FORM 11-K (X) ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2000 OR ( ) TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to ----------- ------------- COMMISSION FILE NUMBER 1-14756 AMEREN CORPORATION LONG-TERM SAVINGS PLAN - IUOE NO. 148 Issuer: Ameren Corporation 1901 Chouteau Avenue St. Louis, Missouri 63103 (Principal Executive Office) AMEREN CORPORATION EMPLOYEE LONG-TERM SAVINGS PLAN - IUOE NO. 148 Financial Statements December 31, 2000 and 1999 AMEREN CORPORATION Employee Long-Term Savings Plan - IUOE NO. 148 Index December 31, 2000 and 1999 ------------------------------------------------------------------------------- Page Report of Independent Accountants 1 Statement of Net Assets Available for Benefits at December 31, 2000 and 1999 2 Statement of Changes in Net Assets Available for Benefits for the years ended December 31, 2000 and 1999 3 Notes to Financial Statements 4-13 Note: Schedules required by 29CFR 2520.103-10 of the Department of Labor Rules and Regulations for Reporting and Disclosure under ERISA have been omitted because they are not applicable. Report of Independent Accountants To the Board of Directors of Ameren Corporation and the Participants of the Ameren Corporation Employee Long-Term Savings Plan - IUOE No. 148 In our opinion, the accompanying statement of net assets available for benefits and the related statement of changes in net assets available for benefits present fairly, in all material respects, the net assets available for benefits of the Ameren Corporation Employee Long-Term Savings Plan - IUOE No. 148 (the Plan) at December 31, 2000 and 1999, and the changes in net assets available for benefits for the years then ended in conformity with accounting principles generally accepted in the United States of America. These financial statements are the responsibility of the Plan'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 auditing standards generally accepted in the United States of America, which 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. /s/ PriceWaterhouseCoopers LLP June 28, 2001 AMEREN CORPORATION Employee Long-Term Savings Plan - IUOE NO. 148 Statement of Net Assets Available for Benefits December 31, 2000 and 1999 Page 2 -------------------------------------------------------------------------------- 2000 1999 ------------------ ---------------- Assets Investments at fair value $ 27,924,640 $ 26,039,797 Cash 10,613 - Interest and dividends receivable 17,836 14,483 Due from broker for investment sales 252,074 - Contributions receivable: Participant 81,434 73,628 Employer 3,812 - ------------------ ---------------- 85,246 73,628 ------------------ ---------------- Net assets available for benefits $ 28,290,409 $ 26,127,908 ================== ================ The accompanying notes are an integral part of these financial statements. AMEREN CORPORATION Employee Long-Term Savings Plan - IUOE NO. 148 Statement of Net Assets Available for Benefits For the Years Ended December 31, 2000 and 1999 Page 3 -------------------------------------------------------------------------------- 2000 1999 -------- -------- Additions to net assets attributed to: Participant contributions $ 1,530,325 $ 1,485,450 Employer contributions 36,866 Interest and dividends 1,112,311 1,025,202 Net appreciation (depreciation) in fair value of investments 1,482,281 (383,667) ------------- ------------ Total additions 4,161,783 2,126,985 Deductions from net assets attributed to: Distributions 1,997,281 1,489,527 Administrative expenses 2,001 2,191 ------------- ------------ Total deductions 1,999,282 1,491,718 ------------- ------------ Increase in net assets available for benefits 2,162,501 635,267 Net assets available for benefits, Beginning of year 26,127,908 25,492,641 ------------- ------------- End of year $ 28,290,409 $ 26,127,908 ================== ============== The accompanying notes are an integral part of these financial statements. AMEREN CORPORATION Employee Long-Term Savings Plan - IUOE NO. 148 Notes to Financial Statements December 31, 2000 and 1999 Page 4 -------------------------------------------------------------------------------- 1. Description of the plan General The following is a brief summary of the various provisions of the Ameren Corporation (the Company) Employee Long-Term Savings Plan - IUOE No. 148 (the Plan). The Plan provides for the investment in certain funds under the Plan for each participating employee (the Participant) of Central Illinois Public Service Company, a wholly owned subsidiary of the Company, and AmerenEnergy Generating Company, an indirectly wholly owned subsidiary of the Company (Participating Subsidiaries). Participants should refer to the Plan document for more complete information. The Plan initially was established as the Central Illinois Public Service Company Employee Long-Term Savings Plan - IUOE No. 148. Effective January 1, 2000, the plan was renamed the Ameren Corporation Employee Long-Term Savings Plan - IUOE No. 148. The Company adopted the Plan on January 1, 1990, to provide a systematic means by which certain eligible employees of the Company may adopt a regular savings program and secure federal income