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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

For the year ended December 31, 2004

Or

For the transition period from              to             

Commission File No. 333-57156

MEWBOURNE ENERGY PARTNERS 01-A, L.P.

Registrant’s Telephone Number, including area code: (903) 561-2900

Securities registered pursuant to Section 12(b) of the Act: None.

Securities registered pursuant to Section 12(g) of the Act:

Limited and general partnership interest $1,000 per interest

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 of 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) has been subject to such filing requirements for the past 90 days.    x  Yes    ¨  No

No market currently exists for the limited and general partnership interest of the registrant. Based on original purchase price the aggregate market value of limited and general partnership interest owned by non-affiliates of the registrant is $15,000,000.

The following documents are incorporated by reference into the indicated parts of this Annual Report on Form 10-K; Part of the information called for by Part IV of the Annual Report on Form 10-K is incorporated by reference from the Registrant’s Registration Statement on Form S-1, File No. 333-57156.

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PART I

ITEM 1. Business

Mewbourne Energy Partners 01-A, L.P. (the “Registrant”) is a limited partnership organized under the laws of the State of Delaware on February 23, 2001 (date of inception). Its managing general partner is Mewbourne Development Corporation, a Delaware corporation (“MD”).

A Registration Statement was filed pursuant to the Securities Act of 1933, as amended, registering limited partnership interests aggregating $6,000,000 and $24,000,000 in general partnership interests in a series of Delaware limited partnerships formed under Mewbourne Energy 01-02 Drilling Programs. The Registrant was declared effective by the Securities and Exchange Commission on June 12, 2001. On August 28, 2001, the offering of limited and general partnership interests in the Registrant was closed, with interests aggregating $15,000,000 being sold to 569 subscribers of which $13,513,000 were sold to 528 subscribers as general partner interests and $1,487,000 were sold to 41 subscribers as limited partner interests.

The Registrant engages primarily in oil and gas development and production and is not involved in any other industry segment. See the selected financial data in Item 6 and the financial statements in Item 8 of this report for a summary of the Registrant’s revenue, income and identifiable assets.

The sale of crude oil and natural gas produced by the Registrant will be affected by a number of factors that are beyond the Registrant’s control. These factors include the price of crude oil and natural gas, the fluctuating supply of and demand for these products, competitive fuels, refining, transportation, extensive federal and state regulations governing the production and sale of crude oil and natural gas, and other competitive conditions. It is impossible to predict with any certainty the future effect of these factors on the Registrant.

The Registrant does not have long-term contracts with purchasers of its crude oil or natural gas. The market for crude oil is such that the Registrant anticipates it will be able to sell all the crude oil it can produce. Natural gas will be sold to local distribution companies, gas marketers and end users on the spot market. The spot market reflects immediate sales of natural gas without long-term contractual commitments. The future market condition for natural gas cannot be predicted with any certainty, and the Registrant may experience delays in marketing natural gas production and fluctuations in natural gas prices.

Many aspects of the Registrant’s activities are highly competitive including, but not limited to, the acquisition of suitable drilling prospects and the procurement of drilling and related oil field equipment, and are subject to governmental regulation, both at Federal and state levels. The Registrant’s ability to compete depends on its financial resources and on the managing general partner’s staff and facilities, none of which are significant in comparison with those of the oil and gas exploration, development and production industry as a whole. Federal and state regulation of oil and gas operations generally includes drilling and spacing of wells on producing acreage, the imposition of maximum allowable production rates, the taxation of income and other items, and the protection of the environment.

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The Registrant does not have any employees of its own. MD is responsible for all management functions. Mewbourne Oil Company (“MOC”), a wholly owned subsidiary of Mewbourne Holdings, Inc., which is also the parent of the Registrant’s managing general partner, has been appointed Program Manager and is responsible for activities in accordance with a Drilling Program Agreement entered into by the Registrant, MD and MOC. At March 29, 2005, MOC employed 150 persons, many of whom dedicated a part of their time to the conduct of the Registrant’s business during the period for which this report is filed.

The production of oil and gas is not considered subject to seasonal factors although the price received by the Registrant for natural gas sales will generally tend to increase during the winter months. Order backlog is not pertinent to the Registrant’s business.

ITEM 2. Properties

The Registrant’s properties consist primarily of leasehold interests in properties on which oil and gas wells-in-progress are located. Such property interests are often subject to landowner royalties, overriding royalties and other oil and gas leasehold interests.

Fractional working interests in developmental oil and gas prospects located primarily in the Anadarko Basin of Western Oklahoma, the Texas Panhandle, and the Permian Basin of New Mexico and West Texas, were acquired by the Registrant, resulting in the Registrant’s participation in the drilling of oil and gas wells. At December 31, 2004, 39 wells had been drilled and were productive and 5 wells were drilled and abandoned. Of the 39 productive wells, 38 were producing and one was plugged and abandoned at December 31, 2004. The following table summarizes the Registrant’s drilling activity for the years ended December 31, 2004, 2003 and 2002:

Reserve estimates were prepared by Forrest A Garb & Associates, Inc., the Registrant’s independent petroleum consultants, in accordance with guidelines established by the Securities and Exchange Commission.

