(As filed on April 4, 2001)

                                                              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
                              1901 Chouteau Avenue
                            St. Louis, Missouri 63103

              (Name of company filing this statement and address of
                          principal executive offices)

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

                               AMEREN CORPORATION

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

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

                       Steven R. Sullivan, Vice President,
                          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, Esq.                   William T. Baker, Jr., Esq.
     Ameren Services Company                 Thelen Reid & Priest LLP
     1901 Chouteau Avenue                    40 West 57th Street
     St. Louis, Missouri  63103              New York, New York  10019





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. For the year ended December 31, 2000,
Ameren reported total operating revenues of $3,855,849,000, of which
approximately 91.4% were derived from electric operations and 8.4% from gas
operations.

     In addition to its two public-utility subsidiaries, Ameren directly owns
all of the issued and outstanding common stock of five non-utility subsidiary
companies, as follows:

     (1) Ameren Services Company, a subsidiary service company.

     (2) Ameren Energy, Inc., an "energy-related company" within the meaning of
Rule 58 that engages in short-term wholesale purchases and sales of electricity
as agent for AmerenUE and Ameren Energy Generating Company ("Genco").

     (3) Ameren Development Company ("Ameren Development"), an intermediate
non-utility holding company that was formed to acquire and hold the securities
of other exempt and authorized non-utility companies. Ameren Development's
direct and indirect subsidiaries include Ameren Energy Communications, Inc., an
"exempt telecommunications company" ("ETC") within the meaning of Section 34 of
the Act, and Ameren ERC, Inc., an "energy-related company" within the meaning of
Rule 58 that engages in various activities permitted under such rule (chiefly,
steam production and sales and fuel transportation).

     (4) Ameren Energy Resources Company ("Resources"), also an intermediate
non-utility holding company, which holds the securities of other exempt and
authorized non-utility companies. Resources owns all of the issued and
outstanding common stock of Ameren Energy Development Company, an "exempt
wholesale generator" ("EWG") within the meaning of Section 32 of the Act 1  that
engages primarily in development and construction activities relating to EWGs
and holds all of the issued and outstanding common stock of Genco, which is also
an EWG.2  Genco was formed to acquire all of the generating assets of AmerenCIPS
(2,860 MW), which occurred in May 2000, and, in addition, is the vehicle through
which Ameren expects to own and operate up to an additional 2,894 MW of new
gas-fired generation in the Midwest. Resources also holds all of the common
stock of Ameren Energy Fuels and Services Company and Ameren Energy Marketing
Company, which engage in businesses permitted by Rule 58, and Illinois Materials


------------------------
1    See Ameren Energy Development Company, 92 FERC P. 62,238 (June 29, 2000).

2    See Ameren Energy Generating Company, 92 FERC P. 62,023 (July 14, 2000).


                                       2



Supply Co., which manages materials acquisition for certain of Ameren's EWG
projects in Illinois.

     (5) CIPSCO Investment Company, which manages various non-utility
investments.

     The aforementioned direct and indirect non-utility subsidiaries of Ameren,
and any other current or future non-exempt, non-utility subsidiaries of Ameren
are hereafter referred to collectively as the "Non-utility Subsidiaries." An
organizational chart of the Ameren system is filed herewith as Exhibit E.

     Under its Restated Articles of Incorporation, as amended (Exhibit A-1
hereto), Ameren is authorized to issue 500,000,000 shares of capital stock
consisting of 400,000,000 shares of common stock, $.01 par value ("Common
Stock"), and 100,000,000 shares of preferred stock, $.01 par value ("Preferred
Stock"), which may be issued in one or more series with such designations as are
approved by Ameren's board of directors. As of December 31, 2000, Ameren had
issued and outstanding 137,215,462 shares of Common Stock; Ameren does not have
any outstanding Preferred Stock.

     As of December 31, 2000, Ameren's capitalization on a consolidated basis
was as follows: common stock equity - 49.8%; preferred stock equity - 3.6%;
long-term debt (excluding current maturities) - 42.7%; and short-term debt
(including current maturities of long-term debt) - 3.9%.

