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):
                                September 1, 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>



     Check the  appropriate  box below if the Form 8-K  filing  is  intended  to
simultaneously  satisfy the filing obligation of the registrant under any of the
following provisions:

     [ ] Written  communications  pursuant to Rule 425 under the  Securities Act
(17 CFR 230.425)

     [ ] Soliciting  material pursuant to Rule 14a-12 under the Exchange Act (17
CFR 240.14a-12)

     [ ]  Pre-commencement  communications  pursuant to Rule 14d-2(b)  under the
Exchange Act (17 CFR 240.14d-2(b))

     [ ]  Pre-commencement  communications  pursuant to Rule 13e-4(c)  under the
Exchange Act (17 CFR 240.13e-4(c))

                                       2
<PAGE>


SECTION 5 - CORPORATE GOVERNANCE AND MANAGEMENT
ITEM 5.02 Departure of Directors or Principal  Officers;  Election of Directors;
Appointment of Principal Officers.

     On September 1, 2004, Ameren  Corporation  (Ameren) announced that Garry L.
Randolph will relinquish his  directorship on Union Electric  Company's board of
directors  in  conjunction  with his  retirement  from  Union  Electric  Company
effective December 31, 2004 (refer to Item 8.01 below).


SECTION 8 - OTHER EVENTS
ITEM 8.01 Other Events.

     On September 1, 2004, Ameren announced that Garry L. Randolph,  Senior Vice
President and Chief Nuclear  Officer of Union  Electric  Company and Senior Vice
President of Central Illinois Public Service Company,  Ameren Energy  Generating
Company,  CILCORP Inc. and Central Illinois Light Company, will retire effective
December 31, 2004 and that during 2005,  Mr.  Randolph  will provide  consulting
services to the Ameren companies. It was also announced that Charles D. Naslund,
Vice President of Union  Electric  Company's  Power  Operations was elected Vice
President-Nuclear  Operations  effective  September 1, 2004. Ronald S. Affolter,
Vice  President-Nuclear  Operations of Union Electric  Company,  has resigned to
pursue other opportunities.



     This combined Form 8-K is being filed separately by Ameren,  Union Electric
Company,  Central  Illinois  Public Service  Company,  Ameren Energy  Generating
Company, CILCORP Inc. and Central Illinois Light Company (each, a "registrant").
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.


                                       3
<PAGE>


                                   SIGNATURES

     Pursuant to the  requirements of the Securities  Exchange Act of 1934, 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)


                                       4
<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:  September 1, 2004



                                       5
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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": "041011042"}, "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"}}, {"company-data": {"conformed-name": "CENTRAL ILLINOIS PUBLIC SERVICE CO", "cik": "0000018654", "assigned-sic": "4931", "irs-number": "370211380", "state-of-incorporation": "IL", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-03672", "film-number": "041011046"}, "business-address": {"street1": "607 E ADAMS ST", "city": "SPRINGFIELD", "state": "IL", "zip": "62739", "phone": "3145543356"}, "mail-address": {"street1": "CENTRAL ILLINOIS PUBLIC SERVICE CO", "street2": "607 E ADAMS ST", "city": "SPRINGFIELD", "state": "IL", "zip": "62739"}}, {"company-data": {"conformed-name": "CENTRAL ILLINOIS LIGHT CO", "cik": "0000018651", "assigned-sic": "4931", "irs-number": "370211050", "state-of-incorporation": "IL", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-02732", "film-number": "041011043"}, "business-address": {"street1": "300 LIBERTY ST", "city": "PEORIA", "state": "IL", "zip": "61602", "phone": "3096758810"}, "mail-address": {"street1": "1901 CHOUTEAU AVE", "city": "ST. LOUIS", "state": "MO", "zip": "63103"}}, {"company-data": {"conformed-name": "UNION ELECTRIC CO", "cik": "0000100826", "assigned-sic": "4911", "irs-number": "430559760", "state-of-incorporation": "MO", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-02967", "film-number": "041011047"}, "business-address": {"street1": "1901 CHOUTEAU AVENUE", "street2": "MC 1370", "city": "ST LOUIS", "state": "MO", "zip": "63166", "phone": "3146213222"}, "mail-address": {"street1": "1901 CHOUTEAU AVENUE", "street2": "MC 1370", "city": "ST LOUIS", "state": "MO", "zip": "63166"}}, {"company-data": {"conformed-name": "CILCORP INC", "cik": "0000762129", "assigned-sic": "4931", "irs-number": "371169387", "state-of-incorporation": "IL", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "002-95569", "film-number": "041011044"}, "business-address": {"street1": "300 LIBERTY ST", "street2": "STE 300", "city": "PEORIA", "state": "IL", "zip": "61602", "phone": "3096758810"}, "mail-address": {"street1": "1901 CHOUTEAU AVE MC-1370", "city": "ST. LOUIS", "state": "MO", "zip": "63103"}}, {"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": "041011045"}, "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"}}]
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):
                                September 1, 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
Check the  appropriate  box below if the Form 8-K  filing  is  intended  to
simultaneously  satisfy the filing obligation of the registrant under any of the
following provisions:

     [ ] Written  communications  pursuant to Rule 425 under the  Securities Act
(17 CFR 230.425)

     [ ] Soliciting  material pursuant to Rule 14a-12 under the Exchange Act (17
CFR 240.14a-12)

     [ ]  Pre-commencement  communications  pursuant to Rule 14d-2(b)  under the
Exchange Act (17 CFR 240.14d-2(b))

     [ ]  Pre-commencement  communications  pursuant to Rule 13e-4(c)  under the
Exchange Act (17 CFR 240.13e-4(c))

                                       2
SECTION 5 - CORPORATE GOVERNANCE AND MANAGEMENT
ITEM 5.02 Departure of Directors or Principal  Officers;  Election of Directors;
Appointment of Principal Officers.

     On September 1, 2004, Ameren  Corporation  (Ameren) announced that Garry L.
Randolph will relinquish his  directorship on Union Electric  Company's board of
directors  in  conjunction  with his  retirement  from  Union  Electric  Company
effective December 31, 2004 (refer to Item 8.01 below).

SECTION 8 - OTHER EVENTS
ITEM 8.01 Other Events.

     On September 1, 2004, Ameren announced that Garry L. Randolph,  Senior Vice
President and Chief Nuclear  Officer of Union  Electric  Company and Senior Vice
President of Central Illinois Public Service Company,  Ameren Energy  Generating
Company,  CILCORP Inc. and Central Illinois Light Company, will retire effective
December 31, 2004 and that during 2005,  Mr.  Randolph  will provide  consulting
services to the Ameren companies. It was also announced that Charles D. Naslund,
Vice President of Union  Electric  Company's  Power  Operations was elected Vice
President-Nuclear  Operations  effective  September 1, 2004. Ronald S. Affolter,
Vice  President-Nuclear  Operations of Union Electric  Company,  has resigned to
pursue other opportunities.

     This combined Form 8-K is being filed separately by Ameren,  Union Electric
Company,  Central  Illinois  Public Service  Company,  Ameren Energy  Generating
Company, CILCORP Inc. and Central Illinois Light Company (each, a "registrant").
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.

                                       3
SIGNATURES

     Pursuant to the  requirements of the Securities  Exchange Act of 1934, 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)

                                       4
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:  September 1, 2004

                                       5