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):
                                 August 30, 2002





                               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 2.    OTHER EVENTS AND REGULATION FD DISCLOSURE

           On August 30, 2002, the Registrant issued a press release  announcing
that it and  The AES  Corporation  had  received  on that  date  from  the  U.S.
Department  of Justice a Request for  Additional  Information  (Second  Request)
under the Hart-Scott-Rodino Antitrust Improvements Act pertaining to the pending
sale of CILCORP Inc. to the Registrant. The press release is attached as Exhibit
99 and is incorporated herein by reference.


ITEM 7.    EXHIBITS

           (c)  Exhibits.

                99   Press release, dated August 30, 2002, issued by the
                     Registrant.



                                    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:         Controller
                                               (Principal Accounting Officer)


Date:  August 30, 2002








                                       2



<PAGE>



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


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

   99       - Press release dated August 30, 2002, issued by Ameren Corporation.















                                       3


<PAGE>


[GRAPHIC OMITTED][GRAPHIC OMITTED]
                                                                One Ameren Plaza
                                                            1901 Chouteau Avenue
                                                             St. Louis, MO 63103

Contact:

Analysts:                    Media:
Bruce Steinke                Leigh Morris-Illinois       Erica Abbett-St. Louis
(314) 554-2574               (217) 535-5228              (314) 554-2175
                             (217) 416-9606 (cell)

FOR IMMEDIATE RELEASE


          AES AND AMEREN RECEIVE DOJ REQUEST FOR ADDITIONAL INFORMATION
                        REGARDING PENDING SALE OF CILCORP


SPRINGFIELD,  IL,  AUG.  30,  2002-Ameren  Corporation  (NYSE:  AEE) and The AES
Corporation  (NYSE:  AES) announced  today that they have received from the U.S.
Department  of  Justice  (DOJ) a  Request  for  Additional  Information  (Second
Request) under the  Hart-Scott-Rodino  Antitrust  Improvements Act pertaining to
the pending sale of CILCORP Inc. to Ameren.

     The   waiting   period   applicable   to  the   pending   sale   under  the
Hart-Scott-Rodino   Antitrust   Improvements  Act  will  expire  30  days  after
substantial compliance with the Second Request, unless terminated earlier by the
DOJ.  Issuance of a Second Request is not unusual for transactions of this size,
and the companies intend to cooperate fully and respond promptly.

     As previously announced, the transaction is subject to regulatory approvals
by the Illinois Commerce Commission,  the Federal Energy Regulatory  Commission,
the  Securities  and Exchange  Commission  and  expiration of the waiting period
under the Hart-Scott-Rodino Antitrust Improvements Act. Ameren on July 31, 2002,
filed required  notices with the DOJ and the Federal Trade Commission to acquire
CILCORP  from AES.  Ameren  expects  the sale of  CILCORP  to close in the first
quarter of 2003, and under the stock purchase agreement with AES is obligated to
resolve any issues  raised by the DOJ in connection  with its  Hart-Scott-Rodino
Act filing.

                                    --more--

<PAGE>

Add One

     With assets of $10 billion and 2001 revenues of $4.5 billion, Ameren serves
1.5  million  electric   customers  and  300,000  natural  gas  customers  in  a
44,500-square-mile  area of Missouri and  Illinois.  With $1.8 billion in assets
and 2001 revenues of $815 million,  CILCORP's largest subsidiary,  CILCO, serves
200,000 electric and more than 200,000 natural gas customers.

Safe Harbor Statement
---------------------

     This news release may include forward-looking statements. Actual events and
results may differ  materially from those  projected.  Factors that could affect
actual  results  are  discussed  in Ameren's  filings  with the  Securities  and
Exchange  Commission,  and readers are encouraged to read those filings to learn
more about the risk factors associated with Ameren's businesses.

                                      # # #
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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": "02754652"}, "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):
                                 August 30, 2002

                               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 2.    OTHER EVENTS AND REGULATION FD DISCLOSURE

           On August 30, 2002, the Registrant issued a press release  announcing
that it and  The AES  Corporation  had  received  on that  date  from  the  U.S.
Department  of Justice a Request for  Additional  Information  (Second  Request)
under the Hart-Scott-Rodino Antitrust Improvements Act pertaining to the pending
sale of CILCORP Inc. to the Registrant. The press release is attached as Exhibit
99 and is incorporated herein by reference.

ITEM 7.    EXHIBITS

           (c)  Exhibits.

                99   Press release, dated August 30, 2002, issued by the
                     Registrant.

                                    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:         Controller
                                               (Principal Accounting Officer)

Date:  August 30, 2002

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

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

   99       - Press release dated August 30, 2002, issued by Ameren Corporation.

                                       3
[GRAPHIC OMITTED][GRAPHIC OMITTED]
                                                                One Ameren Plaza
                                                            1901 Chouteau Avenue
                                                             St. Louis, MO 63103

Contact:

Analysts:                    Media:
Bruce Steinke                Leigh Morris-Illinois       Erica Abbett-St. Louis
(314) 554-2574               (217) 535-5228              (314) 554-2175
                             (217) 416-9606 (cell)

FOR IMMEDIATE RELEASE

          AES AND AMEREN RECEIVE DOJ REQUEST FOR ADDITIONAL INFORMATION
                        REGARDING PENDING SALE OF CILCORP

SPRINGFIELD,  IL,  AUG.  30,  2002-Ameren  Corporation  (NYSE:  AEE) and The AES
Corporation  (NYSE:  AES) announced  today that they have received from the U.S.
Department  of  Justice  (DOJ) a  Request  for  Additional  Information  (Second
Request) under the  Hart-Scott-Rodino  Antitrust  Improvements Act pertaining to
the pending sale of CILCORP Inc. to Ameren.

     The   waiting   period   applicable   to  the   pending   sale   under  the
Hart-Scott-Rodino   Antitrust   Improvements  Act  will  expire  30  days  after
substantial compliance with the Second Request, unless terminated earlier by the
DOJ.  Issuance of a Second Request is not unusual for transactions of this size,
and the companies intend to cooperate fully and respond promptly.

     As previously announced, the transaction is subject to regulatory approvals
by the Illinois Commerce Commission,  the Federal Energy Regulatory  Commission,
the  Securities  and Exchange  Commission  and  expiration of the waiting period
under the Hart-Scott-Rodino Antitrust Improvements Act. Ameren on July 31, 2002,
filed required  notices with the DOJ and the Federal Trade Commission to acquire
CILCORP  from AES.  Ameren  expects  the sale of  CILCORP  to close in the first
quarter of 2003, and under the stock purchase agreement with AES is obligated to
resolve any issues  raised by the DOJ in connection  with its  Hart-Scott-Rodino
Act filing.

                                    --more--
Add One

     With assets of $10 billion and 2001 revenues of $4.5 billion, Ameren serves
1.5  million  electric   customers  and  300,000  natural  gas  customers  in  a
44,500-square-mile  area of Missouri and  Illinois.  With $1.8 billion in assets
and 2001 revenues of $815 million,  CILCORP's largest subsidiary,  CILCO, serves
200,000 electric and more than 200,000 natural gas customers.

Safe Harbor Statement
---------------------

     This news release may include forward-looking statements. Actual events and
results may differ  materially from those  projected.  Factors that could affect
actual  results  are  discussed  in Ameren's  filings  with the  Securities  and
Exchange  Commission,  and readers are encouraged to read those filings to learn
more about the risk factors associated with Ameren's businesses.

                                      # # #