     1.2  Ameren's Current Financing Authorization.
          ----------------------------------------

          1.2.1  File No. 70-9133. By order dated March 13, 1998 in File No.
                 ----------------
70-9133,3  as amended by order dated April 26, 1999 4 (as so amended, the
"Current Financing Order"), Ameren is authorized to issue and sell from time to
time through February 27, 2003 (i) up to 25 million shares of Common Stock for
general corporate purposes other than for use under Ameren's dividend
reinvestment and employee benefit plans, (ii) commercial paper and/or other
short-term debt ("Short-term Debt") in an aggregate principal amount at any one
time outstanding not to exceed $1.5 billion, and (iii) unsecured notes having
maturities of more than one year and up to 40 years ("Debentures") in an
aggregate principal amount at any time outstanding not to exceed $300 million,
subject to an overall limitation of $1.5 billion on the aggregate principal
amount of Short-term Debt and Debentures at any one time outstanding. In
addition, Ameren is authorized to provide guarantees and other forms of credit
support ("Guarantees") on behalf of its Non-utility Subsidiaries in an aggregate
amount at any one time outstanding not to exceed $1 billion. Ameren has not
issued and sold any shares of Common Stock or Debentures pursuant to the
authority granted under the Current Financing Order. At December 31, 2000,
Ameren had $167 million aggregate principal amount of Short-term Debt
outstanding, and had outstanding Guarantees aggregating approximately $77
million.


------------------------
3    See Ameren Corporation, et al., Holding Co. Act Release No. 26841 (Mar.
13, 1998).

4    See Ameren Corporation, et al., Holding Co. Act Release No. 27011 (Apr.
26, 1999).


                                       3



          1.2.2  File No. 70-8945. In addition, under the terms of the
                 ----------------
Commission's order approving Ameren's acquisition of AmerenUE and AmerenCIPS
(the "Merger Order"),5  Ameren is authorized to issue and/or acquire in open
market transactions for the purpose of issuance, from time to time through
December 30, 2002, an additional 15 million shares of its Common Stock under its
dividend reinvestment plan and certain employee benefit plans, as described in
Item 1.5.1 below. Any shares of Common Stock used to fund these plans may be, at
the discretion of Ameren, authorized but unissued shares, treasury shares or
shares purchased by Ameren on the open market by an independent plan
administrator or agent. Through December 31, 2000, Ameren had purchased a total
of 6,426,091 shares of Common Stock for delivery under these plans.

          1.2.3  File No. 70-9177. By order dated April 24, 1998 in File No.
                 ----------------
70-9177 ("Incentive Plan Order"),6  Ameren is authorized , through March 31,
2003, to issue and/or acquire in the open market up to 4 million shares of its
Common Stock for purposes of making awards under its long-term incentive plan,
as described in Item 1.5.1 below. This is in addition to shares of Common Stock
that may be issued or purchased under the Current Financing Order and Merger
Order. Any shares of Common Stock used to fund this plan may be, at the
discretion of Ameren, authorized but unissued shares, treasury shares or shares
purchased by Ameren on the open market by an independent plan administrator or
agent. Through March 31, 2001, Ameren had issued a total of 2,425,800 Common
Stock units represented by options and 141,788 restricted shares of Common Stock
under the long-term incentive plan.

          1.2.4  File No. 70-9427. By order dated July 23, 1999 in File No.
                 ----------------
70-9427 ("Restructuring Order"),7  Ameren is authorized, through December 31,
2003, to, among other things, organize and acquire the equity securities of one
or more new subsidiaries ("Financing Subsidiaries") to facilitate the issuance
and sale of long-term debt or equity securities to investors other than Ameren
in order to finance Ameren's direct or indirect investments in Non-utility
Subsidiaries. Under the Restructuring Order, the Commission reserved
jurisdiction over the transfer of any financing proceeds of a Financing
Subsidiary to Ameren pending completion of the record.

