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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM 10-K

or

This combined Form 10-K is separately filed by Alliant Energy Corporation, Interstate Power and Light Company and Wisconsin Power and Light Company. Information contained in the Form 10-K relating to Interstate Power and Light Company and Wisconsin Power and Light Company is filed by such registrant on its own behalf. Each of Interstate Power and Light Company and Wisconsin Power and Light Company makes no representation as to information relating to registrants other than itself.

Securities registered pursuant to Section 12 (g) of the Act: Wisconsin Power and Light Company Preferred Stock
      (Accumulation without Par Value)

Indicate by check mark whether the registrants (1) have filed all reports required to be filed by Section 13 or 15 (d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) have been subject to such filing requirements for the past 90 days. Yes [X] No [ ]

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of the registrants’ knowledge, in definitive proxy or information statements incorporated by reference in Part III of the Form 10-K or any amendment to this Form 10-K. [X]

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Proxy Statements relating to Alliant Energy Corporation’s and Wisconsin Power and Light Company’s 2004 Annual Meetings of Shareowners are, or will be upon filing with the Securities and Exchange Commission, incorporated by reference into Part III hereof.

TABLE OF CONTENTS

DEFINITIONS

Certain abbreviations or acronyms used in the text and notes of this report are defined below:

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FORWARD-LOOKING STATEMENTS
Refer to “Forward-Looking Statements” in MD&A for information and disclaimers regarding forward-looking statements contained in this Annual Report on Form 10-K.

PART I

This Annual Report on Form 10-K includes information relating to Alliant Energy, IP&L and WP&L (as well as Resources and Corporate Services). Where appropriate, information relating to a specific entity has been segregated and labeled as such. At Dec. 31, 2002, the assets and liabilities of Alliant Energy’s oil and gas (WPC), Australian (including Southern Hydro), affordable housing and SmartEnergy businesses were classified as held for sale. Alliant Energy completed the sale of the Australian, affordable housing and SmartEnergy businesses in 2003, as well as the sale of over 94% of the WPC stock. The operating results for these non-regulated businesses for all periods presented have been separately classified and reported as discontinued operations in Alliant Energy’s Consolidated Financial Statements and Notes to Consolidated Financial Statements included in this Annual Report. Refer to Note 16 of Alliant Energy’s “Notes to Consolidated Financial Statements” for additional information.

ITEM 1. BUSINESS

A. GENERAL
The primary first tier subsidiaries of Alliant Energy include: IP&L, WP&L, Resources and Corporate Services. Among various other regulatory constraints, Alliant Energy is operating as a registered public utility holding company subject to the limitations imposed by PUHCA. Alliant Energy was incorporated in Wisconsin in 1981. A brief description of the primary first-tier subsidiaries of Alliant Energy is as follows:

1)     IP&L — incorporated in 1925 in Iowa as Iowa Railway and Light Corporation. IP&L is a public utility engaged principally in the generation, transmission, distribution and sale of electric energy; and the purchase, distribution, transportation and sale of natural gas in selective markets in Iowa, Minnesota and Illinois. In Iowa, non-exclusive franchises, which cover the use of streets and alleys for public utility facilities in incorporated communities, are granted for a maximum of 25 years by a majority vote of local qualified residents. At Dec. 31, 2003, IP&L supplied electric and gas service to 528,977 and 235,812 (excluding transportation and other) customers, respectively. IP&L also provides steam services to certain customers in one community in Iowa and various other energy-related products and services including construction management services for wind farms. In 2003, 2002 and 2001, IP&L had no single customer for which electric, gas, steam and/or other sales accounted for 10% or more of IP&L’s consolidated revenues.

2)     WP&L — incorporated in 1917 in Wisconsin as Eastern Wisconsin Electric Company. WP&L is a public utility engaged principally in the generation, distribution and sale of electric energy; and the purchase, distribution, transportation and sale of natural gas in selective markets. Nearly all of WP&L’s customers are located in south and central Wisconsin. WP&L operates in municipalities pursuant to permits of indefinite duration, which are regulated by Wisconsin law. At Dec. 31, 2003, WP&L supplied electric and gas service to 436,976 and 172,615 (excluding transportation and other) customers, respectively. WP&L also provides water services in select markets and various other energy-related products and services including construction management services for wind farms. In 2003, 2002 and 2001, WP&L had no single customer for which electric, gas, water and/or other sales accounted for 10% or more of WP&L’s consolidated revenues. WPL Transco LLC is a wholly-owned subsidiary of WP&L and holds WP&L’s investment in ATC. WP&L also owns all of the outstanding capital stock of South Beloit, a public utility supplying electric, gas and water service, principally in Winnebago County, Illinois, which was incorporated in 1908.

3)     RESOURCES — incorporated in 1988 in Wisconsin. The majority of Alliant Energy’s non-regulated investments are organized under Resources. Resources’ significant wholly-owned subsidiaries at Dec. 31, 2003 include AEG, International, Integrated Services, Neenah, Transportation and Synfuel. Refer to “D. Information Relating to Non-regulated Operations” for additional details.

4)     CORPORATE SERVICES — incorporated in 1997 in Iowa. Corporate Services was formed to provide administrative services to Alliant Energy and its subsidiaries as required under PUHCA.

Refer to Note 13 of the “Notes to Consolidated Financial Statements” for further discussion of business segments, which information is incorporated herein by reference.

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B. INFORMATION RELATING TO ALLIANT ENERGY ON A CONSOLIDATED BASIS

1) EMPLOYEES
As of Dec. 31, 2003, Alliant Energy’s consolidated subsidiaries had the following employees (full-time and part-time):

In September 2004, three bargaining agreements expire representing approximately 17% of employees covered under bargaining agreements and 6% of total Alliant Energy employees. WP&L’s bargaining agreement with IBEW Local 965 expired in 2003 and has not been renewed, which represents 49% of employees covered under bargaining agreements and 16% of total Alliant Energy employees. While negotiations continue on the WP&L bargaining agreement, Alliant Energy is currently unable to predict the outcome. Alliant Energy has not experienced any significant work stoppage problems in the past.

2) CAPITAL EXPENDITURE AND INVESTMENT PLANS
Refer to “Liquidity and Capital Resources — Construction and Acquisition Expenditures” in MD&A for discussion of anticipated construction and acquisition expenditures for 2004 and 2005.

