(As filed on November 20, 2002)

                                                              File No. 70-[____]


                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM U-1

                           APPLICATION OR DECLARATION
                                    UNDER THE
                   PUBLIC UTILITY HOLDING COMPANY ACT OF 1935

                               AMEREN CORPORATION
                             UNION ELECTRIC COMPANY
                             AMEREN SERVICES COMPANY
                               AMEREN ENERGY, INC.
                           AMEREN DEVELOPMENT COMPANY
                                AMEREN ERC, INC.
                       AMEREN ENERGY COMMUNICATIONS, INC.
                         AMEREN ENERGY RESOURCES COMPANY
                        AMEREN ENERGY DEVELOPMENT COMPANY
                        AMEREN ENERGY GENERATING COMPANY
                         AMEREN ENERGY MARKETING COMPANY
                    AMEREN ENERGY FUELS AND SERVICES COMPANY
                          ILLINOIS MATERIALS SUPPLY CO.
                     UNION ELECTRIC DEVELOPMENT CORPORATION
                          AFS DEVELOPMENT COMPANY, LLC
                              1901 Chouteau Avenue
                            St. Louis, Missouri 63103

                     CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
                            CIPSCO INVESTMENT COMPANY
                              607 East Adams Street
                           Springfield, Illinois 62739





                                  CILCORP INC.
                         CENTRAL ILLINOIS LIGHT COMPANY
                        CENTRAL ILLINOIS GENERATION, INC.
                       CILCORP INVESTMENT MANAGEMENT INC.
                              CILCORP VENTURES INC.
                          CILCORP ENERGY SERVICES INC.
                              QST ENTERPRISES INC.
                    CILCO EXPLORATION AND DEVELOPMENT COMPANY
                            CILCO ENERGY CORPORATION
                               300 Liberty Street
                             Peoria, Illinois 61602

                     AES MEDINA VALLEY COGEN (NO. 4), L.L.C.
                     AES MEDINA VALLEY COGEN (NO. 2), L.L.C.
                         AES MEDINA VALLEY COGEN, L.L.C.
                      AES MEDINA VALLEY OPERATIONS, L.L.C.
                                  P.O. Box 230
                         Mossville, Illinois 61552-0230

                    (Names of companies filing this statement
                  and addresses of principal executive offices)

              -----------------------------------------------------

                               AMEREN CORPORATION

 (Name of top registered holding company parent of each applicant or declarant)

              -----------------------------------------------------

              Steven R. Sullivan, Vice President Regulatory Policy,
                          General Counsel and Secretary
                             Ameren Services Company
                              1901 Chouteau Avenue
                            St. Louis, Missouri 63103

                     (Name and address of agent for service)

              -----------------------------------------------------

           The Commission is requested to mail copies of all orders,
                      notices and other communications to:

Ronald K. Evans,                                William T. Baker, Jr., Esq.
Managing Associate General Counsel              Thelen Reid & Priest LLP
Ameren Services Company                         40 West 57th Street
1901 Chouteau Avenue                            New York, New York  10019
St. Louis, Missouri 63103


                                       2



ITEM 1. DESCRIPTION OF PROPOSED TRANSACTION.
        -----------------------------------

     1.1 Introduction. Ameren Corporation ("Ameren"), whose principal business
address is at 1901 Chouteau Avenue, St. Louis, Missouri 63103, is a registered
holding company under the Public Utility Holding Company Act of 1935, as amended
(the "Act"). Ameren owns all of the issued and outstanding common stock of Union
Electric Company d/b/a AmerenUE ("AmerenUE") and Central Illinois Public Service
Company d/b/a AmerenCIPS ("AmerenCIPS"), each of which is an electric and gas
utility company. Together, AmerenUE and AmerenCIPS provide retail and wholesale
electric service to approximately 1.5 million customers and retail natural gas
service to approximately 300,000 customers in a 24,500 square-mile area of
Missouri and Illinois.

     Ameren has five direct wholly-owned non-utility subsidiaries, as follows:

o    Ameren Services Company ("Ameren Services"), a service company subsidiary,
     which provides administrative, management and technical services to Ameren
     and its associate companies in the Ameren system;

o    Ameren Development Company ("Ameren Development"), an intermediate
     non-utility holding company, which directly and indirectly owns all of the
     outstanding stock of two "energy-related companies" under Rule 58 (Ameren
     ERC, Inc. ("Ameren ERC"), which provides energy management services, and
     Missouri Central Railroad, a fuel transportation subsidiary) and Ameren
     Energy Communications, Inc. ("Ameren Communications"), an "exempt
     telecommunications company" under Section 34 of the Act;

o    Ameren Energy Resources Company ("Ameren Energy Resources"), also an
     intermediate non-utility holding company, which directly holds all of the
     outstanding common stock of Ameren Energy Development Company ("Ameren
     Energy Development"), an "exempt wholesale generator" ("EWG") under Section
     32 of the Act; two "energy-related companies" under Rule 58 (Ameren Energy
     Marketing Company ("Ameren Energy Marketing"), a power marketer, and Ameren
     Energy Fuels and Services Company ("Ameren Fuels"), which brokers and
     markets energy commodities and owns and manages fuel procurement and
     delivery assets); and Illinois Materials Supply Co. ("Illinois Materials"),
     which was established to serve as an "enterprise zone" company in
     connection with purchasing goods, material and equipment for Ameren Energy
     Development and other non-utility associate companies. Ameren Energy
     Development, in turn, owns all of the outstanding common stock of Ameren
     Energy Generating Company ("Ameren GenCo"), an EWG,(1) and Ameren Fuels
     owns all of the membership interests of AFS Development Company, L.L.C.
     ("AFS Development"), an "energy-related company" organized to make

----------
(1)  Ameren GenCo was organized in order to facilitate the restructuring of
AmerenCIPS in accordance with the Illinois Electric Service Customer Choice and
Rate Relief Law of 1997 ("Customer Choice Law"). In May 2000, Ameren GenCo
acquired all of the existing generating assets of AmerenCIPS.