ITEM 3. Legal Proceedings

The Registrant is not aware of any pending legal proceedings to which it is a party.

ITEM 4. Submission of Matters to a Vote of Security Holders

No matter was submitted to a vote of security holders during the period ended December 31, 2004 covered by this report.

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PART II

ITEM 5. Market for Registrant’s Common Equity and Related Stockholder Matters

At March 29, 2005, the Registrant had 15,000 outstanding limited and general partnerships interests held of record by 569 subscribers. There is no established public or organized trading market for the limited and general partner interests.

Revenues which, in the sole judgment of the managing general partner, are not required to meet the Registrant’s obligations will be distributed to the partners at least quarterly in accordance with the Registrant’s Partnership Agreement. Distributions made to limited and general partners during the years ended December 31, 2004, 2003 and 2002, were $2,184,367, $3,807,500 and $2,539,000, respectively.

ITEM 6. Selected Financial Data

The following table sets forth selected financial data for the years ended December 31, 2004, 2003, 2002 and 2001:

ITEM 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

General

Mewbourne Energy Partners 01-A, L.P., (the “Registrant”) was organized as a Delaware limited partnership on February 23, 2001. The offering of limited and general partnership interests began June 12, 2001 as a part of an offering registered under the name Mewbourne Energy Partners 01-02 Drilling Programs. The offering of limited and general partner interests in the Registrant concluded August 28, 2001, with total investor partner contributions of $15,000,000.

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The Registrant was formed to engage primarily in the business of drilling development wells, to produce and market crude oil and natural gas produced from such properties, to distribute any net proceeds from operations to the general and limited partners and to the extent necessary, acquire leases which contain drilling prospects. The economic life of the Registrant depends on the period over which the Registrant’s oil and gas reserves are economically recoverable.

Results of Operations

The following table sets forth certain operating data for the years ended December 31, 2004, 2003 and 2002:

Year ended December 31, 2004 compared to the year ended December 31, 2003

Oil and natural gas sales. As shown in the table above, total oil and gas sales decreased $1,540,274 (34.2%) for the year ended December 31, 2004 as compared to the year ended December 31, 2003. Of this decrease, $349,244 and $1,562,180, respectively, were related to decreases in volumes of oil and gas sold. Volumes of oil and gas sold decreased 9,169 bbls of oil and 289,617 mcf of gas for the year ended December 31, 2004 as compared to the year ended December 31, 2003. The decrease in volumes of oil sold was primarily due to a substantial decline in the production of two wells. The decrease in volumes of gas sold was primarily due to (i) normal declines in production and (ii) a substantial decline in the production of two wells, and the decrease was partially offset by the addition of one well late in 2003. The wells with a substantial decline in production are not expected to return to previously high levels of production. These decreases were partially offset by increases of $108,221 and $262,929, respectively, related to increases in the average prices of oil and gas sold. Average oil and gas prices increased to $38.09 per bbl and $5.39 per mcf for the year ended December 31, 2004 from $30.15 per bbl and $5.06 per mcf for the year ended December 31, 2003.

Interest income. Interest income decreased from $3,914 in 2003 to $475 in 2004 due to expenditures for the drilling of oil and gas wells, which resulted in a decrease of capital available for investments.

Lease operating expense and production taxes. Lease operating expense was $392,365 in 2003 and was comparative to $390,032 in 2004. Production taxes decreased from $362,687 in 2003 to $232,845 in 2004. Production taxes decreased due to decreased oil and gas revenues for 2004.

Depreciation, depletion and amortization. Depreciation, depletion and amortization decreased from $1,085,542 in 2003 to $703,250 in 2004. The decrease is primarily due to the decline in production volumes and the decreased net full-cost pool. There were no cost ceiling write-downs for 2004 or 2003.

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Year ended December 31, 2003 compared to the year ended December 31, 2002

Oil and natural gas sales. As shown in the table above, total oil and gas sales increased $1,019,970 (29.3%) for the year ended December 31, 2003 as compared to the year ended December 31, 2002. Of this increase, $25,346 and $2,490,180, respectively, were related to increases in the average prices of oil and gas sold. Average oil and gas prices increased to $30.15 per bbl and $5.06 per mcf for the year ended December 31, 2003 from $26.10 per bbl and $2.89 per mcf for the year ended December 31, 2002. Volumes of oil sold increased 7,371 bbls of oil for the year ended December 31, 2003 as compared to the year ended December 31, 2002 resulting in increased sales of $222,224. The increase in volumes of oil sold was primarily due to the addition of one well. These increases were partially offset by a decrease of $1,717,780 related to the decrease in volumes of gas sold. Volumes of gas sold decreased 340,211 mcf of gas for the year ended December 31, 2003 as compared to the year ended December 31, 2002. The decrease in volumes of gas sold was primarily due to (i) normal declines in production and (ii) a substantial decline in the production of two wells. The wells with a substantial decline in production are not expected to return to previously high levels of production.

