Company Update

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C.  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 4, 2009   Commission File Number Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number   IRS Employer Identification Number 1-14756 Ameren Corporation (Missouri Corporation) 1901 Chouteau Avenue St. Louis, Missouri 63103 (314) 621-3222   43-1723446 1-2967 Union Electric Company (Missouri Corporation) 1901 Chouteau Avenue St. Louis, Missouri 63103 (314) 621-3222   43-0559760 1-3672 Central Illinois Public Service Company (Illinois Corporation) 607 East Adams Street Springfield, Illinois 62739 (217) 523-3600   37-0211380 333-56594 Ameren Energy Generating Company (Illinois Corporation) 1901 Chouteau Avenue St. Louis, Missouri 63103 (314) 621-3222   37-1395586   2-95569 CILCORP Inc. (Illinois Corporation) 300 Liberty Street Peoria, Illinois 61602 (309) 677-5271   37-1169387         1-2732 Central Illinois Light Company (Illinois Corporation) 300 Liberty Street Peoria, Illinois 61602 (309) 677-5271   37-0211050 1-3004 Illinois Power Company (Illinois Corporation) 370 South Main Street Decatur, Illinois 62523 (217) 424-6600 37-0344645 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-   ITEM 8.01         Other Events.   Reference is made to Overview and Outlook in Management’s Discussion and Analysis of Financial Condition and Results of Operations under Part I, Item 2, in the Form 10-Q for the quarterly period ended June 30, 2009, of registrant Ameren Corporation (“Ameren”) and its registrant subsidiaries, Union Electric Company, doing business as AmerenUE (“UE”), Central Illinois Public Service Company, doing business as AmerenCIPS (“CIPS”), Ameren Energy Generating Company (“Genco”), CILCORP Inc. (“CILCORP”), Central Illinois Light Company, doing business as AmerenCILCO (“CILCO”), and Illinois Power Company, doing business as AmerenIP (“IP”), for a discussion of Ameren’s review of its planned operations and maintenance expenses and certain planned and potential cost-containment actions in connection therewith. On September 4, 2009, Ameren announced that, as part of its efforts to reduce its operations and maintenance expenses, it is initiating a system-wide voluntary separation election program for approximately 350 management employees (excluding senior executive officers) who are 58 years of age or older as of December 31, 2009. This program is being offered to eligible employees at each of Ameren's subsidiaries, including registrants UE, CIPS, Genco, CILCORP, CILCO and IP.  Employees who accept the separation offer will receive severance payments based on years of service in accordance with Ameren's severance plan for management employees. Employees must decide whether to accept the separation offer by October 22, 2009, and those accepting will be leaving their employment by November 1, 2009, subject to any business continuity needs. The effect of this separation program on the results of operations and financial position of Ameren and its registrant subsidiaries cannot be determined until such time as the number and position of those employees separated have been determined; however, Ameren expects to record an unusual charge to earnings during 2009 related to the program which could be up to $30 million if all eligible employees accepted the offer. Ameren also announced that, upon completion of the voluntary separation election program, based on the level of participation in the voluntary separation program and other business reasons, it will pursue a targeted involuntary employee separation program. - - - - - - - - - - - - - - - - - - - - This combined Form 8-K is being filed separately by Ameren, UE, CIPS, Genco, CILCORP, CILCO and IP.  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 Senior Vice President and Chief Financial Officer UNION ELECTRIC COMPANY (Registrant) /s/ Martin J. Lyons                                                                                             Martin J. Lyons Senior Vice President and Chief Financial Officer CENTRAL ILLINOIS PUBLIC SERVICE COMPANY (Registrant) /s/ Martin J. Lyons                                                                                             Martin J. Lyons Senior Vice President and Chief Financial Officer AMEREN ENERGY GENERATING COMPANY (Registrant) /s/ Martin J. Lyons                                                                                             Martin J. Lyons Senior Vice President and Chief Financial Officer CILCORP Inc. (Registrant) /s/ Martin J. Lyons                                                                                             Martin J. Lyons Senior Vice President and Chief Financial Officer     -4-   CENTRAL ILLINOIS LIGHT COMPANY (Registrant) /s/ Martin J. Lyons                                                                                             Martin J. Lyons Senior Vice President and Chief Financial Officer ILLINOIS POWER COMPANY (Registrant) /s/ Martin J. Lyons                                                                                             Martin J. Lyons Senior Vice President and Chief Financial Officer   Date:  September 4, 2009     -5-