                                       3



     investments in and engage in operating activities related to oil and gas,
     coal bed methane, and other energy commodities.(2)

o    Ameren Energy, Inc. ("Ameren Energy"), an "energy-related company" under
     Rule 58 that primarily serves as the short-term energy trading and
     marketing agent for AmerenUE and Ameren GenCo and provides a range of
     energy and risk management services; and

o    CIPSCO Investment Company ("CIC"), which holds various nonregulated and
     passive investments, including passive investments in affordable housing
     projects that qualify for federal tax credits and investments in equipment
     leases.

     In addition to the foregoing, AmerenUE has one direct wholly-owned
non-utility subsidiary, Union Electric Development Company ("UEDC"), which holds
investments in steam delivery systems, affordable housing projects that qualify
for federal income tax credits, and other passive investments.(3)

     For the year ended December 31, 2001, Ameren reported total operating
revenues of $4,505,867,000, of which approximately 92.2% were derived from
electric operations, 7.64% from gas operations, and .2% from other operations.
At December 31, 2001, Ameren had total assets of $10,400,575,000, including net
property and plant of $7,765,611,000.

     As of September 30, 2002, Ameren's capitalization on a consolidated basis
and the capitalization of AmerenUE and AmerenCIPS were as follows:



--------------------------------------------------------------------------------
                               Ameren          AmerenUE          AmerenCIPS
--------------------------------------------------------------------------------
                                                           
Common equity                   50.7%            58.4%              45.4%
--------------------------------------------------------------------------------
Preferred stock equity           2.4%             2.4%               6.6%
--------------------------------------------------------------------------------
Long-term debt                  43.6%            32.9%              44.2%
--------------------------------------------------------------------------------
Short-term debt*                 3.3%             6.4%               3.7%
--------------------------------------------------------------------------------

          * including current portion of long-term debt.



     Ameren's senior unsecured debt securities are currently rated A by Standard
& Poor's Inc. ("S&P") and A2 by Moody's Investors Service ("Moody's"). The first
mortgage bonds of AmerenUE and AmerenCIPS are currently rated A+ and A+,
respectively, by S&P and Aa3 and A1, respectively, by Moody's.

     In a separate proceeding (File No. 70-10078),(4) Ameren is seeking
authorization under Sections 9(a)(1) and 10 of the Act to acquire from The AES
Corporation ("AES") all of the issued and outstanding common stock of CILCORP

----------
(2)  Ameren Energy Resources also directly holds 20% of the outstanding common
stock of Electric Energy, Inc., an EWG.
(3)  AmerenUE also directly holds 40% of the outstanding common stock of
Electric Energy, Inc., an EWG.
(4)  See Holding Co. Act Release No. 27586 (Oct. 25, 2002) (notice of filing).


                                       4



Inc. ("CILCORP"), an exempt holding company. CILCORP directly owns all of the
issued and outstanding common stock of Central Illinois Light Company ("CILCO"),
an electric and gas utility company that operates in parts of central Illinois.
CILCO, in turn, owns all of the issued and outstanding common stock of Central
Illinois Generation, Inc. ("CIGI"), an EWG. CIGI was formed by CILCO in November
2001 in order to facilitate the restructuring of CILCO in accordance with the
Customer Choice Law. As explained in File No. 70-10078, CILCO intends to
transfer substantially all of its generating assets to CIGI prior to or
following completion of Ameren's acquisition of CILCORP. Also following the
acquisition of CILCORP, Ameren will cause CIGI to relinquish EWG status. Thus,
Ameren is treating CIGI as an "electric utility company" under the Act both for
purposes of File No. 70-10078 and this proceeding.

     In addition, CILCORP directly owns all of the common stock of three
non-utility subsidiaries, as follows:

o    CILCORP Investment Management Inc. ("CIM"), which, through subsidiaries,
     manages CILCORP's investments in equipment leases, affordable housing
     projects that qualify for federal income tax credits, non-regulated
     independent power projects, and other passive investments;

o    CILCORP Ventures Inc. ("CVI"), which, through a wholly-owned subsidiary,
     CILCORP Energy Services, Inc. ("CESI"), provides energy-related products
     and services, including gas management services for gas management
     customers; and

o    QST Enterprises Inc. ("QST"), which, through subsidiaries, provides energy
     and related services in non-regulated retail and wholesale markets,
     including utility operations and maintenance services (primarily to one of
     CILCO's largest industrial customers), and holds interests in
     environmentally distressed parcels of real estate acquired for resale.

     In addition to CIGI, CILCO directly owns all of the issued and outstanding
common stock of two non-utility subsidiaries: CILCO Exploration and Development
Company ("CILCO Exploration"), which engages in the exploration and development
of gas, oil, coal and other mineral resources; and CILCO Energy Corporation
("CILCO Energy"), which was formed to research and develop new sources of
energy, including the conversion of coal and other minerals into gas. Neither
company conducts any significant business at this time.

     In conjunction with the acquisition of CILCORP, Ameren has also agreed to
acquire from AES all of the membership interests in AES Medina Valley Cogen (No.
4), L.L.C. ("AES Medina Valley"), an intermediate non-utility holding company
that indirectly through AES Medina Valley Cogen (No. 2), L.L.C. holds all of the
membership interests in AES Medina Valley Cogen, L.L.C. ("AES Medina Valley
Cogen"), an EWG. AES Medina Valley Cogen owns a 40 MW gas-fired cogeneration
facility in Mossville, Illinois that produces electricity, steam and chilled
water for sale to CILCO. AES Medina Valley also owns all of the membership
interests in AES Medina Valley Operations, L.L.C., which operates the Mossville
facility.


