Ameren CEO, CFO to Present at EEI Conference.

ST. LOUIS -- Ameren Corporation (NYSE:AEE) President, Chairman and Chief Executive Officer Gary Rainwater and Executive Vice President and Chief Financial Officer Warner Baxter will give an analyst presentation on Tuesday, Oct. 26, 2004 at the Edison Electric Institute (EEI) 39th Annual Financial Conference. The presentation will be at 12:45 p.m. Eastern Time (11:45 a.m. Central Time, 9:45 a.m. Pacific Time).

This presentation is being webcast by Thomson/CCBN and can be accessed at Ameren's Web site at www.ameren.com.

The webcast is also being distributed through the Thomson StreetEvents Network to both institutional and individual investors. Individual investors can listen to the presentation at www.fulldisclosure.com, Thomson/CCBN's individual investor portal, powered by StreetEvents. Institutional investors can access the presentation via Thomson's password-protected event management site, StreetEvents (www.streetevents.com).

About Ameren

With assets of $17 billion, Ameren owns a diverse mix of electric generating plants strategically located in its Midwest market with a capacity of more than 14,800 megawatts. Ameren serves 2.3 million electric customers and 900,000 natural gas customers in a 64,000 square- mile area of Missouri and Illinois.