3) REGULATION
PUHCA — Alliant Energy operates as a registered public utility holding company subject to regulation by the SEC under PUHCA. Regulation under PUHCA includes provisions relating to the issuance and sales of securities, acquisitions and sales of certain utility properties, acquisitions and retention of interests in non-utility businesses, including EWGs and FUCOs, and the services provided by Corporate Services to Alliant Energy and its subsidiaries. Under an SEC order, Alliant Energy has aggregate investment authority for EWGs and FUCOs equivalent to 100% of consolidated retained earnings as defined in the regulations. At Dec. 31, 2003, Alliant Energy’s remaining investment authority under this Order was approximately $267 million.

PSCW — Alliant Energy is subject to regulation by the PSCW. The PSCW regulates, among other things, the type and amount of Alliant Energy’s investments in non-utility businesses. WP&L is also subject to regulation by the PSCW regarding retail utility rates and service, accounts, issuance and use of proceeds of securities, certain additions and extensions to facilities and in other respects. WP&L is required to file a rate case with the PSCW at least every two years based on a forward-looking test year period.

IUB — IP&L operates under the jurisdiction of the IUB. The IUB has authority to regulate rates and standards of service, to prescribe accounting requirements and to approve the location and construction of electric generating facilities having a capacity in excess of 25,000 KW. Requests for rate relief are based on historical test periods, adjusted for certain known and measurable changes. The IUB must decide on requests for rate relief within 10 months of the date of the application for which relief is filed or the interim prices granted become permanent. Interim rates, if allowed, are permitted to become effective, subject to refund, no later than 90 days after the rate increase application is filed.

MPUC — IP&L is also subject to regulation by the MPUC. Requests for rate relief can be based on either historical or projected data. The MPUC must reach a final decision within 10 months of filing for rate relief. Interim rates are permitted. The MPUC also has jurisdiction to annually approve IP&L’s capital structure.

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ICC — IP&L and South Beloit are subject to regulation by the ICC for retail utility rates and service, accounts, issuance and use of proceeds of securities, certain additions and extensions to facilities and in other respects. Requests for rate relief must be decided within 11 months of filing.

FERC — FERC has jurisdiction under the Federal Power Act over certain of the electric utility facilities and operations, wholesale rates and accounting practices of IP&L and WP&L, and in certain other respects. In addition, certain natural gas facilities and operations of IP&L and WP&L are subject to the jurisdiction of FERC under the Natural Gas Act.

Environmental — The EPA administers certain federal regulatory programs and has delegated the administration of other environmental regulatory programs to the applicable state environmental agencies. In general, the state agencies have jurisdiction over safety, air and water quality, and waste handling standards associated with electric power generation, including the level and flow of water pertaining to hydroelectric generation. In certain cases, the state environmental agencies have delegated the administration of environmental programs to local agencies. In addition, International has investments that are subject to environmental regulations in the countries in which they operate.

Nuclear — IP&L and WP&L are directly and indirectly subject to the jurisdiction of the NRC, with respect to DAEC and Kewaunee, respectively. Among other things, the NRC regulates the disposal of nuclear fuel and other radioactive wastes.

Brazil — The electric industry in Brazil, as it relates to Alliant Energy’s unconsolidated investments, is regulated by the Brazilian federal government, acting through the Ministry of Mines and Energy, which has exclusive authority over the electric sector through its regulatory powers. Regulatory policy for the sector is implemented by an autonomous national electric energy agency (Agencia Nacional de Energia Eletrica or “ANEEL”), which delegates certain functions to agencies based in various states of Brazil. However, ANEEL cannot delegate any authority regarding tariffs to state agencies. In January 2003, a new Minister of Mines and Energy was appointed, resulting in the cessation of the ongoing comprehensive review of the regulatory process and policies that began in 2002. A new plan was announced in December 2003 (effective date as yet unspecified) which is intended to provide limited and balanced regulation of the generation and distribution of electric energy within the sectors of the Brazilian economy. Although all of the details and the precise timing of the plan are unknown at this time, Alliant Energy does not expect the plan will have a material adverse impact on Alliant Energy’s investments in Brazil.

Refer to Note 2 of Alliant Energy’s “Notes to Consolidated Financial Statements” and “Rates and Regulatory Matters” in MD&A for additional information regarding regulation and utility rate matters.

4) STRATEGIC OVERVIEW
Refer to “Strategic Overview” in MD&A for discussion of various strategic actions Alliant Energy has taken to strengthen its financial profile and information regarding Alliant Energy’s updated strategic plan.

C. INFORMATION RELATING TO DOMESTIC UTILITY OPERATIONS
Alliant Energy realized 48%, 47%, 3% and 2% of its 2003 electric utility revenues in Iowa, Wisconsin, Minnesota and Illinois, respectively. Approximately 90% was regulated by the respective state commissions while the other 10% was regulated by FERC. Alliant Energy realized 48%, 47%, 3% and 2% of its 2003 gas utility revenues in Iowa, Wisconsin, Minnesota and Illinois, respectively.

IP&L realized 92%, 6% and 2% of its 2003 electric utility revenues in Iowa, Minnesota and Illinois, respectively. Approximately 96% was regulated by the respective state commissions while the other 4% was regulated by FERC. IP&L realized 93%, 5% and 2% of its 2003 gas utility revenues in Iowa, Minnesota and Illinois, respectively. WP&L realized 99% of its 2003 electric utility revenues in Wisconsin and 1% in Illinois. Approximately 83% was regulated by the PSCW or the ICC while the other 17% was regulated by FERC. WP&L realized 97% of its 2003 gas utility revenues in Wisconsin and 3% in Illinois.

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1) DOMESTIC ELECTRIC UTILITY OPERATIONS
General — IP&L and WP&L provide electric service in Iowa, southern and central Wisconsin, southern Minnesota and northern and northwestern Illinois. The number of electric customers and communities served at Dec. 31, 2003 was as follows:

2003 electric utility operations accounted for 73% and 75% of operating revenues and 92% and 85% of operating income for IP&L and WP&L, respectively.

Electric sales are seasonal to some extent with the annual peak normally occurring in the summer months. In 2003, the maximum peak hour demands for IP&L and WP&L were 3,123 MW and 2,782 MW, respectively, both on Aug. 20, 2003. In 2003, the maximum peak hour demand for Alliant Energy was 5,887 MW on Aug. 20, 2003, which was the coincident peak of the entire Alliant Energy system.