Interest income. Interest income decreased from $37,271 in 2002 to $3,914 in 2003 due to expenditures for the drilling of oil and gas wells, which resulted in a decrease of capital available for investments.

Lease operating expense and production taxes. Lease operating expense increased from $278,417 in 2002 to $392,365 in 2003. Lease operating expense increased due to the increase in the number of wells producing in 2003 and the workover operations of one Oklahoma well in 2003. Production taxes increased from $276,618 in 2002 to $362,687 in 2003. Production taxes increased due to increased oil and gas revenues for 2003.

Depreciation, depletion and amortization. Depreciation, depletion and amortization decreased from $1,439,205 in 2002 to $1,085,542 in 2003. The decrease is primarily due to the decline in production volumes and the decreased net full-cost pool. There was no cost ceiling write-down for 2003 compared to $2,152,691 for 2002.

Liquidity and capital resources

Net cash increased by $221 during the year ended December 31, 2004. Cash flows from operating activities were offset by funds utilized primarily for cash distributions to partners. All wells for which funds have been committed have been drilled. Any incidental future capital expenditures incurred will be paid with revenues generated through oil and gas sales. Revenues which, in the sole judgment of the managing general partner, are not required to meet the Registrant’s obligations will be distributed to the partners at least quarterly in accordance with the Registrant’s Partnership Agreement.

Critical Accounting Policies

The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Significant estimates inherent in the Registrant’s financial statements include the estimate of oil and gas reserves and future abandonment costs as reported in the footnotes to the financial statements. Changes in oil and gas prices and the changes in production estimates could have a significant effect on reserve estimates. The reserve estimates directly impact the computation of depreciation, depletion, and amortization, asset retirement obligation, and the ceiling test for the Registrant’s oil and gas properties.

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The Registrant follows the full-cost method of accounting for its oil and gas activities. Under the full-cost method, all productive and non-productive costs incurred in the acquisition, exploration and development of oil and gas properties are capitalized. Depreciation, depletion and amortization of oil and gas properties subject to amortization is computed on the units-of-production method based on the proved reserves underlying the oil and gas properties. Oil and gas properties are subject to an quarterly ceiling test that limits such costs to the aggregate of that present value of future net cash flows of proved reserves and the lower of cost or fair value of unproved properties. The present value of future net cash flows has been prepared assuming year-end selling prices, year-end development and production costs and a 10 percent annual discount rate.

All financing activities of the Registrant are reported in the financial statements. The Registrant does not engage in any off-balance sheet financing arrangements.

On September 28, 2004 the Security and Exchange Commission issued Staff Accounting Bulletin No. 106 (SAB No. 106). The interpretations in SAB No. 106 express the staff’s views regarding the application of FASB Statement No. 143, “Accounting for Asset Retirement Obligations”, by oil and gas producing companies following the full cost accounting method.

Under Statement 143, the Partnership must recognize a liability for an asset retirement obligation at fair value in the period in which the obligation is incurred, if a reasonable estimate of fair value can be made. The Partnership also must initially capitalize the associated asset retirement costs by increasing its full cost pool by the same amount as the liability. Under the full cost method of accounting, the Partnership calculates quarterly a limitation on capitalized costs, i.e., the full cost ceiling of our oil and natural gas properties and any asset retirement costs capitalized pursuant to Statement 143 are subject to the full cost ceiling limitation. SAB No. 106 provides that after adoption of Statement 143, the future cash outflows associated with settling asset retirement obligations that have been accrued on the balance sheet should be excluded from the computation of the present value of estimated future net revenues for purposes of the full cost ceiling calculation. Currently, the future cash outflows associated with settling asset retirement obligations are included in the computation of the present value of estimated future reserves for purposes of the full cost ceiling calculation. The amount of the full cost pool subject to the ceiling test is decreased by the amount of the asset retirement obligation liability. The effect of this interpretation will increase the ceiling as it relates to the Partnership’s full cost pool and will increase the amount of the full cost pool that is subject to the ceiling. The Partnership does not expect SAB 106 to have a material impact on the calculation of its full cost ceiling test.

Subsequent to the adoption of Statement 143, the estimated dismantlement and abandonment costs for the Partnership’s oil and natural gas properties that have been capitalized have been included in the costs used when calculating the depreciation, depletion and amortization (DD&A) rate used to amortize the properties. Future development activities on proved reserves may result in additional asset retirement obligations when such activities are performed and the associated asset retirement costs will be capitalized at that time. Under the interpretations in SAB No. 106 to the extent that estimated dismantlement and abandonment costs, net of estimated salvage values, have not been capitalized for future development activity, the Partnership will be required to estimate the amount of dismantlement and abandonment costs that will be incurred and include those amounts in the costs to be amortized. The Partnership has not yet determined the full impact this will have on DD&A but it is not expected to be material.

