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CILCORP Inc. Extends Expiration Date of Its Tender Offer and Consent Solicitation
PRNewswire-FirstCall
PEORIA, Ill.
(NYSE:AEE)

PEORIA, Ill., Sept. 29 /PRNewswire-FirstCall/ -- CILCORP Inc., a wholly owned subsidiary of Ameren Corporation (NYSE: AEE), announced today that it is extending the expiration date of its previously announced cash tender offer (the "tender offer") for any and all of its outstanding 8.700% senior notes due 2009 (CUSIP No. 171794 AE0) (the "2009 notes") and 9.375% senior bonds due 2029 (CUSIP No. 171794 AF7) (the "2029 notes" and, together with the 2009 notes, the "notes") from midnight, New York City time, on September 30, 2008 to 5:00 p.m., New York City time, on October 17, 2008, unless further extended or earlier terminated by CILCORP in its sole discretion. The consent date, the last date and time for holders to tender notes in order to receive the applicable total consideration (as defined in the offer to purchase described below), expired at 5:00 p.m., New York City time, on September 16, 2008 and is not being extended.

Holders who previously have tendered their notes do not need to re-tender their notes or to take any other action in response to the above extension. As of 5:00 p.m., New York City time on September 26, 2008, in connection with the related concurrent consent solicitation (the "consent solicitation"), CILCORP has received consents from the holders of $122.8 million, or 99.3%, of the outstanding 2009 notes and $210.4 million, or 99.9%, of the 2029 notes. In accordance with the terms of the offer to purchase and consent solicitation statement dated September 3, 2008 ("offer to purchase") and the related letter of transmittal and consent, tendered notes may no longer be withdrawn and related consents may no longer be revoked, unless the tender offer and consent solicitation are terminated.

Except for the extension described above, the complete terms and conditions of the tender offer and the consent solicitation are set forth in the offer to purchase and the related letter of transmittal and consent and remain in full force and effect.

Consummation of the tender offer and the consent solicitation is subject to a number of conditions, including the absence of certain adverse legal and market developments, as described in the offer to purchase. CILCORP has reserved the right to amend, further extend, terminate, or waive any conditions to the tender offer and the consent solicitation at any time.

J.P. Morgan Securities Inc. is the Dealer Manager for the tender offer and the consent solicitation and may be contacted at 212-834-4802 (collect calls accepted) or toll free at 866-834-4666. Requests for documents may be directed to Global Bondholder Services Corporation, the Information Agent for the tender offer and the consent solicitation, at 212-430-3774 (collect calls accepted) or toll free at 866-857-2200.

This press release does not constitute an offer or an invitation by CILCORP to participate in the tender offer or the consent solicitation in any jurisdiction in which it is unlawful to make such an offer or solicitation in such jurisdiction. The tender offer and the consent solicitation are only being made pursuant to the offer to purchase and the related letter of transmittal and consent.

CILCORP Inc. is an Ameren Corporation subsidiary that operates as a holding company for Central Illinois Light Company ("CILCO") and a non-rate-regulated subsidiary. CILCO operates a rate-regulated electric and natural gas transmission and distribution business and a non-rate-regulated electric generation business through its subsidiary, AmerenEnergy Resources Generating Company, all in Illinois. CILCO supplies electric and gas utility service to portions of central and east central Illinois in areas of 3,700 and 4,500 square miles, respectively, with an estimated population of 1 million. CILCO supplies electric service to 210,000 customers and natural gas service to 213,000 customers. AmerenEnergy Resources Generating Company owns 1,074 megawatts of coal-fired electric generating capacity and 55 megawatts of natural gas and oil-fired electric generating capacity.

SOURCE: Ameren Corporation

CONTACT: Media, Tim Fox, +1-314-554-3120, tfox@ameren.com, or Analysts,
Douglas Fischer, +1-314-554-4859, dfischer@ameren.com, or Investors,
1-800-255-2237, invest@ameren.com, all of Ameren Corporation

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