Transmission Business — IP&L and WP&L are members of the MAIN Regional Reliability Council which is one of the 10 regional members of NERC. Each regional member of NERC is responsible for maintaining reliability in its area through coordination of planning and operations.

In 2002, IP&L filed for IUB and MPUC approval to transfer its transmission assets to TRANSLink, a proposed independent for-profit, transmission-only company. In November 2003, TRANSLink announced that upon direction of the participant utilities, formation of TRANSLink had been suspended due to continued regulatory and market uncertainty. IP&L continues to support the independent transmission company model but is not able to predict the ultimate outcome of the structure of its transmission business.

WP&L transferred its transmission assets with no gain or loss to a transmission-only company, ATC, on Jan. 1, 2001, and had an ownership percentage in ATC of approximately 25% at Dec. 31, 2003. This transfer has not resulted in a significant impact on WP&L’s financial condition or results of operations since FERC allows ATC to earn a return on the contributed assets comparable to the return formerly allowed WP&L by the PSCW and FERC. During 2003, ATC returned approximately 80% of its earnings to the equity holders and, although no assurance can be given, Alliant Energy anticipates ATC will continue this dividend payout ratio in the future. ATC realizes its revenues from the provision of transmission services to both participants in ATC as well as non-participants. ATC is a transmission-owning member of the Midwest ISO and the MAIN Regional Reliability Council.

In 2002, the PSCW issued a final ruling regarding incremental electric transmission costs, such as ATC start-up costs and ongoing network transmission costs. This ruling allows Wisconsin utilities, including WP&L, to continue to defer any such costs related to retail service for five years with deferred amounts included in future base rates. Further, in December 2003, the PSCW issued a final order in WP&L’s 2004 retail rate case, which expanded the 2002 ruling allowing for the deferral of any retail transmission wheeling expenses that are different from amounts included in existing rates. During the remainder of this deferral period, changes in total retail electric transmission costs will have no material impact on WP&L’s results of operations.

IP&L and WP&L are members of the Midwest ISO, which is in the process of restructuring the bulk power market in its domain.  Such restructuring could have an impact on the costs associated with Alliant Energy serving its utility customers’ energy requirements. The Midwest ISO currently plans to implement the market restructuring effective Dec. 1, 2004. Given the anticipated regulatory treatment of any potential cost differences, Alliant Energy does not currently expect the ultimate outcome will have a material impact on its results of operations or financial condition.

The PSCW is authorized to order construction of new transmission facilities. In 2001, the PSCW approved the construction of a 345-kilovolt transmission line, which would be constructed by ATC and would improve transmission import capabilities in Wisconsin. Due to significant cost increases, the PSCW re-evaluated and re-approved the project in December 2003. Pending various other regulatory approvals, construction could begin as early as 2004 and the transmission line is expected to be in service in 2008.

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IP&L maintains and operates transmission and substation facilities connecting with its high voltage transmission systems pursuant to a non-cancelable operation agreement (the Operating Agreement) with CIPCO. The Operating Agreement, which will terminate on Dec. 31, 2035, provides for the joint use of certain transmission facilities of IP&L and CIPCO. IP&L has transmission interconnections at various locations with nine other transmission owning utilities in the Midwest and ATC also has various transmission interconnections. These interconnections enhance the overall reliability of the Alliant Energy transmission system and provide access to multiple sources of economic and emergency energy.

In 2002, FERC issued a notice of proposed rules intended to standardize the wholesale electric market, which has generated significant industry discussion. Although Alliant Energy believes that standardization of the wholesale electric market is appropriate and would benefit market participants, there may be significant changes to the proposed rules before they are adopted. Therefore, Alliant Energy cannot determine the impact the final rules will have on its results of operations or financial condition.

Refer to “Properties” for additional information regarding electric properties.

Power Supply — Alliant Energy currently anticipates meeting its 2004 power supply requirements through a variety of incremental power supply resources including purchased-power contracts utilizing existing firm transmission rights and additional power purchases from existing generating units located within and outside of Alliant Energy’s service territory. While Alliant Energy currently expects to meet utility customer demands in 2004, unanticipated reliability issues could still arise in the event of unexpected delays in the construction of new generating and/or transmission facilities, power plant outages, transmission system outages or extended periods of extremely hot weather. Refer to “Strategic Overview — Updated Strategic Plan” in MD&A for discussion of Alliant Energy’s domestic utility generation plan.

Average Fuel Costs — Refer to the Electric Operating Information tables for details on the sources of electric energy for Alliant Energy, IP&L and WP&L from 2001 to 2003. The average cost of fuel per million British Thermal Units used for electric generation was as follows:

Coal — Alliant Energy, through Corporate Services, IP&L and WP&L, has entered into contracts with different suppliers to ensure that a specified supply of coal is available at known prices for IP&L and WP&L for 2004 through 2008. These contracts provide for a portfolio of coal supplies that cover approximately 96%, 76%, 54%, 21% and 11% of the total utilities’ estimated coal supply needs for 2004 through 2008, respectively. Management believes this portfolio of coal supplies represents a reasonable balance between the risks of insufficient supplies and those associated with larger open positions subject to price volatility in the coal markets. Remaining coal requirements will be met from either future contracts or purchases in the spot market.

The majority of the coal utilized by IP&L and WP&L is from the Wyoming Powder River Basin. A majority of this coal is transported by rail-car directly from Wyoming to IP&L’s and WP&L’s generating stations, with the remainder transported from Wyoming to the Mississippi River by rail-car and then via barges to the final destination. As protection against interruptions in coal deliveries, IP&L and WP&L maintain average coal inventories of 25 to 50 days for generating stations with year-round deliveries and 30 to 150 days (depending upon the time of year) for generating stations with seasonal deliveries.

Average delivered fossil fuel costs are expected to increase in the future due to price/rate structures and adjustment provisions in existing coal and transportation contracts and recent coal market trends. Existing coal contracts with terms of greater than one year have fixed future year prices that generally reflect recent upward market trends. Other factors which may impact coal prices are changes in various associated laws and regulations. For example, sulfur dioxide and NOx emission restrictions and other environmental limitations on generating stations have increased significantly and proposed additional restrictions (including mercury emissions), if enacted, will likely limit the ability to obtain, and further increase the cost of, adequate coal supplies. Rate adjustment provisions in transportation contracts are primarily based on changes in the Rail Cost Adjustment Factor as published by the U.S. Surface Transportation Board. Refer to Note 1(i) for discussion of IP&L’s and WP&L’s rate recovery of fuel costs, Note 10(a) for information on coal derivatives and Note 11(b) for details relating to coal purchase commitments in the “Notes to Consolidated Financial Statements.”