tax benefits resulting from participation in the Plan. The Plan is a defined contribution plan subject to the Employee Retirement Income Security Act of 1974 (ERISA). A committee (the Committee) consisting of at least three persons appointed by the Company administers the Plan. The Committee has the power to adopt rules and regulations as deemed necessary or advisable to carry out the Plan in accordance with its terms. No member of the Committee who is an employee of the Company may receive any remuneration for services performed in this capacity as a member of the Committee. Merrill Lynch Trust Company of America (the Trustee) serves as trustee under terms of the Master Trust. Participation Each employee of the Participating Subsidiaries receiving regular salary or wages who is part of the IUOE Local No. 148 collective bargaining unit and who has both completed one year of service (defined as a consecutive twelve-month period beginning with his/her employment commencement date or anniversary thereof during which he/she has completed at least 1,000 hours of service) and has attained the age of 21 is eligible to become an active Participant. Contributions The Plan permits a participant to make contributions to the Plan through payroll reductions from 1% up to 15% of the Participant's compensation (as defined in the Plan document). AMEREN CORPORATION Employee Long-Term Savings Plan - IUOE NO. 148 Notes to Financial Statements December 31, 2000 and 1999 Page 5 -------------------------------------------------------------------------------- The Tax Reform Act of 1986 limited the maximum annual amount that may be contributed by a Participant to $10,500 in 2000 and $10,000 in 1999. The Company transfers to the Master Trust the amount designated by the Participant where it is placed in a Participant's account no less frequently than semi-monthly. Effective July 1, 2000, the Company makes a matching contribution equal to 10% of the amount of compensation reduction contributions, not to exceed 5% of the participants' compensation while an active participant for such payroll period. Contributions are invested in accordance with the Participant's directions in one or more of the Funds. Employees may make "qualifying rollover contributions" of amounts received as a distribution from a prior employer's plan. Vesting The amounts in Participants' accounts, including Company contributions, are fully vested at all times. Investment options Participants may direct their contributions and Company contributions made on their behalf to any of the following investment options. Ameren Common Stock Fund - This fund invests in shares of Ameren Corporation common stock which the trustee purchases in the open market from time to time. Bond Index Fund - Funds are invested in the Barclays Global Investors Government/Corporate Bond Index Fund which is a stratified sample of bonds comprising the Lehman Brothers Government/Corporate Bond Index (the Bond Index). The Bond Index is comprised primarily of U.S. Government, U.S. Agency and corporate bonds. Standard & Poor's (S&P) 500 Equity Index Trust - Funds are invested in the Merrill Lynch Equity Index Trust, a collective trust fund maintained by Merrill Lynch Trust Company. The investment objectives of the Merrill Lynch Equity Index Trust are to approximate the total return of the S&P 500 Composite Stock Index (the Equity Index). The investment strategy has two components. Ordinarily, over 90% of the assets are held as a traditional "full replication" Equity Index portfolio comprised of all, or nearly all, 500 stocks in weightings closely aligned with those of the Equity Index. The balance of the assets are held in a liquidity pool of cash equivalents (hedged by ownership of S&P 500 Index Futures) that provide a return very close to the Equity Index, while allowing low-cost, efficient accommodation of cash flows in and out of the Merrill Lynch Equity Index Trust. AMEREN CORPORATION Employee Long-Term Savings Plan - IUOE NO. 148 Notes to Financial Statements December 31, 2000 and 1999 Page 6 -------------------------------------------------------------------------------- Money Market Fund - Funds are invested in the Barclays Global Investors Money Market Fund for Employee Benefit Trusts, which provides for investment and reinvestment in a variety of money market instruments, including but not limited to U.S. government and agency securities, bank obligations such as certificates of deposit, banker's acceptances and fixed-time deposits, short-term commercial debt instruments such as commercial paper, unsecured loan participation or variable rate demand notes and repurchase agreements. Growth Equity Fund - Funds are invested in a separately managed portfolio consisting primarily of equity securities, or securities convertible into common stocks. A portion of the portfolio may be invested in cash equivalents. The portfolio is managed by Merrill Lynch Asset Management. Merrill Lynch Retirement Preservation Trust - Funds are invested primarily in U.S. government and agency securities, guaranteed investment contracts issued generally by insurance carriers and banks, and high-quality money