The common share dividend is payable March 31, 2010, to shareholders of record on March 10, 2010.

Separately, the boards of directors of the following Ameren Corporation operating subsidiaries declared regular quarterly dividends on all classes of the subsidiaries' preferred stock on Feb.11, 2010. The Central Illinois Light Company (AmerenCILCO) preferred stock dividend is payable April 1, 2010, to shareholders of record on March 5, 2010. The Central Illinois Public Service Company (AmerenCIPS) preferred stock dividend is payable June 30, 2010, to shareholders of record on June 9, 2010. The Illinois Power Company (AmerenIP) preferred stock dividend is payable May 3, 2010, to shareholders of record on April 12, 2010. The Union Electric Company (AmerenUE) preferred stock dividend is payable May 15, 2010, to shareholders of record on April 20, 2010.

With assets of approximately $24 billion, Ameren serves 2.4 million electric customers and one million natural gas customers in a 64,000-square-mile area of Missouri and Illinois.