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Purchased-Power — During 2003, approximately 25% and 31% of IP&L’s and WP&L’s total MWh requirements, respectively, were met through purchased-power. Refer to Notes 3 and 11(b) of the “Notes to Consolidated Financial Statements” for details relating to purchased-power commitments and “Transmission Business” for discussion of proposed rules intended to standardize the wholesale electric market.

Nuclear — Summary — IP&L and WP&L own partial interests in two nuclear generating facilities, DAEC and Kewaunee, respectively, which are operated by the NMC under contract to the majority owners, which remain in effect until notice of termination is provided one year prior to such termination would be effective. Alliant Energy has a 20% ownership interest in the NMC. The NMC operates all nuclear plants owned by the NMC partners, which provides long-term safety, reliability and operational benefits for the plant owners. The NMC currently operates eight nuclear generating units at six sites but has no ownership interest in the plants it operates and bears no financial risk associated with operation of the plants. The plant owners retain all rights to the energy generated at the plants and all financial responsibility for their safe operation, maintenance and decommissioning. Certain details for DAEC and Kewaunee are as follows:

DAEC License Renewal — IP&L has made no decision regarding license extension for DAEC. IP&L’s approach has been and continues to be to preserve the option of renewing the license and has directed that DAEC be operated and maintained in a manner that ensures license extension remains a viable option. Preserving DAEC’s license extension option will include ensuring adequate time is available for the possibility of preparing specific license renewal studies, submittal of study results for NRC review, evaluation of the results of the NRC’s review, and making a decision on whether and to what degree any license extension will be pursued.

Kewaunee Sale — Refer to Note 17 of Alliant Energy’s “Notes to Consolidated Financial Statements” for information on the sale of Kewaunee by WP&L and WPSC expected to be completed by fall 2004, pending various regulatory approvals.

Nuclear Operating Issues — The NRC has significant regulatory authority over the design and operation of nuclear generating facilities with regard to environmental considerations and public health and safety. Exercise of this authority by the NRC is continuous and responsive to any nuclear related issue.

In February 2002, the NRC issued an order to all licensees formalizing their requirements for additional security resulting from the Sept. 11, 2001 terrorist attacks on the U.S. Prior to this order, the additional security measures were voluntary, based on NRC guidance. The NMC, as operator of DAEC and Kewaunee, has fully implemented the immediate actions required and is in the process of completing longer term actions as required. In December 2001, the PSCW authorized WP&L to defer incremental costs for security measures and insurance premiums related to the Sept. 11, 2001 terrorist attacks. Both IP&L and WP&L are recovering the costs of the required immediate actions in their respective rates.

IP&L’s and WP&L’s share of anticipated nuclear-related construction expenditures at DAEC and Kewaunee for 2004 and 2005 are approximately $23 million and $19 million, respectively. These expenditures would be reduced for WP&L if the sale of its interest in Kewaunee is completed prior to the end of 2005.

Refueling Outages and Procurement of Nuclear Fuel — The NMC, acting on behalf of IP&L and the other DAEC owners, purchases uranium and enrichment services for DAEC using a combination of spot market and medium term contracts. This procurement is complete for the spring 2005 DAEC refueling outage. Arrangements for the fabrication of nuclear fuel are in place through the 2011 refueling of DAEC. WPSC purchases uranium concentrates and conversion, enrichment and fabrication services for nuclear fuel assemblies at Kewaunee. Sufficient fuel is in inventory for the fall 2004 refueling outage and additional fuel will be purchased in 2004 for the spring 2006 refueling outage. WPSC’s uranium inventory policy is to maintain sufficient inventory for up to two reloads of fuel. Refer to Note 1(j) of Alliant Energy’s “Notes to Consolidated Financial Statements” for information related to the timing of DAEC and Kewaunee refueling outages.

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Nuclear Liability/Insurance — Liability for nuclear accidents is governed by the Price-Anderson Act of 1988 as amended (Act), which sets a statutory limit of $10.86 billion for liability to the public for a single nuclear power plant incident and requires nuclear power plant operators to provide financial protection for this amount. Financial protection for a nuclear incident is provided through a combination of liability insurance ($300 million) and industry-wide retrospective payment plans ($10.56 billion). Under the industry-wide plan, the owners of each operating licensed nuclear reactor in the U.S. are subject to an assessment in the event of a nuclear incident at any nuclear plant in the U.S. The applicability of the Act to IP&L and WP&L, as existing nuclear power plant owners, continues for the remainder of the operating lives of the plants they own. Alliant Energy expects the U.S. Congress will consider in 2004 coverage under the Act for new nuclear generating stations and increasing the statutory limits for liability to the public for a single nuclear power plant incident and the maximum annual assessment per incident for existing nuclear generating stations.

IP&L and WP&L are members of NEIL, which provides $2.0 billion and $1.8 billion of insurance coverage for DAEC and Kewaunee, respectively, for certain property losses for property damage, decontamination and premature decommissioning. The proceeds from such insurance, however, must first be used for reactor stabilization and site decontamination before they can be used for plant repair and premature decommissioning. NEIL also provides separate coverage for additional expenses incurred during certain outages. Owners of nuclear generating stations insured through NEIL are subject to retroactive premium adjustments if losses exceed accumulated reserve funds. NEIL’s accumulated reserve funds are currently sufficient to more than cover its exposure in the event of a single incident under the primary and excess property damage or additional expense coverages. However, IP&L and WP&L could be assessed if losses exceed the accumulated reserve funds. A summary of IP&L’s and WP&L’s share of maximum possible retrospective liability, property and additional expense assessments is as follows (in millions):

These limits are subject to adjustments for changes in the number of participants and inflation in future years. In the event of a catastrophic loss at DAEC or Kewaunee, the amount of insurance available may not be adequate to cover property damage, decontamination and premature decommissioning. Uninsured losses, to the extent not recovered through rates, would be borne by IP&L or WP&L, as the case may be, and could have a material adverse effect on their respective financial condition and results of operations. IP&L and WP&L are not currently aware of any losses that they believe are likely to result in an assessment.

