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AmerenIP Announces Consummation of Exchange Offer

ST. LOUIS, April 16 /PRNewswire-FirstCall/ -- Illinois Power Company, a wholly owned subsidiary of Ameren Corporation (NYSE: AEE) doing business as AmerenIP, announced today that it has completed its offer to exchange up to $250 million principal amount of its unregistered 6.125% senior secured notes due 2017 (the "Notes") for a like amount of its 6.125% senior secured notes due 2017, which have been registered under the Securities Act of 1933. The exchange offer and withdrawal rights expired at 5 p.m. EST on Friday, Apr. 11, 2008, at which time $250 million principal amount of Notes had been tendered and not withdrawn. AmerenIP has accepted for exchange all Notes validly tendered and not withdrawn prior to the expiration of the exchange offer.

AmerenIP is a subsidiary of St. Louis-based Ameren Corporation. Ameren companies serve 2.4 million electric customers and one million natural gas customers in a 64,000-square-mile area of Missouri and Illinois.

SOURCE: Ameren Corporation

CONTACT: Media, Tim Fox, +1-314-554-3120, TFox@ameren.com, or Analysts,
Bruce Steinke, +1-314-554-2574, BSteinke@ameren.com, or Investors, Investor
Services, 1-800-255-2237, invest@ameren.com, all of Ameren Corporation

Web site: http://www.ameren.com/