                                       5



     Subject to receiving all necessary regulatory approvals, it is expected
that Ameren will complete its acquisition of CILCORP (as well as of AES Medina
Valley) by the end of 2002 or early in 2003, at which time CILCORP and its
direct and indirect subsidiary companies will become subsidiary companies of
Ameren. Accordingly, CILCORP, CILCO, CIGI and the direct and indirect
non-utility subsidiaries of CILCORP and AES named above have been added as
Applicants in this proceeding.

     Ameren, CILCORP and AES Medina Valley, and their respective direct and
indirect utility and non-utility subsidiaries named on the front cover of this
Application/Declaration and described above are herein referred to collectively
as the "Applicants."

     1.2  AmerenUE's and AmerenCIPS' Current Financing Authorization.
          ----------------------------------------------------------

          (a) External Short-term Debt and Interest Rate Hedging Transactions.
By order dated March 13, 1998 in File No. 70-9133 (the "1998 Financing
Order"),(5) AmerenUE and AmerenCIPS are currently authorized for the period
through February 27, 2003 to issue and sell commercial paper and to establish
credit lines and issue notes thereunder evidencing unsecured short-term
borrowings ("Short-term Debt"). AmerenUE is authorized to issue up to $575
million of commercial paper at any one time outstanding and borrow up to $425
million under credit lines. AmerenCIPS is authorized to issue up to $125 million
of commercial paper at any one time outstanding and borrow up to $125 million
under credit lines. Under the 1998 Financing Order, the effective cost of money
on all Short-term Debt may not exceed 300 basis points over the six-month London
Interbank Offered Rate ("LIBOR"). Issuance expenses in connection with any
non-competitive offering of Short-term Debt may not exceed 5% of the principal
amount thereof.

     At September 30, 2002, AmerenUE had committed bank lines totaling $85.5
million, all of which were unused and available. These lines are renewable
annually at various dates throughout the year and are available to support
AmerenUE's commercial paper program. The availability under these facilities at
any point in time is reduced by the amount of commercial paper outstanding. At
September 30, 2002, AmerenCIPS did not have outstanding any external short-term
borrowings. AmerenCIPS had committed bank lines aggregating $15 million, all of
which were unused and available.

     Under the 1998 Financing Order, AmerenUE and AmerenCIPS were also
authorized to enter into interest rate hedging instruments with respect to
outstanding indebtedness of such companies.

----------
(5)  See Ameren Corporation, et al., Holding Co. Act Release No. 26841 (Mar. 13,
1998). The 1998 Financing Order, solely as it relates to financing activities of
Ameren, was amended by order dated April 26, 1999 (Holding Co. Act Release No.
27011), and subsequently superseded and replaced by order dated October 5, 2001
in File No. 70-9877. See Ameren Corporation, Holding Co. Act Release No. 27449
(Oct. 5, 2001) (the "2001 Ameren Financing Order").


                                       6



          (b) Utility Money Pool. By order dated March 22, 1999 in File No.
70-9423 (the "Money Pool Order"),(6) Ameren was authorized to establish and fund
loans to AmerenUE, AmerenCIPS and Ameren Services through the Ameren Corporation
System Utility Money Pool Agreement (the "Utility Money Pool") in order to
provide for the short-term cash and working capital needs of these companies.(7)
Further, to the extent not exempt under Rule 52, AmerenUE, AmerenCIPS, and
Ameren Services are authorized to make borrowings from and extend credit to each
other pursuant to the Utility Money Pool. Ameren may not make borrowings under
the Utility Money Pool. AmerenUE is authorized to borrow up to $500 million at
any one time outstanding under the Utility Money Pool.(8) If surplus funds made
available by the participants in the Utility Money Pool are used to fund loans
to AmerenUE, AmerenCIPS or Ameren Services, the interest rate applicable to such
loans is equal to the CD yield equivalent of the 30-day Federal Reserve "AA"
Non-Financial commercial paper composite rate. If proceeds from external
borrowings by any participant in the Utility Money Pool are used to fund loans,
the interest rate is equal to the lending company's cost of borrowing. In cases
where both surplus funds and external borrowings are used to fund loans to
AmerenUE, AmerenCIPS or Ameren Services, the applicable interest rate is a
blended rate. For the year ended December 31, 2001, the average interest rate on
borrowings under the Utility Money Pool was 3.95%. Ameren Services is the
administrator of the Utility Money Pool. The authorization period under the
Money Pool Order is also through February 27, 2003.

     Ameren also maintains and funds loans to certain of its non-utility
subsidiaries pursuant to the Ameren Corporation System Amended and Restated
Non-Utility Money Pool Agreement (the "Non-Utility Money Pool") in order to
provide for the short-term cash and working capital requirements of these
subsidiaries. In addition to Ameren, which is not permitted to be a borrower
under the Non-Utility Money Pool, the current participants in the Non-Utility
Money Pool are Ameren Services, which also acts as the administrator of the
Non-Utility Money Pool, Ameren Development, Ameren Energy, Ameren ERC, Ameren
Energy Communications, Ameren Energy Resources, Ameren Energy Development,
Ameren GenCo, Ameren Energy Marketing, Ameren Fuels, CIC, Illinois Materials,
and UEDC. Ameren Services participates in the Non-Utility Money Pool as a
borrower only and not as a lender.(9) Borrowings and extensions of credit by
Ameren's non-utility subsidiaries under the Non-Utility Money Pool are exempt
pursuant to Rule 52(b) and (d) and Rule 45(b)(1), as applicable.

     1.3 Overview of Proposed Transactions. The Applicants are requesting
authorization herein for the period through March 31, 2006 (the "Authorization
Period") (1) to extend and restate the external short-term financing and
interest rate hedging authorization of AmerenUE and AmerenCIPS under the 1998

----------
(6)  See Ameren Corporation, et al., Holding Co. Act Release No. 26993 (Mar. 22,
1999).
(7)  Funds advanced by Ameren to the Utility Money Pool are derived from
commercial paper sales and other short-term borrowings by Ameren authorized
under the 2001 Ameren Financing Order, as well as surplus funds in the treasury
of Ameren.
(8)  Borrowings by AmerenCIPS under the Utility Money Pool have been approved by
the Illinois Commerce Commission ("ICC") and are therefore exempt under Rule
52(a). Borrowings by Ameren Services are exempt under Rule 52(b).
(9)  Any surplus funds that Ameren Services has on hand are only invested in the
Utility Money Pool.