     1.3  Summary of Requested Approvals. Ameren proposes herein to amend and
          ------------------------------
restate its current financing authorization, as contained in the Current
Financing Order, Merger Order, and Incentive Plan Order in order to, among other
things, extend the authorization period for such financings, increase the
authorized limits, and expand the types of securities that Ameren may issue
directly or indirectly through a Financing Subsidiary. Upon the effective date
of the Commission's order in this proceeding, Ameren will relinquish its
authority to issue securities (including Guarantees) under the Current Financing
Order, the Merger Order, and the Incentive Plan Order. In addition, Ameren is
requesting that the Commission release jurisdiction reserved under the
Restructuring Order over the transfer of proceeds of a Financing Subsidiary to
Ameren.


------------------------
5    See Ameren Corporation, Holding Co. Act Release No. 26809 (Dec. 30,
1997).

6    See Ameren Corporation, et al., Holding Co. Act Release No. 26862 (Apr.
24, 1998).

7    See Ameren Corporation, et al., Holding Co. Act Release No. 27053 (July
23, 1999).


                                       4



     Specifically, Ameren requests approval for a program of external financing
and credit support arrangements for the period through June 30, 2005
("Authorization Period"), as follows:

     (i)  Ameren requests authority to issue and sell from time to time,
          directly or indirectly through one or more direct Financing
          Subsidiaries, equity securities and long-term debt securities in an
          aggregate amount at any time outstanding not to exceed $2.5 billion.
          Within such overall financing limitation, Ameren proposes to issue and
          sell Common Stock and Preferred Stock 8  and, directly or through one
          or more direct Financing Subsidiaries, unsecured long-term
          indebtedness ("Long-term Debt") and other forms of preferred or
          equity-linked securities having maturities of up to 50 years.

     (ii) Ameren requests authority to issue up to 25 million shares of Common
          Stock pursuant to its dividend reinvestment plan and employee savings
          and incentive compensation plans maintained for its officers and
          employees, or other similar stock-based plans adopted in the future,
          such shares to be in addition to any shares of Common Stock issued
          under the authority requested in (i), above.

     (iii) Ameren requests authority to issue and sell from time to time,
          directly or indirectly through one or more Financing Subsidiaries,
          Short-term Debt in an aggregate principal amount at any time
          outstanding not to exceed $1.5 billion.

     (iv) Ameren requests authority to provide Guarantees on behalf or for the
          benefit of its Non-utility Subsidiaries in an aggregate principal or
          nominal amount not to exceed $1.5 billion at any one time outstanding,
          provided that any securities issued by Financing Subsidiaries of
          Ameren that are guaranteed or supported by other forms of credit
          enhancement provided by Ameren will not count against this limitation.

     Ameren represents that at no time during the Authorization Period will any
securities be issued hereunder if after the issuance thereof common equity as a
percentage of Ameren's consolidated capitalization (including Short-term Debt)
would be below 30%. Further, Ameren represents that it will maintain common
equity as a percentage of capitalization of AmerenUE and AmerenCIPS at 30% or
above during the Authorization Period.

     In addition to the foregoing financing proposals, Ameren is requesting that
the Commission release jurisdiction heretofore reserved under the Restructuring
Order over the transfer of any financing proceeds of a Financing Subsidiary to
Ameren.


------------------------
8    Any shares of Preferred Stock issued under the authorization in this
proceeding would be in addition to any Preferred Stock that may be issued under
Ameren's stock purchase rights plan, as authorized by the Commission. See Ameren
Corporation, Holding Co. Act Release No. 26961 (Dec. 29, 1998).


                                       5



     1.4  Use of Proceeds. Ameren will utilize the proceeds of financing
          ---------------
authorized hereunder for general and corporate purposes including: (a)
financing, in part, of the capital expenditures of Ameren and its subsidiaries;
(b) financing working capital requirements and capital spending of the Ameren
system; (c) financing exempt acquisitions of interests in EWGs and "foreign
utility companies" ("FUCOs"), subject to the limitations of Rule 53; (d)
financing exempt acquisitions of interests in "energy-related companies," as
defined in Rule 58, subject to the limitations of that rule; (e) the
acquisition, retirement, refinancing or redemption of securities of which Ameren
is the issuer pursuant to Rule 42; and/or (f) the acquisition of the securities
of other types of non-utility companies as authorized by the Commission in a
separate proceeding.