Spent Nuclear Fuel (High Level Waste) Disposal — NWPA assigned responsibility to the DOE to provide for the permanent disposal of spent nuclear fuel in exchange for payments by contract holders and also requires generators and owners of spent nuclear fuel to provide for interim storage until the fuel is accepted by the DOE. IP&L, on behalf of the DAEC owners, and WPSC, on behalf of the Kewaunee owners, entered into contracts with the DOE for this disposal service and have made the agreed payments to the Nuclear Waste Fund held by the U.S. Treasury. The contracts provided for this service to begin in 1998, however, the DOE has experienced delays in its efforts and acceptance is now expected to occur no earlier than 2010. The DOE is currently proceeding with the licensing phase for a permanent spent fuel storage facility in the Yucca Mountain area of Nevada.

In accordance with their interim storage responsibility, IP&L and WPSC have been and will continue storing spent nuclear fuel on site at DAEC and Kewaunee, respectively, until removal by the DOE to its permanent repository occurs. Interim storage activities at reactor sites, regardless of DOE delays or acceptance schedules, will extend after final reactor shutdown. Construction of a dry cask storage facility by IP&L at DAEC has been completed and transfer of approximately 10 years worth of spent nuclear fuel was completed in November 2003. The dry storage facility provides assurance that both the operating and post-shutdown storage needs of DAEC are satisfied. Kewaunee has sufficient fuel storage capacity to meet its operating storage needs through 2009. Additional storage facilities will be needed at Kewaunee by 2010 for full offload capability for future outages.

In January 2004, IP&L filed a claim against the U.S. government for recovery of damages due to the DOE’s delay in accepting spent nuclear fuel. IP&L is one of a number of utility companies with nuclear assets that has filed similar claims against the DOE for its failure to accept spent nuclear fuel in a timely manner. Determination and adjudication of the specific claim amount depends upon resolution of related court cases involving DOE acceptance rates and acceptance orders of spent nuclear fuel. Alliant Energy does not anticipate resolution of this issue until 2006 at the earliest and cannot currently predict the ultimate outcome.

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Low-Level Radioactive Waste Disposal — The Low-Level Radioactive Waste Policy Amendments Act of 1985 mandates that each state must take responsibility for the storage of low-level radioactive waste produced within its borders. However, disposal facilities located near Barnwell, South Carolina and Clive, Utah continue to accept the low-level waste from DAEC and Kewaunee, thereby minimizing the amount of low-level waste stored on-site and delaying the need for any action by individual states or groups of states to develop new facilities. While it is difficult to predict how long the South Carolina and Utah facilities will continue to accept low-level radioactive waste, DAEC and Kewaunee each have on-site storage capability for at least 10 years of waste generation beyond any date that both facilities might cease to accept such waste.

The costs associated with high- and low-level waste disposal and storage are currently recovered through the rates of Alliant Energy’s utility subsidiaries and therefore do not have a material impact on its results of operations or financial condition.

Additional Nuclear Discussion — Additional discussions of various other nuclear issues relating to DAEC and/or Kewaunee are included in Notes 1(g), 1(j), 3, 9, 10(c), 11(e), 11(f), 12, 17 and 18 of the “Notes to Consolidated Financial Statements.”

Electric Environmental Matters — Alliant Energy is regulated in environmental matters by federal, state and local agencies. Such regulations are the result of a number of environmental laws passed by the U.S. Congress, state legislatures and local governments and enforced by federal, state and local regulatory agencies. The laws impacting Alliant Energy’s operations include, but are not limited to, the Safe Drinking Water Act; Clean Water Act; CAA, as amended by the CAA Amendments of 1990; National Environmental Policy Act; Toxic Substances Control Act; Emergency Planning and Community Right-to-Know Act; Resource Conservation and Recovery Act; Comprehensive Environmental Response, Compensation and Liability Act of 1980, as amended by the Superfund Amendments and Reauthorization Act of 1986; Endangered Species Act; NWPA; Occupational Safety and Health Act; and NEPA. Alliant Energy regularly obtains federal, state and local permits to assure compliance with the environmental protection laws and regulations. Costs associated with such compliance have increased in recent years and are expected to increase moderately in the future. Although Alliant Energy cannot guarantee rate recovery, it anticipates its prudently incurred utility costs will be recovered in future rates.

In February 2003, WP&L’s Columbia Energy Center (Columbia) received a Notice of Violation from the Wisconsin DNR for exceeding limits in its Wisconsin Pollutant Discharge Elimination System (WPDES) permit, which requires Columbia to sample its ash pond discharge and sanitary wastewater plant discharge for various parameters, including acute and chronic toxicity. The WPDES permit issued in 1998 required Columbia to identify what was causing the toxicity in its discharge through an evaluation and to develop a reduction plan. The evaluation was performed and Columbia developed a reduction plan that identified carbon dioxide injection as the treatment to reduce the aluminum concentrations. The Wisconsin DNR did not approve this method of treatment and directed Columbia to revise the reduction plan, at which time Columbia began evaluating a number of treatment alternatives and undertaking a physical evaluation. In November 2003, WP&L submitted a progress report to the Wisconsin DNR for the ash pond toxicity discharges along with plans for the sanitary wastewater treatment plant. In December 2003, a construction permit for the sanitary wastewater treatment plant was submitted to the Wisconsin DNR with an anticipated construction start date in spring 2004. While it is possible that the Wisconsin DNR may subsequently seek to impose a civil penalty for the discharge toxicity, WP&L believes it can resolve this issue to the Wisconsin DNR’s satisfaction in a manner that will not have a material adverse effect on its financial condition or results of operations. Refer to “Legal Proceedings” for further discussion.

Refer to “Liquidity and Capital Resources — Environmental” in MD&A and Note 11(e) of the “Notes to Consolidated Financial Statements” for further discussion of electric environmental matters.

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Alliant Energy Corporation

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Interstate Power and Light Company

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Wisconsin Power and Light Company

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2) DOMESTIC GAS UTILITY OPERATIONS
IP&L and WP&L provide gas service in Iowa, southern and central Wisconsin, southern Minnesota and northern and northwestern Illinois. The number of gas customers and communities served at Dec. 31, 2003 were as follows:

2003 gas utility operations accounted for 21% and 22% of operating revenues and 8% and 13% of operating income for IP&L and WP&L, respectively, which include providing gas services to retail and transportation customers.

