’s acquisition of IP on September 30,

2004. Young was not compensated by IP for serving as its president. He was compensated by Dynegy for services rendered in all capacities to Dynegy and its affiliates, including

IP. Information with respect to Young’s compensation for 2004 is expected to be reported in Dynegy’s definitive proxy statement for its 2005 annual meeting of shareholders,

and his compensation for 2003 and 2002 was reported in Dynegy’s definitive proxy statement for its 2004 annual meeting of shareholders, neither of which shall be deemed to be

incorporated by reference into this report and for which the Ameren Companies accept no responsibility.

163

Aggegated Option Exercises in 2004 and Year-End Values for the IP Named Executive Officers^(a)

			Unexercised Options at Year End(#)		Value of In-the-Money Options at Year End($)^(b)
Name	Shares Acquired on Exercise (#)	Value Realized ($)	Exercisable	Unexercisable	Exercisable	Unexercisable
G.L. Rainwater	78,510	1,029,488	0	8,150	0	155,991
W.L. Baxter	37,675	335,015	0	3,525	0	67,469
T.R. Voss	32,950	450,398	8,150	8,150	155,991	155,991
D.F. Cole	1,900	14,135	38,500	8,150	649,065	155,991
S.R. Sullivan	26,575	234,329	0	3,525	0	67,469

(a) No options were granted by Ameren in 2004.

(b) These columns represent the excess of the closing price of Ameren’s common stock of $50.14 per share, as of December 31, 2004, above the exercise price of the options. The

amounts under the Exercisable column report the “value” of options that are vested and therefore could be exercised. The Unexercisable column reports the “value” of options

that are not vested and therefore could not be exercised as of December 31, 2004. There is no guarantee that, if and when these options are exercised, they will have this value.

Upon the occurrence of a “change in control” as defined in Ameren's Long-Term Incentive Plan of 1998, all options become vested and immediately exercisable.

Ameren Retirement Plan (as it applies to the IP Named Executive Officers)

Most salaried employees of Ameren and its subsidiaries, including the IP Named Executive Officers, earn benefits under the Ameren Retirement Plan immediately upon employment. Benefits generally become vested after five years of service. On an annual basis a bookkeeping account in a participant’s name is credited with an amount equal to a percentage of the participant’s pensionable earnings for the year. Pensionable earnings include base pay, overtime and annual bonuses, which are equivalent to amounts shown as “Annual Compensation” in the Summary Compensation Table above. The applicable percentage is based on the participant’s age as of December 31 of that year. If the participant was an employee prior to July 1, 1998, an additional transition credit percentage is credited to the participant’s account through 2007 (or an earlier date if the participant had less than 10 years of service on December 31, 1998).


Participant’s Age on December 31	Regular Credit for Pensionable Earnings^(a)	Transition Credit Pensionable Earnings	Total Credits
Less than 30	3%	1%	4%
30 to 34	4%	1%	5%
35 to 39	4%	2%	6%
40 to 44	5%	3%	8%
45 to 49	6%	4.5%	10.5%
50 to 54	7%	4%	11%
55 and over	8%	3%	11%

(a)	An additional regular credit of 3% is received for pensionable earnings above the Social Security wage base.

These accounts also receive interest credits based on the average yield for one-year U.S. Treasury Bills for the previous October, plus 1%. The minimum interest credit is 5%. In addition, certain annuity benefits earned by participants under prior plans as of December 31, 1997, were converted to additional credit balances under the Ameren Retirement Plan as of January 1, 1998. Effective January 1, 2001, an Enhancement Account was added that provides a $500 additional credit at the end of each year. When a participant terminates employment, the amount credited to the participant’s account is converted to an annuity or paid to the participant in a lump sum. The participant can also choose to defer distribution, in which case the account balance is credited with interest at the applicable rate until the future date of distribution. Benefits are not subject to any deduction for Social Security or other offset amounts.

In certain cases, pension benefits under the Retirement Plan are reduced to comply with maximum limitations imposed by the Internal Revenue Code. A Supplemental Retirement Plan is maintained by Ameren to provide for a supplemental benefit equal to the difference between the benefit that would have been paid if such Code limitations were not in effect and the reduced benefit payable as a result of such Code limitations. The plan is unfunded and is not a qualified plan under the Internal Revenue Code.

164

The following table shows the estimated annual retirement benefits, including supplemental benefits, payable to each IP Named Executive Officer listed if he were to retire at age 65. These estimates use total compensation through December 31, 2004, and project his 2005 base salary to retirement, excluding bonuses. The estimates show payments made in the form of a single life annuity.


Name	Year of 65th Birthday	Estimated Annual Benefit
G.L. Rainwater	2011	$ 203,000
W. .L. Baxter	2026	183,000
T.R. Voss	2012	142,000
D.F. Cole	2018	142,000
S.R. Sullivan	2025	168,000

Compensation of IP Directors

Directors who are employees or directors of Ameren or any of its subsidiaries receive no additional compensation for their services as IP directors. All directors of IP are executive officers of Ameren or its subsidiaries.

Arrangements with IP Named Executive Officers

Change of Control Severance Plan

Under the Ameren Corporation Change of Control Severance Plan, designated officers of Ameren and its subsidiaries, including the IP Named Executive Officers, are entitled to receive severance benefits if their employment is terminated under certain circumstances within three years after a “change of control.” A “change of control” occurs, in general, if (1) any individual, entity or group acquires 20% or more of the outstanding Common Stock of Ameren or of the combined voting power of the outstanding voting securities of Ameren; (2) individuals who, as of the effective date of the plan, constitute the board of directors of Ameren, or who have been approved by a majority of the board, cease for any reason to constitute a majority of the board; (3) Ameren enters into certain business combinations, unless certain requirements are met regarding continuing ownership of the outstanding common stock and voting securities of Ameren and the membership of its board of directors; or (4) approval by Ameren shareholders of a complete liquidation or dissolution of Ameren.

Severance benefits are based upon a severance period of two or three years, depending on the officer’s position. An officer entitled to severance will receive a cash lump sum equal to the following: (1) salary and unpaid vacation pay through the date of termination; (2) a pro rata bonus for the year of termination, and base salary and bonus for the severance period; (3) continued employee welfare benefits for the severance period; (4) a cash payment equal to the actuarial value of the additional benefits the officer would have received under Ameren’s qualified and supplemental retirement plans if employed for the severance period; (5) up to $30,000 for the cost of outplacement services; and (6) reimbursement for any excise tax imposed on such benefits as excess payments under the Internal Revenue Code.

Deferred Compensation Plans

Under the Ameren Deferred Compensation Plan and its Executive Incentive Compensation Program Elective Deferral Provisions, executive officers and certain key employees, including the IP Named Executive Officers, may choose to defer up to 30% of their salary and 25%, 50%, 75%, or 100% of their bonus. All of the IP Named Executive Officers have deferred amounts under one or both of the plans. The minimum amount of salary that can be deferred in any calendar year is $3,500 and the minimum amount of bonus that can be annually deferred is $2,000. Deferred amounts under both plans earn interest at 150% of the average Mergent's Seasoned AAA Corporate Bond Yield Index (“Mergent’s Index,” formerly called Moody’s Index) until the participant retires or attains 65 years of age. After the participant retires, attains 65 years of age, or dies, the deferred amounts under the plans earn the average Mergent's Index rate. For 2004, the average Mergent’s Index rate was 5.67%, 150% of that was 8.51%. A participant may choose to receive the deferred amounts at retirement in a lump sum payment or in installments over a set period, up to 15 years with respect to deferred salary and 10 years with respect to deferred bonus. If a participant revokes the deferral election under either plan, deferred amounts will be distributed in a lump sum with all interest credited to the deferral account forfeited. In the event a participant terminates employment with Ameren prior to attaining retirement age and after the occurrence of a change in control (as defined in such plans), the balance in such participant’s deferral account, including interest payable at 150% of the average Mergent’s Index is distributable in a lump sum to the participant within 30 days of the date the participant terminates employment.

165

Severance Agreement and Consulting Agreement with Former IP President

In January 2004, prior to Ameren’s acquisition of IP, Dynegy and IP entered into a severance agreement and release and a consulting agreement with Larry F. Altenbaumer, then president of IP. These agreements are described under “Employment Contracts and Change-In-Control Arrangements” in Part III, Item 11, Executive Compensation, of IP’s 2003 Annual Report on Form 10-K.

Compensation Committee Interlocks and Insider Participation

The members of the Human Resources Committee of the Ameren board of directors performed compensation-related committee functions for IP for the fourth quarter of the 2004 fiscal year after Ameren’s acquisition of IP. Its members during this period were Gordon R. Lohman, Thomas A. Hays, Richard A. Liddy, and John Peters MacCarthy. No member of this committee was at any time during this part of the 2004 fiscal year or at any other time an officer or employee of Ameren or IP, and no member had any relationship with Ameren or IP requiring disclosure under applicable SEC rules. No executive officer of Ameren or IP has served on the board of directors or compensation committee of any other entity that has or has had one or more executive officers who served as a member of Ameren’s or IP’s board of directors or Ameren’s Human Resources Committee during the 2004 fiscal year. Prior to Ameren’s acquisition of IP, the members of Dynegy’s compensation committee performed committee functions for IP. There are no matters relating to interlocks or insider participation during this period that IP is required to report.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS.

Equity Compensation Plan Information

The following table presents information as of December 31, 2004, with respect to the shares of Ameren’s common stock that may be issued under its existing equity compensation plan.


Plan Category	Number of Securities to be Issued Upon Exercise of Outstanding Options, Warrants and Rights (a)	Weighted-Average Exercise Price of Outstanding Options, Warrants and Rights (b)	Number of Securities Remaining Available for Future Issuance Under Equity Compensation Plans (excluding securities reflected in column (a) ) (c)
Equity compensation plans approved by security holders^(a)	411,239	$ 33.38	1,704,137^(b)
Equity compensation plans not approved by security holders	-	-	-
Total	411,239	$ 33.38	1,704,137

(a) Consists of the Ameren Corporation Long-term Incentive Plan of 1998 which was approved by shareholders in April 1998, and expires on April 1, 2008.

(b) Excludes an aggregate of 738,848 restricted shares of Ameren common stock issued under the Ameren Corporation Long-term Incentive Plan of 1998 in 2001 through 2005.

UE, CIPS, Genco, CILCORP, CILCO and IP do not have separate equity compensation plans.

Security Ownership of Certain Beneficial Owners and Management

The information required by Item 403 of SEC Regulation S-K for Ameren will be included in its definitive proxy statement for its 2005 annual meeting of shareholders filed pursuant to SEC Regulation 14A and is incor-porated herein by reference. Information required by this SEC Regulation S-K item for UE, CIPS and CILCO will be included in each company’s definitive information statement for its 2005 annual meetings of shareholders filed pursuant to Regulation 14C and is incorporated herein by reference. With respect to Genco and CILCORP, this information is omitted in reliance on General Instruction I(2) of Form 10-K. Information required by SEC Regulation S-K Item 403 for IP is as follows.

166

Securities of IP

All 23 million outstanding shares of IP’s common stock and 662,924 shares, or approximately 73%, of IP’s preferred stock were acquired by Ameren from Dynegy and its subsidiaries on September 30, 2004, and are owned by Ameren as of the date of this report. This acquisition resulted in a change in control of IP. IP is now a subsidiary of Ameren.

None of IP’s outstanding shares of preferred stock were owned by directors, nominees for director, or executive officers of IP as of February 1, 2005. To our knowledge, other than Ameren, which as noted above owns 73% of IP’s outstanding preferred stock, there are no beneficial owners of 5% or more of IP’s outstanding shares of preferred stock as of February 1, 2005, but no independent inquiry has been made to determine whether any shareholder is the beneficial owner of shares not registered in the name of such shareholder or whether any shareholder is a member of a shareholder group.

Securities of Ameren (As Applicable to IP)

The following table sets forth certain information known to IP with respect to beneficial ownership of Ameren common stock as of February 1, 2005, for (1) each director and nominee for director of IP, (2) the IP Named Executive Officers, and (3) all executive officers, directors, and nominees for director as a group. The table below does not include information regarding Larry F. Altenbaumer and R. Blake Young, who each served as IP’s president at different times during 2004 prior to Ameren’s acquisition of IP.


Name	Number of Shares of Common Stock Beneficially Owned^(a)	Percent Owned^(b)
Warner L. Baxter	28,266	*
Scott A. Cisel	7,096	*
Daniel F. Cole	66,424	*
Gary L. Rainwater	70,591	*
Steven R. Sullivan	16,434	*
Thomas R. Voss	42,447	*
David A. Whiteley	23,215	*
All directors, nominees for director and executive officers as a group (12)	300,812	*

* Less than 1%
(a) This column lists voting securities, including Ameren restricted stock held by executive officers over whom the officers have voting power but no investment power. It also

includes shares issuable within 60 days upon the exercise of Ameren stock options as follows: Baxter, 3,525; Cole, 46,650; Rainwater, 8,150; Sullivan, 3,525; Voss, 16,300;

and Whiteley, 7,880. Reported shares include those for which a director, nominee for director, or executive officer has voting or investment power because of joint or fiduciary

ownership of the shares or a relationship with the record owner, most commonly a spouse, even if such director, nominee for director, or executive officer does not claim beneficial

ownership.

