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Ameren Announces Election of Four to President and Chief Executive Officer in Charge of the Corporation's Key Business Segments

ST. LOUIS, Dec. 20 /PRNewswire-FirstCall/ -- Gary L. Rainwater, chairman, president and chief executive officer of Ameren Corporation (NYSE: AEE), announced today that effective Jan. 1, 2007, four senior officers -- Warner L. Baxter, Scott A. Cisel, R. Alan Kelley and Thomas R. Voss -- will assume the new positions of president and chief executive officer of each of the corporation's three key business segments and its administrative service company. All four officers will report directly to Rainwater.

"This new structure will align our company's organization and financial reporting more closely with our three distinct areas of business," says Rainwater, adding that the new structure will also improve the company's focus on providing top tier service for customers and bottom-line results for stockholders.

  Today's changes involve the following changes in reporting relationships:

  * Ameren Executive Vice President and Chief Financial Officer Warner L.
    Baxter is elected to the additional position of president and chief
    executive officer of Ameren Services, assuming responsibility for those
    organizations providing finance, strategic planning, technology,
    procurement, environmental and certain other services to the business
    segments.  Senior Vice President-Administration Daniel F. Cole and
    President of AmerenEnergy Fuels & Services (AFS) Michael G. Mueller will
    now report to Baxter.  AFS provides fuel and energy-related products and
    services for Ameren's subsidiary operating companies.

  * Scott A. Cisel, the president of AmerenCILCO, AmerenCIPS and AmerenIP
    (the Illinois rate regulated business segment) is elected to the
    additional positions of chief executive officer of each of these
    companies.  All operations currently reporting to Cisel will continue to
    do so under the new structure.

  * Senior Vice President of Generation R. Alan Kelley is elected president
    and chief executive officer of AmerenEnergy Resources, continuing his
    responsibility for all non rate-regulated generation but adding
    responsibility for non rate-regulated power marketing.  Reporting to
    Kelley will be Andy M. Serri, president of AmerenEnergy Marketing, the
    wholesale and retail power marketing subsidiary.

  * Ameren Executive Vice President and Chief Operating Officer Thomas R.
    Voss is elected to the additional position of president and chief
    executive officer of AmerenUE (Ameren's Missouri rate-regulated
    operations).  He will assume the additional responsibilities of nuclear
    operations headed by Charles D. Naslund, senior vice president and chief
    nuclear officer, and of AmerenEnergy, the power marketing and risk
    management agent for AmerenUE. Vice President Shawn E. Schukar will
    continue to direct AmerenEnergy and will report to Voss.  In addition,
    reporting directly to Voss will be AmerenUE's power generation
    operations under Vice President Mark C. Birk. Continuing to report to
    Voss will be Senior Vice President David A. Whiteley, who directs the
    corporation's electric transmission operations.  Senior Vice President
    of AmerenUE Energy Delivery Richard J. Mark will also continue to report
    to Voss and be responsible for the electric and natural gas distribution
    and customer service operations for AmerenUE.

  * Senior Vice President and Chief Human Resources Officer Donna K. Martin
    and Senior Vice President, General Counsel and Secretary Steven R.
    Sullivan retain their current positions. Both will continue to report to

With assets of $19 billion, Ameren, through its subsidiaries, serves 2.4 million electric customers and 900,000 natural gas customers in a 64,000 square-mile area of Missouri and Illinois.

SOURCE: Ameren Corporation

CONTACT: Investor: Bruce Steinke, +1-314-554-2574, bsteinke@ameren.com,
or Media: Tim Fox, +1-314-554-3120, tfox@ameren.com, both of Ameren

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