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Asset Retirement Obligations

On January 1, 2003, the Partnership adopted Statement of Financial Accounting Standard No. 143 (“FAS 143”), “Accounting for Asset Retirement Obligations.” This statement changes the financial accounting and reporting obligations associated with the retirement and disposal of long-lived assets, including the Partnership’s oil and gas properties, and the associated asset retirement costs.

A liability for the estimated fair value of the future plugging and abandonment costs is recorded with a corresponding increase in the full cost pool at the time a new well is drilled. Depreciation expense associated with estimated plugging and abandonment costs is recognized in accordance with the full cost methodology.

The Partnership estimates a liability for plugging and abandonment costs based on historical experience and estimated well life. The liability is discounted using the credit-adjusted risk-free rate. Revisions to the liability could occur due to changes in well plugging and abandonment costs or well useful lives, or if federal or state regulators enact new well restoration requirements. The Partnership recognizes accretion expense in connection with the discounted liability over the remaining life of the well.

Upon adoption of FAS 143 on January 1, 2003, the Partnership recorded a discounted liability of $297,742, increased the net full cost pool by $346,332 and recognized a one-time cumulative effect adjustment of $(48,590).

The following pro forma data summarizes our net loss as if the provisions of SFAS 143 had been applied as of January 1, 2001:

A reconciliation of the Partnership’s liability for well plugging and abandonment costs for the years ended December 31, 2004 and 2003, is as follows:

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Organization and Related Party Transactions

The Partnership was organized on February 23, 2001. Mewbourne Development Corporation (MD) is managing general partner and Mewbourne Oil Company (MOC) is operator of oil and gas properties owned by the Partnership. Mewbourne Holdings, Inc. is the parent of both MD and MOC. Substantially all transactions are with MD and MOC.

In the ordinary course of business, MOC will incur certain costs that will be passed on to well owners of the well on which the costs were incurred. The partnership will receive their portion of these costs based upon their ownership in each well incurring the costs. These costs are referred to as Operator charges and are standard and customary in the oil and gas industry. Operator charges include recovery of gas marketing costs, fixed rate overhead, supervision, pumping, and equipment furnished by the Operator. Reimbursement to MOC for operator charges totaled $191,754, $227,868 and $814,743 for the years ended December 31, 2004, 2003 and 2002, respectively. Operator charges are billed in accordance with the program and partnership agreements.

In general, during any particular calendar year, the total amount of administrative expenses allocated to the Partnership shall not exceed the greater of (a) 3.5% of the Partnership’s gross revenue from the sale of oil and natural gas production during each year (calculated without any deduction for operating costs or other costs and expenses) or (b) the sum of $50,000 plus .25% of the capital contributions of limited and general partners. Under this arrangement, $110,141, $165,292 and $88,433 were allocated to the Partnership during the years ended December 31, 2004, 2003 and 2002, respectively.

The Partnership participates in oil and gas activities through a Drilling Program Agreement, the Program. The Partnership and MD are parties to the Program agreement. The costs and revenues of the Program are allocated to MD and the Partnership as follows:

The Partnership’s financial statements reflect its respective proportionate interest in the Program.

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ITEM 8. Financial Statements and Supplementary Data

The required financial statements of the Registrant are contained in a separate section of this report following the signature attestation. See “Item 15. Exhibits, Financial Statement Schedules and Reports on Form 8-K”.

ITEM 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

ITEM 9A. Controls and Procedures

Mewbourne Development Corporation (“MDC”), the Managing General Partner of the Partnership, maintains a system of controls and procedures designed to provide reasonable assurance as to the reliability of the financial statements and other disclosures included in this report, as well as to safeguard assets from unauthorized use or disposition. Within 90 days prior to the filing of this report, MDC’s Chief Executive Officer and Chief Financial Officer have evaluated the effectiveness of the design and operation of our disclosure controls and procedures with the assistance and participation of other members of management. Based upon that evaluation, MDC’s Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures are effective for gathering, analyzing and disclosing the information the Partnership is required to disclose in the reports it files under the Securities Exchange Act of 1934 within the time periods specified in the SEC’s rules and forms. There have been no significant changes in MDC’s internal controls or in other factors which could significantly affect internal controls subsequent to the date MDC carried out its evaluation.

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PART III

ITEM 10. Directors and Executive Officers of the Registrant

The Registrant does not have any officers or directors. Under the Registrant’s Partnership Agreement, the Registrant’s managing partner, MD, is granted the exclusive right and full authority to manage, control and administer the Registrant’s business. MD is a wholly owned subsidiary of Mewbourne Holdings, Inc.