(b) For each individual and group included in the table, percentage ownership is calculated by dividing the number of shares beneficially owned by such person or group as

described above by the sum of the 195,291,612 shares of Ameren common stock outstanding on February 1, 2005, and the number of shares of Ameren common stock that such

person or group had the right to acquire on or within 60 days of February 1, 2005, including, but not limited to, upon the exercise of options.

The address of all persons listed above is c/o Illinois Power Company, 500 South 27th Street, Decatur, Illinois 62521-2200.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS.

Information required by Item 404 of SEC Regulation S-K for Ameren will be included in its definitive proxy statement for its 2005 annual meeting of shareholders filed pursuant to SEC Regulation 14A and is incorporated herein by reference. Information required by this SEC Regulation S-K item for UE, CIPS and CILCO will be included in each company’s definitive information statement for its 2005 annual meetings of shareholders filed pursuant to Regulation 14C and is incorporated herein by reference. With respect to Genco and CILCORP, this information is omitted in reliance on General Instruction I(2) of Form 10-K. Information required by SEC Regulation S-K Item 404 for IP is as follows.

During 2004, other than employment by IP or its affiliates, IP had no business relationships with directors and nominees for director required to be reported by SEC rules.

Certain of IP’s current directors and executive officers did have reportable family relationships in 2004. A sister of IP Chairman and Chief Executive Officer Gary L. Rainwater, Patricia A. Fuller, is employed by IP affiliate Ameren Services as a supervisor in its human resources function, for which she received an aggregate salary and bonus of $99,480 for 2004. Wendy C. Brumitt, a daughter of IP Senior Vice President Thomas R. Voss, is employed by IP affiliate UE as an engineer at its Callaway

167

nuclear plant, for which she received an aggregate salary and bonus of $71,047 for 2004. A brother of IP Vice President Dennis W. Weisenborn, Gary L. Weisenborn, is employed by UE as a superintendent at a power plant, for which he received an aggregate salary and bonus of $127,178 for 2004. Diana L. Weisenborn, the wife of Gary L. Weisenborn and sister-in-law of Dennis W. Weisenborn, is employed by Ameren Services as an executive secretary, for which she received aggregate salary and bonus of $60,422 for 2004.

ITEM 14. PRINCIPAL ACCOUNTANT FEES AND SERVICES.

Information required by Item 9(e) of SEC Schedule 14A for the Ameren Companies (including for IP only the period after its acquisition by Ameren) will be included in the definitive proxy statement of Ameren and the definitive information statements of UE, CIPS and CILCO for their 2005 annual meetings of shareholders filed pursuant to SEC Regulations 14A and 14C, respectively, and is incorporated herein by reference. This information as it relates to IP prior to its acquisition by Ameren is expected to be reported in Dynegy’s definitive proxy statement for its 2005 annual meeting of shareholders, which shall not be deemed to be incorporated by reference into this report and for which the Ameren Companies accept no responsibility.

PART IV

ITEM 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

(a)(1) Financial Statements	Page No.
Ameren
Report of Independent Registered Public Accounting Firm	62
Consolidated Statement of Income - Years Ended December 31, 2004, 2003 and 2002	68
Consolidated Balance Sheet - December 31, 2004, and 2003	69
Consolidated Statement of Cash Flows - Years Ended December 31, 2004, 2003 and 2002	70
Consolidated Statement of Common Stockholders’ Equity	71
UE
Report of Independent Registered Public Accounting Firm	63
Consolidated Statement of Income - Years Ended December 31, 2004, 2003 and 2002	72
Consolidated Balance Sheet - December 31, 2004, and 2003	73
Consolidated Statement of Cash Flows - Years Ended December 31, 2004, 2003 and 2002	74
Consolidated Statement of Common Stockholders’ Equity	75
CIPS
Report of Independent Registered Public Accounting Firm	64
Statement of Income - Years Ended December 31, 2004, 2003 and 2002	76
Balance Sheet - December 31, 2004 and 2003	77
Statement of Cash Flows - Years Ended December 31, 2004, 2003 and 2002	78
Statement of Common Stockholders’ Equity	79
Genco
Report of Independent Registered Public Accounting Firm	64
Consolidated Statement of Income - Years Ended December 31, 2004, 2003 and 2002	80
Consolidated Balance Sheet - December 31, 2004 and 2003	81
Consolidated Statement of Cash Flows - Years Ended December 31, 2004, 2003 and 2002	82
Consolidated Statement of Common Stockholder’s Equity	83
CILCORP
Report of Independent Registered Public Accounting Firm (regarding 2004 and 2003)	64
Report of Independent Registered Public Accounting Firm (regarding 2002)	66
Consolidated Statement of Income - Years Ended December 31, 2004, 2003 and 2002	84
Consolidated Balance Sheet - December 31, 2004 and 2003	85
Consolidated Statement of Cash Flows - Years Ended December 31, 2004, 2003 and 2002	86
Consolidated Statement of Common Stockholder’s Equity	87
CILCO
Report of Independent Registered Public Accounting Firm (regarding 2004 and 2003)	65
Report of Independent Registered Public Accounting Firm (regarding 2002)	67
Consolidated Statement of Income - Years Ended December 31, 2004, 2003 and 2002	88
Consolidated Balance Sheet - December 31, 2004, and 2003	89
Consolidated Statement of Cash Flows - Years Ended December 31, 2004, 2003 and 2002	90
Consolidated Statement of Common Stockholders’ Equity	91

168

	Page No.
IP
Report of Independent Registered Public Accounting Firm	65
Consolidated Statement of Income - Years Ended December 31, 2004, 2003 and 2002	92
Consolidated Balance Sheet - December 31, 2004, and 2003	93
Consolidated Statement of Cash Flows - Years Ended December 31, 2004, 2003 and 2002	94
Consolidated Statement of Common Stockholders’ Equity	95

(a)(2) Financial Statement Schedule
Schedule II - Valuation and Qualifying Accounts for the years ended December 31, 2004, 2003 and 2002	170

The above schedule should be read in conjunction with the aforementioned financial statements. Schedules not included have been omitted because they are not applicable or because the required data is shown in the aforementioned financial statements.

(a)(3) Exhibits.

Reference is made to the Exhibit Index commencing on page 178.

(b) Exhibits are listed in the Exhibit Index commencing on page 178.

169


SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
FOR THE YEARS ENDED DECEMBER 31, 2004, 2003 AND 2002
(in millions)
Column A	Column B		Column C					Column D		Column E
Description	Balance at Beginning of Period		(1) Charged to Costs and Expenses			(2) Charged to Other Accounts		Deductions^(a)		Balance at End of Period
Ameren:^(d)
Deducted from assets - allowance for doubtful accounts:
2004	$	13	$	29^(b)		$	-	$	28	$	14
2003		7		30^(c)	⁾		-		24		13
2002		9		20			-		22		7
UE:
Deducted from assets - allowance for doubtful accounts:
2004	$	6	$	14		$	-	$	17	$	3
2003		6		16			-		16		6
2002		7		15			-		16		6
CIPS:
Deducted from assets - allowance for doubtful accounts:
2004	$	1	$	6		$	-	$	6	$	1
2003		1		5			-		5		1
2002		1		5			-		5		1
CILCORP:^(d)
Deducted from assets - allowance for doubtful accounts:
2004	$	6	$	2		$	-	$	5	$	3
2003		2		7			-		3		6
2002		2		2			-		2		2
CILCO:
Deducted from assets - allowance for doubtful accounts:
2004	$	6	$	2		$	-	$	5	$	3
2003		2		7			-		3		6
2002		2		2			-		2		2
IP:^(d)
Deducted from assets - allowance for doubtful accounts:
2004	$	6	$	8		$	-	$	8	$	6
2003		6		5			-		5		6
2002		6		10			-		10		6

(a)	Uncollectible accounts charged off, less recoveries.

(b)	Amount includes $6 million related to IP balance at the date of acquisition on September 30, 2004.

(c)	Amount includes $2 million related to CILCO balance at the date of acquisition on January 31, 2003.

(d)	Ameren 2004 and 2003 amounts include financial activity of IP and CILCORP, subsequent to their respective acquisition dates. Amounts for IP and CILCORP include predecessor and successor financial information in the year of their respective acquisitions.

170

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, each Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. The signatures for each undersigned company shall be deemed to relate only to matters having reference to such company or its subsidiaries.

AMEREN CORPORATION (Registrant)

Date: March 9, 2005 By: /s/ Gary L. Rainwater

Gary L. Rainwater

Chairman, Chief Executive Officer and President

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the date indicated.

/s/ Gary L. Rainwater	Chairman, Chief Executive	March 9, 2005
Gary L. Rainwater	Officer, President and Director
	(Principal Executive Officer)
/s/ Warner L. Baxter	Executive Vice President and	March 9, 2005
Warner L. Baxter	Chief Financial Officer
	(Principal Financial Officer)
/s/ Martin J. Lyons	Vice President and Controller	March 9, 2005
Martin J. Lyons	(Principal Accounting Officer)
*	Director	March 9, 2005
Susan S. Elliott
*	Director	March 9, 2005
Clifford L. Greenwalt
*	Director	March 9, 2005
Thomas A. Hays
*	Director	March 9, 2005
Richard A. Liddy
*	Director	March 9, 2005
Gordon R. Lohman
*	Director	March 9, 2005
Richard A. Lumpkin
*	Director	March 9, 2005
John Peters MacCarthy
*	Director	March 9, 2005
Paul L. Miller, Jr.
*	Director	March 9, 2005
Charles W. Mueller
*	Director	March 9, 2005
Douglas R. Oberhelman
*	Director	March 9, 2005
Harvey Saligman
*	Director	March 9, 2005
Patrick T. Stokes
*By /s/ Warner L. Baxter		March 9, 2005
Warner L. Baxter Attorney-in-Fact

171


	UNION ELECTRIC COMPANY (Registrant)

Date: March 9, 2005	By:	/s/ Gary L. Rainwater
		Gary L. Rainwater
		Chairman, Chief Executive Officer and President

/s/ Gary L. Rainwater	Chairman, Chief Executive	March 9, 2005
Gary L. Rainwater	Officer, President and Director
	(Principal Executive Officer)
/s/ Warner L. Baxter	Executive Vice President, Chief	March 9, 2005
Warner L. Baxter	Financial Officer and Director
	(Principal Financial Officer)
/s/ Martin J. Lyons	Vice President and Controller	March 9, 2005
Martin J. Lyons	(Principal Accounting Officer)
*	Director	March 9, 2005
Thomas R. Voss
*	Director	March 9, 2005
David A. Whiteley
*By /s/ Warner L. Baxter		March 9, 2005
Warner L. Baxter
Attorney-in-Fact

172


	CENTRAL ILLINOIS PUBLIC SERVICE COMPANY (Registrant)

Date: March 9, 2005	By:	/s/ Gary L. Rainwater
		Gary L. Rainwater
		Chairman and Chief Executive Officer

/s/ Gary L. Rainwater	Chairman, Chief Executive Officer	March 9, 2005
Gary L. Rainwater	and Director
	(Principal Executive Officer)
/s/ Warner L. Baxter	Executive Vice President, Chief	March 9, 2005
Warner L. Baxter	Financial Officer and Director
	(Principal Financial Officer)
/s/ Martin J. Lyons	Vice President and Controller	March 9, 2005
Martin J. Lyons	(Principal Accounting Officer)
*	Director	March 9, 2005
Scott A. Cisel
*	Director	March 9, 2005
Daniel F. Cole
*	Director	March 9, 2005
Thomas R. Voss
*	Director	March 9, 2005
David A. Whiteley
*By /s/ Warner L. Baxter		March 9, 2005
Warner L. Baxter
Attorney-in-Fact

173

AMEREN ENERGY GENERATING COMPANY
(Registrant)

Date: March 9, 2005 By: /s/ R. Alan Kelley

R. Alan Kelley

President

/s/ R. Alan Kelley	President and Director	March 9, 2005
R. Alan Kelley	(Principal Executive Officer)
/s/ Warner L. Baxter	Executive Vice President, Chief	March 9, 2005
Warner L. Baxter	Financial Officer and Director
	(Principal Financial Officer)
/s/ Martin J. Lyons	Vice President and Controller	March 9, 2005
Martin J. Lyons	(Principal Accounting Officer)
*	Director	March 9, 2005
Daniel F. Cole
*	Director	March 9, 2005
Gary L. Rainwater
*	Director	March 9, 2005
Thomas R. Voss
*	Director	March 9, 2005
David A. Whiteley
*By /s/ Warner L. Baxter		March 9, 2005
Warner L. Baxter
Attorney-in-Fact

