SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549



                                    FORM 8-K


                                 CURRENT REPORT




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



                Date of Report (Date of earliest event reported):
                                 April 30, 2003





                               AMEREN CORPORATION
             (Exact name of registrant as specified in its charter)




          Missouri                     1-14756                   43-1723446
(State or other jurisdiction         (Commission              (I.R.S. Employer
      of incorporation)              File Number)            Identification No.)




                 1901 Chouteau Avenue, St. Louis, Missouri 63103
              (Address of principal executive offices and Zip Code)






       Registrant's telephone number, including area code: (314) 621-3222


<PAGE>


ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS.

          (c)  Exhibits.

               99.1  Press release regarding  earnings for the quarterly  period
                     ended  March 31, 2003,  issued on April 30,  2003 by Ameren
                     Corporation (the Registrant).


ITEM 9. REGULATION FD DISCLOSURE.

          On April 30, 2003,  the Registrant  issued a press release  announcing
its earnings for the quarterly period ended March 31, 2003. The press release is
attached  as  Exhibit  99.1  and  is  incorporated  herein  by  reference.  This
information is being  provided  pursuant to Items 9 and 12 of the Current Report
on Form 8-K.


                                    SIGNATURE

          Pursuant to the  requirements of the Securities  Exchange Act of 1934,
the  Registrant  has duly  caused  this report to be signed on its behalf by the
undersigned thereunto duly authorized.

                                           AMEREN CORPORATION
                                              (Registrant)



                                           By        /s/ Martin J. Lyons
                                             -----------------------------------
                                           Name:         Martin J. Lyons
                                           Title: Vice President and Controller
                                                  (Principal Accounting Officer)


Date:  April 30, 2003




                                       2



<PAGE>



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


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

   99.1        -    Press release  regarding  earnings for the quarterly  period
                    ended  March 31,  2003,  issued on April 30,  2003 by Ameren
                    Corporation.


















                                       3
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{"company-data": {"conformed-name": "AMEREN CORP", "cik": "0001002910", "assigned-sic": "4931", "irs-number": "431723446", "state-of-incorporation": "MO", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-14756", "film-number": "03670967"}, "business-address": {"street1": "1901 CHOUTEAU AVE", "street2": "MC 1370", "city": "ST LOUIS", "state": "MO", "zip": "63166-6149", "phone": "431723446"}, "mail-address": {"street1": "1901 CHOUTEAU AVE", "street2": "MC 1370", "city": "ST LOUIS", "state": "MO", "zip": "63103"}}
SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                    FORM 8-K

                                 CURRENT REPORT

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

                Date of Report (Date of earliest event reported):
                                 April 30, 2003

                               AMEREN CORPORATION
             (Exact name of registrant as specified in its charter)

          Missouri                     1-14756                   43-1723446
(State or other jurisdiction         (Commission              (I.R.S. Employer
      of incorporation)              File Number)            Identification No.)

                 1901 Chouteau Avenue, St. Louis, Missouri 63103
              (Address of principal executive offices and Zip Code)

       Registrant's telephone number, including area code: (314) 621-3222
ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS.

          (c)  Exhibits.

               99.1  Press release regarding  earnings for the quarterly  period
                     ended  March 31, 2003,  issued on April 30,  2003 by Ameren
                     Corporation (the Registrant).

ITEM 9. REGULATION FD DISCLOSURE.

          On April 30, 2003,  the Registrant  issued a press release  announcing
its earnings for the quarterly period ended March 31, 2003. The press release is
attached  as  Exhibit  99.1  and  is  incorporated  herein  by  reference.  This
information is being  provided  pursuant to Items 9 and 12 of the Current Report
on Form 8-K.

                                    SIGNATURE

          Pursuant to the  requirements of the Securities  Exchange Act of 1934,
the  Registrant  has duly  caused  this report to be signed on its behalf by the
undersigned thereunto duly authorized.

                                           AMEREN CORPORATION
                                              (Registrant)

                                           By        /s/ Martin J. Lyons
                                             -----------------------------------
                                           Name:         Martin J. Lyons
                                           Title: Vice President and Controller
                                                  (Principal Accounting Officer)

Date:  April 30, 2003

                                       2
Exhibit Index
                                  -------------

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

   99.1        -    Press release  regarding  earnings for the quarterly  period
                    ended  March 31,  2003,  issued on April 30,  2003 by Ameren
                    Corporation.

                                       3