                                       7



Financing Order, (2) to extend and continue the Utility Money Pool and
Non-Utility Money Pool (to be re-designated as the "Non-Regulated Subsidiary
Money Pool") arrangements,(10) and (3) following Ameren's acquisition of
CILCORP, to add CILCO as a participant in the Utility Money Pool and CILCORP,
CIGI, certain non-utility subsidiaries of CILCORP (as identified below), and AES
Medina Valley and its direct and indirect non-utility subsidiaries as
participants in the Non-Regulated Subsidiary Money Pool, in each case subject to
all of the existing terms, conditions and limitations of the money pool
agreements. Ameren is not requesting any new financing authority in this
proceeding.

     1.4 Short-term Debt. AmerenUE and AmerenCIPS propose to issue and sell from
time to time during the Authorization Period Short-term Debt in an aggregate
principal amount at any time outstanding not to exceed, when added to any
borrowings by such companies under the Utility Money Pool, $1 billion in the
case of AmerenUE and $250 million in the case of AmerenCIPS. Short-term Debt may
include commercial paper notes, bank notes, and other forms of short-term
indebtedness. All Short-term Debt will have maturities of less than one year
from the date of issuance.

     Commercial paper will be sold in established domestic or European
commercial paper markets. Such commercial paper would typically be sold to
dealers at the discount rate per annum prevailing at the date of issuance for
commercial paper of comparable quality and maturities sold to commercial paper
dealers generally. It is expected that the dealers acquiring such commercial
paper will reoffer it at a discount to corporate, institutional and, with
respect to European commercial paper, individual investors. It is anticipated
that such commercial paper will be reoffered to investors such as commercial
banks, insurance companies, pension funds, investment trusts, foundations,
colleges and universities, finance companies and nonfinancial corporations.

     AmerenUE and AmerenCIPS also propose to establish and maintain back-up
credit facilities and other credit facilities with banks or other financial
institutions to support their commercial paper program(s) and other credit
and/or borrowing facilities generally available to borrowers with comparable
credit ratings as they may deem appropriate in light of their needs and existing
market conditions providing for revolving credit or other loans and having
commitment periods not longer than the Authorization Period. Only the amounts
drawn and outstanding under these agreements and facilities will be counted
against the proposed limits on Short-term Debt.

     The effective cost of money on all Short-term Debt will not exceed at the
time of issuance the greater of (i) 300 basis points over six-month LIBOR, or
(ii) a gross spread over six-month LIBOR that is consistent with similar
securities of comparable credit quality and maturities issued by other
companies. Issuance expenses in connection with any non-competitive offering of
Short-term Debt will not exceed 5% of the principal amount thereof.

----------
(10) CILCORP, CILCO and CIGI are seeking authorization to issue short-term and
long-term securities and to engage in interest rate hedging transactions through
March 31, 2006 as part of the pending application in File No. 70-10078.


                                       8



     1.5  Hedging Transactions.
          --------------------

          (a) Interest Rate Hedges. AmerenUE and AmerenCIPS also request
authorization to enter into interest rate hedging transactions with respect to
outstanding indebtedness ("Interest Rate Hedges"), subject to certain
limitations and restrictions, in order to reduce or manage the effective
interest rate cost. Interest Rate Hedges would only be entered into with
counterparties ("Approved Counterparties") whose senior debt ratings, or the
senior debt ratings of any credit support providers who have guaranteed the
obligations of such counterparties, as published by S&P, are equal to or greater
than BBB, or an equivalent rating from Moody's or Fitch.

     Interest Rate Hedges will involve the use of financial instruments commonly
used in today's capital markets, such as interest rate swaps, caps, collars,
floors, and structured notes (i.e., a debt instrument in which the principal
and/or interest payments are indirectly linked to the value of an underlying
asset or index), or transactions involving the purchase or sale, including short
sales, of U.S. Treasury Securities. The transactions would be for fixed periods
and stated notional amounts. Fees, commissions and other amounts payable to the
counterparty or exchange (excluding, however, the swap or option payments) in
connection with an Interest Rate Hedge will not exceed those generally
obtainable in competitive markets for parties of comparable credit quality.

          (b) Anticipatory Hedges. In addition, AmerenUE and AmerenCIPS request
authorization to enter into interest rate hedging transactions with respect to
anticipated debt offerings (the "Anticipatory Hedges"), subject to certain
limitations and restrictions. Such Anticipatory Hedges would only be entered
into with Approved Counterparties, and would be utilized to fix the interest
rate and/or limit the interest rate risk associated with any new issuance
through (i) a forward sale of exchange-traded U.S. Treasury futures contracts,
U.S. Treasury Securities and/or a forward swap (each a "Forward Sale"), (ii) the
purchase of put options on U.S. Treasury Securities (a "Put Options Purchase"),
(iii) a Put Options Purchase in combination with the sale of call options on
U.S. Treasury Securities (a "Zero Cost Collar"), (iv) transactions involving the
purchase or sale, including short sales, of U.S. Treasury Securities, or (v)
some combination of a Forward Sale, Put Options Purchase, Zero Cost Collar
and/or other derivative or cash transactions, including, but not limited to
structured notes, caps and collars, appropriate for the Anticipatory Hedges.

     Anticipatory Hedges may be executed on-exchange ("On-Exchange Trades") with
brokers through the opening of futures and/or options positions traded on the
Chicago Board of Trade, Chicago Mercantile Exchange or other financial exchange,
the opening of over-the-counter positions with one or more counterparties
("Off-Exchange Trades"), or a combination of On-Exchange Trades and Off-Exchange
Trades. AmerenUE and AmerenCIPS will determine the optimal structure of each
Anticipatory Hedge transaction at the time of execution.

