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):
                                  July 14, 2004


<TABLE>
<CAPTION>


                               Exact Name of Registrant as specified in its charter;
         Commission            State of Incorporation;                                  IRS Employer
         File Number           Address and Telephone Number                             Identification No.
         -----------           ----------------------------                             ------------------
        <S>                   <C>                                                          <C>
         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

         1-3672                Central Illinois Public Service Company                      37-0211380
                               (Illinois Corporation)
                               607 East Adams Street
                               Springfield, Illinois 62739
                               (217) 523-3600

<PAGE>


         333-56594             Ameren Energy Generating Company                             37-1395586
                               (Illinois Corporation)
                               1901 Chouteau Avenue
                               St. Louis, Missouri 63103
                               (314) 621-3222

         2-95569               CILCORP Inc.                                                 37-1169387
                               (Illinois Corporation)
                               300 Liberty Street
                               Peoria, Illinois 61602
                               (309) 677-5230

         1-2732                Central Illinois Light Company                               37-0211050
                               (Illinois Corporation)
                               300 Liberty Street
                               Peoria, Illinois 61602
                               (309) 677-5230

</TABLE>

<PAGE>

ITEM 5. OTHER EVENTS AND REGULATION FD DISCLOSURE

     Reference is made to Note 4 - Short-term  Borrowings  and  Liquidity to the
financial  statements  under  Part I,  Item 1,  and to  "Liquidity  and  Capital
Resources - Short-term Borrowings and Liquidity" under "Management's  Discussion
and Analysis of Financial  Condition and Results of Operations," in Part I, Item
2, of the Registrants'  combined quarterly report on Form 10-Q for the quarterly
period  ended  March  31,  2004  for a  discussion  of the  Registrants'  credit
facilities and credit agreement provisions.

     On July 14, 2004, Ameren Corporation entered into two new credit agreements
for $700 million in revolving credit facilities to be used for general corporate
purposes, including support of commercial paper programs and the utility and the
non-state regulated subsidiary money pool arrangements.  The $700 million in new
facilities  includes a $350 million  three-year  revolving credit facility and a
$350 million  five-year  revolving credit facility.  These new credit facilities
replaced Ameren  Corporation's  existing $235 million 364-day  revolving  credit
facility,  which  matured  on  July  14,  2004,  and a $130  million  multi-year
revolving credit facility, which would have matured in July 2005. The new credit
facilities contain provisions similar to those in the replaced credit facilities
which,  among other things,  place  restrictions  on the ability to incur liens,
sell assets and merge with other  entities.  They also contain a provision  that
limits Ameren  Corporation's  and its  subsidiaries',  Central  Illinois  Public
Service Company d/b/a AmerenCIPS, Union Electric Company d/b/a AmerenUE, Central
Illinois Light Company d/b/a  AmerenCILCO,  and/or  Illinois Power Company (from
and after the date that is six months after Ameren Corporation's  acquisition of
Illinois  Power  Company),  total  indebtedness  to 60% of total  capitalization
pursuant  to a defined  calculation.  In  addition,  the new  credit  facilities
contain  indebtedness  cross-default  provisions  and  material  adverse  change
clauses,  similar to those  contained in the replaced credit  facilities,  which
could  trigger a default  under  these  facilities  in the event that any of the
Ameren Corporation subsidiaries (as defined), other than certain project finance
subsidiaries,  defaults in indebtedness in excess of $50 million. The new credit
agreements,  like the replaced  facilities,  also require Ameren  Corporation to
meet the minimum funding rules of the Employee Retirement Income Security Act of
1974, as amended.


                                       2


<PAGE>


                                   SIGNATURES

     Pursuant to the  requirements of the Exchange Act, each registrant has duly
caused this report 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)


                                   CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
                                               (Registrant)

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


                                   AMEREN ENERGY GENERATING COMPANY
                                               (Registrant)

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


                                       3
<PAGE>



                                               CILCORP Inc.
                                               (Registrant)

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



                                         Central Illinois Light Company
                                               (Registrant)

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


Date:  July 14, 2004



                                       4
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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):
                                  July 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

         1-3672                Central Illinois Public Service Company                      37-0211380
                               (Illinois Corporation)
                               607 East Adams Street
                               Springfield, Illinois 62739
                               (217) 523-3600
333-56594             Ameren Energy Generating Company                             37-1395586
                               (Illinois Corporation)
                               1901 Chouteau Avenue
                               St. Louis, Missouri 63103
                               (314) 621-3222

         2-95569               CILCORP Inc.                                                 37-1169387
                               (Illinois Corporation)
                               300 Liberty Street
                               Peoria, Illinois 61602
                               (309) 677-5230

         1-2732                Central Illinois Light Company                               37-0211050
                               (Illinois Corporation)
                               300 Liberty Street
                               Peoria, Illinois 61602
                               (309) 677-5230
ITEM 5. OTHER EVENTS AND REGULATION FD DISCLOSURE

     Reference is made to Note 4 - Short-term  Borrowings  and  Liquidity to the
financial  statements  under  Part I,  Item 1,  and to  "Liquidity  and  Capital
Resources - Short-term Borrowings and Liquidity" under "Management's  Discussion
and Analysis of Financial  Condition and Results of Operations," in Part I, Item
2, of the Registrants'  combined quarterly report on Form 10-Q for the quarterly
period  ended  March  31,  2004  for a  discussion  of the  Registrants'  credit
facilities and credit agreement provisions.

     On July 14, 2004, Ameren Corporation entered into two new credit agreements
for $700 million in revolving credit facilities to be used for general corporate
purposes, including support of commercial paper programs and the utility and the
non-state regulated subsidiary money pool arrangements.  The $700 million in new
facilities  includes a $350 million  three-year  revolving credit facility and a
$350 million  five-year  revolving credit facility.  These new credit facilities
replaced Ameren  Corporation's  existing $235 million 364-day  revolving  credit
facility,  which  matured  on  July  14,  2004,  and a $130  million  multi-year
revolving credit facility, which would have matured in July 2005. The new credit
facilities contain provisions similar to those in the replaced credit facilities
which,  among other things,  place  restrictions  on the ability to incur liens,
sell assets and merge with other  entities.  They also contain a provision  that
limits Ameren  Corporation's  and its  subsidiaries',  Central  Illinois  Public
Service Company d/b/a AmerenCIPS, Union Electric Company d/b/a AmerenUE, Central
Illinois Light Company d/b/a  AmerenCILCO,  and/or  Illinois Power Company (from
and after the date that is six months after Ameren Corporation's  acquisition of
Illinois  Power  Company),  total  indebtedness  to 60% of total  capitalization
pursuant  to a defined  calculation.  In  addition,  the new  credit  facilities
contain  indebtedness  cross-default  provisions  and  material  adverse  change
clauses,  similar to those  contained in the replaced credit  facilities,  which
could  trigger a default  under  these  facilities  in the event that any of the
Ameren Corporation subsidiaries (as defined), other than certain project finance
subsidiaries,  defaults in indebtedness in excess of $50 million. The new credit
agreements,  like the replaced  facilities,  also require Ameren  Corporation to
meet the minimum funding rules of the Employee Retirement Income Security Act of
1974, as amended.

                                       2
SIGNATURES

     Pursuant to the  requirements of the Exchange Act, each registrant has duly
caused this report 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)

                                   CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
                                               (Registrant)

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

                                   AMEREN ENERGY GENERATING COMPANY
                                               (Registrant)

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

                                       3
CILCORP Inc.
                                               (Registrant)

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

                                         Central Illinois Light Company
                                               (Registrant)

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

Date:  July 14, 2004

                                       4