     1.5  Description of Specific Financing Proposals. Ameren contemplates that
          -------------------------------------------
Common Stock, Preferred Stock, Long-term Debt and other preferred or
equity-linked securities (including units with incorporated options, warrants
and/or forward equity purchase contracts or provisions) that are exercisable or
exchangeable for or convertible into Common Stock would be issued directly to
one or more purchasers in privately-negotiated transactions or to one or more
investment banking or underwriting firms or other entities who would resell such
securities without registration under the Securities Act of 1933 in reliance
upon one or more applicable exemptions from registration thereunder, or to the
public either (i) through underwriters selected by negotiation or competitive
bidding or (ii) through selling agents acting either as agent or as principal
for resale to the public either directly or through dealers. All such securities
sales will be at rates or prices and under conditions negotiated or based upon,
or otherwise determined by, competitive capital markets.

          1.5.1  Common Stock. Ameren may issue and sell Common Stock through
                 ------------
underwriters or dealers, through agents, or directly to a limited number of
purchasers or a single purchaser. If underwriters are used in the sale of Common
Stock, such securities will be acquired by the underwriters for their own
account and may be resold from time to time in one or more transactions,
including negotiated transactions, at a fixed public offering price or at
varying prices determined at the time of sale. Common Stock may be offered to
the public either through underwriting syndicates (which may be represented by a
managing underwriter or underwriters designated by Ameren) or directly by one or
more underwriters acting alone. Common Stock may be sold directly by Ameren or
through agents designated by Ameren from time to time. If dealers are utilized
in the sale of Common Stock, Ameren will sell such securities to the dealers, as
principals. Any dealer may then resell such Common Stock to the public at
varying prices to be determined by such dealer at the time of resale. If Common
Stock is being sold in an underwritten offering, Ameren may grant the
underwriters thereof a "green shoe" option permitting the purchase from Ameren
at the same price of additional shares solely for the purpose of covering
over-allotments.

     Ameren may also issue Common Stock or options, warrants or other stock
purchase rights exercisable for Common Stock in public or privately-negotiated
transactions as consideration for the equity securities or assets of other
companies, provided that the acquisition of any such equity securities or assets


                                       6



has been authorized in a separate proceeding or is exempt under the Act or the
rules thereunder (specifically Rule 58).9

     Ameren also proposes to issue Common Stock and/or purchase shares of its
Common Stock (either currently or under forward contracts) in the open market
for purposes of reissuing such shares at a later date under stock-based plans
that it or any of its subsidiaries maintain for shareholders, investors,
employees and nonemployee directors (collectively, "Plans"). Currently, Ameren
maintains the following stock-based Plans for its shareholders and employees:

     o    Dividend Reinvestment Plan. Ameren's dividend reinvestment and stock
          --------------------------
          purchase plan ("DRPlus") is intended to provide participants with a
          convenient way to purchase Common Stock and to reinvest all or a
          portion of the dividends received on Common Stock or on preferred
          stock of AmerenUE or AmerenCIPS in additional shares of Common Stock.
          In addition, participants in the DRPlus may make optional cash
          purchases of Common Stock in a minimum amount of $25 per transaction
          after the initial investment and up to a maximum of $120,000 per year.
          Eligible non-shareholders may enroll in the DRPlus by making an
          initial minimum cash investment of $250. Eligible non-shareholders who
          are employees of Ameren or its subsidiaries may authorize a minimum
          payroll deduction investment of $25 per pay period to purchase Common
          Stock. If shares of Common Stock for issuance under the DRPlus are
          purchased on the open market or in privately negotiated transactions,
          the price of such shares shall be the weighted average price at which
          an independent agent acquired such shares on the applicable investment
          date plus applicable brokerage commissions and other fees. If Ameren
          chooses to issue new shares of Common Stock, the price on the
          applicable investment date will be the average of the high and low
          sales prices for Ameren's Common Stock reported as New York Stock
          Exchange Composite Transactions. Ameren has registered 6,500,000
          shares of Common Stock for issuance under the DRPlus. A full
          description of the DRPlus is included in Post-Effective Amendment No.
          1 to Ameren's Registration Statement on Form S-3, which is
          incorporated by reference as Exhibit C-1 hereto.