174


	CILCORP INC. (Registrant)

Date: March 9, 2005	By:	/s/ Gary L. Rainwater
		Gary L. Rainwater
		Chairman, Chief Executive Officer and President

/s/ Gary L. Rainwater	Chairman, Chief Executive Officer,	March 9, 2005
Gary L. Rainwater	President and Director
	(Principal Executive Officer)
/s/ Warner L. Baxter	Executive Vice President, Chief	March 9, 2005
Warner L. Baxter	Financial Officer and Director
	(Principal Financial Officer)
/s/ Martin J. Lyons	Vice President and Controller	March 9, 2005
Martin J. Lyons	(Principal Accounting Officer)
*	Director	March 9, 2005
Daniel F. Cole
*	Director	March 9, 2005
Richard A. Liddy
*	Director	March 9, 2005
Thomas R. Voss
*	Director	March 9, 2005
David A. Whiteley
*By /s/ Warner L. Baxter		March 9, 2005
Warner L. Baxter
Attorney-in-Fact

175


	CENTRAL ILLINOIS LIGHT COMPANY (Registrant)

Date: March 9, 2005	By:	/s/ Gary L. Rainwater
		Gary L. Rainwater
		Chairman and Chief Executive Officer

/s/ Gary L. Rainwater	Chairman, Chief Executive Officer	March 9, 2005
Gary L. Rainwater	and Director
	(Principal Executive Officer)
/s/ Warner L. Baxter	Executive Vice President, Chief	March 9, 2005
Warner L. Baxter	Financial Officer and Director
	(Principal Financial Officer)
/s/ Martin J. Lyons	Vice President and Controller	March 9, 2005
Martin J. Lyons	(Principal Accounting Officer)
*	Director	March 9, 2005
Scott A. Cisel
*	Director	March 9, 2005
Daniel F. Cole
*	Director	March 9, 2005
Thomas R. Voss
*By /s/ Warner L. Baxter		March 9, 2005
Warner L. Baxter
Attorney-in-Fact

176


	ILLINOIS POWER COMPANY (Registrant)

Date: March 9, 2005	By:	/s/ Gary L. Rainwater
		Gary L. Rainwater
		Chairman and Chief Executive Officer

/s/ Gary L. Rainwater	Chairman, Chief Executive Officer	March 9, 2005
Gary L. Rainwater	and Director
	(Principal Executive Officer)
/s/ Warner L. Baxter	Executive Vice President, Chief	March 9, 2005
Warner L. Baxter	Financial Officer and Director
	(Principal Financial Officer)
/s/ Martin J. Lyons	Vice President and Controller	March 9, 2005
Martin J. Lyons	(Principal Accounting Officer)
*	Director	March 9, 2005
Scott A. Cisel
*	Director	March 9, 2005
Daniel F. Cole
*	Director	March 9, 2005
Thomas R. Voss
*	Director	March 9, 2005
David A. Whiteley
*By /s/ Warner L. Baxter		March 9, 2005
Warner L. Baxter
Attorney-in-Fact

177

EXHIBIT INDEX

The documents listed below are being filed or have previously been filed on behalf of Ameren, UE, CIPS, Genco, CILCORP and CILCO (collectively the “Ameren Companies”) and IP and are incorporated herein by reference from the documents indicated and made a part hereof. Exhibits not identified as previously filed are filed herewith:

Exhibit Designation	Registrant(s)	Nature of Exhibit	Previously Filed as Exhibit to:
Plan of Acquisition, Reorganization, Arrangement, Liquidation or Succession
2.1	Ameren CILCORP CILCO	Stock Purchase Agreement, dated as of April 28, 2002, by and between AES and Ameren	March 31, 2002, Form 10-Q, Exhibit 2.1, File No. 1-14756
2.2	Ameren CILCORP CILCO	Membership Interest Purchase Agreement, dated as of April 28, 2002, by and between AES and Ameren	March 31, 2002, Form 10-Q, Exhibit 2.2, File No. 1-14756
2.3	Ameren Companies IP	Stock Purchase Agreement, dated as of February 2, 2004, by and between Dynegy Inc. and certain of its subsidiaries and Ameren	February 3, 2004, Combined Ameren Companies Form 8-K, Exhibit 2.1*
2.4	Ameren Companies IP	Amendment No. 1, dated as of March 23, 2004, to Stock Purchase Agreement, dated as of February 2, 2004, by and between Dynegy and certain of its subsidiaries and Ameren	March 24, 2004, Combined Ameren Companies Form 8-K, Exhibit 2.1*
2.5	Ameren Companies IP	Amendment No. 2, dated as of April 30, 2004, to Stock Purchase Agreement, dated as of February 2, 2004 by and between Dynegy and certain of its subsidiaries and Ameren	June 30, 2004, Combined Ameren Companies Form 10-Q, Exhibit 2.1*
2.6	Ameren Companies IP	Amendment No. 3, dated as of May 31, 2004, to Stock Purchase Agreement, dated as of February 2, 2004, by and between Dynegy and certain of its subsidiaries and Ameren	June 30, 2004, Combined Ameren Companies Form 10-Q, Exhibit 2.2*
2.7	Ameren Companies IP	Amendment No. 4, dated as of September 24, 2004, to Stock Purchase Agreement, dated as of February 2, 2004 between Dynegy and certain of its subsidiaries and Ameren	September 30, 2004, Combined Ameren Companies Form 10-Q, Exhibit 2.1*
Articles of Incorporation/ By Laws
3.1(i)	Ameren	Restated Articles of Incorporation of Ameren	File No. 33-64165, Annex F
3.2(i)	Ameren	Certificate of Amendment to Ameren’s Restated Articles of Incorporation filed December 14, 1998	1998 Form 10-K, Exhibit 3(i), File No. 1-14756
3.3(i)	UE	Restated Articles of Incorporation of UE	UE 1993 Form 10-K, Exhibit 3(i), File No. 1-2967
3.4(i)	CIPS	Restated Articles of Incorporation of CIPS	March 31, 1994, CIPS Form10-Q, Exhibit 3(b), File No. 1-3672
3.5(i)	Genco	Articles of Incorporation of Genco	Exhibit 3.1 to Genco’s Registration Statement on Form S-4 File No. 333-56594
3.6(i)	Genco	Amendment to Articles of Incorporation of Genco filed April 19, 2000	Exhibit 3.2 to Genco’s Registration Statement Form S-4 File No. 333-56594
3.7(i)	CILCORP	Articles of Incorporation of CILCORP as amended November 15, 1999	CILCORP 1999 Form 10-K, Exhibit 3, File No. 1-18946
3.8(i)	CILCO	Articles of Incorporation of CILCO as amended April 28, 1998	CILCO 1998 Form 10-K, Exhibit 3, File No. 1-8946
3.9(i)	IP	Amended and Restated Articles of Incorporation of IP, dated September 7, 1994	September 7, 1994, IP Form 8-K, Exhibit 3(a), File No. 1-3004
3.10(ii)	Ameren	By-Laws of Ameren as amended February 13, 2004	Exhibit 4.3, File No. 333-112823
3.11(ii)	UE	By-Laws of UE as amended August 23, 2001	September 30, 2001, UE Form 10-Q, Exhibit 3(ii), File No. 1-2967
3.12(ii)	Ameren CIPS	By-Laws of CIPS as amended October 8, 2004	October 14, 2004, Combined Ameren Companies Form 8-K, Exhibit 3.1*
3.13(ii)	Genco	By-Laws of Genco as amended January 21, 2003	Genco 2002 Form 10-K, Exhibit 3.3, File No. 333-56594
3.14(ii)	CILCORP	By-Laws of CILCORP as amended May 20, 2003	June 30, 2003, CILCORP Form 10-Q, Exhibit 3.1, File No. 2-95569
3.15(ii)	Ameren CILCO	By-Laws of CILCO as amended October 8, 2004	October 14, 2004, Combined Ameren Companies, Form 8-K, Exhibit 3.2*
3.16(ii)	Ameren IP	By-Laws of IP as amended October 8, 2004	October 14, 2004, Combined Ameren Companies and IP Form 8-K, Exhibit 3.3, File No. 1-3004*

178

Exhibit Designation	Registrant(s)	Nature of Exhibit	Previously Filed as Exhibit to:
Instruments Defining Rights of Security Holders
4.1	Ameren	Agreement, dated as of October 9, 1998, between Ameren and EquiServe Trust Company, N.A. (as successor to First Chicago Trust Company of New York), as Rights Agent, which includes the form of Certificate of Designation of the Preferred Shares as Exhibit A, the form of Rights Certificate as Exhibit B and the Summary of Rights as Exhibit C	October 14, 1998, Form 8-K, Exhibit 4, File No. 1-3672
4.2	Ameren	Indenture of Ameren with The Bank of New York, as Trustee, relating to senior debt securities dated as of December 1, 2001 (Ameren’s Senior Indenture)	Exhibit 4.5, File No. 333-81774
4.3	Ameren	Ameren Company Order relating to $100 million 5.70% Notes due February 1, 2007, issued under Ameren’s Senior Indenture	Exhibit 4.7, File No. 333-81774
4.4	Ameren	Ameren Company Order relating to $345 million Notes due May 15, 2007, issued under Ameren’s Senior Indenture	Exhibit 4.8, File No. 333-81774
4.5	Ameren	Purchase Contract Agreement dated as of March 1, 2002, between Ameren and The Bank of New York, as purchase contract agent, relating to the 13,800,000 9.75% Adjustable Conversion-Rate Equity Security Units (Equity Security Units)	Exhibit 4.15, File No. 333-81774
4.6	Ameren	Pledge Agreement dated as of March 1, 2002, among Ameren, The Bank of New York, as purchase contract agent and BNY Trust Company of Missouri, as collateral agent, custodial agent and securities intermediary, relating to the Equity Security Units	Exhibit No. 4.16, File No. 333-81774
4.7	Ameren UE	Indenture of Mortgage and Deed of Trust dated June 15, 1937 (UE Mortgage), as amended May 1, 1941, and Second Supplemental Indenture dated May 1, 1941	Exhibit B-1, File No. 2-4940
4.8	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of April 1, 1971	April 1971 UE Form 8-K, Exhibit No. 6, File No. 1-2967
4.9	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of February 1, 1974	February 1974 UE Form 8-K, , Exhibit No. 3, File No. 1-2967
4.10	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of July 7, 1980	Exhibit No. 4.6, File No. 2-69821
4.11	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of December 1, 1991	Exhibit No. 4.4, File No. 33-45008
4.12	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of December 4, 1991	Exhibit No. 4.5, File No. 33-45008
4.13	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of January 1, 1992	UE 1991 Form 10-K, Exhibit 4.6, File No. 1-2967
4.14	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of October 1, 1992	UE 1992 Form 10-K, Exhibit 4.6, File No. 1-2967
4.15	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of December 1, 1992	UE 1992 Form 10-K, Exhibit 4.7, File No. 1-2967
4.16	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of February 1, 1993	UE 1992 Form 10-K, Exhibit 4.8, File No. 1-2967
4.17	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of May 1, 1993	UE 1993 Form 10-K, Exhibit 4.6, File No. 1-2967
4.18	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of August 1, 1993	UE 1993 Form 10-K, Exhibit 4.7, File No. 1-2967
4.19	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of October 1, 1993	UE 1993 Form 10-K, Exhibit 4.8, File No. 1-2967
4.20	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of January 1, 1994	UE 1993 Form 10-K, Exhibit 4.9, File No. 1-2967
4.21	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of February 1, 2000	UE 2000 Form 10-K, Exhibit 4.1, File No. 1-2967
4.22	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of August 15, 2002	August 22, 2002 UE Form 8-K, Exhibit 4.3, File No. 1-2967
4.23	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of March 5, 2003	March 10, 2003 UE Form 8-K, Exhibit 4.4, File No. 1-2967
4.24	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of April 1, 2003	April 9, 2003 UE Form 8-K, Exhibit 4.4, File No. 1-2967
4.25	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of July 15, 2003	July 28, 2003 UE Form 8-K, Exhibit 4.4, File No. 1-2967