Set forth below are the names, ages and positions of the directors and executive officers of MD, the Registrant’s managing general partner. Directors of MD are elected to serve until the next annual meeting of stockholders or until their successors are elected and qualified.

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Curtis W. Mewbourne, age 69, formed Mewbourne Holdings, Inc. in 1965 and serves as Chairman of the Board and President of Mewbourne Holdings, MD and MOC. He has operated as an independent oil and gas producer for the past 40 years. Mr. Mewbourne received a Bachelor of Science Degree in Petroleum Engineering from the University of Oklahoma in 1957. Mr. Mewbourne is the father of Dorothy M. Cuenod, Ruth M. Buckley, and Julie M. Greene and the father-in-law of J. Roe Buckley.

J. Roe Buckley, age 42, joined Mewbourne Holdings, Inc. in July, 1990 and serves as Vice President and Chief Financial Officer of both MD and MOC. Mr. Buckley was employed by Mbank Dallas from 1985 to 1990 where he served as a commercial loan officer. He received a Bachelor of Arts in Economics from Sewanee in 1984. Mr. Buckley is the son-in-law of Curtis W. Mewbourne and is married to Ruth M. Buckley. He is also the brother-in-law of Dorothy M. Cuenod and Julie M. Greene.

Alan Clark, age 52, joined Mewbourne Oil Company in 1979 and serves as Treasurer and Controller of both MD and MOC. Prior to joining MOC, Mr. Clark was employed by Texas Oil and Gas Corporation as Assistant Supervisor of joint interest accounting from 1976 to 1979. Mr. Clark has served in several accounting/finance positions with Mewbourne Oil Company prior to his current assignment. Mr. Clark received a Bachelor of Business Administration from the University of Texas at Arlington.

Michael F. Shepard, age 58, joined Mewbourne Oil Company in 1986 and serves as Secretary and General Counsel of MD. He has practiced law exclusively in the oil and gas industry since 1979 and formerly was counsel with Parker Drilling Company and its Perry Gas subsidiary for seven years. Mr. Shepard holds the Juris Doctor degree from the University of Tulsa where he received the National Energy Law and Policy Institute award as the outstanding graduate in the Energy Law curriculum. He received a B.A. degree, magna cum laude, from the University of Massachusetts in 1976. Mr. Shepard is a member of the bar in Texas and Oklahoma.

Dorothy Mewbourne Cuenod, age 44, received a B.A. degree in Art History from The University of Texas and a Masters of Business Administration Degree from Southern Methodist University. Since 1984 she has served as a Director and Assistant Secretary of both MD and MOC. Ms. Cuenod is the daughter of Curtis W. Mewbourne and is the sister of Ruth M. Buckley and Julie M. Greene. She is also the sister-in-law of J. Roe Buckley.

Ruth Mewbourne Buckley, age 43, received a Bachelor of Science Degree in both Engineering and Geology from Vanderbilt University. Since 1987 she has served as a Director and Assistant Secretary of both MD and MOC. Ms. Buckley is the daughter of Curtis W. Mewbourne and is the sister of Dorothy M. Cuenod and Julie M. Greene. She is also the wife of J. Roe Buckley.

Julie Mewbourne Greene, age 41, received a B.A. degree in Business Administration from The University of Oklahoma. Since 1988 she has served as a Director and Assistant Secretary of both MD and MOC. Prior to that time she was employed by Rauscher, Pierce, Refsnes, Inc. Ms. Greene is the daughter of Curtis W. Mewbourne and is the sister of Dorothy M. Cuenod and Ruth M. Buckley. She is also the sister-in-law of J. Roe Buckley.

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ITEM 11. Executive Compensation

The Registrant does not have any officers or directors. Management of the Registrant is vested in the managing general partner. None of the officers or directors of MD or MOC will receive remuneration directly from the Registrant, but will continue to be compensated by their present employers. The Registrant will reimburse MD and MOC and affiliates thereof for certain costs of overhead falling within the definition of Administrative Costs, including without limitation, salaries of the officers and employees of MD and MOC; provided that no portion of the salaries of the directors or of the executive officer of MOC or MD may be reimbursed as Administrative Costs.

ITEM 12. Security Ownership of Certain Beneficial Owners and Management

(a) Beneficial owners of more than five percent

(b) Security ownership of management

The Registrant does not have any officers or directors. The managing general partner of the Registrant, MD, has the exclusive right and full authority to manage, control and administer the Registrant’s business. Under the Registrant’s Partnership Agreement, limited and general partners holding a majority of the outstanding limited and general partnership interests have the right to take certain actions, including the removal of the managing general partner. The Registrant is not aware of any current arrangement or activity that may lead to such removal.

