Edgar Filing: UNION ELECTRIC CO

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

Reference is made to Note 3 - Rate and Regulatory Matters to our financial statements under Part II, Item 8; Outlook under Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations; and Part I, Item 1A. Risk Factors, all in the Annual Report on Form 10-K for the fiscal year ended December 31, 2006; and Note 2 - Rate and Regulatory Matters to our financial statements under Part I, Item 1; Outlook under Part I, Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations; and Part II, Item 1A. Risk Factors, all in the Form 10-Q for the quarterly period ended March 31, 2007, of registrant Ameren Corporation and its registrant subsidiary, Union Electric Company, doing business as AmerenUE (“UE”), for a discussion of the rate case filed with the Missouri Public Service Commission (“MoPSC”) by UE in July 2006 which originally requested an increase in base rates for electric service of $361 million. On May 22, 2007, the MoPSC issued an order, effective June 1, 2007, (which is subject to appeal) authorizing approximately a $43 million increase in UE’s base rates for electric service based on a return on equity of 10.2%. Under generally accepted accounting principles, UE will conform the accounting for certain expenses, including a reduction in depreciation expense, with the treatment prescribed in the MoPSC rate order. UE’s request to utilize a fuel and purchased power cost recovery mechanism was denied, but UE’s existing treatment of the December 2005 expiration of a cost-based power supply contract between UE and its affiliate, Electric Energy, Inc. was accepted by the MoPSC. UE continues to evaluate the order.