179

Exhibit Designation	Registrant(s)	Nature of Exhibit	Previously Filed as Exhibit to:
4.26	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of October 1, 2003	October 7, 2003, UE Form 8-K, Exhibit 4.4, File No. 1-2967
4.27	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of February 1, 2004	March 31, 2004, Form 10-Q Combined Ameren Companies, Exhibit 4.1*
4.28	Ameren UE	Supplemental Indenture dated as of February 1, 2004, to the UE Mortgage relative to Series 2004B (1998B) Bonds	March 31, 2004, Form 10-Q Combined Ameren Companies, Exhibit 4.2*
4.29	Ameren UE	Supplemental Indenture dated as of February 1, 2004, to the UE Mortgage relative to Series 2004C (1998C) Bonds	March 31, 2004, Form 10-Q Combined Ameren Companies, Exhibit 4.3*
4.30	Ameren UE	Supplemental Indenture dated as of February 1, 2004, to the UE Mortgage relative to Series 2004D (2000B) Bonds	March 31, 2004, Form 10-Q Combined Ameren Companies, Exhibit 4.4*
4.31	Ameren UE	Supplemental Indenture dated as of February 1, 2004, to the UE Mortgage relative to Series 2004E (2000A) Bonds	March 31, 2004, Form 10-Q Combined Ameren Companies, Exhibit 4.5*
4.32	Ameren UE	Supplemental Indenture dated as of February 1, 2004, to the UE Mortgage relative to Series 2004F (2000C) Bonds	March 31, 2004, Form 10-Q Combined Ameren Companies, Exhibit 4.6*
4.33	Ameren UE	Supplemental Indenture dated as of February 1, 2004, to the UE Mortgage relative to Series 2004G (1991) Bonds	March 31, 2004, Form 10-Q Combined Ameren Companies, Exhibit 4.7*
4.34	Ameren UE	Supplemental Indenture dated as of February 1, 2004, to the UE Mortgage relative to Series 2004A (1992) Bonds	March 31, 2004, Form 10-Q Combined Ameren Companies, Exhibit 4.8*
4.35	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of May 1, 2004	May 18, 2004, Ameren Combined Companies Form 8-K, Exhibit 4.4*
4.36	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of September 1, 2004	September 23, 2004, Combined Ameren Companies Form 8-K, Exhibit 4.4*
4.37	Ameren UE	Supplemental Indenture to the UE Mortgage dated as of January 1, 2005	January 27, 2005, Ameren and UE Form 8-K, Exhibit 4.4, File No. 1-14756 and 1-2967
4.38	Ameren UE	Loan Agreement dated as of December 1, 1991, between the Missouri Environmental Authority and UE, together with Indenture of Trust dated as of December 1, 1991, between the Missouri Environmental Authority and UMB Bank N.A. as successor trustee to Mercantile Bank of St. Louis, N. A.	UE 1992 Form 10-K, Exhibit 4.37, File No. 1-2967
4.39	Ameren UE	First Amendment dated as of February 1, 2004, to Loan Agreement dated as of December 1, 1991, between the Missouri Environmental Authority and UE	March 31, 2004 Form 10-Q Combined Ameren Companies, Exhibit 4.9*
4.40	Ameren UE	Loan Agreement dated as of December 1, 1992, between the Missouri Environmental Authority and UE, together with Indenture of Trust dated as of December 1, 1992 between the Missouri Environmental Authority and UMB Bank, N.A. as successor trustee to Mercantile Bank of St. Louis, N. A.	UE 1992 Form 10-K, Exhibit 4.38, File No. 1-2967
4.41	Ameren UE	First Amendment dated as of February 1, 2004, to Loan Agreement dated as of December 1, 1992, between the Missouri Environmental Authority and UE	March 31, 2004, Form 10-Q Combined Ameren Companies, Exhibit 4.10*
4.42	Ameren UE	Series 1998A Loan Agreement dated as of September 1, 1998, between the Missouri Environmental Authority and UE	September 30, 1998, UE Form 10-Q, Exhibit 4.28, File No. 1-2967
4.43	Ameren UE	First Amendment dated as of February 1, 2004, to Series 1998A Loan Agreement dated as of September 1, 1998, between the Missouri Environmental Authority and UE	March 31, 2004, Form 10-Q Combined Ameren Companies, Exhibit 4.11*
4.44	Ameren UE	Series 1998B Loan Agreement dated as of September 1, 1998, between the Missouri Environmental Authority and UE	September 30, 1998, UE Form 10-Q, Exhibit 4.29, File No. 1-2967
4.45	Ameren UE	First Amendment dated as of February 1, 2004, to Series 1998B Loan Agreement dated as of September 1, 1998, between the Missouri Environmental Authority and UE	March 31, 2004, Form 10-Q Combined Ameren Companies, Exhibit 4.12*
4.46	Ameren UE	Series 1998C Loan Agreement dated as of September 1, 1998, between the Missouri Environmental Authority and UE	September 30, 1998, UE Form 10-Q, Exhibit 4.30, File No. 1-2967

180

Exhibit Designation	Registrant(s)	Nature of Exhibit	Previously Filed as Exhibit to:
4.47	Ameren UE	First Amendment dated as of February 1, 2004, to Series 1998C Loan Agreement dated as of September 1, 1998, between the Missouri Environmental Authority and UE	March 31, 2004, Form 10-Q Combined Ameren Companies, Exhibit 4.13*
4.48	Ameren UE	Indenture dated as of August 15, 2002, from UE to The Bank of New York, as Trustee, relating to senior secured debt securities (including the forms of senior secured debt securities as exhibits)	August 23, 2002, UE Form 8-K, Exhibit 4.1, File No. 1-2967
4.49	Ameren UE	UE Company Order dated August 22, 2002, establishing the 5.25% Senior Secured Notes due 2012	August 22, 2002, UE Form 8-K, Exhibit 4.2, File No. 1-2967
4.50	Ameren UE	UE Company Order dated March 10, 2003, establishing the 5.50% Senior Secured Notes due 2034	March 10, 2003, UE Form 8-K, Exhibit 4.2, File No. 1-2967
4.51	Ameren UE	UE Company Order dated April 9, 2003, establishing the 4.75% Senior Secured Notes due 2015	April 9, 2003, UE Form 8-K, Exhibit 4.2, File No. 1-2967
4.52	Ameren UE	UE Company Order dated July 28, 2003, establishing the 5.10% Senior Secured Notes due 2018	July 28, 2003, UE Form 8-K, Exhibit 4.2, File No. 1-2967
4.53	Ameren UE	UE Company Order dated October 7, 2003, establishing the 4.65% Senior Secured Notes due 2013	October 7, 2003, UE Form 8-K, Exhibit 4.2, File No. 1-2967
4.54	Ameren UE	UE Company Order dated May 13, 2004, establishing the 5.50% Senior Secured Notes due 2014	May 18, 2004, Combined Ameren Companies Form 8-K, Exhibit 4.2*
4.55	Ameren UE	UE Company Order dated September 1, 2004, establishing the 5.10% Senior Secured Notes due 2019	September 23, 2004, Combined Ameren Companies Form 8-K, Exhibit 4.2*
4.56	Ameren UE	UE Company Order dated January 27, 2005, establishing the 5.00 % Senior Secured Notes due 2020	January 27, 2005, Ameren and UE Form 8-K, Exhibit 4.2, File No. 1-14756 and 1-2967
4.57	Ameren CIPS	Indenture of Mortgage or Deed of Trust dated October 1, 1941, from CIPS to Continental Illinois National Bank and Trust Company of Chicago and Edmond B. Stofft, as Trustees (U.S. Bank Trust National Association and Patrick J. Crowley are successor Trustees) (CIPS Mortgage)	Exhibit 2.01, File No. 2-60232
4.58	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated September 1, 1947	Amended Exhibit 7(b), File No. 2-7341
4.59	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated January 1, 1949	Second Amended Exhibit 7.03, File No. 2-7795
4.60	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated February 1, 1952	Second Amended Exhibit 4.07, File No. 2-9353
4.61	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated September 1, 1952	Amended Exhibit 4.05, File No. 2-9802
4.62	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated June 1, 1954	Amended Exhibit 4.02, File No. 2-10944
4.63	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated February 1, 1958	Amended Exhibit 2.02, File No. 2-13866
4.64	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated January 1, 1959	Amended Exhibit 2.02, File No. 2-14656
4.65	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated May 1, 1963	Amended Exhibit 2.02, File No. 2-21345
4.66	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated May 1, 1964	Amended Exhibit 2.02, File No. 2-22326
4.67	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated June 1, 1965	Amended Exhibit 2.02, File No. 2-23569
4.68	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated May 1, 1967	Amended Exhibit 2.02, File No. 2-26284
4.69	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated April 1, 1970	Amended Exhibit 2.02, File No. 2-36388
4.70	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated April 1, 1971	Amended Exhibit 2.02, File No. 2-39587
4.71	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated September 1, 1971	Amended Exhibit 2.02, File No. 2-41468
4.72	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated May 1, 1972	Amended Exhibit 2.02, File No. 2-43912
4.73	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated December 1, 1973	Exhibit 2.03, File No. 2-60232
4.74	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated March 1, 1974	Amended Exhibit 2.02, File No. 2-50146
4.75	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated April 1, 1975	Amended Exhibit 2.02, File No. 2-52886

181

Exhibit Designation	Registrant(s)	Nature of Exhibit	Previously Filed as Exhibit to:
4.76	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated October 1, 1976	Second Amended Exhibit 2.04, File No. 2-57141
4.77	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated November 1,1976	Amended Exhibit 2.04, File No. 2-57557
4.78	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated October 1, 1978	Amended Exhibit 2.06, File No. 2-62564
4.79	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated August 1, 1979	Exhibit 2.02(a), File No. 2-65914
4.80	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated February 1, 1980	Exhibit 2.02(a), File No. 2-66380
4.81	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated February 1, 1986	Amended Exhibit 4.02, File No. 33-3188
4.82	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated May 15, 1992	May 15, 1992, CIPS Form 8-K, Exhibit 4.02, File No. 1-3672
4.83	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated July 1, 1992	July 1, 1992, CIPS Form 8-K, Exhibit 4.02, File No. 1-3672
4.84	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated September 15, 1992	September 15, 1992, CIPS Form 8-K, Exhibit 4.02, File No. 1-3672
4.85	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated April 1, 1993	March 30, 1993, CIPS Form 8-K, Exhibit 4.02, File No. 1-3672
4.86	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated June 1, 1995	June 5, 1995, CIPS Form 8-K, Exhibit 4.03, File No. 1-3672
4.87	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated March 15, 1997	March 15, 1997, CIPS Form 8-K, Exhibit 4.03, File No. 1-3672
4.88	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated June 1, 1997	June 1, 1997, CIPS Form 8-K, Exhibit 4.03, File No. 1-3672
4.89	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated December 1, 1998	Exhibit 4.2, File No. 333-59438
4.90	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated June 1, 2001	June 30, 2001, CIPS Form 10-Q, Exhibit 4.1, File No. 1-3672
4.91	Ameren CIPS	Supplemental Indenture to the CIPS Mortgage, dated October 1, 2004
4.92	Ameren CIPS	Indenture dated as of December 1, 1998, from CIPS to The Bank of New York, as trustee, relating to CIPS’ Senior Notes, 5.375% due 2008 and 6.125% due 2028	Exhibit 4.4, File No. 333-59438
4.93	Ameren Genco	Indenture dated as of November 1, 2000, from Genco to The Bank of New York, as trustee, relating to the issuance of senior notes (Genco Indenture)	Exhibit 4.1, File No. 333-56594
4.94	Ameren Genco	First Supplemental Indenture dated as of November 1, 2000, to Genco Indenture, relating to Genco’s 7.75% Senior Notes, Series A due 2005 and 8.35% Senior Notes, Series B due 2010	Exhibit 4.2, File No. 333-56594
4.95	Ameren Genco	Form of Second Supplemental Indenture dated as of June 12, 2001, to Genco Indenture, relating to Genco’s 7.75% Senior Notes, Series C due 2005 and 8.35% Senior Note, Series D due 2010 (including as exhibit the form of Exchange Note)	Exhibit 4.3, File No. 333-56594
4.96	Ameren Genco	Third Supplemental Indenture dated as of June 1, 2002, to Genco Indenture, relating to Genco’s 7.95% Senior Notes, Series E due 2032 (including as exhibit the form of Note)	June 30, 2002, Genco Form 10-Q, Exhibit 4.1, File No. 333-56594
4.97	Ameren Genco	Fourth Supplemental Indenture dated as of January 15, 2003, to Genco Indenture, relating to Genco 7.95% Senior Notes, Series F due 2032 (including as exhibit the form of Exchange Note)	Genco 2002 Form 10-K, Exhibit 4.5, File No. 333-56594
4.98	Ameren CILCORP	Indenture, dated as of October 18, 1999, between Midwest Energy, Inc. and The Bank of New York, as Trustee, and First Supplemental Indenture, dated as of October 18, 1999, between CILCORP and The Bank of New York	Exhibits 4.1 and 4.2, File No. 333-90373

