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Ameren Reaches Agreement In Illinois Commerce Commission Case Involving Illinois Power Acquisition
Ameren Corporation (NYSE: AEE) today announced that parties participating in its case pending before the Illinois Commerce Commission (ICC) for the approval of Ameren's proposed acquisition of Illinois Power Company have resolved all issues raised in the proceeding. The terms of the resolution of these issues are consistent, in all material respects, with Ameren's expectations at the time it entered into the proposed acquisition of Illinois Power Company.

This transaction, including the ultimate resolution of the issues raised in this proceeding by the parties, is subject to approval by the ICC. Information related to the case can be obtained from the ICC website at http://www.icc.state.il.us.

Ameren announced on Feb. 3, 2004, the proposed $2.3 billion purchase from Dynegy Inc. (NYSE: DYN) of the stock of Decatur, Ill.-based Illinois Power Company and Dynegy's 20 percent interest in Electric Energy, Inc., owner of a Joppa, Ill., coal-fired power plant. Ameren has received approval of the acquisition from the Federal Energy Regulatory Commission and the Federal Communications Commission. In addition, the waiting period under the Hart- Scott-Rodino Act expired without a request by the Federal Trade Commission and the Antitrust Division of the Department of Justice for additional information or documents. Ameren's completion of this acquisition also requires approval from the U.S. Securities and Exchange Commission, under the Public Utility Holding Company Act of 1935, and is subject to customary closing conditions.

Ameren Executive Vice President and Chief Financial Officer Warner L. Baxter will speak Wednesday, Sept. 8, at 9:45 a.m. (EDT) at Lehman Brothers 2004 CEO Energy/Power Conference. He will present an overview of Ameren's financial performance and business strategy, including information related to the IP acquisition process.

This discussion will be available on a live audio Webcast from 9:45 a.m. to 10:20 a.m. (EDT) via a link on the Investors/Presentations section of Ameren's Web site, www.ameren.com. It will be available approximately one hour after the presentation for one year. Slides for the presentation will be posted on the Ameren Web site.

With assets of $14.7 billion, Ameren owns a diverse mix of electric generating plants strategically located in its Midwest market with a capacity of more than 14,600 megawatts. Ameren serves 1.7 million electric customers and 500,000 natural gas customers in a 49,000 square-mile area of Missouri and Illinois.

Forward-Looking Statements

Statements made in this release, which are not based on historical facts, are "forward-looking" and, accordingly, involve risks and uncertainties that could cause actual results to differ materially from those discussed. Although such "forward-looking" statements have been made in good faith and are based on reasonable assumptions, there is no assurance that the expected results will be achieved. These statements include (without limitation) statements as to future expectations, beliefs, plans, strategies, objectives, events, conditions, and financial performance. In connection with the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995, the company is providing this cautionary statement to identify important factors that could cause actual results to differ materially from those anticipated. The following factors, in addition to those discussed elsewhere in this release and in past and subsequent filings with the Securities and Exchange Commission, could cause actual results to differ materially from management expectations as suggested by such "forward-looking" statements:

• the closing and timing of Ameren's acquisition of Illinois Power and the impact of any conditions imposed by regulators in connection with their approval thereof;

• difficulties in integrating AmerenCILCO and Illinois Power, if consummated, with Ameren's other businesses; and

• changes in the energy markets, environmental laws or regulations, interest rates or other factors adversely impacting assumptions in connection with the CILCORP and Illinois Power (if consummated) acquisitions.

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