SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549



                                   FORM 8-K/A

                                (AMENDMENT NO. 1)

                                 CURRENT REPORT




     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934



                Date of Report (Date of earliest event reported):
                                January 14, 2004






                Exact Name of Registrant as specified in its charter;
Commission      State of Incorporation;                                         IRS Employer
File Number     Address and Telephone Number                                    Identification No.
- -----------     ----------------------------                                    ------------------
                                                                             
1-14756         Ameren Corporation                                                  43-1723446
                (Missouri Corporation)
                1901 Chouteau Avenue
                St. Louis, Missouri 63103
                (314) 621-3222

1-2967          Union Electric Company                                              43-0559760
                (Missouri Corporation)
                1901 Chouteau Avenue
                St. Louis, Missouri 63103
                (314) 621-3222






                                Explanatory Note
                                ----------------

     This amendment is being filed only to include the conformed signatures that
were inadvertently omitted from a Form 8-K filed on January 14, 2004.

ITEM 5. OTHER EVENTS AND REGULATION FD DISCLOSURE.

     Reference is made to the Current Report on Form 8-K dated December 10, 2003
of Ameren  Corporation and Union Electric Company (AmerenUE) for a discussion of
the  settlement  reached  with  respect to  AmerenUE's  May 2003  request to the
Missouri  Public  Service  Commission  for an increase  in natural gas  delivery
rates. On January 14, 2004, Ameren Corporation issued a press release announcing
that the Missouri  Public  Service  Commission  on January 13, 2004 approved the
settlement  authorizing  new  natural  gas  delivery  rates  that will  increase
AmerenUE's  operating revenues by approximately $13 million annually.  A copy of
the press release is attached hereto as Exhibit 99.1 and is incorporated  herein
by this reference.

     This combined  Form 8-K/A  (Amendment  No. 1) is being filed  separately by
Ameren  Corporation  and  Union  Electric  Company  (Registrants).   Information
contained  herein  relating to any individual  registrant has been filed by such
registrant  on its own behalf.  No  registrant  makes any  representation  as to
information relating to any other registrant.

ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS.

     (a) Financial Statements: Not applicable

     (b) Pro Forma Financial Information: Not applicable

     (c) Exhibits:


     Exhibit
       No.      Description
     -------    -----------

     99.1       Press Release issued on January 14, 2004 by Ameren Corporation.





                                   SIGNATURES

     Pursuant to the  requirements of the Exchange Act, each registrant has duly
caused this  amendment to be signed on its behalf by the  undersigned  thereunto
duly authorized.  The signature for each undersigned  company shall be deemed to
relate only to matters having reference to such company or its subsidiaries.



                                             AMEREN CORPORATION
                                                 (Registrant)

                                             /s/ Martin J. Lyons
                                           -----------------------------
                                                Martin J. Lyons
                                           Vice President and Controller

                                           (Principal Accounting Officer)



                                            UNION ELECTRIC COMPANY
                                                 (Registrant)

                                             /s/ Martin J. Lyons
                                           -----------------------------
                                                Martin J. Lyons
                                           Vice President and Controller

                                           (Principal Accounting Officer)


Date:  January 14, 2004






                                  Exhibit Index
                                  -------------

Exhibit No.                   Description
- ----------                    -----------

     99.1      Press release issued on January 14, 2004 by Ameren Corporation.