182

Exhibit Designation	Registrant(s)	Nature of Exhibit	Previously Filed as Exhibit to:
4.99	Ameren CILCO	Indenture of Mortgage and Deed of Trust between Illinois Power Company and Bankers Trust Company, as trustee, dated as of April 1, 1933 (CILCO Mortgage), Supplemental Indenture between the same parties dated as of June 30, 1933, Supplemental Indenture between CILCO and Bankers Trust Company, as trustee, dated as of July 1, 1933 and Supplemental Indenture between the same parties dated as of January 1, 1935, securing First Mortgage Bonds.	Designated in Registration No. 2-1937 as Exhibit B-1, in Registration No. 2-2093 as Exhibit B-1(a), in Form 8-K for April 1940.
4.100	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated December 1, 1949	December 1949 CILCO 8-K, Exhibit A, File No. 1-2732
4.101	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated December 1, 1951	December 1951 CILCO 8-K, Exhibit A, File No. 1-2732
4.102	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated July 1, 1957	July 1957 CILCO 8-K, Exhibit A, File No. 1-2732
4.103	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated July 1, 1958	July 1958 CILCO 8-K, Exhibit A, File No. 1-2732
4.104	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated March 1, 1960	March 1960 CILCO 8-K, Exhibit A, File No. 1-2732
4.105	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated September 20, 1961	September 1961 CILCO 8-K, Exhibit A, File No. 1-2732
4.106	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated March 1, 1963	March 1963 CILCO 8-K, Exhibit B, File No. 1-2732
4.107	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated February 1, 1966	February 1966 CILCO 8-K, Exhibit A, File No. 1-2732
4.108	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated March 1, 1967	March 1967 CILCO 8-K, Exhibit A, File No. 1-2732
4.109	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated August 1, 1970	August 1970 CILCO 8-K, Exhibit A, File No. 1-2732
4.110	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated September 1, 1971	September 1971 CILCO 8-K, Exhibit A, File No. 1-2732
4.111	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated September 20, 1972	September 1972 CILCO 8-K, Exhibit A, File No. 1-2732
4.112	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated April 1, 1974	April 1974 CILCO 8-K, Exhibit A, File No. 1-2732
4.113	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated June 1, 1974	June 1974 CILCO 8-K, Exhibit 2(b), File No. 1-2732
4.114	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated March 1, 1975	March 1975 CILCO 8-K, Exhibit A, File No. 1-2732
4.115	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated May 1, 1976	May 1976 CILCO 8-K, Exhibit A, File No. 1-2732
4.116	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated May 16, 1978	June 30, 1978, CILCO 10-Q, Exhibit A, File No. 1-2732
4.117	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated September 1, 1982	CILCO 1982, Form 10-K, Exhibit 2, File No. 1-2732
4.118	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated January 15, 1992	January 30, 1982, CILCO 8-K, Exhibit (4)(b), File No. 1-2732
4.119	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated January 1, 1993	January 29, 1993, CILCO 8-K, Exhibit (4), File No. 1-2732
4.120	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated November 1, 1994	December 2, 1994, CILCO 8-K, Exhibit 4, File No. 1-2732
4.121	Ameren CILCO	Supplemental Indenture to the CILCO Mortgage, dated October 1, 2004
4.122	Ameren IP	General Mortgage Indenture and Deed of Trust dated as of November 1, 1992 (IP Mortgage)	IP 1992 Form 10-K, Exhibit 4(cc), File No. 1-3004
4.123	Ameren IP	Supplemental Indenture No. 2 dated March 15, 1993, to IP Mortgage for the 6 ¾% bonds due 2005	IP 1992 Form 10-K Exhibit 4(ii), File No. 1-3004
4.124	Ameren IP	Supplemental Indenture dated July 15, 1993, to IP Mortgage for the 7 ½% bonds due 2025	June 30, 1993, IP Form 10-Q, Exhibit 4(kk), File No. 1-3004
4.125	Ameren IP	Supplemental Indenture dated August 1, 1993, to IP Mortgage for the 6 ½ bonds due 2003	June 30, 1993, IP Form 10-Q, Exhibit 4(mm), File No. 1-3004
4.126	Ameren IP	Supplemental Indenture dated April 1, 1997, to IP Mortgage for the series P, Q and R bonds	March 31, 1997, IP Form 10-Q, Exhibit 4(b), File No. 1-3004
4.127	Ameren IP	Supplemental Indenture dated as of March 1, 1998, to IP Mortgage for the series S bonds	January 22, 1999, IP Registration Statement Form S-3, Exhibit 4.41 Registration No. 333-71061

183

Exhibit Designation	Registrant(s)	Nature of Exhibit	Previously Filed as Exhibit to:
4.128	Ameren IP	Supplemental Indenture dated as of March 1, 1998, to IP Mortgage for the series T bonds	January 22, 1999, IP Registration Statement Form S-3, Exhibit 4.42 Registration No. 333-71061
4.129	Ameren IP	Supplemental Indenture dated as of September 15, 1998, to IP Mortgage for the 6% bonds due 2003	January 22, 1999, IP Registration Statement Form S-3, Exhibit 4.46 Registration No. 333-71061
4.130	Ameren IP	Supplemental Indenture dated as of June 15, 1999, to IP Mortgage for the 7.5% bonds due 2009	June 30, 1999, IP Form 10-Q, Exhibit 4.2, File No. 1-3004
4.131	Ameren IP	Supplemental Indenture dated as of July 15, 1999, to IP Mortgage for the series U bonds	June 30, 1999, IP Form 10-Q, Exhibit 4.4, File No. 1-3004
4.132	Ameren IP	Supplemental Indenture dated as of July 15, 1999, to IP Mortgage for the series V bonds	June 30, 1999, IP Form 10-Q, Exhibit 4.6, File No. 1-3004
4.133	Ameren IP	Supplemental Indenture No. 1 dated as of May 1, 2001 to IP Mortgage for the series W bonds	2001 IP Form 10-K, Exhibit 4.19, File No. 1-3004
4.134	Ameren IP	Supplemental Indenture No. 2 dated as of May 1, 2001, to IP Mortgage for the series X bonds	2001 IP Form 10-K, Exhibit 4.20, File No. 1-3004
4.135	Ameren IP	Supplemental Indenture dated as of December 15, 2002, to IP Mortgage for the 11 ½% bonds due 2010	December 23, 2002, IP Form 8-K, Exhibit 4.1, File No. 1-3004
Material Contracts
10.1	Ameren Companies IP	**Ameren’s Long-term Incentive Plan of 1998	Ameren 1998 Form 10-K, Exhibit 10.1, File No. 1-14756
10.2	Ameren Companies IP	**Ameren’s Change of Control Severance Plan	Ameren 1998 Form 10-K, Exhibit 10.2, File No. 1-14756
10.3	Ameren IP	**Ameren’s Deferred Compensation Plan for Members of the Board of Directors	Ameren 1998 Form 10-K, Exhibit 10.4, File No. 1-14756
10.4	Ameren Companies IP	**Ameren’s Deferred Compensation Plan for Members of the Ameren Leadership Team as amended and restated effective January 1, 2001	Ameren 2000 Form 10-K, Exhibit 10.1, File No. 1-14756
10.5	Ameren Companies IP	**Ameren’s Executive Incentive Compensation Program Elective Deferral Provisions for Members of the Ameren Leadership Team as amended and restated effective January 1, 2001	Ameren 2000 Form 10-K, Exhibit 10.2, File No. 1-14756
10.6	Ameren Companies	**2003 Ameren Executive Incentive Plan	March 31, 2003, Ameren Form 10-Q, Exhibit 10.1, File No. 1-14756
10.7	Ameren Companies	**2004 Ameren Executive Incentive Plan	2003 Combined Ameren Companies Form 10-K, Exhibit 10.7*
10.8	Ameren Companies IP	**2005 Ameren Executive Incentive Plan	February 11, 2005, Combined Ameren Companies and IP Form 8-K, Exhibit 10.2, File No. 1-3004*
10.9	Ameren CIPS Genco	Asset Transfer Agreement between Genco and CIPS	June 30, 2000, CIPS Form 10-Q, Exhibit 10, File No.1-3672
10.10	Ameren CIPS Genco	Amended Electric Power Supply Agreement between Genco and Marketing Company	Exhibit 10.2, File No. 333-56594
10.11	Ameren CIPS Genco	Second Amended Electric Power Supply Agreement between Genco and Marketing Company	March 31, 2001, Ameren Form 10-Q, Exhibit 10.1, File No. 1-14756
10.12	Ameren CIPS Genco	Electric Power Supply Agreement between Marketing Company and CIPS	Exhibit 10.3, File No. 333-56594
10.13	Ameren CIPS Genco	Amended Electric Power Supply Agreement between Marketing Company and CIPS	March 31, 2001, Ameren Form 10-Q, Exhibit 10.2, File No. 1-14756
10.14	Ameren UE Genco	Power Sales Agreement between Marketing Company and UE	September 30, 2001, UE Form 10-Q, Exhibit 10.1, File No. 1-2967
10.15	Ameren UE Genco	Power Sales Agreement between Marketing Company and UE	March 31, 2002, UE Form 10-Q, Exhibit 10.1, File No. 1-2967
10.16	Ameren UE CIPS Genco	Amended Joint dispatch Agreement among Genco, CIPS and UE	Exhibit 10.4, File No. 333-56594
10.17	Ameren UE	Lease Agreement dated as of December 1, 2002, between the city of Bowling Green, Missouri, as lessor and UE, as lessee	UE 2002 Form 10-K, Exhibit 10.9, File No. 1-2967

184

Exhibit Designation	Registrant(s)	Nature of Exhibit	Previously Filed as Exhibit to:
10.18	Ameren UE	Trust Indenture dated as of December 1, 2002, between the city of Bowling Green, Missouri and Commerce Bank N.A. as trustee	UE 2002 Form 10-K, Exhibit 10.10, File No. 1-2967
10.19	Ameren UE	Bond Purchase Agreement dated as of December 20, 2002, between the city of Bowling Green, Missouri and UE as purchaser	UE 2002 Form 10-K, Exhibit 10.11, File No. 1-2967
10.20	Ameren UE CIPS Genco	Amended and Restated Appendix I ITC Agreement dated February 14, 2003, between the MISO and GridAmerica LLC (Grid America)	Ameren 2002 Form 10-K, Exhibit 10.17, File No. 1-14756
10.21	Ameren UE CIPS Genco	Amended and Restated Limited Liability Company Agreement of GridAmerica dated February 14, 2003	Ameren 2002 Form 10-K, Exhibit 10-18, File No. 1-14756
10.22	Ameren UE CIPS Genco	Amended and Restated Master Agreement by and among GridAmerica, GridAmerica Holdings, Inc., GridAmerica Companies and National Grid USA dated February 14, 2003	Ameren 2002 Form 10-K, Exhibit 10.19, File No. 1-14756
10.23	Ameren UE CIPS Genco	Amended and Restated Operation Agreement by and among UE, CIPS, American Transmission Systems, Inc., Northern Indiana Public Service Company, and GridAmerica dated February 14, 2003	Ameren 2002 Form 10-K, Exhibit 10.20, File No. 1-14756
10.24	Ameren CILCORP CILCO	**CILCO Executive Deferral Plan as amended effective August 15, 1999	CILCORP 1999 Form 10-K, Exhibit 10
10.25	Ameren CILCORP CILCO	**CILCO Executive Deferral Plan II as amended effective April 1, 1999	CILCORP 1999 Form 10-K, Exhibit 10a
10.26	Ameren CILCORP CILCO	**CILCO Benefit Replacement Plan as amended effective August 15, 1999	CILCORP 1999 Form 10-K, Exhibit 10b
10.27	Ameren CILCORP CILCO	**Retention Agreement between CILCO and Scott A. Cisel dated October 16, 2001	CILCORP 2001 Form 10-K, Exhibit 10c
10.28	Ameren CILCORP CILCO	**CILCO Involuntary Severance Pay Plan effective July 16, 2001	CILCORP 2001 Form 10-K, Exhibit 10e
10.29	Ameren CILCORP CILCO	**CILCO Restructured Executive Deferral Plan (approved August 15, 1999)	CILCORP 1999 Form 10-K, Exhibit 10e
10.30	Ameren CILCORP CILCO	Contribution Agreement between CILCO and AERG	September 30, 2003, Combined Ameren Companies Form 10-Q, Exhibit 10.1*
10.31	Ameren CILCORP CILCO	Power Supply Agreement between AERG and CILCO	September 30, 2003, Combined Ameren Companies Form 10-Q, Exhibit 10.2*
10.32	Ameren Companies	Three-Year Revolving Credit Agreement, dated as of July 14, 2004	June 30, 2004, Combined Ameren Companies Form 10-Q, Exhibit 10.1*
10.33	Ameren Companies	Five-Year Revolving Credit Agreement, dated as of July 14, 2004	June 30, 2004, Combined Ameren Companies Form 10-Q, Exhibit 10.2*
10.34	Ameren CILCORP CILCO	Extension of Power Supply Agreement between AERG and CILCO	June 30, 2004, Combined Ameren Companies Form 10-Q, Exhibit 10.3*
10.35	Ameren Companies IP	Amended and Restated Three-Year Revolving Credit Agreement, dated as of September 21, 2004	September 21, 2004, Combined Ameren Companies Form 8-K, Exhibit 10.1*
10.36	Ameren Companies	Separation and Release Agreement of Garry L. Randolph	September 24, 2004, Combined Ameren Companies Form 8-K, Exhibit 10.1*
10.37	Ameren Companies IP	Third Amended Ameren Corporation System Utility Money Pool Agreement	October 1, 2004, Combined Ameren Companies and IP Form 8-K, Exhibit 10.2, File No. 1-3004*
10.38	Ameren IP	Power Purchase Agreement by and between IP and Dynegy Power Marketing, dated as of September 30, 2004	October 1, 2004, Combined Ameren Companies and IP Form 8-K, Exhibit 10.1, File No. 1-3004*