market instruments. This Fund is a collective trust fund maintained by Merrill Lynch Trust Company. AIM Value Fund - Funds are invested primarily in equity securities that are judged by the manager to be undervalued. The AIM Value Fund invests primarily in common stocks, convertible bonds and convertible preferred stocks, but also may invest in preferred stocks and other debt securities. Merrill Lynch Global Allocation Fund - Class A Shares - This fund varies the mix of investments in United States and foreign equity, debt and money market securities based upon the manager's evaluation of changing market and economic trends. Merrill Lynch Capital Fund - Class A Shares - This fund has a fully managed investment policy utilizing equity, debt and convertible securities. Consistent with policy, the Capital Fund's portfolio may, at any given time, be invested substantially in equity securities (stocks), corporate bonds, or money market securities. It is the expectation of the investment manager that over longer periods, a major portion of the Capital Fund's portfolio will consist of equity securities of larger-market capitalization companies. Plan Withdrawals/Loans No withdrawals from a Participant's account are permitted while the Participant continues to be employed by the Company except that, upon compliance with the provisions of the Plan, one withdrawal may be made each year in limited cases of financial hardship. In addition, Participants may make withdrawals of their rollover contributions and earnings thereon. AMEREN CORPORATION Employee Long-Term Savings Plan - IUOE NO. 148 Notes to Financial Statements December 31, 2000 and 1999 Page 7 -------------------------------------------------------------------------------- Upon application of a Participant and payment of a loan application fee, the Committee may, in compliance with the Plan, direct the Trustee to make a loan to the Participant from the Participant's account upon such terms as the Committee shall specify. Participants' loans are maintained in the Participant Loan Fund. Distributions Upon termination of employment for any reason, a Participant will be entitled to receive the balance in the Participant's account less the unpaid amount of any outstanding loan (including accrued interest). Generally, distributions will be made in a lump sum; however, in certain circumstances a Participant may also elect to receive his/her distribution in installments. Certain distributions may be deferred until a participant reaches age 70 1/2, dies, or requests an earlier distribution (whichever occurs first). Amounts that have been requested for withdrawal by Participants, but have not yet been distributed by the Plan, are included in net assets available for benefits. There were no amounts requested for withdrawal by Participants, but not yet distributed by the Plan, as of December 31, 2000 or 1999. Plan termination The Company has a right to terminate the Plan at any time subject to the provisions of ERISA. Upon termination, the Trustee will distribute assets remaining in the Trust Fund with the exception that no distributions shall be made until a participant attains age 59 1/2, except in certain specified situations. 2. Summary of significant accounting policies Basis of accounting The financial statements of the Plan are prepared on the accrual basis of accounting. Use of estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America 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 changes in net assets during the reporting period. Actual results could differ from those estimates. AMEREN CORPORATION Employee Long-Term Savings Plan - IUOE NO. 148 Notes to Financial Statements December 31, 2000 and 1999 Page 8 -------------------------------------------------------------------------------- Investments All investments are presented at fair value as of December 31, 2000 and 1999. The fair value of the Ameren Common Stock Fund was determined using year-end published market prices. Investments in equity securities and bonds are valued at net asset market value including accrued income on the last business day of each year. Investments in the Money Market Fund and Merrill Lynch Retirement Preservation Trust are valued at cost plus accrued income, which approximates market. Participant loans are valued at cost, which approximates fair market value. Investment securities are exposed to various risks, such as interest rate, market, and credit. Due to the level of risk associated with certain investment securities and the level of uncertainty related to changes in the value of investment securities, it is at least reasonably possible that changes in risks in the near term could materially affect the amounts reported in the Statement of Net Assets Available for Benefits. Income Interest income is recorded on the accrual basis. Dividend income is recorded on the ex-dividend date. Gains and losses on security transactions are recorded on the trade date. Net unrealized appreciation or depreciation for the year is reflected in Net appreciation (depreciation) of investments on the Statement of Changes in Net Assets Available for Benefits. Expenses In