ITEM 13. Certain Relationships and Related Transactions

Transactions with MD and its affiliates

Pursuant to the Registrant’s Partnership Agreement, the Registrant had the following related party transactions with MD and its affiliates during the years ended December 31, 2004, 2003 and 2002:

The Registrant participates in oil and gas activities through a drilling program created by the Drilling Program Agreement (the “Program”). Pursuant to the Program, MD pays approximately 30% of the Program’s capital expenditures and approximately 40% of its operating and general and administrative expenses. The Registrant pays the remainder of the costs and expenses of the Program. In return, MD is allocated approximately 40% of the Program’s revenues.

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PART IV

ITEM 14. Principal Accountant Fees and Services

The Partnership has retained PricewaterhouseCoopers LLP as their independent registered public accounting firm.

ITEM 15. Exhibits, Financial Statements, Financial Statement Schedules and Reports on Form 8-K

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereto duly authorized.

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.

Supplemental Information to be Furnished With Reports Filed Pursuant to Section 15(d) of the Act by Registrants Which Have Not Registered Securities Pursuant to Section 12 of the Act

No annual report or proxy material has been sent to the Registrant’s security holders.

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MEWBOURNE ENERGY PARTNERS 01-A, L.P.

FINANCIAL STATEMENTS

WITH REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

For the years ended December 31, 2004, 2003 and 2002

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Report of Independent Registered Public Accounting Firm

To the Partners of Mewbourne Energy Partners 01-A, L.P. and to the Board of Directors of Mewbourne Development Corporation:

In our opinion, the accompanying balance sheets and the related statements of operations, of changes in partners’ capital and of cash flows present fairly, in all material respects, the financial position of Mewbourne Energy Partners 01-A, L.P. at December 31, 2004 and 2003 and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2004 in conformity with accounting principles generally accepted in the United States of America. These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits of these statements in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

As discussed in Note 1 to the consolidated financial statements, the Company adopted the provisions of Statement of Financial Accounting Standard No. 143, “Accounting for Asset Retirement Obligations,” as of January 1, 2003 and changed the manner in which it accounts for asset retirement costs.

/s/ PricewaterhouseCoopers LLP

Dallas, Texas

March 29, 2005

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Mewbourne Energy Partners 01-A, L.P.

BALANCE SHEETS

December 31, 2004 and 2003

The accompanying notes are an integral part of the financial statements.

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Mewbourne Energy Partners 01-A, L.P.

STATEMENTS OF OPERATIONS

For the years ended December 31, 2004, 2003 and 2002

The accompanying notes are an integral part of the financial statements.

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Mewbourne Energy Partners 01-A, L.P.

STATEMENT OF CHANGES IN PARTNERS’ CAPITAL

For the years ended December 31, 2004, 2003 and 2002

The accompanying notes are an integral part of the financial statements.

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Mewbourne Energy Partners 01-A, L.P.

STATEMENTS OF CASH FLOWS

For the years ended December 31, 2004, 2003, and 2002

The accompanying notes are an integral part of the financial statements.

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Mewbourne Energy Partners 01-A, L.P.

NOTES TO FINANCIAL STATEMENTS

Accounting for Oil and Gas Producing Activities

Mewbourne Energy Partners 01-A, L.P., (the “Partnership”), a Delaware limited partnership engaged primarily in oil and gas development and production in Texas, Oklahoma, and New Mexico, was organized on February 23, 2001. The offering of limited and general partnership interests began June 12, 2001 as a part of an offering registered under the name Mewbourne Energy Partners 01-02 Drilling Programs, (the “Program”), and concluded August 28, 2001, with total investor contributions of $15,000,000 being sold to 569 subscribers of which $13,513,000 were sold to 528 subscribers as general partner interests and $1,487,000 were sold to 41 subscribers as limited partner interests. During the quarter ended June 30, 2003, all general partner interests were converted to limited partner interests.

The Program’s sole business is the development and production of oil and gas with a concentration on gas. Substantially all of the Program’s gas reserves are being sold regionally in the spot market. Due to the highly competitive nature of the spot market, prices are subject to seasonal and regional pricing fluctuations. In addition, such spot market sales are generally short-term in nature and are dependent upon obtaining transportation services provided by pipelines. The prices received for the Program’s oil and gas are subject to influences such as global consumption and supply trends.

The Partnership follows the full-cost method of accounting for its oil and gas activities. Under the full-cost method, all productive and non-productive costs incurred in the acquisition, exploration and development of oil and gas properties are capitalized. Depreciation, depletion and amortization of oil and gas properties subject to amortization is computed on the units-of-production method based on the proved reserves underlying the oil and gas properties. At December 31, 2004, 2003 and 2002 substantially all capitalized costs were subject to amortization. Proceeds from the sale or other disposition of properties are credited to the full cost pool. Gains and losses are not recognized unless such adjustments would significantly alter the relationship between capitalized costs and the proved oil and gas reserves. Capitalized costs are subject to a quarterly ceiling test that limits such costs to the aggregate of the present value of future net cash flows of proved reserves and the lower of cost or fair value of unproved properties. There were no cost ceiling write-downs for the years ended December 31, 2004 and 2003, while at December 31, 2002 there was a cost ceiling write-down of $2,152,691.