185

Exhibit Designation	Registrant(s)	Nature of Exhibit	Previously Filed as Exhibit to:
10.39	Ameren IP	Unilateral Borrowing Agreement by and among Ameren, IP and Ameren Services, dated as of September 30, 2004	October 1, 2004, Combined Ameren Companies and IP Form 8-K, Exhibit 10.3, File No. 3004*
10.40	IP	**Group Insurance Benefits for IP Managerial Employees, as amended and restated effective January 1, 1983	1983 IP Form 10-K, Exhibit 10(a), File No. 1-3004
10.41	IP	**IP Retirement Income Plan for Salaried Employees, as amended and restated effective January 1, 1989, as further amended through January 1, 1994	1994 IP Form 10-K, Exhibit 10(m), File No. 1-3004
10.42	IP	**IP Retirement Income Plan for Employees Covered Under a Collective Bargaining Agreement, as amended and restated effective as of January 1, 1994	1994 IP Form 10-K, Exhibit 10(n), File No. 1-3004
10.43	IP	**IP Incentive Savings Plan, as amended and restated effective January 1, 2002	Dynegy Inc. Form S-8 Registration Statement, Exhibit 10.3, Registration No. 333-76570
10.44	IP	**First amendment to IP Incentive Savings Plan for Employees Covered Under a Collective Bargaining Agreement Trust Agreement, effective October 1, 2003	2003 IP Form 10-K, Exhibit 10.5, File No. 1-3004
10.45	IP	**IP Incentive Savings Plan Trust Agreement	Dynegy Inc. Registration Statement on Form S-8, Exhibit 10.4, Registration No. 333-76570
10.46	IP	**IP Incentive Savings Plan for Employees Covered Under a Collective Bargaining Agreement, as amended and restated effective January 1, 2002	Dynegy Inc. Registration Statement on Form S-8, Exhibit 10.5, Registration No. 333-76570
10.47	IP	**IP Incentive Savings Plan for Employees Covered Under a Collective Bargaining Agreement Trust Agreement	Dynegy Inc. Registration Statement on Form S-8, Exhibit 10.6, Registration No. 333-76570
10.48	IP	**IP Supplemental Retirement Income Plan for Salaried Employees, as amended by resolutions adopted by the board of directors on June 10-11,1997	1997 IP Form 10-K, Exhibit 10(b)(13), File No. 1-3004
10.49	IP	Registration Rights Agreement dated as of December 20, 2002, among IP and the initial purchasers of the 11 ½% mortgage bonds due 2010	December 23 2002, IP Form 8-K, Exhibit 4.2, File No. 1-3004
10.50	IP	**Severance Agreement and Release dated as of January 27, 2004, among Larry F. Altenbaumer, Dynegy Inc., and Illinois Power Company	2003 IP Form 10-K, Exhibit 10.12, File No. 1-3004
10.51	IP	**Contract for Services dated as of January 27, 2004, between Larry F. Altenbaumer and Illinois Power Company	2003 IP Form 10-K, Exhibit 10.13, File No. 1-3004
10.52	IP	**Letter Agreement dated as of March 6, 2003, between Dynegy Inc. and Shawn E. Schukar	2003 IP Form 10-K, Exhibit 10.14 File No. 1-3004
10.53	Ameren	Escrow Agreement among Illinova Corporation, Ameren and JP Morgan Chase Bank as escrow agent, dated as of September 30, 2004	September 30, 2004, Combined Ameren Companies Form 10-Q, Exhibit 10.1*
10.54	Ameren CIPS Genco	Power Supply Agreement between CIPS and Marketing Company, as amended November 5, 2004	September 30, 2004, Combined Ameren Companies Form 10-Q, Exhibit 10.2*
10.55	Ameren Companies IP	**Form of Restricted Stock Award	February 11, 2005, Combined Ameren Companies and IP Form 8.K, Exhibit 10.1, File No. 1 - 3004*
Statement re: Computation of Ratios
12.1	Ameren	Ameren’s Statement of Computation of Ratio of Earnings to Fixed Charges
12.2	Ameren UE	UE’s Statement of Computation of Ratio of Earnings to Fixed Charges and Preferred Stock Dividend Requirements
12.3	Ameren CIPS	CIPS’ Statement of Computation of Ratio of Earnings to Fixed Charges and Preferred Stock Dividend Requirements
12.4	Ameren Genco	Genco’s Statement of Computation of Ratio of Earnings to Fixed Charges
12.5	Ameren CILCORP	CILCORP’s Statement of Computation of Ratio of Earnings to Fixed Charges
12.6	Ameren CILCO	CILCO’s Statement of Computation of Ratio of Earnings to Fixed Charges and Preferred Stock Dividend Requirements

186

Exhibit Designation	Registrant(s)	Nature of Exhibit	Previously Filed as Exhibit to:
12.7	Ameren IP	IP’s Statement of Computation of Ratio of Earnings to Fixed Charges and Preferred Stock Dividend Requirements
Code of Ethics
14.1	Ameren Companies IP	Code of Ethics amended as of June 11, 2004	June 30, 2004, Combined Ameren Companies Form 10-Q, Exhibit 14.1*
Subsidiaries of the Registrant
21.1	Ameren Companies IP	Subsidiaries of Ameren
Consent of Experts and Counsel
23.1	Ameren	Consent of Independent Registered Public Accounting Firm with respect to Ameren
23.2	UE	Consent of Independent Registered Public Accounting Firm with respect to UE
23.3	CIPS	Consent of Independent Registered Public Accounting Firm with respect to CIPS
Power of Attorney
24.1	Ameren	Power of Attorney with respect to Ameren
24.2	UE	Power of Attorney with respect to UE
24.3	CIPS	Power of Attorney with respect to CIPS
24.4	Genco	Power of Attorney with respect to Genco
24.5	CILCORP	Power of Attorney with respect to CILCORP
24.6	CILCO	Power of Attorney with respect to CILCO
24.7	IP	Power of Attorney with respect to IP
Rule 13a-14(a)/15d-14(a) Certifications
31.1	Ameren	Rule13a-14(a)/15d-14(a) Certification of Principal Executive Officer of Ameren
31.2	Ameren	Rule 13a-14(a)/15d-14(a) Certification of Principal Financial Officer of Ameren
31.3	UE	Rule 13a-14(a)/15d-14(a) Certification of Principal Executive Officer of UE
31.4	UE	Rule 13a-14(a)/15d-14(a) Certification of Principal Financial Officer of UE
31.5	CIPS	Rule 13a-14(a)/15d-14(a) Certification of Principal Executive Officer of CIPS
31.6	CIPS	Rule 13a-14(a)/15d-14(a) Certification of Principal Financial Officer of CIPS
31.7	Genco	Rule 13a-14(a)/15d-14(a) Certification of Principal Executive Officer of Genco
31.8	Genco	Rule 13a-14(a)/15d-14(a) Certification of Principal Financial Officer of Genco
31.9	CILCORP	Rule 13a-14(a)/15d-14(a) Certification of Principal Executive Officer of CILCORP
31.10	CILCORP	Rule13a-14(a)/15d-14(a) Certification of Principal Financial Officer of CILCORP
31.11	CILCO	Rule 13a-14(a)/15d-14(a) Certification of Principal Executive Officer of CILCO
31.12	CILCO	Rule 13a-14(a)/15d-14(a) Certification of Principal Financial Officer of CILCO
31.13	IP	Rule 13a-14(a)/15d-14(a) Certification of Principal Executive Officer of IP
31.14	IP	Rule 13a-14(a)/15d-14(a) Certification of Principal Financial Officer of IP
Section 1350 Certifications
32.1	Ameren	Section 1350 Certification of Principal Executive Officer of Ameren
32.2	Ameren	Section 1350 Certification of Principal Financial Officer of Ameren
32.3	UE	Section 1350 Certification of Principal Executive Officer of UE
32.4	UE	Section 1350 Certification of Principal Financial Officer of UE
32.5	CIPS	Section 1350 Certification of Principal Executive Officer of CIPS
32.6	CIPS	Section 1350 Certification of Principal Financial Officer of CIPS

187

Exhibit Designation	Registrant(s)	Nature of Exhibit	Previously Filed as Exhibit to:
32.7	Genco	Section 1350 Certification of Principal Executive Officer of Genco
32.8	Genco	Section 1350 Certification of Principal Financial Officer of Genco
32.9	CILCORP	Section 1350 Certification of Principal Executive Officer of CILCORP
32.10	CILCORP	Section 1350 Certification of Principal Financial Officer of CILCORP
32.11	CILCO	Section 1350 Certification of Principal Executive Officer of CILCO
32.12	CILCO	Section 1350 Certification of Principal Financial Officer of CILCO
32.13	IP	Section 1350 Certification of Principal Executive Officer of IP
32.14	IP	Section 1350 Certification of Principal Financial Officer of IP
Additional Exhibits
99.1	Ameren UE	Stipulation and Agreement dated July 15, 2002 in Missouri Public Service Commission Case No. EC-2002-1 (earnings complaint case against UE)	Exhibit 99.1, File Nos. 333-87506 and 333-87506-01

*The file number references for the Combined Ameren Companies’ filings with the SEC are: Ameren, 1-14756; UE, 1-2967; CIPS, 1-3672; Genco, 333-56594; CILCORP, 2-95569, and CILCO, 1-2732.

**Management compensatory plan or arrangement.

Each Registrant hereby undertakes to furnish to the SEC upon request a copy of any long-term debt instrument not listed above.

188

Commission File Number	Exact Name of Registrant as specified in its charter; State of Incorporation; Address and Telephone Number	IRS Employer Identification No.

1-14756	Ameren Corporation	43-1723446
	(Missouri Corporation)
	1901 Chouteau Avenue
	St. Louis, Missouri 63103
	(314) 621-3222

1-2967	Union Electric Company	43-0559760
	(Missouri Corporation)
	1901 Chouteau Avenue
	St. Louis, Missouri 63103
	(314) 621-3222

1-3672	Central Illinois Public Service Company	37-0211380
	(Illinois Corporation)
	607 East Adams Street
	Springfield, Illinois 62739
	(217) 523-3600

333-56594	Ameren Energy Generating Company	37-1395586
	(Illinois Corporation)
	1901 Chouteau Avenue
	St. Louis, Missouri 63103
	(314) 621-3222

2-95569	CILCORP Inc.	37-1169387
	(Illinois Corporation)
	300 Liberty Street
	Peoria, Illinois 61602
	(309) 677-5230

1-2732	Central Illinois Light Company	37-0211050
	(Illinois Corporation)
	300 Liberty Street
	Peoria, Illinois 61602
	(309) 677-5230

1-3004	Illinois Power Company	37-0344645
	(Illinois Corporation)
	500 S. 27th Street
	Decatur, Illinois 62521-2200
	(217) 424-6600

Registrant	Title of each class
Ameren Corporation	Common Stock, $0.01 par value per share and
	Preferred Share Purchase Rights; Normal Units
Union Electric Company	Preferred Stock, cumulative, no par value,
	Stated value $100 per share -
	$4.56 Series $4.50 Series
	$4.00 Series $3.50 Series
Central Illinois Light Company	Preferred stock, cumulative, $100 par value per share -
	4½% Series
Illinois Power Company	Mortgage Bonds -
	6¾% Series due 2005

Registrant	Title of each class
Central Illinois Public Service Company	Preferred Stock, cumulative, $100 par value per share -
	6.625% Series 4.90% Series
	5.16% Series 4.25% Series
	4.92% Series 4.00% Series
	Depository Shares, each representing one-fourth of a
	share of 6.625% Preferred Stock, cumulative,
	$100 par value per share

Ameren Corporation	(X)
Union Electric Company	(X)
Central Illinois Public Service Company	(X)
Ameren Energy Generating Company	(X)
CILCORP Inc.	(X)
Central Illinois Light Company	(X)
Illinois Power Company	(X)

Ameren Corporation	Yes	(X)	No	( )
Union Electric Company	Yes	( )	No	(X)
Central Illinois Public Service Company	Yes	( )	No	(X)
Ameren Energy Generating Company	Yes	( )	No	(X)
CILCORP Inc.	Yes	( )	No	(X)
Central Illinois Light Company	Yes	( )	No	(X)
Illinois Power Company	Yes	( )	No	(X)

