Exhibit 99.3





                                   CERTIFICATE
                                 furnished under
                 Section 906 of the Sarbanes-Oxley Act of 2002.

     I, Warner L. Baxter, chief financial officer of Ameren Corporation,  hereby
certify  that to the best of my  knowledge,  the  accompanying  Report of Ameren
Corporation  on Form 10-K for the fiscal  year  ended  December  31,  2002 fully
complies  with the  requirements  of  Section  13(a) or 15(d) of the  Securities
Exchange  Act of 1934 and  that  information  contained  in such  Report  fairly
presents,  in all material  respects,  the  financial  condition  and results of
operations of Ameren Corporation.



                                                  /s/ Warner L. Baxter
                                                  ------------------------------
                                                  Warner L. Baxter
                                                  Chief Financial Officer

Date:  March 31, 2003



A signed  original of this  written  statement  required by Section 906 has been
provided to Ameren  Corporation  and will be retained by Ameren  Corporation and
furnished to the Securities and Exchange Commission or its staff upon request.