     Each Interest Rate Hedge and Anticipatory Hedge will qualify for hedge
accounting treatment under the current Financial Accounting Standards Board
("FASB") guidelines in effect and as determined at the time entered into.
Further, the applicants will comply with the Statement of Financial Accounting
Standards ("SFAS") 133 ("Accounting for Derivatives Instruments and Hedging
Activities") and SFAS 138 ("Accounting for Certain Derivative Instruments and


                                       9



Certain Hedging Activities") or other standards relating to accounting for
derivative transactions as are adopted and implemented by the FASB.(11)

     1.6 Utility Money Pool. Ameren, AmerenUE, AmerenCIPS, and Ameren Services
seek authorization to continue their participation in the Utility Money Pool,
subject to all of the terms, conditions and limitations set forth in the Money
Pool Order. AmerenUE requests authority to borrow up to $500 million at any time
outstanding under the Utility Money Pool. Ameren will continue to participate in
the Utility Money Pool as a lender only and may not make any borrowings from or
receive any extension of credit through the Utility Money Pool. In addition,
CILCO proposes to become a participant in the Utility Money Pool upon becoming a
subsidiary of Ameren, subject to receiving approval from the ICC.(12)

     Ameren will continue to fund loans to Utility Money Pool participants with
the proceeds of commercial paper sales and other short-term borrowings by Ameren
authorized under the 2001 Ameren Financing Order, as well as surplus funds in
the treasury of Ameren. Ameren is not requesting any new financing authority in
this proceeding.

     In accordance with the terms and provisions of the Utility Money Pool,
funds will be available from the following sources for short-term loans to
AmerenUE, AmerenCIPS, CILCO and Ameren Services, from time to time: (1) surplus
funds in the treasuries of AmerenUE, AmerenCIPS, CILCO and Ameren Services, (2)
surplus funds in the treasury of Ameren, and (3) proceeds from bank borrowings
and the sale of commercial paper by Ameren, AmerenUE, AmerenCIPS, CILCO and
Ameren Services ("External Funds"). Funds will be made available from such
sources in such other order as Ameren Services, as administrator of the Utility
Money Pool, may determine would result in a lower cost of borrowing, consistent
with the individual borrowing needs and financial standing of the companies
providing funds to the Utility Money Pool. The determination of whether a
Utility Money Pool participant at any time has surplus funds to lend to the
Utility Money Pool, or shall lend such funds to the Utility Money Pool, will be
made by such participant's Treasurer, or by a designee thereof, on the basis of
cash flow projections and other relevant factors, in such participant's sole
discretion.

     Utility Money Pool participants that borrow will borrow pro rata from each
company that lends, in the proportion that the total amount loaned by each such
lending company bears to the total amount then loaned through the Utility Money
Pool. On any day when more than one fund source (e.g., surplus treasury funds of
Ameren and other Utility Money Pool participants ("Internal Funds") and External
Funds), with different rates of interest, is used to fund loans through the
Utility Money Pool, each borrower will borrow pro rata from each such fund

----------
(11) The authority sought for interest rate hedging transactions in this
Application/Declaration is identical to the authorization previously granted to
Ameren under the 2001 Ameren Financing Order.
(12) Utility Money Pool borrowings by AmerenCIPS will continue to be exempt
under Rule 52(a) because such borrowings have been approved by the ICC.
Likewise, borrowings by CILCO will be exempt under Rule 52(a) upon receipt of
approval by the ICC. Borrowings by Ameren Services under the Utility Money Pool
will be exempt under Rule 52(b).


                                       10



source in the Utility Money Pool in the same proportion that the amount of funds
provided by that fund source bears to the total amount of short-term funds
available to the Utility Money Pool.

     Certain additional terms of the Utility Money Pool are described below:

          Interest Rate on Loans. If only Internal Funds comprise the funds
available in the Utility Money Pool, the interest rate applicable to loans of
such Internal Funds will be the CD yield equivalent of the 30-day Federal
Reserve "AA" Non-Financial commercial paper composite rate (or if no such rate
is established for that day, then the applicable rate would be the rate for the
next preceding day for which such rate was established).

          If only External Funds comprise the funds available in the Utility
Money Pool, the interest rate applicable to loans of such External Funds will be
equal to the lending company's cost for such External Funds (or, if more than
one Utility Money Pool participant had made available External Funds on such
day, the applicable interest rate will be a composite rate equal to the weighted
average of the cost incurred by the respective Utility Money Pool participants
for such External Funds).

          In cases where both Internal Funds and External Funds are concurrently
borrowed through the Utility Money Pool, the rate applicable to all loans
comprised of such "blended" funds will be a composite rate equal to the weighted
average of (a) the cost of all Internal Funds contributed by Utility Money Pool
participants (as determined pursuant to the second preceding paragraph above)
and (b) the cost of all such External Funds (as determined pursuant to the
immediately preceding paragraph above). In circumstances where Internal Funds
and External Funds are available for loans through the Utility Money Pool, loans
may be made exclusively from Internal Funds or External Funds, rather than from
a "blend" of such funds, to the extent it is expected that such loans would
result in a lower cost of borrowing.

          Certain Costs. The cost of compensating balances and/or fees paid to
banks to maintain credit lines by Utility Money Pool participants lending
External Funds to the Utility Money Pool will initially be paid by the
participant maintaining such line. Commitment fees will be allocated by usage of
proceeds. A portion of such costs, or all of such costs in the event a Utility
Money Pool participant establishes a line of credit solely for purposes of
lending any External Funds obtained thereby into the Utility Money Pool, will be
retroactively allocated every month to the companies borrowing such External
Funds through the Utility Money Pool in proportion to their respective daily
outstanding borrowings of such External Funds.

