UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 1, 2004 Exact Name of Registrant as specified in its charter; Commission State of Incorporation; IRS Employer File Number Address and Telephone Number Identification No. ----------- ---------------------------- -------------- 1-14756 Ameren Corporation 43-1723446 (Missouri Corporation) 1901 Chouteau Avenue St. Louis, Missouri 63103 (314) 621-3222 1-2967 Union Electric Company 43-0559760 (Missouri Corporation) 1901 Chouteau Avenue St. Louis, Missouri 63103 (314) 621-3222 1-3672 Central Illinois Public Service Company 37-0211380 (Illinois Corporation) 607 East Adams Street Springfield, Illinois 62739 (217) 523-3600 333-56594 Ameren Energy Generating Company 37-1395586 (Illinois Corporation) 1901 Chouteau Avenue St. Louis, Missouri 63103 (314) 621-3222 2-95569 CILCORP Inc. 37-1169387 (Illinois Corporation) 300 Liberty Street Peoria, Illinois 61602 (309) 677-5230 1-2732 Central Illinois Light Company 37-0211050 (Illinois Corporation) 300 Liberty Street Peoria, Illinois 61602 (309) 677-5230 Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: [ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) [ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) [ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) [ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) 2 SECTION 5 - CORPORATE GOVERNANCE AND MANAGEMENT ITEM 5.02 Departure of Directors or Principal Officers; Election of Directors; Appointment of Principal Officers. On September 1, 2004, Ameren Corporation (Ameren) announced that Garry L. Randolph will relinquish his directorship on Union Electric Company's board of directors in conjunction with his retirement from Union Electric Company effective December 31, 2004 (refer to Item 8.01 below). SECTION 8 - OTHER EVENTS ITEM 8.01 Other Events. On September 1, 2004, Ameren announced that Garry L. Randolph, Senior Vice President and Chief Nuclear Officer of Union Electric Company and Senior Vice President of Central Illinois Public Service Company, Ameren Energy Generating Company, CILCORP Inc. and Central Illinois Light Company, will retire effective December 31, 2004 and that during 2005, Mr. Randolph will provide consulting services to the Ameren companies. It was also announced that Charles D. Naslund, Vice President of Union Electric Company's Power Operations was elected Vice President-Nuclear Operations effective September 1, 2004. Ronald S. Affolter, Vice President-Nuclear Operations of Union Electric Company, has resigned to pursue other opportunities. This combined Form 8-K is being filed separately by Ameren, Union Electric Company, Central Illinois Public Service Company, Ameren Energy Generating Company, CILCORP Inc. and Central Illinois Light Company (each, a "registrant"). Information contained herein relating to any individual registrant has been filed by such registrant on its own behalf. No registrant makes any representation as to information relating to any other registrant. 3 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, each registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. The signature for each undersigned company shall be deemed to relate only to matters having reference to such company or its subsidiaries. AMEREN CORPORATION (Registrant) /s/ Martin J. Lyons --------------------------------------- Martin J. Lyons Vice President and Controller (Principal Accounting Officer) UNION ELECTRIC COMPANY (Registrant) /s/ Martin J. Lyons --------------------------------------- Martin J. Lyons Vice President and Controller (Principal Accounting Officer) CENTRAL ILLINOIS PUBLIC SERVICE COMPANY (Registrant) /s/ Martin J. Lyons --------------------------------------- Martin J. Lyons Vice President and Controller (Principal Accounting Officer) AMEREN ENERGY GENERATING COMPANY (Registrant) /s/ Martin J. Lyons --------------------------------------- Martin J. Lyons Vice President and Controller (Principal Accounting Officer) 4 CILCORP Inc. (Registrant) /s/ Martin J. Lyons --------------------------------------- Martin J. Lyons Vice President and Controller (Principal Accounting Officer) CENTRAL ILLINOIS LIGHT COMPANY (Registrant) /s/ Martin J. Lyons --------------------------------------- Martin J. Lyons Vice President and Controller (Principal Accounting Officer) Date: September 1, 2004 5