In providing gas commodity service to retail customers, Corporate Services administers a diversified portfolio of transportation and storage contracts on behalf of IP&L and WP&L. Transportation contracts with Northern Natural Gas Company (NNG), Natural Gas Pipeline Co. of America (NGPL) and ANR Pipeline (ANR) allow access to gas supplies located in the U.S. and Canada. Arrangements with Firm Citygate Supplies (FCS) provide IP&L and WP&L with gas delivered directly to their service territories. The maximum daily delivery capacity of the individual utilities for 2003 was as follows (in Dths):

IP&L and WP&L maintain purchase agreements with over 30 suppliers of natural gas from all gas producing regions of the U.S. and Canada. The majority of the gas supply contracts are for terms of six months or less, with the remaining supply contracts having terms through 2004. IP&L’s and WP&L’s gas supply commitments are index-based.

In addition to sales of natural gas to retail customers, IP&L and WP&L provide transportation service to commercial and industrial customers by moving customer-owned gas through their distribution systems to the customers’ meters. Revenues are collected for this service pursuant to transportation tariffs.

The gas sales of IP&L and WP&L follow a seasonal pattern. There is an annual base load of gas used for cooking, heating and other purposes, with a large heating peak occurring during the winter season. Natural gas obtained from producers, marketers and brokers, as well as gas in storage, is utilized to meet the peak heating season requirements. Storage contracts allow IP&L and WP&L to purchase gas in the summer, store the gas in underground storage fields and deliver it in the winter. Gas storage met approximately 23% and 24% of IP&L’s and WP&L’s annual gas requirements in 2003, respectively.

Refer to Note 1(i) for information relating to utility natural gas cost recovery, Note 10(a) for information on natural gas derivatives and Note 11(b) for discussion of natural gas commitments in the “Notes to Consolidated Financial Statements.”

Gas Environmental Matters — Refer to Note 11(e) of the “Notes to Consolidated Financial Statements” for discussion of gas environmental matters.

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Alliant Energy Corporation

15

Interstate Power and Light Company

Wisconsin Power and Light Company

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D. INFORMATION RELATING TO NON-REGULATED OPERATIONS

Resources manages a portfolio of wholly-owned subsidiaries and additional investments through distinct platforms: Non-regulated Generation, International, Integrated Services and Other Investments. Resources intends to concentrate its strategic focus on the profitability and cash flow of these platforms and does not currently plan to invest significant capital in the growth of these platforms in the near term other than investments in Non-regulated Generation to support Alliant Energy’s domestic utility business. Refer to “Strategic Overview — Updated Strategic Plan” in MD&A for further discussion.

Non-regulated Generation — was originally formed to acquire, develop and operate a portfolio of competitive power generating assets across the U.S., focusing primarily on the Upper Midwest. In February 2003, Resources purchased a 309- MW, non-regulated, tolled, natural gas-fired power plant in Neenah, Wisconsin for $109 million, which Resources financed with a $73 million 8-year secured credit agreement ($55 million of borrowings were outstanding at Dec. 31, 2003), which is non-recourse to Alliant Energy. The entire power output of the facility is sold under contract to Milwaukee-based We Energies through June 2008. In December 2003, Alliant Energy announced that Non-regulated Generation will refine its focus to support the development, financing and construction of generation to meet the needs of Alliant Energy’s domestic utility business and will defer pursuit of other new non-regulated generation projects, other than potential projects to utilize existing equipment held by Non-regulated Generation, or further acquisitions of existing tolled generation in the near term.

International — has invested in energy generation and distribution companies and projects in select growing markets. Currently, International has investments in Brazil, China and New Zealand. International has developed local partnerships to obtain knowledge of each local market’s business trends and customs. Refer to Note 9 of Alliant Energy’s “Notes to Consolidated Financial Statements” for additional information related to Alliant Energy’s investments in foreign entities.

Integrated Services — provides a wide range of energy and environmental services for commercial, industrial, institutional, educational and governmental customers. It offers large energy users an array of services to maximize customers’ productivity, profitability and energy efficiency, and provides solutions for waste remediation and other environmental engineering and consulting services. Integrated Services includes: Cogenex Corporation (Cogenex), Industrial Energy Applications, Inc. (IEA), Heartland Energy Group, Inc. (HEG), RMT, Inc. (RMT) and Alliant Energy Integrated Services Company — Energy Solutions L.L.C. (Energy Solutions). Cogenex installs energy efficient equipment for business customers. IEA provides on-site energy services with small standby generators. HEG owns an interest in NG Energy, a gas marketing business, and owns several natural gas and oil gathering systems in Texas. RMT is an environmental and engineering consulting company that serves clients nationwide in a variety of industrial market segments and specializes in consulting on solid and hazardous waste management, site remediation, ground water quality monitoring and detection, and air quality control. RMT is marketing SmartBurn™, which is a large-scale emissions-reducing program for coal-burning facilities, to other U.S. companies. Energy Solutions provides energy consulting services.

Other Investments — represents various additional investments of Resources. Transportation is a holding company whose wholly-owned subsidiaries include the Cedar Rapids and Iowa City Railway Company (CRANDIC), which is a short-line railway that provides freight service between Cedar Rapids and Iowa City; IEI Barge Services, Inc., which provides barge terminal and hauling services on the Mississippi River; and Williams Bulk Transfer Inc. and Transfer Services, Inc., which provide transfer and storage services. Synfuel has an equity interest in a synthetic fuel processing facility. The synthetic fuel project generates operating losses at its fuel processing facility, which are more than offset by tax credits and the tax benefit of the losses generated. Investments is a holding company with direct and indirect interests in various small real estate and economic development ventures, primarily concentrated in Cedar Rapids, Iowa, and holds other passive investments, including an equity interest in McLeod, an integrated telecommunications and services provider. Resources also has a loan to a development project in Mexico, several modest investments in emerging energy technology businesses and approximately 6% of the outstanding shares of WPC that it intends to sell in 2004.