          Investment of Surplus Funds. Funds not required by the Utility Money
Pool to make loans (with the exception of funds required to satisfy the Utility
Money Pool's liquidity requirements) will ordinarily be invested in one or more
short-term investments, including: (i) interest-bearing accounts with banks;
(ii) obligations issued or guaranteed by the U.S. government and/or its agencies
and instrumentalities, including obligations under repurchase agreements; (iii)
obligations issued or guaranteed by any state or political subdivision thereof,
provided that such obligations are rated not less than A by a nationally
recognized rating agency; (iv) commercial paper rated not less than A-1 or P-1
or their equivalent by a nationally recognized rating agency; (v) money market
funds; (vi) bank certificates of deposit and bankers acceptances; (vii)
Eurodollar certificates of deposit or time deposits; (viii) investment grade


                                       11



medium term notes, variable rate demand notes and variable rate preferred stock;
and (ix) such other investments as are permitted by Section 9(c) of the Act and
Rule 40 thereunder.

          Allocation of Interest Income and Investment Earnings. The interest
income and investment income earned on loans and investments of surplus funds
will be allocated among the participants in the Utility Money Pool in accordance
with the proportion each participant's contribution of funds bears to the total
amount of funds in the Utility Money Pool and the cost of funds provided to the
Utility Money Pool by such participant.

          Repayment. Each applicant receiving a loan through the Utility Money
Pool will be required to repay the principal amount of such loan, together with
all interest accrued thereon, on demand or on a date agreed by the parties to
the transaction, but in any event within one year of the date on which such loan
was made. All loans made through the Utility Money Pool may be prepaid by the
borrower without premium or penalty. Interest will be accrued by each borrower
monthly.

          Form of Loans to Applicants. Under the authorization requested herein,
all loans through the Utility Money Pool will be made on or before March 31,
2006 and will be made pursuant to open-account advances, repayable upon demand
or on a date agreed by the parties to the transaction, but in any event not
later than one year after the date of the advance; provided, that each lending
party will at all times be entitled to receive upon demand one or more
promissory notes evidencing any and all loans by such lender. Any such note
shall: (a) be substantially in the form of Exhibit A to the form of Utility
Money Pool Agreement filed herewith, (b) be dated as of the date of the initial
borrowing, (c) mature on demand or on a date agreed by the parties to the
transaction, but in any event not later than one year after the date of the
applicable borrowing, and (d) be repayable in whole at any time or in part from
time to time, without premium or penalty.

          Operation. Operation of the Utility Money Pool, including record
keeping and coordination of loans, will be handled by Ameren Services under the
authority of the appropriate officers of the participating companies. Ameren
Services will continue to administer the Utility Money Pool on an "at cost"
basis.

     1.7 Non-Regulated Subsidiary Money Pool. Ameren also proposes to continue
to maintain and fund loans to certain of its non-utility subsidiaries and,
following the acquisition of CILCORP and AES Medina Valley, to certain of
CILCORP's current direct and indirect non-utility subsidiaries and to AES Medina
Valley and its direct and indirect non-utility subsidiaries, pursuant to a new
Non-Regulated Subsidiary Money Pool Agreement, the form of which is filed
herewith as Exhibit B-2. As is the case with the current Non-Utility Money Pool,
Ameren will participate in the Non-Regulated Subsidiary Money Pool solely as a
lender and may not make any borrowings from or receive any extension of credit
through the Non-Regulated Subsidiary Money Pool. CILCORP also proposes to
participate in the Non-Regulated Subsidiary Money Pool as a lender only and will
not be permitted to make borrowings from or receive any extension of credit
through the Non-Regulated Subsidiary Money Pool. Ameren Services will
participate in the Non-Regulated Subsidiary Money Pool (as it currently does in
the Non-Utility Money Pool) solely as a borrower.


                                       12



     CIGI also proposes to become a participant in the Non-Regulated Subsidiary
Money Pool following Ameren's acquisition of CILCORP. Although CIGI will be an
"electric utility company" under the Act once it relinquishes EWG status, for
purposes of state regulation in Illinois, CIGI will be considered to be a
"non-regulated" affiliate of CILCO and therefore cannot participate in the
Utility Money Pool. CIGI is requesting authorization to borrow up to $250
million at any time outstanding under the Non-Regulated Subsidiary Money Pool.
The interest rate payable on borrowings from and loans to the Non-Regulated
Subsidiary Money Pool and the allocation of fees and investment income to
participants will be determined in the same manner described above in connection
with the Utility Money Pool.

     Accordingly, following the acquisition of CILCORP and AES Medina Valley,
the following direct and indirect subsidiaries of Ameren will be participants in
the Non-Regulated Subsidiary Money Pool:

     Ameren Services (solely as a borrower)
     Ameren Development
     Ameren ERC
     Ameren Communications
     Ameren Energy Resources
     Ameren Energy Development
     Ameren GenCo
     Ameren Fuels
     AFS Development
     Illinois Materials
     UEDC
     CIC
     CILCORP (solely as a lender)
     CIGI
     CIM
     CVI
     CESI
     QST
     CILCO Exploration
     CILCO Energy
     AES Medina Valley
     AES Medina Valley Cogen (No. 2), L.L.C.
     AES Medina Valley Cogen
     AES Medina Valley Operations, L.L.C.

     The Commission is requested to reserve jurisdiction over the participation
in the Non-Regulated Subsidiary Money Pool of any other direct or indirect,
current or future, non-utility subsidiary of Ameren.

     1.8 Relationship to Orders in Other Proceedings. Upon the effective date of
the Commission's order in this proceeding, Ameren and its subsidiaries will
relinquish their authority under the 1998 Financing Order (File No. 70-9133) and
the Money Pool Order (File No. 70-9423), except with respect to any Short-term
Debt, Utility Money Pool borrowings or loans, Interest Rate Hedges, or


                                       13



Anticipatory Hedges that are outstanding on such date, which shall expire or
terminate in accordance with their terms.