     o    Ameren Long-term Incentive Plan. In 1998, Ameren adopted a long-term
          -------------------------------
          incentive plan ("1998 Incentive Plan") for eligible employees,
          replacing the plan previously in place at AmerenUE. The 1998 Incentive
          Plan provides for the grant of options, performance awards, restricted
          stock, dividend equivalents and stock appreciation rights. Under the
          terms of the plan, options may be granted at a price not less than the
          fair market value of Ameren's Common Stock at the date of the grant.
          Granted options vest over a period of five years, beginning at the
          date of the grant, and provide for acceleration of exercisability of
          the options upon the occurrence of certain events, including
          retirement. Outstanding options expire on various dates through 2010.
          Ameren has registered 4,000,000 shares of Common Stock for issuance or
          delivery under the 1998 Incentive Plan. See Registration Statement on


------------------------
9    The Commission has previously approved the issuance of common stock as
consideration for the acquisition of a new business in an exempt transaction or
transaction that has been approved in a separate proceeding. See e.g., SCANA
Corp., Holding Co. Act Release No. 27137 (Feb. 14, 2000).


                                       7



          Form S-8, which is incorporated by reference as Exhibit C-2 hereto.
          The 1998 Incentive Plan is incorporated by reference as Exhibit H
          hereto.

     o    Ameren Corporation Savings Investment Plan (formerly the Union
          ------------------------------------------
          Electric Savings Investment Plan). Ameren maintains an employee
          savings investment plan ("SIP") which permits eligible participants
          under Section 401(k) of the Internal Revenue Code to defer current
          federal income taxes on contributions to the SIP and earnings thereon.
          The plan is open to both management and union (contract) employees.
          All eligible employees who are at least 21 years old and have
          completed 1 year of service can participate. Participants may
          contribute via payroll deductions up to 15% of their base pay and can
          invest in one or more investment funds, including the Ameren Common
          Stock Fund. Ameren, to the extent sufficient earnings are available,
          may partially match contributions made to the SIP by participants. The
          match, if any, and the allocation of matching contributions for
          contract employees are established by the collective bargaining
          agreement of the participant's bargaining unit. Ameren has registered
          2,600,000 shares of Common Stock for issuance or delivery under the
          SIP. See Registration Statement on Form S-8, which is incorporated by
          reference as Exhibit C-3 hereto.

     o    Ameren Corporation Employee Long-term Savings Plan. Ameren sponsors
          --------------------------------------------------
          two investment savings plans that permit employees of AmerenCIPS and
          Genco who are members of certain collective bargaining units to defer
          federal income taxes on contributions to the plans and earnings
          thereon. The plans are qualified plans under Section 401(k) of the
          Internal Revenue Code. Participants can participate in only one plan.
          Employees who have one year of service and have attained the age of 21
          can participate in one of the available plans. A participant can
          contribute up to 15% of his or her compensation into a plan and invest
          in one or more investment funds, including the Ameren Common Stock
          Fund. Ameren, to the extent sufficient earnings are available, may
          partially match contributions made to these plans by participants. The
          match, if any, and the allocation of matching contributions are
          established by the collective bargaining agreement of the
          participant's bargaining unit. Ameren has registered 400,000 shares of
          Common Stock for issuance or delivery under each of these plans. See
          Post-Effective Amendment No. 2 to Ameren's Registration Statement on
          Form S-8, which is incorporated by reference as Exhibit C-4 hereto.

     Ameren proposes to issue shares of its Common Stock under the authorization
and within the limitations set forth herein in order to satisfy its obligations
under each of these existing Plans. Shares of Common Stock issued under these
Plans may either be newly issued shares, treasury shares or shares purchased in
the open market. Ameren will make open-market purchases of Common Stock in
accordance with the terms of or in connection with the operation of the Plans
pursuant to Rule 42. Ameren also proposes, within the limitations set forth
herein, to issue and/or purchase shares of Common Stock pursuant to these
existing Plans, as they may be amended or extended, and pursuant to any similar
plans or plan funding arrangements hereafter adopted without any additional
Commission order.


