UNITED STATES
                       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):
                                October 10, 2003





                        AMEREN ENERGY GENERATING COMPANY
             (Exact name of registrant as specified in its charter)




        Illinois                        333-56594               37-1395586
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 5. OTHER EVENTS AND REGULATION FD DISCLOSURE.

The following  changes in the directors and officers of Ameren Energy Generating
Company were announced on October 10, 2003:

o    Thomas R. Voss,  Senior Vice  President,  was elected  President  effective
     October 10, 2003 replacing Daniel F. Cole.

o    Paul A. Agathen, director and Senior Vice President will retire from Ameren
     Energy Generating Company and in conjunction  therewith will relinquish his
     directorship effective October 10, 2003.

o    Thomas R. Voss was  elected to fill the  vacancy on the board of  directors
     created by Mr. Agathen's retirement effective October 10, 2003.

o    Charles W. Mueller, director, will retire on December 31, 2003.

o    Steven R. Sullivan,  Vice President Regulatory Policy,  General Counsel and
     Secretary,  was  elected  Senior  Vice  President   Governmental/Regulatory
     Policy,  General  Counsel and  Secretary  effective  October 10, 2003.  Mr.
     Sullivan was elected to fill the vacancy on the board of directors  created
     by Mr. Mueller's retirement effective January 1, 2004.

o    Warner L. Baxter,  Senior Vice President  (principal financial officer) and
     director,  was elected Executive Vice President and Chief Financial Officer
     effective October 10, 2003.



                                    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 ENERGY GENERATING COMPANY
                                        (Registrant)


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

Date:  October 10, 2003

                                        2
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UNITED STATES
                       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):
                                October 10, 2003

                        AMEREN ENERGY GENERATING COMPANY
             (Exact name of registrant as specified in its charter)

        Illinois                        333-56594               37-1395586
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 5. OTHER EVENTS AND REGULATION FD DISCLOSURE.

The following  changes in the directors and officers of Ameren Energy Generating
Company were announced on October 10, 2003:

o    Thomas R. Voss,  Senior Vice  President,  was elected  President  effective
     October 10, 2003 replacing Daniel F. Cole.

o    Paul A. Agathen, director and Senior Vice President will retire from Ameren
     Energy Generating Company and in conjunction  therewith will relinquish his
     directorship effective October 10, 2003.

o    Thomas R. Voss was  elected to fill the  vacancy on the board of  directors
     created by Mr. Agathen's retirement effective October 10, 2003.

o    Charles W. Mueller, director, will retire on December 31, 2003.

o    Steven R. Sullivan,  Vice President Regulatory Policy,  General Counsel and
     Secretary,  was  elected  Senior  Vice  President   Governmental/Regulatory
     Policy,  General  Counsel and  Secretary  effective  October 10, 2003.  Mr.
     Sullivan was elected to fill the vacancy on the board of directors  created
     by Mr. Mueller's retirement effective January 1, 2004.

o    Warner L. Baxter,  Senior Vice President  (principal financial officer) and
     director,  was elected Executive Vice President and Chief Financial Officer
     effective October 10, 2003.

                                    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 ENERGY GENERATING COMPANY
                                        (Registrant)

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

Date:  October 10, 2003

                                        2