     1.9 Certificates under Rule 24. The Applicants propose to file certificates
of notification pursuant to Rule 24 that report each of the transactions carried
out in accordance with the terms and conditions of and for the purposes
represented in this Application/Declaration. Such certificates of notification
would be filed within 60 days after the end of each of the first three calendar
quarters, and 90 days after the end of the last calendar quarter, in which
transactions occur. The Rule 24 certificates will contain the following
information for the reporting period:

          (a) The amount and terms of Short-term Debt issued by AmerenUE and
     AmerenCIPS (other than through the Utility Money Pool) during the quarter;

          (b) 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;

          (c) The maximum outstanding amount of all borrowings from and loans to
     the Utility Money Pool and the Non-Regulated Subsidiary Money Pool by each
     money pool participant during the quarter, and the rate or range of rates
     charged on borrowings by eligible Utility and Non-Regulated Subsidiary
     Money Pool participants and paid on loans to Utility and Non-Regulated
     Subsidiary Money Pool participants during the quarter;(13)

          (d) Consolidated balance sheets of Ameren, AmerenUE, AmerenCIPS,
     CILCORP, CILCO and CIGI as of the end of the calendar quarter, which may be
     incorporated by reference to filings by such companies under the Securities
     Act of 1933 or Securities Exchange Act of 1934.

ITEM 2. FEES, COMMISSIONS AND EXPENSES.
        ------------------------------

     The fees, commissions and expenses incurred or to be incurred in connection
with the preparation and filing of this Application/Declaration are estimated
not to exceed $10,000.

ITEM 3. APPLICABLE STATUTORY PROVISIONS.
        -------------------------------

     3.1 General. Sections 6(a), 7, 9(a)(1), 9(c)(3), 10, 12(b) and 12(f) of the
Act and Rules 40, 42, 43, 45, and 54 thereunder are applicable to the proposed
transactions.

     3.2 Compliance with Rule 54. The transactions proposed herein are also
subject to Rule 54. Rule 54 provides that, in determining whether to approve the
issue or sale of any securities for purposes other than the acquisition of an
EWG or "foreign utility company" ("FUCO") or other transactions unrelated to

----------
(13) For convenience and in order to simplify reporting, it is proposed that all
Utility Money Pool activity and all Non-Regulated Subsidiary Money Pool
activity, including transactions that are exempt under Rules 52 and 45(b)(1), be
reported as part of the quarterly Rule 24 certificate.


                                       14



EWGs or FUCOs, the Commission shall not consider the effect of the
capitalization or earnings of subsidiaries of a registered holding company that
are EWGs or FUCOs if Rule 53(a), (b) and (c) are satisfied. Under Rule 53(a),
the Commission shall not make certain specified findings under Sections 7 and 12
in connection with a proposal by a holding company to issue securities for the
purpose of acquiring the securities of or other interest in an EWG, or to
guarantee the securities of an EWG, if each of the conditions in paragraphs
(a)(1) through (a)(4) thereof are met, provided that none of the conditions
specified in paragraphs (b)(1) through (b)(3) of Rule 53 exists. These standards
are met.

     Rule 53(a)(1): Ameren's "aggregate investment" in EWGs is approximately
$406,397,430, or approximately 23.1% of Ameren's average "consolidated retained
earnings" for the four quarters ended September 30, 2002 ($1,757,119,306).
Ameren does not hold an interest in any FUCO.

     Rule 53(a)(2): Ameren will maintain books and records enabling it to
identify investments in and earnings from each EWG and FUCO in which it directly
or indirectly acquires and holds an interest. Ameren will cause each domestic
EWG in which it acquires and holds an interest, and each foreign EWG and FUCO
that is a majority-owned subsidiary, to maintain its books and records and
prepare its financial statements in conformity with U.S. generally accepted
accounting principles. All of such books and records and financial statements
will be made available to the Commission, in English, upon request.

     Rule 53(a)(3): No more than 2% of the employees of Ameren's domestic
utility subsidiaries will, at any one time, directly or indirectly, render
services to EWGs and FUCOs.

     Rule 53(a)(4): Ameren will submit a copy of each Application/Declaration
relating to investments in EWGs and FUCOs and copies of any related Rule 24
certificates, as well as a copy of Ameren's Form U5S, to each of the public
service commissions having jurisdiction over the retail rates of Ameren's
domestic utility subsidiaries.

     In addition, Ameren states that the provisions of Rule 53(a) are not made
inapplicable to the authorization herein requested by reason of the occurrence
or continuance of any of the circumstances specified in Rule 53(b). Rule 53(c)
is inapplicable by its terms.

ITEM 4. REGULATORY APPROVAL.
        -------------------

     The participation of AmerenCIPS and AmerenUE in the Utility Money Pool has
been approved by the ICC. (See Exhibit D-2). The participation of CILCO in the
Utility Money Pool also requires approval of the ICC. A copy of CILCO's
application to the ICC will be filed as Exhibit D-3 hereto and a copy of the ICC
order will be filed as Exhibit D-4 hereto. No other state commission, and no
federal commission, other than the Commission, has jurisdiction over any of the
transactions proposed in this Application/Declaration.


                                       15



ITEM 5. PROCEDURE.
        ---------

     The Commission is requested to publish a notice under Rule 23 with respect
to the filing of this Application/Declaration as soon as practicable. The
Applicants request that the Commission's order be issued as soon as the rules
allow, and that there should not be a 30-day waiting period between issuance of
the Commission's order and the date on which the order is to become effective.
The Applicants hereby waive a recommended decision by a hearing officer or any
other responsible officer of the Commission and consent to the participation of
the Division of Investment Management in the preparation of the Commission's
decision and/or order, unless such Division opposes the matters proposed herein.

ITEM 6. EXHIBITS AND FINANCIAL STATEMENTS.
        ---------------------------------

          A. EXHIBITS.
             --------

          A    None.

