News Releases

Illinois Power Company, a subsidiary of Ameren Corporation (NYSE: AEE) doing business as AmerenIP, announced today the results of its cash tender offer for its Mortgage Bonds, 11.50% Series due 2010 ("Bonds") that was announced on Oct. 15, 2004. AmerenIP has accepted for purchase approximately $350,970,000 aggregate principal amount of its Bonds, which represents 98.17% of the $357,500,000 aggregate principal amount of its Bonds that remains outstanding. This purchase follows a separate redemption of $192,500,000 aggregate principal amount of these Bonds on Nov. 15, 2004. The cash tender offer price was $1,214.20 per $1,000 principal amount of Bonds plus accrued and unpaid interest on the Bonds to the settlement date, which is scheduled for Wednesday, Nov. 24, 2004.

AmerenIP, a regulated utility based in Decatur, Ill., serves more than 590,000 electricity customers and nearly 415,000 natural gas customers over 15,000 square miles in northern, central and southern Illinois. With assets of $18 billion, Ameren, through its subsidiaries, serves 2.3 million electric customers and 900,000 natural gas customers over a 64,000 square-mile area of Missouri and Illinois.

This release contains forward-looking statements, which are subject to various risks and uncertainties. Discussion of risks and uncertainties that could cause actual results to differ materially from management's current projections, forecasts, estimates and expectations is contained in the company's SEC filings. In addition to the risks and uncertainties set forth in AmerenIP's SEC filings on Forms 10-K and 10-Q, the amount of Bonds being purchased is subject to final confirmation of the validity of tenders submitted.

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