Ameren Illinois Company Directors Declare Quarterly Dividends

The board of directors of Ameren Illinois Company, a subsidiary of Ameren Corporation

, today declared a quarterly dividend on all classes of Ameren Illinois Company preferred stock. Ameren Illinois Company

was established today with the completed merger of Ameren's three Illinois electric and natural gas utilities – Central Illinois Public Service Company, formerly doing business as AmerenCIPS; Central Illinois Light Company, formerly doing business as AmerenCILCO; and Illinois Power Company, formerly doing business as AmerenIP. The preferred stock dividend to holders of Ameren Illinois preferred stock of the 4.08% series, 4.20% series, 4.26% series, 4.42% series, 4.70% series and 7.75% series is payable on Nov. 1, 2010, to shareholders of record on Oct. 12, 2010. The preferred stock dividend to holders of Ameren Illinois preferred stock of the 4.00% series, 4.25% series, 4.90% series, 4.92% series, 5.16% series and 6.625% series is payable on Dec. 31, 2010, to shareholders of record Dec. 8, 2010.