E. DISCLOSURE CONCERNING WEBSITE ACCESS TO REPORTS
Alliant Energy makes its periodic and current reports, and amendments to those reports, available, free of charge, on its website at www.alliantenergy.com/investors on the same day as such material is electronically filed with, or furnished to, the SEC. Alliant Energy is not including the information contained on its website as a part of, or incorporating it by reference into, this Annual Report on Form 10-K.

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ITEM 2. PROPERTIES

IP&L
IP&L’s principal electric generating stations at Dec. 31, 2003, were as follows:

All KWs shown below represent the 2003 summer generating capability.

IP&L owns 7,078 miles of electric transmission lines and 795 substations, substantially all located in Iowa, Minnesota and Illinois. IP&L’s principal properties are suitable for their intended use and substantially all are held subject to the liens of indentures relating to its bonds. Refer to “Strategic Overview — Updated Strategic Plan” in MD&A for discussion of Alliant Energy’s domestic generation plan.

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WP&L
WP&L’s principal electric generating stations at Dec. 31, 2003, were as follows:

All KWs shown below represent the 2003 summer generating capability.

WP&L owns 162 distribution substations located adjacent to the communities served, substantially all located in Wisconsin. WP&L's transmission assets were transferred to ATC in 2001. WP&L's principal properties are suitable for their intended use and substantially all are held subject to the lien of its First Mortgage Bond indenture. Refer to "Strategic Overview - Updated Strategic Plan" in MD&A for further discussion of Alliant Energy's domestic generation plan.

Resources
Resources’ principal properties at Dec. 31, 2003 were as follows:

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ITEM 3. LEGAL PROCEEDINGS

Alliant Energy
In 2000, Alliant Energy and WP&L filed a federal lawsuit seeking declaratory relief regarding whether certain provisions of WUHCA are unconstitutional as a violation of the interstate commerce and equal protection provisions of the U.S. Constitution. Alliant Energy and WP&L challenged the provisions of WUHCA that restrict ownership in utility holding companies, limit the investments those companies can make, place significant restrictions on companies that invest in Wisconsin utility holding companies and impose an asset cap on non-utility investments. The district court ultimately dismissed the case on summary judgment grounds in May 2002. Alliant Energy and WP&L appealed the district court’s decision to the 7^th Circuit Court of Appeals which ruled in May 2003 that it is unconstitutional to require public utility holding companies with Wisconsin utility subsidiaries to be incorporated in the state of Wisconsin. The remaining WUHCA provisions that Alliant Energy challenged were upheld as constitutional. Alliant Energy filed a petition with the U.S. Supreme Court asking it to review the case. The Supreme Court decided in January 2004 not to review the case which effectively ended this lawsuit.

Alliant Energy received an adverse ruling in 1999 from a U.S. district court dealing with an income tax refund claim Alliant Energy filed relating to capital losses disallowed under audit by the IRS. The district court also disallowed certain related deductions allowed by the IRS to reduce a tax refund due to Alliant Energy related to another tax issue. Alliant Energy appealed the district court’s ruling and the government appealed the decision that led to the tax refund due to Alliant Energy. In June 2001, the U.S. Court of Appeals for the 8^th Circuit ruled in Alliant Energy’s favor with respect to both tax issues and ultimately remanded the case back to the district court for entry of judgment. The federal government decided not to pursue the 8^th Circuit’s ruling in favor of Alliant Energy with respect to these two tax issues. As a result, Alliant Energy recorded the applicable tax benefit and interest income in 2001 related to these events. An additional potential refund of approximately $14 million, plus interest, was also contested by the government, resulting in the district court ruling in favor of the government in July 2002. Alliant Energy was not successful in its appeal of this decision. However, the adverse decision by the 8^th Circuit did not result in Alliant Energy recording any charges to earnings, as the refund sought represented a gain contingency. As a result, Alliant Energy will receive a tax refund of approximately $20 million in 2004, which includes interest.

In the fourth quarter of 2003, the Wisconsin Environmental Law Advocates (WELA) filed a complaint in the U.S. District Court for the Western District of Wisconsin against WP&L and Alliant Energy alleging violations of the federal Clean Water Act at the Columbia generating station. The complaint seeks certain upgrades to Columbia’s wastewater treatment program, as well as unspecified penalties and attorney fees. In addition, the Wisconsin DNR has been pursuing enforcement of this same matter and has recently referred the matter to the Wisconsin Department of Justice (WDOJ). To date, no action has been filed by the State of Wisconsin; however, Alliant Energy expects a complaint to be filed in due course. Alliant Energy, WDOJ and WELA have initiated settlement discussions. Alliant Energy believes that the total cost to resolve any potential penalties and implement any required upgrades in this matter will not be material. Refer to "Electric Environmental Matters" in "Business" for further discussion.

IP&L — None.

WP&L — Refer to “Legal Proceedings — Alliant Energy” for information regarding joint Alliant Energy and WP&L lawsuits.

Environmental Matters
Additional information required by Item 3 with regards to environmental matters is included in “C. Information Relating to Domestic Utility Operations — 1) Domestic Electric Utility Operations” in “Business,” “Liquidity and Capital Resources — Environmental” in MD&A and Note 11(e) of the “Notes to Consolidated Financial Statements,” which information is incorporated herein by reference.

Rate Matters
The information required by Item 3 with regards to rate matters is included in "Business," Note 2 of Alliant Energy’s “Notes to Consolidated Financial Statements” and “Rates and Regulatory Matters” in MD&A, which information is incorporated herein by reference.

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ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
None.

EXECUTIVE OFFICERS OF THE REGISTRANTS
The executive officers of Alliant Energy, IP&L and WP&L as of the date of this filing are as follows (figures following the names represent the officer’s age as of Dec. 31, 2003):

Executive Officers of Alliant Energy
Erroll B. Davis, Jr., 59, was elected Chairman of the Board effective April 2000, has served as Chief Executive Officer (CEO) since 1990 and has been a board member since 1988. He previously also served as President from 1990 through 2003.
William D. Harvey, 54, was elected President and Chief Operating Officer (COO) effective January 2004. He previously served as Executive Vice President (EVP)-Generation since 1998.
Eliot G. Protsch, 50, was elected Senior EVP and Chief Financial Officer (CFO) effective January 2004. He previously served as EVP and CFO since September 2003 and as EVP-Energy Delivery from 1998 to September 2003.
James E. Hoffman, 50, was elected EVP-Business Development effective April 1998.
Barbara J. Swan, 52, was elected EVP and General Counsel effective October 1998.
Pamela J. Wegner, 56, was elected EVP-Strategy and Performance effective January 2004. She previously served as EVP-Shared Solutions since 1998.
Thomas L. Aller, 54, was elected Senior Vice President-Energy Delivery effective January 2004. He previously served as interim EVP-Energy Delivery since September 2003 and as Vice President (VP)-Investments at Resources from 1998 to 2003.
Thomas L. Hanson, 50, was elected VP and Treasurer effective April 2002. He previously served as Managing Director-Generation Services since 2001 and General Manager-Business and Financial Performance, Generation from 1998 to 2001.
John E. Kratchmer, 41, was elected VP-Controller and Chief Accounting Officer (CAO) effective October 2002. He previously served as Corporate Controller and Chief Accounting Officer since October 2000 and Assistant Controller from 1998 to 2000.