general, expenses to administer the Plan, including fees and expenses of the Trustee, are paid by the Company, except as provided for in the Plan. All transaction fees of an investment fund are paid from the assets of that investment fund. Benefit payments Benefit payments are recorded when paid. Reclassifications Certain reclassifications have been made to prior years' financial statements to conform with 2000 reporting. AMEREN CORPORATION Employee Long-Term Savings Plan - IUOE NO. 148 Notes to Financial Statements December 31, 2000 and 1999 Page 9 -------------------------------------------------------------------------------- 3. Investments The following table presents investments. Investments that represent five percent or more of the Plan's net assets available for benefits at year end are identified separately. December 31, 2000 1999 ------ ------ Investments at Fair Value as Determined by Quoted Market Price Ameren Common Stock $9,212,626 $9,525,541 Common/Collective Trusts: S&P 500 Equity Index Trust 5,932,206 6,020,398 Bond Index Fund 566,731 567,302 Money Market Fund 3,465,971 2,022,774 Growth Equity Fund 3,991,051 4,946,184 Merrill Lynch Retirement Preservation Trust 2,028,752 892,063 -------------- -------------- Total Common/Collective Trusts 15,984,711 14,448,721 Mutual Funds: AIM Value Fund 1,155,829 643,935 Merrill Lynch Global Allocation Fund - Class A 133,956 77,356 Merrill Lynch Capital Fund - Class A 328,173 229,777 -------------- -------------- Total Mutual Funds 1,617,958 951,068 Investments at Estimated Fair Value Loans to Participants 1,109,345 1,114,467 ------------- ------------- Total Investments $27,924,640 $26,039,797 =========== =========== 4. Transactions with parties-in-interest At December 31, 2000, the Plan held Ameren Corporation common stock with a cost and market value of $6,486,748 and $9,212,626, respectively. During 2000, the Plan purchased shares at a cost of $1,866,191 and sold shares valued at $5,351,525 resulting in a net realized gain of $636,300. The Plan also distributed shares valued at $621,872 to persons withdrawing from the Plan. AMEREN CORPORATION Employee Long-Term Savings Plan - IUOE NO. 148 Notes to Financial Statements December 31, 2000 and 1999 Page 10 -------------------------------------------------------------------------------- At December 31, 1999, the Plan held Ameren Corporation common stock with a cost and market value of $9,675,082 and $9,525,541, respectively. During 1999, the Plan purchased shares at a cost of $3,933,102 and sold shares valued at $1,111,388, resulting in a net realized gain of $105,128. The Plan also distributed shares valued at $350,600 to persons withdrawing from the Plan. The Plan held $2,028,752 and $892,063 in the Merrill Lynch Retirement Preservation Trust at December 31, 2000 and 1999, respectively. This Fund is a collective trust fund with book value approximating market. At December 31, 2000, the Plan held shares in the S&P 500 Equity Index Trust with a cost and market value of $3,856,086 and $5,932,206, respectively. During 2000, the Plan purchased shares at a cost of $1,373,834 and sold shares valued at $905,149 resulting in a net realized gain of $357,150. At December 31, 1999, the Plan held shares in the S&P 500 Equity Index Trust with a cost and market value of $3,027,393 and $6,020,398, respectively. During 1999, the Plan purchased shares at a cost of $2,069,604 and sold shares valued at $1,637,348, resulting in a net realized gain of $214,205. At December 31, 2000, the Plan held shares in the Merrill Lynch Global Allocation Fund - Class A with a cost and market value of $143,922 and $133,956, respectively. During 2000, the Plan purchased shares at a cost of $93,425 and sold shares valued at $28,139, resulting in a net realized gain of $161. At December 31, 1999, the Plan held shares in the Merrill Lynch Global Allocation Fund - Class A with a cost and market value of $78,475 and $77,356, respectively. During 1999, the Plan purchased shares at a cost of $29,760 and sold shares valued at $38,020, resulting in a net realized loss of $1,192. At December 31, 2000, the Plan held shares in the Merrill Lynch Capital Fund - Class A with a cost and market value of $345,769 and $328,173, respectively. During 2000, the Plan purchased shares at a cost of $172,235 and sold shares valued at $59,314, resulting in a net realized loss of $4,875. At December 31, 1999, the Plan held shares in the Merrill Lynch Capital Fund - Class A with a cost and market value of $237,723 and $229,777, respectively. During 1999, the Plan purchased shares at a cost of $102,600 and sold shares valued at $34,776, resulting in a net realized gain of $66. AMEREN CORPORATION Employee Long-Term Savings Plan - IUOE NO. 148 Notes to Financial Statements December 31, 2000 and 1999 Page 11 -------------------------------------------------------------------------------- These transactions are allowable party-in-interest transactions under Section 408(b)(8) of the ERISA regulations. 