Significant estimates inherent in the Registrant’s financial statements include the estimate of oil and gas reserves and future abandonment costs as reported in the footnotes to the financial statements. Changes in oil and gas prices and the changes in production estimates could have a significant effect on reserve estimates. The reserve estimates directly impact the computation of depreciation, depletion, and amortization, asset retirement obligation, and the ceiling test for the Registrant’s oil and gas properties.

The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

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Cash

The Partnership maintains all its cash in one financial institution.

Asset Retirement Obligations

On January 1, 2003, the Partnership adopted Statement of Financial Accounting Standard No. 143 (“FAS 143”), “Accounting for Asset Retirement Obligations.” This statement changes the financial accounting and reporting obligations associated with the retirement and disposal of long-lived assets, including the Partnership’s oil and gas properties, and the associated asset retirement costs.

A liability for the estimated fair value of the future plugging and abandonment costs is recorded with a corresponding increase in the full cost pool at the time a new well is drilled. Depreciation expense associated with estimated plugging and abandonment costs is recognized in accordance with the full cost methodology.

The Partnership estimates a liability for plugging and abandonment costs based on historical experience and estimated well life. The liability is discounted using the credit-adjusted risk-free rate. Revisions to the liability could occur due to changes in well plugging and abandonment costs or well useful lives, or if federal or state regulators enact new well restoration requirements. The Partnership recognizes accretion expense in connection with the discounted liability over the remaining life of the well.

Upon adoption of FAS 143 on January 1, 2003, the Partnership recorded a discounted liability of $297,742, increased the net full cost pool by $346,332 and recognized a one-time cumulative effect adjustment of $(48,590).

The following pro forma data summarizes our net loss as if the provisions of SFAS 143 had been applied as of January 1, 2001:

A reconciliation of the Partnership’s liability for well plugging and abandonment costs for the years ended December 31, 2004 and 2003, is as follows:

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Oil and Gas Sales

The Program’s oil and condensate production is sold, title passed, and revenue recognized at or near the Program’s wells under short-term purchase contracts at prevailing prices in accordance with arrangements which are customary in the oil industry. Sales of gas applicable to the Program’s interest are recorded as revenue when the gas is metered and title transferred pursuant to the gas sales contracts covering the Program’s interest in gas reserves. The Partnership uses the sales method to recognize oil and gas revenue whereby revenue is recognized for the amount of production taken regardless of the amount for which the Partnership is entitled based on its working interest ownership. As of December 31, 2004, 2003 and 2002, no material gas imbalances between the Partnership and other working interest owners existed.

Income Taxes

The Partnership is treated as a partnership for income tax purposes, and as a result, income of the Partnership is reported on the tax returns of the partners and no recognition is given to income taxes in the financial statements.

The Partnership was organized on February 23, 2001. Mewbourne Development Corporation (MD) is managing general partner and Mewbourne Oil Company (MOC) is operator of oil and gas properties owned by the Partnership. Mewbourne Holdings, Inc. is the parent of both MD and MOC. Substantially all transactions are with MD and MOC.

In the ordinary course of business, MOC will incur certain costs that will be passed on to well owners of the well on which the costs were incurred. The partnership will receive their portion of these costs based upon their ownership in each well incurring the costs. These costs are referred to as Operator charges and are standard and customary in the oil and gas industry. Operator charges include recovery of gas marketing costs, fixed rate overhead, supervision, pumping, and equipment furnished by the Operator. Reimbursement to MOC for operator charges totaled $191,754, $227,868 and $814,743 for the years ended December 31, 2004, 2003 and 2002, respectively. Operator charges are billed in accordance with the program and partnership agreements.

In general, during any particular calendar year, the total amount of administrative expenses allocated to the Partnership shall not exceed the greater of (a) 3.5% of the Partnership’s gross revenue from the sale of oil and natural gas production during each year (calculated without any deduction for operating costs or other costs and expenses) or (b) the sum of $50,000 plus .25% of the capital contributions of limited and general partners. Under this arrangement, $110,141, $165,292 and $88,433 were allocated to the Partnership during the years ended December 31, 2004, 2003 and 2002, respectively.

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The Partnership participates in oil and gas activities through a Drilling Program Agreement, the Program. The Partnership and MD are parties to the Program agreement. The costs and revenues of the Program are allocated to MD and the Partnership as follows:

The Partnership’s financial statements reflect its respective proportionate interest in the Program.

The following is a reconciliation of net income (loss) per statements of operations with net income (loss) per federal income tax return for the years ended December 31, 2004, 2003 and 2002:

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The Partnership’s financial reporting bases of its net assets exceeded the tax bases of its net assets by $6,966,884, $7,322,224 and $6,681,493 at December 31, 2004, 2003 and 2002, respectively.

