SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549



In the Matter of:

AMEREN CORPORATION                                QUARTERLY CERTIFICATE
AMEREN SERVICES COMPANY                           PURSUANT TO RULE 24 UNDER THE
UNION ELECTRIC COMPANY                            PUBLIC UTILITY HOLDING COMPANY
CENTRAL ILLINOIS PUBLIC SERVICE                   ACT OF 1935
  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 September 30,
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.

          During the 3rd quarter of 2002, Ameren Corporation issued an aggregate
          of  8,050,000  shares  (7,000,000  base  shares and  1,050,000  shares
          pursuant to the exercise of an option granted to the  underwriters) of
          Common Stock at $42.00 per share. The offering closed on September 10,
          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:       393,111
          Long Term Savings Plan 148:                           18,579
          Long Term Savings Plan 702:                           17,526
          Savings Investment Plan                              253,309
          Long Term Incentive Plan (Restricted Common Stock)         0

          Total                                                682,525

     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 3rd 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 3rd quarter of
               2002.

          B.   There were no bank loans for the 3rd 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     09/19/02-12/31/03     Credit Support
          Ameren Corp.    Ameren Energy Fuels & Services Co.    $ 5,000,000     07/08/02-12/31/03     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 3rd quarter of 2002.

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

          Incorporated  by reference  to  Quarterly  Report on Form 10-Q for the
          quarterly period ended September 30, 2002 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.

          To be filed confidentially under Rule 104.


     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.



     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

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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 - $113.4 million
     Maximum contribution/investment for Union Electric - $25.5
     Maximum contribution/investment for Ameren Corporation - $302.9 million

     Maximum borrowing for Ameren Services - $130.2 million
     Maximum borrowing for Union Electric - $254.7 million

     Average interest rate for the Utility Money Pool for the quarter: 1.7%

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.

          There was no Short-term  Debt issued by Union  Electric or CIPS (other
          than through the Utility Money Pool) during the calendar quarter.

     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 3rd 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: September 30, 2002
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              Jerre E. Birdsong
              Vice President and Treasurer




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