                                       8



          1.5.2  Preferred Stock, Long-term Debt and other Preferred or
                 ------------------------------------------------------
Equity-Linked Securities. Ameren proposes to issue Preferred Stock or, directly
------------------------
or indirectly through one or more Financing Subsidiaries, to issue Long-term
Debt and other types of preferred or equity-linked securities (including,
specifically, trust preferred securities and convertible securities). The
proceeds of Preferred Stock, Long-term Debt or other preferred or equity-linked
securities would provide an important source of future financing primarily for
use in the operations of and to fund investments in Ameren's authorized and
exempt Non-utility Subsidiaries under the Act.10

     Preferred Stock or other types of preferred or equity-linked securities may
be issued in one or more series with such rights, preferences, and priorities as
may be designated in the instrument creating each such series, as determined by
Ameren's board of directors. All such securities will be redeemed no later than
50 years after the issuance thereof, unless converted into Common Stock. The
dividend rate on any series of Preferred Stock or other preferred or
equity-linked securities will not exceed at the time of issuance 700 basis
points over the yield to maturity of a U.S. Treasury security having a remaining
term equal to the term of such securities, or, if no such Treasury security is
outstanding, then the yield to maturity of a 30-year U.S. Treasury Bond.
Dividends or distributions on Preferred Stock or other preferred or
equity-linked securities will be made periodically and to the extent funds are
legally available for such purpose, but may be made subject to terms that allow
the issuer to defer dividend payments or distributions for specified periods.
Preferred Stock or other preferred or equity-linked securities may be
convertible or exchangeable into shares of Common Stock and may be issued in the
form of shares or units.

     Long-term Debt of a particular series (a) may be convertible into any other
securities of Ameren, (b) will have a maturity ranging from one to 50 years, (c)
will bear interest at a rate not to exceed at the time of issuance 500 basis
points over the yield to maturity of a U.S. Treasury security having a remaining
term equal to the average life of such Long-term Debt, or, if no such Treasury
security is outstanding, then the yield to maturity of a 30-year U.S. Treasury
Bond, (d) may be subject to optional and/or mandatory redemption, in whole or in
part, at par or at various premiums above the principal amount thereof, (e) may
be entitled to mandatory or optional sinking fund provisions, (f) may provide
for reset of the coupon pursuant to a remarketing or auction arrangement, and
(g) may be called from existing investors by a third party. The maturity dates,
interest rates, redemption and sinking fund provisions and conversion features,


------------------------
10   The Commission has approved a similar financing application filed by The
Southern Company ("Southern") in which Southern requested approval to issue
preferred securities and long-term debt, directly or indirectly through
special-purpose financing entities. See The Southern Company, Holding Co. Act
Release No. 27134 (Feb. 9, 2000). In that case, the Commission took account of
the changing needs of registered holding companies for sources of capital other
than common equity and short-term debt brought about primarily by the
elimination of restrictions under the Act on investments in various types of
non-core businesses (e.g., EWGs, FUCOs, ETCs and businesses allowed by Rule 58).
The Commission noted that, without the ability to raise capital in external
markets that is appropriate for such investments, registered holding companies
would be at a competitive disadvantage to other energy companies that are not
subject to regulation under the Act.


                                       9



if any, with respect to the Long-term Debt of a particular series, as well as
any associated placement, underwriting or selling agent fees, commissions and
discounts, if any, will be established by negotiation or competitive bidding.
Ameren commits to maintain a rating for all Long-term Debt that is at the
investment grade level as established by at least one nationally recognized
statistical rating organization, as that term is used in paragraphs
(c)(2)(vi)(E), (F) and (H) of Rule 15c3-1 under the Securities Exchange Act of
1934.

          1.5.3  Short-term Debt. Ameren proposes to issue and sell from time to
                 ---------------
time Short-term Debt in an aggregate principal amount at any time outstanding
not to exceed $1.5 billion. 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.

     Ameren also proposes to establish and maintain back-up credit lines with
banks or other institutional lenders to support its commercial paper program(s)
and other credit arrangements and/or borrowing facilities generally available to
borrowers with comparable credit ratings as it may deem appropriate in light of
its needs and existing market conditions providing for revolving credit or other
loans and having commitment periods not longer than the Authorization Period.
Loans under these lines will have maturities of less than one year from the date
of each borrowing. Only the amounts drawn and outstanding under these agreements
and facilities will be counted against the proposed limit on Short-term Debt.