None of the executive officers listed above is related to any member of the Board of Directors or nominee for director or any other executive officer. Mr. Davis has an employment agreement with Alliant Energy pursuant to which his term of office is established. All other executive officers have no definite terms of office and serve at the pleasure of the Board of Directors.

Executive Officers of IP&L
Erroll B. Davis, Jr., 59, was elected Chairman of the Board effective April 2000 and CEO effective April 1998. Mr. Davis is also an officer of Alliant Energy and WP&L.
William D. Harvey, 54, was elected COO effective January 2004. Mr. Harvey is also an officer of Alliant Energy and WP&L.
Thomas L. Aller, 54, was elected President effective January 2004. Mr. Aller is also an officer of Alliant Energy and WP&L.
Eliot G. Protsch, 50, was elected CFO effective January 2004. He previously served as EVP and CFO since September 2003 and also as President from 1998 through 2003. Mr. Protsch is also an officer of Alliant Energy and WP&L.
Barbara J. Swan, 52, was elected EVP and General Counsel effective October 1998. Ms. Swan is also an officer of Alliant Energy and WP&L.
Thomas L. Hanson, 50, was elected VP and Treasurer effective April 2002. Mr. Hanson is also an officer of Alliant Energy and WP&L.
John E. Kratchmer, 41, was elected VP-Controller and CAO effective October 2002. Mr. Kratchmer is also an officer of Alliant Energy and WP&L.

None of the executive officers listed above is related to any member of the Board of Directors or nominee for director or any other executive officer. Mr. Davis has an employment agreement with Alliant Energy pursuant to which his term of office is established. All other executive officers have no definite terms of office and serve at the pleasure of the Board of Directors.

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Executive Officers of WP&L
Erroll B. Davis, Jr., 59, was elected Chairman of the Board effective April 2000 and CEO effective April 1998. Mr. Davis is also an officer of Alliant Energy and IP&L.
William D. Harvey, 54, was elected COO effective January 2004. He previously served as President since 1998. Mr. Harvey is also an officer of Alliant Energy and IP&L.
Barbara J. Swan, 52, was elected President effective January 2004. She previously served as EVP and General Counsel since 1998. Ms. Swan is also an officer of Alliant Energy and IP&L.
Eliot G. Protsch, 50, was elected CFO effective January 2004. He previously served as EVP and CFO since September 2003. Mr. Protsch is also an officer of Alliant Energy and IP&L.
Thomas L. Aller, 54, was elected Senior VP-Energy Delivery effective January 2004. Mr. Aller is also an officer of Alliant Energy and IP&L.
Thomas L. Hanson, 50, was elected VP and Treasurer effective April 2002. Mr. Hanson is also an officer of Alliant Energy and IP&L.
John E. Kratchmer, 41, was elected VP-Controller and CAO effective October 2002. Mr. Kratchmer is also an officer of Alliant Energy and IP&L.

None of the executive officers listed above is related to any member of the Board of Directors or nominee for director or any other executive officer. Mr. Davis has an employment agreement with Alliant Energy pursuant to which his term of office is established. All other executive officers have no definite terms of office and serve at the pleasure of the Board of Directors.

PART II

ITEM 5. MARKET FOR REGISTRANTS' COMMON EQUITY AND RELATED STOCKHOLDER MATTERS

Alliant Energy’s common stock trades on the New York Stock Exchange under the symbol “LNT.” Quarterly sales price ranges and dividends with respect to Alliant Energy’s common stock were as follows:

Stock closing price at Dec. 31, 2003: $24.90

Although Alliant Energy’s practice has been to pay cash dividends on its common stock quarterly, the timing of payment and amount of future dividends are necessarily dependent upon future earnings, capital requirements, general financial condition, general business conditions, the ability of Alliant Energy’s subsidiaries to pay dividends and other factors.

At Dec. 31, 2003, there were approximately 53,231 holders of record of Alliant Energy’s stock, including holders through Alliant Energy’s Shareowner Direct Plan.

Alliant Energy is the sole common shareowner of all 13,370,788 shares of IP&L common stock currently outstanding. During 2003 and 2002, IP&L paid dividends on its common stock of $89 million and $82 million, respectively, to its parent. In accordance with the IUB order authorizing the IP&L merger, IP&L must inform the IUB if its common equity ratio falls below 42% of total capitalization. Alliant Energy is the sole common shareowner of all 13,236,601 shares of WP&L common stock currently outstanding. During 2003 and 2002, WP&L paid dividends on its common stock of $71 million and $60 million, respectively, to its parent. In its December 2003 rate order, the PSCW stated that WP&L may not pay annual common stock dividends, including pass-through of subsidiary dividends, in excess of $89 million to Alliant Energy if WP&L’s actual average common equity ratio, on a regulatory financial basis, is or will fall below the authorized level of 54.01%. WP&L’s dividends are also restricted to the extent that such dividend would reduce the common stock equity ratio to less than 25%. IP&L and WP&L each have common stock dividend payment restrictions based on their respective bond indentures and the terms of their outstanding preferred stock. At Dec. 31, 2003, IP&L and WP&L were in compliance with all such dividend restrictions.

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ITEM 6. SELECTED FINANCIAL DATA

Alliant Energy Corporation

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(1)     Refer to “IP&L Results of Operations” in MD&A for a discussion of the 2003, 2002 and 2001 results of operations.

Alliant Energy is the sole common shareowner of all 13,370,788 shares of IP&L’s common stock outstanding. As such, earnings per share data is not disclosed herein.