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):
                                  May 30, 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.

     Reference is made to "Regulatory  Matters" under  "Management's  Discussion
and Analysis of Financial Condition and Results of Operations" and "Intercompany
Sale of Electric Generating  Facilities" under Note 2 to the "Notes to Financial
Statements" of the  Registrant's  Form 10-Q for the quarterly period ended March
31, 2003, for a discussion of the  Registrant's  proposed sale to its affiliate,
Union  Electric  Company,  which  operates as  AmerenUE,  of  approximately  550
megawatts of combustion  turbine generating units at Pinckneyville and Kinmundy,
Illinois,  and for a discussion of the status of the related  proceedings before
the  Illinois  Commerce  Commission  (ICC)  and the  Federal  Energy  Regulatory
Commission (FERC).

     On May 30,  2003,  AmerenUE  filed a  Notice  of  Withdrawal  with  the ICC
notifying it that AmerenUE had elected not to pursue approval of the transaction
and was  withdrawing  its  request.  In the  Notice,  AmerenUE  states  that the
concerns expressed by the ICC Staff regarding AmerenUE's means of satisfying its
generating   capacity  needs,   juxtaposed  with  the  Missouri  Public  Service
Commission's  (MoPSC)  views  of the  appropriate  means of  meeting  generating
capacity  obligations,  have demonstrated to AmerenUE the difficulty of a single
company  operating  as an  electric  utility  in  both  a  regulated  generation
jurisdiction such as Missouri and an unregulated generation jurisdiction such as
Illinois.  To remedy this difficulty,  AmerenUE announced in the Notice its plan
to  limit  its  public  utility  operations  to the  State  of  Missouri  and to
discontinue  operating as a public utility subject to ICC  regulation.  AmerenUE
intends to accomplish this plan by transferring its Illinois-based  electric and
natural gas businesses,  including its  Illinois-based  distribution  assets and
personnel and certain of its transmission assets, to another affiliate,  Central
Illinois  Public  Service  Company,  which  operates as  AmerenCIPS.  AmerenUE's
electric  generating   facilities  and  certain  of  its  electric  transmission
facilities  in  Illinois  would not be part of the  transfer.  The  transfer  of
AmerenUE's  Illinois-based  utility  businesses will require the approval of the
ICC, the FERC, the MoPSC and the Securities and Exchange  Commission (SEC) under
the provisions of the Public Utility Holding Company Act of 1935 (PUHCA).

     Upon receipt of these  regulatory  approvals and completion of the transfer
of its Illinois-based  utility businesses,  AmerenUE,  as it states in the above
referenced  Notice of  Withdrawal,  will no longer be subject to regulation as a
public utility by the ICC and as a result,  the ICC's approval will no longer be
required for the Pinckneyville and Kinmundy  combustion turbine generating units
to be  transferred  from the Registrant to AmerenUE.  The Registrant  intends to
continue with the sale of these electric generating facilities and will continue
to seek approvals from regulators having jurisdiction over the transaction.  The
FERC is required to approve the transaction.  As stated previously, ICC approval
will no longer be necessary.  Further, the MoPSC is not required to approve this
transaction;  however,  the MoPSC has stated in filings  with the FERC that this
transaction  is  consistent  with and  supported by the AmerenUE  electric  rate
settlement  approved by the MoPSC in August 2002.  Due to the fact that no state
regulatory  bodies will  approve this  transaction,  the SEC will be required to
approve this transaction under the PUHCA.

     The  Registrant  is unable to  predict  the  ultimate  outcome of the above
referenced  regulatory  proceedings or the timing of the final  decisions of the
various  agencies.  As a result,  the  Registrant,  at this  time,  is unable to
estimate the impact of these transactions on its financial position,  results of
operations or liquidity.