5. Federal income tax status The Plan is intended to qualify as a deferred compensation plan under sections 401 (a) and 401 (k) of the Internal Revenue Code of 1986. Qualification of the Plan means that a Participant will not be subject to federal income taxes on amounts contributed to the Participant's account, or the earnings or appreciation thereon, until such amounts either are withdrawn by the Participant or are distributed to the Participant or a beneficiary in the event of the Participant's death. Payroll reduction contributions to a Participant's account reduce the gross income of the Participant for federal income tax purposes to the extent of the contributions. The Company received a favorable determination letter from the Internal Revenue Service dated August 20, 1996, concerning the qualification of the Plan under federal income tax regulations. In addition, the Company also received a favorable determination letter from the Internal Revenue Service dated December 8, 1986, concerning qualification of the Master Long-Term Savings Trust under federal income tax regulations. Management believes that the Plan is currently designed and is being operated in compliance with requirements of the Internal Revenue Code and that the Plan is tax exempt as of the financial statement date. Discussions of the federal income tax consequences of the Plans, including consequences on distributions of Participant's account, are contained in the Company's Employee Long-Term Savings Plan Summary Plan Description (dated July, 2000). 6. Participation in Master Trust The Central Illinois Public Service Company Master Long-Term Savings Trust (the Master Trust) was established April 1, 1985, to serve as the funding medium for the Plan and for the other separate Employee Long-Term Savings Plan which is for the members of the IBEW No. 702 collective bargaining unit employed by the Participating Subsidiaries. This separate plan is not included in this report and is shown separately in its own report. At December 31, 2000 and 1999, the Plan's interest in the net assets of the master trust was approximately 44%. The Master Trusts' Statement of Net Assets at December 31, 2000 and 1999 and Statement of Changes in Net Assets for the Year Ended December 31, 2000 and 1999 are detailed on the following pages. AMEREN CORPORATION Employee Long-Term Savings Plan - IUOE NO. 148 Notes to Financial Statements December 31, 2000 and 1999 Page 12 -------------------------------------------------------------------------------- Statement of Net Assets, Master Trust 2000 1999 ------- ------ Investments, at fair value: Ameren Common Stock Fund $ 19,292,555 $ 17,779,909 Bond Index Fund 1,753,203 1,572,443 Money Market Fund 5,151,053 2,986,046 Growth Equity Fund 11,017,606 13,653,646 Standard & Poor's (S&P) 500 Equity Index Trust 15,027,531 15,277,471 Merrill Lynch Retirement Preservation Trust 2,549,312 1,194,818 AIM Value Fund 4,585,338 3,492,094 Merrill Lynch Global Allocation Fund - Class A 847,694 485,030 Merrill Lynch Capital Fund - Class A 850,298 722,074 Participant Loan Fund 2,705,672 2,542,130 ------------ ------------ Total investments 63,780,262 59,705,661 Cash 36,663 - Receivables: Due from broker for investment sales 257,905 - Contributions receivable 260,927 229,799 Interest and dividends receivable 37,830 29,891 -------------- -------------- Net assets available for benefits $ 64,373,587 $ 59,965,351 =================== ================ AMEREN CORPORATION Employee Long-Term Savings Plan - IUOE NO. 148 Notes to Financial Statements For the Years Ended December 31, 2000 and 1999 Page 13 -------------------------------------------------------------------------------- Statement of Changes in Net Assets, Master Trust 2000 1999 ------- ------ Additions: Participant contributions $ 5,107,076 $ 4,808,612 Employer contributions 334,939 230,191 Interest and dividends 2,395,414 2,082,361 Net appreciation in fair value of investments 827,966 1,177,732 ------------ ------------- Total additions 8,665,395 8,298,896 ------------ ------------- Deductions: Distributions 4,250,519 2,692,076 Administrative expenses 6,640 5,992 ----------- ------------- Total deductions 4,257,159 2,698,068 ----------- ------------- Increase in net assets available for benefits 4,408,236 5,600,828 Net assets available for benefits Beginning of year 59,965,351 54,364,523 ------------- ------------- End of year $ 64,373,587 $ 59,965,351 ================== ================= SIGNATURE The Plan. Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this annual report to be signed on its behalf by the undersigned hereunto duly authorized. AMEREN CORPORATION LONG-TERM SAVINGS PLAN - IUOE NO. 148 AMEREN SERVICES COMPANY (Administrator) By /s/ Jean M. Hannis -------------------------- Jean M. Hannis Vice President June 29, 2001 EXHIBIT INDEX Exhibits Filed Herewith ----------------------- Exhibit No. Description ------------- --------------------------- 23 Consent of Independent Accountants EXHIBIT 23 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 333-43743) of Ameren Corporation of our report dated June 28, 2001 on the financial statements of the Ameren Corporation Long-Term Savings Plan, IUOE No. 148 for the year ended December 31, 2000, which is included in this Form 11-K. /s/ PricewaterhouseCoopers LLP St. Louis, Missouri June 28, 2001