     The effective cost of money on all Short-term Debt will not exceed at the
time of issuance 300 basis points over the London Interbank Offered Rate
("LIBOR").

     1.6  Guarantees. Ameren requests authorization to provide Guarantees with
          ----------
respect to the debt or contractual obligations of any Non-utility Subsidiary as
may be appropriate in the ordinary course of such subsidiary's business, in an
aggregate principal amount not to exceed $1.5 billion outstanding at any one
time, provided however, that the amount of any Guarantees in respect of
obligations of any Non-utility Subsidiaries shall also be subject to the
limitations of Rule 53(a)(1) or Rule 58(a)(1), as applicable. In addition to
parent guarantees, Guarantees may also be provided in the form of formal credit
enhancement agreements, including but not limited to "keep well" agreements and
reimbursement undertakings under letters of credit. The proposed limitation on
Guarantees shall not include the amount of any guarantees or other forms of
credit support provided with respect to securities issued by any Financing
Subsidiary (the amounts of which would count only against the proposed
limitations on the amounts of debt and equity securities that Ameren may issue).
Ameren may charge any Non-utility Subsidiary a fee for each Guarantee provided
on its behalf that is not greater than the cost, if any, of obtaining the
liquidity necessary to perform the guarantee (for example, bank line commitment
fees or letter of credit fees, plus other transactional expenses) for the period
of time the Guarantee remains outstanding.


                                       10



     1.7  Financing Subsidiaries. Subsequent to the date of the Restructuring
          ----------------------
Order, which, as indicated, authorizes Ameren to organize and acquire the equity
securities of one or more Financing Subsidiaries, the Commission issued an order
in an unrelated proceeding approving the transfer of proceeds of financing by a
financing entity to a registered holding company by dividend, loan or other
distribution. See The Southern Company, supra n.10. In that case, the Commission
held that the upstream transfer of funds to Southern by an entity formed
exclusively for the purpose of serving as the vehicle by which Southern may seek
to raise capital would not violate the prohibition in Section 12(a) of the Act
on loans or extensions of credit to a registered holding company, even if the
transfer is booked as a loan. For the reasons articulated by the Commission in
The Southern Company, it is appropriate that the Commission release jurisdiction
heretofore reserved under the Restructuring Order over the transfer of financing
proceeds by a Financing Subsidiary to Ameren.

     1.8  Certificates of Notification. Ameren proposes 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 sales of any Common Stock and the purchase price per share and
     the market price per share at the date of the agreement of sale;

          (b) 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;

          (c) 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;

          (d) The amount and terms of any Long-term Debt, Preferred Stock or
     other preferred or equity-linked securities issued directly or indirectly
     by Ameren during the calendar quarter;

          (e) The amount and terms of any Short-term Debt issued directly or
     indirectly by Ameren during the calendar quarter;

          (f) 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;

          (g) The name and amount invested by Ameren in any Financing Subsidiary
     during the calendar quarter; and


                                       11



          (h) Consolidated balance sheet of Ameren as of the end of the calendar
     quarter.11

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]. The above fees do not include underwriting fees,
registration fees under the Securities Act of 1933, dealer discounts, commitment
fees, compensating balances, fees for obtaining letters of credit, rating agency
fees, and other similar fees and expenses customarily incurred in connection
with the issuance of securities or obtaining third-party credit support. Such
fees, commissions and expenses will not exceed 6% of the amount of any specific
financing transaction covered by this Application/Declaration.

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

     3.1  General. Sections 6(a) and 7 of the Act are applicable to the issuance
          -------
and sale of Common Stock, Preferred Stock, other preferred or equity-linked
securities, Long-term Debt and Short-term Debt by Ameren. In addition, Sections
6(a), 7 and 12(b) of the Act and Rule 45(a) are applicable to the issuance of
Guarantees by Ameren.