On September 28, 2004 the Security and Exchange Commission issued Staff Accounting Bulletin No. 106 (SAB No. 106). The interpretations in SAB No. 106 express the staff’s views regarding the application of FASB Statement No. 143, “Accounting for Asset Retirement Obligations”, by oil and gas producing companies following the full cost accounting method.

Under Statement 143, the Partnership must recognize a liability for an asset retirement obligation at fair value in the period in which the obligation is incurred, if a reasonable estimate of fair value can be made. The Partnership also must initially capitalize the associated asset retirement costs by increasing its full cost pool by the same amount as the liability. Under the full cost method of accounting, the Partnership calculates quarterly a limitation on capitalized costs, i.e., the full cost ceiling of our oil and natural gas properties and any asset retirement costs capitalized pursuant to Statement 143 are subject to the full cost ceiling limitation. SAB No. 106 provides that after adoption of Statement 143, the future cash outflows associated with settling asset retirement obligations that have been accrued on the balance sheet should be excluded from the computation of the present value of estimated future net revenues for purposes of the full cost ceiling calculation. Currently, the future cash outflows associated with settling asset retirement obligations are included in the computation of the present value of estimated future reserves for purposes of the full cost ceiling calculation. The amount of the full cost pool subject to the ceiling test is decreased by the amount of the asset retirement obligation liability. The effect of this interpretation will increase the ceiling as it relates to the Partnership’s full cost pool and will increase the amount of the full cost pool that is subject to the ceiling. The Partnership does not expect SAB 106 to have a material impact on the calculation of its full cost ceiling test.

Subsequent to the adoption of Statement 143, the estimated dismantlement and abandonment costs for the Partnership’s oil and natural gas properties that have been capitalized have been included in the costs used when calculating the depreciation, depletion and amortization (DD&A) rate used to amortize the properties. Future development activities on proved reserves may result in additional asset retirement obligations when such activities are performed and the associated asset retirement costs will be capitalized at that time. Under the interpretations in SAB No. 106 to the extent that estimated dismantlement and abandonment costs, net of estimated salvage values, have not been capitalized for future development activity, the Partnership will be required to estimate the amount of dismantlement and abandonment costs that will be incurred and include those amounts in the costs to be amortized. The Partnership has not yet determined the full impact this will have on DD&A but it is not expected to be material.

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The tables presented below provide supplemental information about oil and natural gas exploration and production activities as defined by SFAS No. 69, “Disclosures about Oil and Gas Producing Activities”.

Costs Incurred and Capitalized Costs:

Costs incurred in oil and natural gas acquisition, exploration and development activities for the years ended December 31, 2004, 2003 and 2002:

Capitalized costs related to oil and natural gas acquisition, exploration and development activities for the years ended December 31, 2004 and 2003 are as follows:

Depreciation, depletion and amortization per one thousand cubic feet of gas equivalents was $1.29, $1.22 and $1.22 for the years ended December 31, 2004, 2003 and 2002, respectively.

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Estimated Net Quantities of Proved Oil and Gas Reserves (Unaudited):

Reserve estimates as well as certain information regarding future production and discounted cash flows were determined by the Partnership’s independent petroleum consultants and MOC’s petroleum reservoir engineers. The Partnership considers reserve estimates to be reasonable, however, due to inherent uncertainties and the limited nature of reservoir data, estimates of oil and gas reserves are imprecise and subject to change over time as additional information becomes available.

There have been no favorable or adverse events that have caused a significant change in estimated proved reserves since December 31, 2004. The Partnership has no long-term supply agreements or contracts with governments or authorities in which it acts as producer nor does it have any interest in oil and gas operations accounted for by the equity method. All reserves are located onshore within the United States.

Proved Reserves:

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Standardized Measure of Discounted Future Net Cash Flows (Unaudited):

For the years ended December 31, 2004, 2003 and 2002

The Standardized measure of discounted future net cash flows from estimated production of proved oil and gas reserves is presented in accordance with the provisions of Statement of Financial Accounting Standards No. 69, “Disclosures about Oil and Gas Producing Activities” (SFAS No. 69). In computing this data, assumptions other than those mandated by SFAS No. 69 could produce substantially different results. The Partnership cautions against viewing this information as a forecast of future economic conditions, revenues, or fair value.

The standardized measure has been prepared assuming year-end selling prices, year-end development and production costs and a 10 percent annual discount rate. No future income tax expense has been provided for the Partnership since it incurs no income tax liability. (See Significant Accounting Policies – Income Taxes in Note 1 to the Financial Statements.) The year-end prices were $41.69 per barrel of oil and $5.48 for MCF of gas as of December 31, 2004, $31.14 per barrel of oil and $5.68 for MCF of gas as of December 31, 2003, and $28.03 per barrel of oil and $4.03 for MCF of gas as of December 31, 2002.

Summary of changes in the Standardized Measure