SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549


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In the Matter of:

AMEREN CORPORATION                     QUARTERLY CERTIFICATE PURSUANT TO RULE 24
AMEREN SERVICES COMPANY                UNDER THE PUBLIC UTILITY HOLDING COMPANY
UNION ELECTRIC COMPANY                 ACT OF 1935
CENTRAL ILLINOIS PUBLIC SERVICE
COMPANY

File Nos.  70-9877, 70-9427, 70-9423 and 70-9133


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     Ameren  Corporation  ("Ameren"),  a  registered  holding  company,  and its
subsidiaries  named  above,  hereby  file this  certificate  pursuant to Rule 24
reporting on  transactions  authorized by the Commission by orders dated October
5, 2001  (Holding  Co. Act Release No.  27449),  July 23, 1999  (Holding Co. Act
Release No.  27053),  March 22, 1999  (Holding Co. Act Release No.  26993),  and
March 13, 1998 (Holding Co. Act Release No.  26841).  This  certificate is filed
with respect to transactions  consummated  during the quarter ended December 31,
2002.

A.   File No. 70-9877:
     ----------------

     1.   Sales of any Common Stock  (other than  pursuant to the Plans) and the
          purchase price per share and the market price per share at the date of
          the agreement of sale.

          No common stock was issued during the 4th quarter of 2002.

     2.   The total number of shares of Common  Stock  issued or issuable  under
          options,  warrants or other  stock-purchase  rights granted during the
          quarter under the Plans.

          Dividend Reinvestment and Stock Purchase Plan:              385,410
          Long Term Savings Plan 148:                                   3,556
          Long Term Savings Plan 702:                                   1,896
          Savings Investment Plan:                                    171,610
          Long Term Incentive Plan (Restricted Common Stock)                0
                                                                   ----------

          Total                                                       562,472

     3.   If Common Stock has been  transferred  to a seller of  securities of a
          company being acquired,  the number of shares so issued, the value per
          share and whether the shares are restricted to the acquiror.

          N/A


     4.   The amount and terms of any Long-term  Debt,  Preferred Stock or other
          preferred or equity-linked  securities  issued by Ameren,  directly or
          indirectly  through  a  Financing  Subsidiary,   during  the  calendar
          quarter.

          No such securities were issued during the 4th quarter of 2002.




     5.   The  amount  and  terms of any  Short-term  Debt  issued  directly  or
          indirectly by Ameren during the calendar quarter.

          A.   There was no  commercial  paper issued  during the 4th quarter of
               2002.

          B.   There were no bank loans for the 4th quarter of 2002.

          Maximum indebtedness at any one time:  $0.00.

     6.   A description of the amount, terms and purpose of any Guarantee issued
          during the calendar  quarter by Ameren and the name of the beneficiary
          of such Guarantee.




            Parent            Subsidiary                         Amount          Terms             Purpose
            ------            ----------                         ------          -----             -------
                                                                                   
          Ameren Corp.   Ameren Energy Marketing             $  3,000,000   12/23/02-12/31/03   Credit Support
          Ameren Corp.   Ameren Energy Marketing             $  3,000,000   12/03/02     ---    Credit Support
          Ameren Corp.   Ameren Energy, Inc.                 $  3,000,000   12/12/02-12/31/04   Credit Support
          Ameren Corp.   Ameren Energy Marketing             $  3,000,000   12/12/02-12/31/04   Credit Support
          Ameren Corp.   Ameren Energy Fuels & Services Co.  $  5,000,000   10/09/02     ---    Credit Support
          Ameren Corp.   Ameren Energy Fuels & Services Co.  $  5,000,000   12/23/02-12/31/03   Credit Support


     7.   The name and amount  invested  by Ameren in any  Financing  Subsidiary
          during the calendar quarter.

          N/A

     8.   The notional  amount and principal terms of any Interest Rate Hedge or
          Anticipatory Hedge entered into during the quarter and the identity of
          the parties to such instruments.

          No such agreements were entered into during the 4th quarter of 2002.

     9.   Consolidated  balance  sheet of Ameren  as of the end of the  calendar
          quarter.

          Incorporated  by  reference  to  Annual  Report  on Form  10-K for the
          fiscal year ended December 31, 2002 to be filed in File No. 1-14756.

B.   File No. 70-9427:
     ----------------

     1.   Balance Sheet and Income  Statement for each  Intermediate  Subsidiary
          for the three, six or nine month period ended.

          No financial statements are required for the fourth quarter filing.


     2.   Information  concerning the nature and extent of services  provided by
          Ameren  Development,  Ameren  Energy,  CIC  or any  other  non-utility
          subsidiary that is authorized or permitted under the Act to sell goods
          and services during the quarter,  identifying the associate company to
          which such services are sold, the service and the charge,  and stating
          whether the charge was computed at cost,  market or by another  method
          (as specified herein).

          To be filed confidentially under Rule 104.


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     3.   Information   concerning  the  completion  of  any  reorganization  of
          Ameren's  ownership in  Intermediate  Subsidiaries  and/or  Nonutility
          Subsidiaries,  including  the identity of the  companies  involved and
          their line of business and corporate  structure  both before and after
          the reorganization.

          N/A


C.   File No. 70-9423:
     ----------------

     The maximum  outstanding  amount of all borrowings  under or investments in
     the Utility  Money Pool by each Utility Money Pool  participant  during the
     quarter,  and the rate or range of rates  charged  on  Utility  Money  Pool
     borrowings and paid on Utility Money Pool investments during the quarter.

     Maximum contribution/investment for CIPS - $92.1 million
     Maximum contribution/investment for Union Electric - $0.0 million
     Maximum contribution/investment for Ameren Corporation - $176.3 million

     Maximum borrowing for Ameren Services - $122.9 million
     Maximum borrowing for Union Electric - $117.4 million

     Average  interest  rate for the  Utility  Money Pool for the 4th quarter of
     2002: 1.5%

D.   File No. 70-9133:
     ----------------

     1.   The amount and terms of any  Short-term  Debt issued by Union Electric
          or CIPS  (other  than  through  the  Utility  Money  Pool)  during the
          calendar quarter.

          Union Electric issued commercial paper through A. G. Edwards,  Goldman
          Sachs,  and/or Bank One Capital  Markets,  ranging from $0.0 to $250.0
          million, at an average rate of 1.4%.

          There were no bank loans for the 4th quarter of 2002.

          Maximum  indebtedness at any one time: $250.0 million from 12/19/02 to
          12/31/02.

     2.   The notional  amount and  principal  terms of any Interest  Rate Hedge
          entered  into  during the  quarter by Union  Electric  or CIPS and the
          identity of the parties to such instruments.

          No such agreements were entered into during the 4th quarter of 2002.

The undersigned registered holding company has duly caused this quarterly report
to be signed on its behalf by the undersigned  officer thereunto duly authorized
pursuant to the requirements of the Public Utility Holding Company Act of 1935.

Ameren Corporation



By     /s/ Jerre E. Birdsong
  ----------------------------------------               Date: February 28, 2003
           Jerre E. Birdsong
           Vice President and Treasurer


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