Exhibit 24.1

                                POWER OF ATTORNEY

     WHEREAS, AMEREN CORPORATION,  a Missouri corporation (herein referred to as
the "Company"), is required to file with the Securities and Exchange Commission,
under the  provisions of the  Securities  Exchange Act of 1934, as amended,  its
annual report on Form 10-K for the year ended December 31, 2003; and

     WHEREAS,  each of the below  undersigned holds the office or offices in the
Company set opposite his or her name;

     NOW,  THEREFORE,  each of the undersigned  hereby  constitutes and appoints
Gary L.  Rainwater  and/or Warner L. Baxter  and/or  Steven R.  Sullivan  and/or
Martin J. Lyons and/or Jerre E.  Birdsong the true and lawful  attorneys-in-fact
of the undersigned,  for and in the name, place and stead of the undersigned, to
affix the name of the undersigned to said Form 10-K and any amendments  thereto,
and, for the  performance of the same acts,  each with power to appoint in their
place and stead and as their substitute,  one or more  attorneys-in-fact for the
undersigned,  with full power of revocation; hereby ratifying and confirming all
that said attorneys-in-fact may do by virtue hereof.

     IN WITNESS WHEREOF, the undersigned have hereunto set their hands this 13th
day of February 2004:

<TABLE>
<S>                                                         <C>
Gary L. Rainwater, Chairman, President,
   Chief Executive Officer and Director
   (Principal Executive Officer)                                       /s/ G. L. Rainwater
                                                              ------------------------------------------------

William E. Cornelius, Director                                         /s/ W. E. Cornelius
                                                              ------------------------------------------------

Susan S. Elliott, Director                                             /s/ Susan S. Elliott
                                                              ------------------------------------------------

Clifford L. Greenwalt, Director                                        /s/ Clifford L. Greenwalt
                                                              ------------------------------------------------

Thomas A. Hays, Director                                               /s/ Thomas A. Hays
                                                              ------------------------------------------------

Richard A. Liddy, Director                                             /s/ Richard A. Liddy
                                                              ------------------------------------------------

Gordon R. Lohman, Director                                             /s/ G. R. Lohman
                                                              ------------------------------------------------

Richard A. Lumpkin, Director                                           /s/ Richard A. Lumpkin
                                                              ------------------------------------------------

John Peters MacCarthy, Director                                        /s/ John Peters MacCarthy
                                                              ------------------------------------------------

Paul L. Miller, Jr., Director                                          /s/ Paul L. Miller, Jr.
                                                              ------------------------------------------------

Charles W. Mueller, Director                                           /s/ C. W. Mueller
                                                              ------------------------------------------------

Douglas R. Oberhelman, Director                                        /s/ Douglas R. Oberhelman
                                                              ------------------------------------------------

Harvey Saligman, Director                                              /s/ Harvey Saligman
                                                              ------------------------------------------------

Warner L. Baxter, Executive Vice President
   and Chief Financial Officer
   (Principal Financial Officer)                                       /s/ Warner L. Baxter
                                                              ------------------------------------------------

Martin J. Lyons, Vice President and
   Controller
   (Principal Accounting Officer)                                      /s/ Martin J. Lyons
                                                              ------------------------------------------------

</TABLE>
<PAGE>


                                                                    Exhibit 24.1


STATE OF MISSOURI        )
                         )  SS.
CITY OF ST. LOUIS        )

     On this 13th day of  February,  2004,  before  me, the  undersigned  Notary
Public in and for said State,  personally appeared the above-named  officers and
directors of Ameren Corporation,  known to me to be the persons described in and
who executed the foregoing  power of attorney and  acknowledged  to me that they
executed the same as their free act and deed for the purposes therein stated.

     IN TESTIMONY  WHEREOF,  I have hereunto set my hand and affixed my official
seal.


                                                 /s/ S. A. Kitchens
                                    --------------------------------------------
                                                     S. A. Kitchens
                                              Notary Public - Notary Seal
                                                    STATE OF MISSOURI
                                                    St. Louis County
                                          My Commission Expires:  July 9, 2007