          B-1  Utility Money Pool Agreement (incorporated by reference to
               Exhibit B to Form U-1 Application/Declaration, dated November 25,
               1998, in File No. 70-9423).

          B-2  Form of Non-Regulated Subsidiary Money Pool Agreement.

          C    None.

          D-1  Application by Ameren, AmerenCIPS, AmerenUE and Ameren Services
               to Illinois Commerce Commission (incorporated by reference to
               Exhibit D-1 to Form U-1 Application/Declaration, dated November
               25, 1998, in File No. 70-9423).

          D-2  Illinois Commerce Commission Order (incorporated by reference to
               Exhibit D-2 to Form U-1 Application/Declaration, dated November
               25, 1998, in File No. 70-9423).

          D-3  Application by CILCO to Illinois Commerce Commission for
               Authorization to Participate in Utility Money Pool. (To be filed
               by amendment).

          D-4  Order of the Illinois Commerce Commission Approving Participation
               of CILCO in Utility Money Pool. (To be filed by amendment).

          E    None.

          F    Opinion of Counsel. (To be filed by amendment).


                                       16



          G    Proposed Form of Federal Register Notice.

          B. FINANCIAL STATEMENTS.
             --------------------



                                      
          FS-1  Consolidated Balance Sheet     Incorporated by reference to the
                and Statement of Income of     Quarterly Report of Ameren
                Ameren Corporation as of       Corporation on Form 10-Q for the
                and for the nine months        quarter ended September 30, 2002
                ended September 30, 2002       in File No. 1-14756

          FS-2  Balance Sheet and Income       Incorporated by reference to the
                Statement of Union Electric    Quarterly Report of Union Electric
                Company as of and for the      Company on Form 10-Q for the
                nine months ended              quarter ended September 30, 2002
                September 30, 2002             in File No. 1-2967

          FS-3  Balance Sheet and Income       Incorporated by reference to the
                Statement of Central Illinois  Quarterly Report of Central Illinois
                Public Service Company as      Public Service Company on Form
                of and for the nine months     10-Q for the quarter ended
                ended September 30, 2002       September 30, 2002 in File No.
                                               1-3672

          FS-4  Consolidated Balance Sheet     Incorporated by reference to the
                and Statement of Income of     Quarterly Report on Form 10-Q of
                CILCORP Inc. as of and for     CILCORP Inc. for the period ended
                the nine months ended          September 30, 2002 in File No.
                September 30, 2002             1-8946

          FS-5  Consolidated Balance Sheet     Incorporated by reference to the
                and Statement of Income of     Quarterly Report on Form 10-Q of
                Central Illinois Light         Central Illinois Light Company for
                Company as of and for          the period ended September 30,
                the nine months ended          2002 in File No. 1-2732
                September 30, 2002



ITEM 7. INFORMATION AS TO ENVIRONMENTAL EFFECTS.
        ---------------------------------------

     None of the matters that are the subject of this Application/Declaration
involves a "major federal action" nor do such matters "significantly affect the
quality of the human environment" as those terms are used in section 102(2)(C)
of the National Environmental Policy Act. The transactions that are the subject
of this Application/Declaration will not result in changes in the operation of
the Applicants that will have an impact on the environment. The Applicants are
not aware of any federal agency that has prepared or is preparing an
environmental impact statement with respect to the transactions that are the
subject of this Application/Declaration.


                                       17



                                   SIGNATURES


     Pursuant to the requirements of the Public Utility Holding Company Act of
1935, the undersigned companies have duly caused this Application/Declaration to
be signed on their behalves by the undersigned thereunto duly authorized.


                                       AMEREN CORPORATION
                                       UNION ELECTRIC COMPANY
                                       CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
                                       AMEREN SERVICES COMPANY
                                       AMEREN ENERGY, INC.
                                       AMEREN DEVELOPMENT COMPANY
                                       AMEREN ERC, INC.
                                       AMEREN ENERGY COMMUNICATIONS, INC.
                                       AMEREN ENERGY RESOURCES COMPANY
                                       AMEREN ENERGY DEVELOPMENT COMPANY
                                       AMEREN ENERGY GENERATING COMPANY
                                       AMEREN ENERGY MARKETING COMPANY
                                       AMEREN ENERGY FUELS AND SERVICES COMPANY
                                       AFS DEVELOPMENT COMPANY LLC
                                       ILLINOIS MATERIALS SUPPLY CO.
                                       UNION ELECTRIC DEVELOPMENT CORPORATION
                                       CIPSCO INVESTMENT COMPANY


                                       By: /s/ Steven R. Sullivan
                                               ------------------
                                       Name:   Steven R. Sullivan
                                       Title:  Vice President Regulatory Policy,
                                               General Counsel and Secretary


                       (signatures continued on next page)


                                       18





                                       CILCORP INC.
                                       CENTRAL ILLINOIS LIGHT COMPANY
                                       CENTRAL ILLINOIS GENERATION, INC.
                                       CILCORP INVESTMENT MANAGEMENT INC.
                                       CILCORP VENTURES INC.
                                       QST ENTERPRISES INC.
                                       CILCORP ENERGY SERVICES INC.
                                       CILCO EXPLORATION AND DEVELOPMENT COMPANY
                                       CILCO ENERGY CORPORATION


                                       By: /s/ Craig Stensland
                                               ---------------
                                       Name:   Craig Stensland
                                       Title:  Secretary


                                       AES MEDINA VALLEY COGEN (NO. 4), L.L.C.
                                       AES MEDINA VALLEY COGEN, L.L.C.
                                       AES MEDINA VALLEY COGEN (NO. 2), L.L.C.
                                       AES MEDINA VALLEY OPERATIONS, L.L.C.


                                       By: /s/ Paul Santos
                                               -----------
                                       Name:   Paul Santos
                                       Title:  Vice President and
                                                 Chief Financial Officer


Date: November 20, 2002


                                       19