Ameren Corporation	Common stock, $.01 par value per share - 195,304,639

Union Electric Company	Common stock, $5 par value per share, held by Ameren Corporation (parent company of the Registrant) - 102,123,834

Central Illinois Public Service Company	Common stock, no par value, held by Ameren Corporation (parent company of the Registrant) - 25,452,373

Ameren Energy Generating Company	Common stock, no par value, held by Ameren Energy Development Company (parent company of the Registrant and indirect subsidiary of Ameren Corporation) - 2,000

CILCORP Inc.	Common stock, no par value, held by Ameren Corporation (parent company of the Registrant) - 1,000

Central Illinois Light Company	Common stock, no par value, held by CILCORP Inc. (parent company of the Registrant and subsidiary of Ameren Corporation) - 13,563,871

Illinois Power Company	Common stock, no par value, held by Ameren Corporation (parent company of the Registrant) - 23,000,000

	Page
GLOSSARY OF TERMS AND ABBREVIATIONS	5

Forward-looking Statements	7

PART I
Item 1. Business
General	8
Rates and Regulation	8
Supply for Electric Power	10
Natural Gas Supply for Distribution	12
Industry Issues	12
Risk Factors	13
Operating Statistics	18
Available Information	19
Item 2. Properties	20
Item 3. Legal Proceedings	22
Item 4. Submission of Matters to a Vote of Security Holders	22

Executive Officers of the Registrants (Item 401(b) of Regulation S-K)	23

PART II
Item 5. Market for Registrants’ Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities	27
Item 6. Selected Financial Data	28
Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations
Overview	30
Results of Operations	32
Liquidity and Capital Resources	43
Outlook	55
Regulatory Matters	56
Accounting Matters	56
Effects of Inflation and Changing Prices	57
Item 7A. Quantitative and Qualitative Disclosures About Market Risk	58
Item 8. Financial Statements and Supplementary Data	62
Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	159
Item 9A. Controls and Procedures	160
Item 9B. Other Information	160

PART III
Item 10. Directors and Executive Officers of the Registrants	161
Item 11. Executive Compensation	162
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	166
Item 13. Certain Relationships and Related Transactions	167
Item 14. Principal Accountant Fees and Services	168

PART IV
Item 15. Exhibits and Financial Statement Schedules	168

SIGNATURES	171

EXHIBIT INDEX	178

Name	Age at 12/31/04	Positions and Offices Held and Business Experience
Gary L. Rainwater	58	Chairman, Chief Executive Officer, President and Director
Rainwater joined UE in 1979 as an engineer. He was elected vice president, corporate planning, in 1993. Rainwater was elected executive vice president of CIPS in January 1997 and president and chief executive officer of CIPS in December 1997. He was elected president of Resources Company in 1999 and Genco in 2000. He was elected president and chief operating officer of Ameren, UE, and Ameren Services in August 2001, at which time he relinquished his position as president of Resources Company and Genco. In January 2003, Rainwater was elected president and chief executive officer of CILCORP and CILCO upon Ameren’s acquisition of those companies. Effective January 1, 2004, Rainwater became chairman and chief executive officer of Ameren, UE, and Ameren Services, in addition to being president. At that time, he was also elected chairman of CILCORP and CILCO. Rainwater was elected chairman, chief executive officer and president of IP in September 2004 upon Ameren’s acquisition of that company. He currently holds the position of chairman and chief executive officer of CIPS, CILCO and IP, after relinquishing his position as president in October 2004.

Warner L. Baxter	43	Executive Vice President and Chief Financial Officer
Baxter joined UE in 1995 as assistant controller. He was promoted to controller of UE in 1996 and was elected vice president and controller of Ameren and UE in 1998. Baxter was elected vice president and controller of CIPS and Genco in 1999 and 2000, respectively. He was elected senior vice president, finance, of Ameren, UE, CIPS, Ameren Services, and Genco in 2001. In January 2003, Baxter was elected senior vice president of CILCORP and CILCO upon Ameren’s acquisition of those companies. Baxter was elected to his present position at Ameren, UE, CIPS, Genco, AERG, AFS, Medina Valley, CILCORP, and CILCO in October 2003 and at IP in September 2004, upon Ameren’s acquisition of that company.

Thomas R. Voss	57	Executive Vice President and Chief Operating Officer
Voss joined UE in 1969 as an engineer. From 1973 to 1998, he held various positions at UE, including district manager and distribution operating manager. Voss was elected vice president of CIPS in 1998 and senior vice president of UE and CIPS in 1999. He was elected senior vice president of CILCORP and CILCO in 2003 and of IP in September 2004 upon Ameren’s acquisitions of those companies. In October 2003, Voss was elected president of Genco, Resources Company, Marketing Company, AFS, Ameren Energy, Medina Valley, and AERG. However, with the exception of Ameren Energy, Medina Valley, and Resources Company, Voss relinquished his position as president of these companies in October 2004. He was elected to his present position at Ameren in January 2005.

Steven R. Sullivan	44	Senior Vice President, General Counsel and Secretary
Sullivan joined Ameren, UE and CIPS in 1998 as vice president, general counsel and secretary, and he added that position at Genco in 2000. In January 2003, Sullivan was elected vice president, general counsel, and secretary of CILCORP and CILCO upon Ameren’s acquisition of those companies. He was elected to his present position at Ameren, UE, CIPS, Genco, Marketing, Resources Company, AERG, AFS, Medina Valley, CILCORP, and CILCO in October 2003 and at IP in September 2004 upon Ameren’s acquisition of that company.

Jerre E. Birdsong	50	Vice President and Treasurer
Birdsong joined UE in 1977 as an economist. He was promoted to assistant treasurer in 1984 and manager of finance in 1989. He was elected as treasurer of UE in 1993. He was elected treasurer of Ameren and CIPS in 1997, Resources Company in 1999, Genco, AFS and Marketing in 2000, and AERG and Medina Valley in 2003. In addition to being treasurer, in 2001 he was elected to the position of vice president at Ameren and the subsidiaries listed above, with the exception of AERG and Medina Valley. Birdsong was elected vice president at AERG and Medina Valley in 2003. Additionally, he was elected vice president and treasurer of CILCORP and CILCO in January 2003, and of IP in September 2004, upon Ameren’s acquisitions of those companies.

Net Cumulative Effect After-Tax Gain (Loss)
Ameren^(a)	$	18
Genco		18
CILCORP^(b)(c)		4
CILCO		24
IP^(c)		(2	)

	2004
Statement of Income line item:
Other operations and maintenance^(a)	$	7

Interest^(b)		10
Fuel and purchased power^(c)		26
Income taxes^(d)		(17	)
Impact on net income	$	26

	2004
Statement of Income line item:
Fuel and purchased power^(a)	$	(4	)
Depreciation^(b)		(1	)
Income taxes^(c)		2
Impact on net income	$	(3	)

2004 versus 2003	Ameren^(a)			UE			CIPS			Genco			CILCORP ^(b)			CILCO			IP ^(c)
Electric revenue change:
CILCORP - January 2004	$	49		$	-		$	-		$	-		$	-		$	-		$	-
IP - Since September 30, 2004		229			-			-			-			-			-			-
Effect of weather (estimate)		(38	)		(24	)		(12	)		-			(1	)		(1	)		(16	)
Growth and other (estimate)		97			43			(5	)		65			(196	)		(196	)		(25	)
Rate reductions		(34	)		(34	)		-			-			-			-			-
Interchange revenues		70			20			-			23			27			27			-
EEI		(37	)		-			-			-			-			-			-
Total	$	336		$	5		$	(17	)	$	88		$	(170	)	$	(170	)	$	(41	)
Fuel and purchased power change:
CILCORP - January 2004	$	(26	)	$	-		$	-		$	-		$	-		$	-		$	-
IP - Since September 30, 2004		(128	)		-			-			-			-			-			-
Fuel:
Generation and other		(24	)		6			-			(23	)		(17	)		(7	)		-
Price		(9	)		(2	)		-			(6	)		11			11			-
Purchased power		(28	)		(24	)		16			2			162			159			57
EEI		7			-			-			-			-			-			-
Total	$	(208	)	$	(20	)	$	16		$	(27	)	$	156		$	163		$	57
Net change in electric margins	$	128		$	(15	)	$	(1	)	$	61		$	(14	)	$	(7	)	$	16

2003 versus 2002		Ameren^(a)	⁾		UE			CIPS			Genco	CILCORP ^(b)		⁾	CILCO ^(b)		⁾		IP ^(c)	⁾
Electric revenue change:
CILCORP acquisition	$	512		$	-		$	-		$	-	$	-		$	-		$	-
Effect of weather (estimate)		(121	)		(96	)		(16	)		-		(11	)		(11	)		(29	)
Growth and other (estimate)		46			39			(88	)		5		44			44			-
Rate reductions		(34	)		(34	)		-			-		-			-			(8	)
Interchange revenues		80			62			-			40		9			9			(7	)
EEI		(51	)		-			-			-		-			-			-
Total	$	432		$	(29	)	$	(104	)	$	45	$	42		$	42		$	(44	)
Fuel and purchased power change:
CILCORP acquisition	$	(276	)	$	-		$	-		$	-	$	-		$	-		$	-

	Net Cash Provided By Operating Activities						Net Cash Provided By (Used In) Investing Activities									Net Cash Provided By (Used In) Financing Activities
	2004		2003		2002		2004			2003			2002			2004			2003			2002
Ameren^(a)	$	1,129	$	1,022	$	827	$	(1,266	)	$	(1,181	)	$	(803	)	$	95		$	(358	)	$	537
UE		749		633		692		(580	)		(503	)		(454	)		(136	)		(124	)		(244	)
CIPS		73		57		95		78			12			(7	)		(165	)		(70	)		(97	)
Genco		180		211		108		(50	)		(58	)		(442	)		(131	)		(154	)		335
CILCORP^(b)		136		70		88		(120	)		(95	)		(120	)		(20	)		4			46
CILCO		137		103		109		(125	)		(86	)		(123	)		(18	)		(31	)		24
IP^(c)		247		128		218		(272	)		(126	)		(141	)		13			(102	)		(1	)

Capital Expenditures	2004		2003		2002
Ameren^(a)	$	806	$	682	$	787
UE		524		480		520
CIPS		46		50		57
Genco		50		58		442
CILCORP^(b)		125		87		124
CILCO		125		87		124
IP^(c)		135		126		144
Other^(d)		26		23		(232	)

	2005		2006		-		2009		Total
UE	$	520	$	2,460	-	$	3,480	$	2,980	-	$	4,000
CIPS		55		260	-		300		315	-		355
Genco		60		480	-		590		540	-		650
CILCO (T&D)		55		180	-		200		235	-		255
CILCO^(a)		80		170	-		220		250	-		300
IP		140		485	-		530		625	-		670
Other^(b)		20		35	-		50		55	-		70
Total Ameren	$	930	$	4,070	-	$	5,370	$	5,000	-	$	6,300

	2005	2006 - 2009	2010 - 2015	Total
Ameren	$ 50	$ 510 - $ 1,360	$ 355 - $ 1,130	$ 1,400 - $ 1,900
UE	20	160 - 880	175 - 880	840 - 1,140
Genco	10	250 - 340	140 - 200	400 - 550
CILCO	20	100 - 140	40 - 50	160 - 210

Credit Facility	Expiration	Amount Committed	Amount Available
Ameren:^(a)
Multiyear revolving	July 2006	$ 235	$ 89
Multiyear revolving	July 2007	350	350
Multiyear revolving	July 2009	350	350

	Total Committed		Less than 1 Year		1 - 3 Years		4 - 5 Years		More than 5 Years
Ameren	$	935	$	-	$	585	$	350	$	-
UE		154		154		-		-		-
CIPS		15		15		-		-		-
CILCO		60		60		-		-		-
EEI		45		45		-		-		-
Total	$	1,209	$	274	$	585	$	350	$	-

