Ameren 1st Quarter 2005 Earnings

    Business Editors/Energy Writers

    ST. LOUIS--(BUSINESS WIRE)--April 20, 2005--Ameren Corporation (NYSE: AEE) will hold a conference call to discuss first quarter 2005 results on Thursday, April 28, 2005, at 10:00 a.m. Eastern Time (9 a.m. Central Time).
    This call 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 call at www.fulldisclosure.com, Thomson/CCBN's individual investor portal, powered by StreetEvents. Institutional investors can access the call via Thomson's password-protected event management site, StreetEvents (www.streetevents.com).

    About Ameren

    With assets of more than $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.

--30--AC/cg*

CONTACT: Ameren Corporation Media: Tim Fox, 314-554-3120 tfox@ameren.com or Analysts: Bruce Steinke, 314-554-2574 bsteinke@ameren.com or Investors: Investor Services invest@ameren.com

KEYWORD: MISSOURI INDUSTRY KEYWORD: OIL/GAS ENERGY UTILITIES EARNINGS CONFERENCE CALLS SOURCE: Ameren Corporation

Copyright Business Wire 2005