<PAGE>


                                    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:  June 2, 2003
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{"company-data": {"conformed-name": "AMERENENERGY GENERATING CO", "cik": "0001135361", "assigned-sic": "4911", "irs-number": "371395586", "state-of-incorporation": "IL", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "333-56594", "film-number": "03727653"}, "business-address": {"street1": "1901 CHOUTEAU AVENUE", "city": "ST LOUIS", "state": "MO", "zip": "63103", "phone": "3145543922"}, "mail-address": {"street1": "1901 CHOUTEAU AVENUE", "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):
                                  May 30, 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.

     Reference is made to "Regulatory  Matters" under  "Management's  Discussion
and Analysis of Financial Condition and Results of Operations" and "Intercompany
Sale of Electric Generating  Facilities" under Note 2 to the "Notes to Financial
Statements" of the  Registrant's  Form 10-Q for the quarterly period ended March
31, 2003, for a discussion of the  Registrant's  proposed sale to its affiliate,
Union  Electric  Company,  which  operates as  AmerenUE,  of  approximately  550
megawatts of combustion  turbine generating units at Pinckneyville and Kinmundy,
Illinois,  and for a discussion of the status of the related  proceedings before
the  Illinois  Commerce  Commission  (ICC)  and the  Federal  Energy  Regulatory
Commission (FERC).

     On May 30,  2003,  AmerenUE  filed a  Notice  of  Withdrawal  with  the ICC
notifying it that AmerenUE had elected not to pursue approval of the transaction
and was  withdrawing  its  request.  In the  Notice,  AmerenUE  states  that the
concerns expressed by the ICC Staff regarding AmerenUE's means of satisfying its
generating   capacity  needs,   juxtaposed  with  the  Missouri  Public  Service
Commission's  (MoPSC)  views  of the  appropriate  means of  meeting  generating
capacity  obligations,  have demonstrated to AmerenUE the difficulty of a single
company  operating  as an  electric  utility  in  both  a  regulated  generation
jurisdiction such as Missouri and an unregulated generation jurisdiction such as
Illinois.  To remedy this difficulty,  AmerenUE announced in the Notice its plan
to  limit  its  public  utility  operations  to the  State  of  Missouri  and to
discontinue  operating as a public utility subject to ICC  regulation.  AmerenUE
intends to accomplish this plan by transferring its Illinois-based  electric and
natural gas businesses,  including its  Illinois-based  distribution  assets and
personnel and certain of its transmission assets, to another affiliate,  Central
Illinois  Public  Service  Company,  which  operates as  AmerenCIPS.  AmerenUE's
electric  generating   facilities  and  certain  of  its  electric  transmission
facilities  in  Illinois  would not be part of the  transfer.  The  transfer  of
AmerenUE's  Illinois-based  utility  businesses will require the approval of the
ICC, the FERC, the MoPSC and the Securities and Exchange  Commission (SEC) under
the provisions of the Public Utility Holding Company Act of 1935 (PUHCA).

     Upon receipt of these  regulatory  approvals and completion of the transfer
of its Illinois-based  utility businesses,  AmerenUE,  as it states in the above
referenced  Notice of  Withdrawal,  will no longer be subject to regulation as a
public utility by the ICC and as a result,  the ICC's approval will no longer be
required for the Pinckneyville and Kinmundy  combustion turbine generating units
to be  transferred  from the Registrant to AmerenUE.  The Registrant  intends to
continue with the sale of these electric generating facilities and will continue
to seek approvals from regulators having jurisdiction over the transaction.  The
FERC is required to approve the transaction.  As stated previously, ICC approval
will no longer be necessary.  Further, the MoPSC is not required to approve this
transaction;  however,  the MoPSC has stated in filings  with the FERC that this
transaction  is  consistent  with and  supported by the AmerenUE  electric  rate
settlement  approved by the MoPSC in August 2002.  Due to the fact that no state
regulatory  bodies will  approve this  transaction,  the SEC will be required to
approve this transaction under the PUHCA.

     The  Registrant  is unable to  predict  the  ultimate  outcome of the above
referenced  regulatory  proceedings or the timing of the final  decisions of the
various  agencies.  As a result,  the  Registrant,  at this  time,  is unable to
estimate the impact of these transactions on its financial position,  results of
operations or liquidity.
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:  June 2, 2003