	Month Issued, Redeemed, Repurchased or Matured		2004		2003			2002
Issuances
Long-term debt
Ameren:
5.70% notes due 2007	January	$	-	$	-		$	100
Senior notes due 2007^(a)	March		-		-			345
UE:
5.10% Senior secured notes due 2019	September		300		-			-
5.50% Senior secured notes due 2014	May		104		-			-
5.50% Senior secured notes due 2034	March		-		184			-
4.75% Senior secured notes due 2015	April		-		114			-
5.10% Senior secured notes due 2018	July		-		200			-
4.65% Senior secured notes due 2013	October		-		200			-
5.25% Senior secured notes due 2012	August		-		-			173
CIPS:
2004 Series environmental improvement revenue bonds due 2025	November		35		-			-
Genco:
7.95% Senior notes due 2032	June		-		-			275
CILCO:
Series 2004 environmental improvement revenue bonds due 2039	November		19		-			-
Secured term loan due 2004	June		-		-			100
IP:
11.50% series due 2010	January/December		-		150			400
Less: CILCO and IP activity prior to acquisitions			-		(150	)		(500	)
Total Ameren long-term debt issuances		$	458	$	698		$	893
Common stock
Ameren:
6,325,000 Shares at $40.50	January	$	-	$	256		$	-
19,063,181 Shares at 45.90	February		875		-			-
5,000,000 Shares at $39.50	March		-		-			198
750,000 Shares at $38.865	March		-		-			29
10,925,000 Shares at $42.00	July		459		-			-
8,050,000 Shares at $42.00	September		-		-			338
DRPlus and 401(k)^(b)	Various		107		105			93
Total common stock issuances			1,441	$	361		$	658
Total Ameren long-term debt and common stock issuances		$	1,899	$	1,059		$	1,551
Redemptions, Repurchases and Maturities
Long-term debt/capital lease
Ameren:
Floating Rate Notes due 2003	December	$	-	$	150		$	-
UE:
6.875% First mortgage bonds due 2004	August		188		-			-
7.00% First mortgage bonds due 2024	June		100		-			-
7.375% First mortgage bonds due 2004	December		85		-			-
8.25% First mortgage bonds due 2022	April		-		104			-
8.00% First mortgage bonds due 2022	May		-		85			-
7.65% First mortgage bonds due 2003	July		-		100			-
7.15% First mortgage bonds due 2023	August		-		75			-
8.75% First mortgage bonds due 2021	September		-		-			125
8.33% First mortgage bonds due 2002	December		-		-			75
Peno Creek CT	December		4		3			-


	Month Issued Redeemed, Repurchased or Matured		2004			2003			2002
CIPS:
1993 Series A 6.375% due 2028	December	$	35		$	-		$	-
1993 Series B-2 5.90% due 2028	December		18			-			-
1993 Series C-2 5.70% due 2026	December		17			-			-
6.99% Series 97-1 first mortgage bonds due 2003	March		-			5			-
6.375% Series Z first mortgage bonds due 2003	April		-			40			-
7.50% Series X first mortgage bonds due 2007	April		-			50			-
6.94% Series 97-1 first mortgage bonds due 2002	March		-			-			5
6.96% Series 97-1 first mortgage bonds due 2002	September		-			-			5
6.75% Series Y first mortgage bonds due 2002	September		-			-			23
CILCORP:^(c)
9.375% Senior bonds due 2029	May/July		23			31			-
8.70% Senior bonds due 2009	September		-			17			-
CILCO:^(c)
Secured bank term loan	February		100
1992 Series C 6.50% due 2010	December		5			-			-
1992 Series A 6.50% due 2018	December		14			-			-
6.82% First mortgage bonds due 2003	February		-			25			-
8.20% First mortgage bonds due 2022	April		-			65			-
7.80% Two series of first mortgage bonds due 2023	April		-			10			-
Hallock substation power modules bank loan due through 2004	August		-			3			1
Kickapoo substation power modules bank loan due through 2004	August		-			2			-
IP:^(c)
11.50% First mortgage bonds due 2010	November/December		649			-			-
7.50% First mortgage bonds due 2025	December		68			-			-
7.40% Series 1994 pollution control bonds B due 2024	December		86			-			-
6.50% First mortgage bonds due 2003	August		-			100
6.00% First mortgage bonds due 2003	September		-			90			-
6.25% First mortgage bonds due 2002	July		-			-			96
Note payable to IP SPT
5.31% Series due 2002	Various		-			-			31
5.34% Series due 2003	Various		-			29			55
5.38% Series due 2005	Various		32			57			-
5.54% Series due 2007	Various		54			-			-
Medina Valley
Secured term loan due 2019	June		-			36			-
EEI:
2000 bank term loan due 2004	June		40			-			-
1991 8.60% Senior medium term notes, amortization	December		6			7			6
1994 6.61% Senior medium term notes, amortization	December		8			7			8
Preferred Stock
UE: $1.735 Series	September		-			-			42
CILCO: 5.85% Series	July		1			1			-
CIPS: 1993 auction preferred	December		-			30			-
Less: CILCORP, CILCO and IP activity prior to acquisition date			(67	)		(276	)		(183	)
Total Ameren long-term debt and preferred stock redemptions, repurchases and maturities		$	1,466		$	846		$	289

	Authorized Date		Authorized Amount		Issued		Available
Ameren^(a)	June 2004	$	2,000	$	459	$	1,541
UE^(b)	September 2003		1,000		689		311
CIPS	May 2001		250		150		100

	Total		Less than 1 Year		1 - 3 Years		4 - 5 Years		More than 5 Years
Ameren:^(a)
Long-term debt and capital lease obligations^(b)	$	5,312	$	423	$	695	$	706		$	3,488
Short-term debt		417		417		-		-			-
Interest payments ^(c)		3,518		303		528		420			2,267
Operating leases^(d)		208		29		48		28			103
Other obligations^(e)		3,898		1,359		1,756		731			52
Preferred stock of subsidiary subject to mandatory redemption		20		1		2		17			-
Total cash contractual obligations^(f)	$	13,373	$	2,532	$	3,029	$	1,902		$	5,910
UE:
Long-term debt and capital lease obligations	$	2,066	$	3	$	8	$	156		$	1,899
Short-term debt		375		375		-		-			-
Borrowings from money pool		2		2		-		-			-
Interest payments^(c)		1,366		90		180		163			933
Operating leases^(d)		119		10		18		17			74
Other obligations^(e)		1,546		498		708		320			20
Total cash contractual obligations^(f)	$	5,474	$	978	$	914	$	656		$	2,926
CIPS:
Long-term debt	$	451	$	20	$	20	$	15		$	396
Borrowings from money pool		68		68		-		-			-
Interest payments		307		26		49		47			185
Other obligations^(e)		405		203		199		3			-
Total cash contractual obligations^(f)	$	1,231	$	317	$	268	$	65		$	581

		Total	Less than 1 year			1 - 3 Years		4 - 5 Years	More than 5 Years
CILCORP:
Long-term debt^(b)	$	556	$	16	$	50	$	198		$	292
Borrowings from money pool		166		166		-		-			-
Interest payments		680		46		88		80			466
Operating leases^(d)		3		1		2		-			-
Preferred stock of subsidiary subject to mandatory redemption		20		1		2		17			-
Other obligations^(e)		604		232		282		87			3
Total cash contractual obligations^(f)	$	2,029	$	462	$	424	$	382		$	761
CILCO:
Long-term debt^(b)	$	138	$	16	$	50	$	-		$	72
Borrowings from money pool		169		169		-		-			-
Interest payments		86		8		12		8			58
Operating leases^(d)		3		1		2		-			-
Preferred stock subject to mandatory redemption		20		1		2		17			-
Other obligations^(e)		604		232		282		87			3
Total cash contractual obligations^(f)	$	1,020	$	427	$	348	$	112		$	133
IP:
Long-term debt^(b)	$	1,079	$	144	$	172	$	337		$	426
Interest payments^(c)		360		48		81		52			179
Operating leases		28		7		13		5			3
Other obligations^(e)		492		282		191		8			11
Total cash contractual obligations^(f)	$	1,959	$	481	$	457	$	402		$	619

	Moody’s	S&P	Fitch
Ameren:
Issuer/corporate credit rating	A3	A-	N/A
Unsecured debt	A3	BBB+	A-
Commercial paper	P-2	A-2	F2
UE:
Secured debt	A1	A-	A+
Commercial paper	P-1	A-2	F1
CIPS:
Secured debt	A1	A-	A
Genco:
Unsecured debt	A3/Baa2	A-	BBB+
CILCORP:
Unsecured debt	Baa2	BBB+	BBB+
CILCO:
Secured debt	A2	A-	A
IP:
Secured debt	Baa3	A-	BBB

Accounting Policy	Uncertainties Affecting Application
*Regulatory Mechanisms and Cost Recovery* All of the Ameren Companies, except Genco, defer costs as regulatory assets in accordance with SFAS No. 71, “Accounting for the Effects of Certain Types of Regulation,” and make investments that they assume will be collected in future rates.	Regulatory environment, external regulatory decisions and requirements Anticipated future regulatory decisions and their impact Impact of deregulation, rate freezes, and competition on ratemaking process and ability to recover costs
Basis for Judgment We determine which costs are recoverable by consulting previous rulings by state regulatory authorities in jurisdictions where we operate or other factors that lead us to believe that cost recovery is probable. If facts and circumstances led us to conclude that a recorded regulatory asset was probably no longer capable of being recovered, we would record a charge to earnings, which could be material.

*Environmental Costs* We accrue for all known environmental contamination where remediation can be reasonably estimated, but some of our operations have existed for over 100 years and previous contamination may be unknown to us.	Extent of contamination Responsible party determination Approved methods for cleanup Present and future legislation and governmental regulations and standards Results of ongoing research and development regarding environmental impacts
Basis for Judgment We determine the proper amounts to accrue for known environmental contamination by using internal and third-party estimates of cleanup costs in the context of current remediation standards and available technology.

Accounting Policy	Uncertainties Affecting Application
*Unbilled Revenue* At the end of each period, we estimate, based on expected usage, the amount of revenue to record for services that have been provided to customers, but not billed.	Projecting customer energy usage Estimating impacts of weather and other usage-affecting factors for the unbilled period Estimating loss of energy during the process of transmission and delivery
Basis for Judgment We base our determination of the proper amount of unbilled revenue to accrue each period on the volume of energy delivered as valued by a model of billing cycles and historical usage rates and growth by customer class for our service area, as adjusted for the modeled impact of seasonal and weather variations based on historical results.

*Valuation of Goodwill, Long-Lived Assets and Asset Retirement Obligations*
We assess the carrying value of our goodwill and long-lived assets to determine whether they are impaired. We also review for the existence of asset retirement obligations. If an asset retirement obligation is identified, we determine the fair value of the obligation and subsequently reassess and adjust the obligation, as necessary. See Note 1 - Summary of Significant Accounting Policies to our financial statements under Part II, Item 8, of this report.	Management's identification of impairment indicators Changes in business, industry, technology, or economic and market conditions Valuation assumptions and conclusions Estimated useful lives of our significant long-lived assets Actions or assessments by our regulators Identification of an asset retirement obligation
Basis for Judgment Annually, or whenever events indicate a valuation may have changed, we use internal models and third parties to determine fair values. We use various methods to determine valuations, including earnings before interest, taxes, depreciation and amortization multiples, and discounted, undiscounted, and probabilistic discounted cash flow models with multiple scenarios. The identification of asset retirement obligations is conducted through the review of legal documents and interviews.
*Benefit Plan Accounting* Based on actuarial calculations, we accrue costs of providing future employee benefits in accordance with SFAS Nos. 87, 106 and 112, which provide guidance on benefit plan accounting. See Note 11 - Retirement Benefits to our financial statements under Part II, Item 8, of this report.	Future rate of return on pension and other plan assets Interest rates used in valuing benefit obligations Health care cost trend rates Timing of employee retirements and mortality assumptions
Basis for Judgment We use a third-party consultant to assist us in evaluating and recording the proper amount for future employee benefits. Our ultimate selection of the discount rate, health care trend rate, and expected rate of return on pension assets is based on our review of available current, historical and projected rates, as applicable.

	Interest Expense		Net Income^(a)
Ameren	$	13	$	(9	)
UE		8		(5	)
CIPS		1		(1	)
Genco		2		(1	)
CILCORP		3		(2	)
CILCO		2		(1	)
IP		4		(2	)

		Coal			Transportation
	Fuel Expense		Net Income^(a)			Fuel Expense		Net Income^(a)
Ameren	$	7	$	(5	)	$	6	$	(4	)
UE		4		(3	)		4		(3	)
Genco		2		(1	)		1		-
CILCORP^(b)		1		-			1		-
CILCO		1		-			1		-

	2005			2006			2007 - 2009
Ameren:
Coal		92	%		88	%		49	%
Coal transportation		99			96			64
Nuclear fuel		100			100			34
Natural gas for generation		35			8			1
Natural gas for distribution^(b)		89			9			6
UE:
Coal		92	%		87	%		45	%
Coal transportation		100			99			61
Nuclear fuel		100			100			34
Natural gas for generation		9			6			3
Natural gas for distribution^(b)		100			13			6
CIPS:
Natural gas for distribution^(b)		89	%		16	%		13	%
Genco:
Coal		95	%		88	%		58	%
Coal transportation		98			98			65
Natural gas for generation		40			7			1
CILCORP:^(a)
Coal		93	%		92	%		46	%
Coal transportation		97			73			68
Natural gas for distribution^(b)		98			18			12
CILCO:
Coal		93	%		92	%		46	%
Coal transportation		97			73			68
Natural gas for distribution^(b)		98			18			12
IP:
Natural gas for distribution^(b)		80	%		-			-


	AMEREN CORPORATION (Registrant)

Date: March 9, 2005	By:	/s/ Gary L. Rainwater
		Gary L. Rainwater
		Chairman, Chief Executive Officer and President