     3.2  Compliance with Rules 53 and 54. The transactions proposed herein are
          -------------------------------
also subject to Rules 53 and 54. 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. Rule 54 provides that the Commission shall not
consider the effect of the capitalization or earnings of subsidiaries of a
registered holding company that are EWGs or FUCOs in determining whether to
approve other transactions if Rule 53(a), (b) and (c) are satisfied. These
standards are met.

     Rule 53(a)(1): Ameren's "aggregate investment" in EWGs and FUCOs is
approximately $204,600,000, or approximately 13% of Ameren's "consolidated
retained earnings" at December 31, 2000.12

     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


------------------------
11   Any of the information described in items (a) through (h) that is
provided in filings under the Securities Act of 1933 or Securities Exchange Act
of 1934 may be incorporated into the Rule 24 certificate by reference.

12   Ameren does not currently hold an interest in any FUCO.


                                       12



prepare its financial statements in conformity with U.S. generally accepted
accounting principles ("GAAP"). 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 the Application/Declaration in
this proceeding and each amendment thereto, and will submit copies of any Rule
24 certificates required hereunder, 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.
          -------------------

     No state commission, and no federal commission, other than the Commission,
has jurisdiction over any of the transactions proposed in this
Application/Declaration.

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. Ameren
requests 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.
Ameren hereby waives a recommended decision by a hearing officer or any other
responsible officer of the Commission and consent that the Division of
Investment Management may assist 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-1  Restated Articles of Incorporation of Ameren (incorporated
                    by reference to Annex F to the Registration Statement on
                    Form S-4 of Ameren in File No. 33-64165).

               A-2  Certificate of Amendment to the Restated Articles of
                    Incorporation of Ameren as filed with the Secretary of State
                    of the State of Missouri on December 14, 1998 (incorporated
                    by reference to Exhibit 3(i) to Ameren's Annual Report on
                    Form 10-K for the year ended December 31, 1998 in File No.
                    1-14756).


                                       13



               A-3  By-Laws of Ameren, as amended to December 31, 1997
                    (incorporated by reference to Exhibit 3(ii) to Ameren's
                    Annual Report on Form 10-K for the year ended December 31,
                    1997 in File No. 1-14756).

               B    None.

               C-1  Post-Effective Amendment No. 1 to Registration Statement of
                    Ameren on Form S-3, including Prospectus for Dividend
                    Reinvestment and Stock Purchase Plan, as filed June 15,
                    2000, in File No. 33-43721. (Incorporated herein by
                    reference).

               C-2  Registration Statement of Ameren on Form S-8, as filed April
                    23, 1998, in File No. 333-50793. (Incorporated herein by
                    reference).

               C-3  Registration Statement of Ameren on Form S-8, as filed
                    January 5, 1998, in File No. 333-43737. (Incorporated herein
                    by reference).

               C-4  Post-Effective Amendment No. 2 to Registration Statement of
                    Ameren on Form S-8, as filed December 16, 1999, in File No.
                    333-43743. (Incorporated herein by reference).

               D    Not applicable.

               E    Organizational chart. (Form SE).

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

               G    Proposed Form of Federal Register Notice.

               H    Ameren Corporation Long-term Incentive Plan of 1998.
                    (Incorporated by reference to Exhibit 10.1 to Ameren's
                    Annual Report on Form 10-K for the year ended December 31,
                    1998, in File No. 001-14756).


     B.   Financial Statements.
          --------------------

     FS-1   Ameren Consolidated Statements of     See Annual Report of Ameren on
            Income for the year ended             Form 10-K for the year ended
            December 31, 2000                     December 31, 2000 in File No.
                                                  1-14756

     FS-2   Ameren Consolidated Balance           See Annual Report of Ameren
            Sheets as of December 31, 2000        Form 10-K for the year ended
                                                  December 31, 2000 in File No.
                                                  1-14756


                                       14



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.


                                    SIGNATURE

     Pursuant to the requirements of the Public Utility Holding Company Act of
1935, the undersigned company has duly caused this Application/Declaration to be
signed on its behalf by the undersigned thereunto duly authorized.

                                        AMEREN CORPORATION


                                        By:/s/ Steven R. Sullivan
                                               ------------------
                                        Name:  Steven R. Sullivan
                                        Title: Senior Vice President,


Date:  April 4, 2001


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