AMEREN CORP
10-K405, 1998-03-30
METAL MINING
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<PAGE>   1
                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D. C. 20549
                                    FORM 10-K
                (X) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
              OF THE SECURITIES EXCHANGE ACT OF 1934 (FEE REQUIRED)

                   FOR THE FISCAL YEAR ENDED DECEMBER 31, 1997
                                       OR
          ( ) Transition report pursuant to Section 13 or 15(d) of the
                Securities Exchange Act of 1934 (No Fee Required)
                        For the transition period from       to

                         COMMISSION FILE NUMBER 1-14756

                               AMEREN CORPORATION
             (Exact name of registrant as specified in its charter)

           Missouri                                     43-1723446
(State or other jurisdiction                (I.R.S. Employer Identification No.)
of incorporation or organization)


                 1901 Chouteau Avenue, St. Louis, Missouri 63103
              (Address of principal executive offices and Zip Code)
       Registrant's telephone number, including area code: (314) 621-3222

           SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:
<TABLE>
<CAPTION>
Title of each class                    Name of each exchange on which registered
- -------------------                    -----------------------------------------
<S>                                            <C>
Common Stock, $ .01 par value                  New York Stock Exchange
</TABLE>


        SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT: NONE.

         Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes X . No .

         Indicate by check mark if disclosure of delinquent filers pursuant to
Item 405 of Regulation S-K is not contained herein, and will not be contained,
to the best of registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K. (X)

         Aggregate market value of voting stock held by non-affiliates as of
March 20, 1998, based on closing prices most recently available as reported in
The Wall Street Journal: $5,805,929,236.

         Shares of Common Stock, $5 par value, outstanding as of March 20, 1998:
137,215,462 shares.

                      DOCUMENTS INCORPORATED BY REFERENCES.

         Portions of the registrant's 1997 Annual Report to Stockholders (the
"1997 Annual Report") are incorporated by reference into Parts I, II and IV.

         Portions of the registrant's definitive proxy statement for the 1998
annual meeting are incorporated by reference into Part III.
<PAGE>   2
                                TABLE OF CONTENTS
<TABLE>
<CAPTION>
PART I                                                                                PAGE
- ------                                                                                ----
<S>                                                                                   <C>
Item     1  -  Business
                    General........................................................     1
                    Construction Program and Financing.............................     2
                    Rates..........................................................     2
                    Fuel Supply....................................................     3
                    Regulation.....................................................     3
                    Industry Issues................................................     5
                    Operating Statistics(1)........................................     5

Item     2  -  Properties..........................................................     5
Item     3  -  Legal Proceedings...................................................     6
Item     4  -  Submission of Matters to a Vote of Security Holders(2)

Executive Officers of the Registrant (Item 401(b) of Regulation S-K)...............     6

PART II

Item     5  -  Market for Registrant's Common Equity and Related
                    Stockholder Matters(1).........................................     7
Item     6  -  Selected Financial Data(1)..........................................     7
Item     7  -  Management's Discussion and Analysis of Financial Condition
                    and Results of Operations(1)...................................     7
Item     8  -  Financial Statements and Supplementary Data(1)......................     7
Item     9  -  Changes in and Disagreements with Accountants on Accounting
                    and Financial Disclosure(2)

PART III

Item   10   -  Directors and Executive Officers of the Registrant(1)...............     8
Item   11   -  Executive Compensation(1)...........................................     8
Item   12   -  Security Ownership of Certain Beneficial Owners
                    and Management(1)..............................................     8
Item   13   -  Certain Relationships and Related Transactions(1)...................     8

PART IV

Item   14   -  Exhibits, Financial Statement Schedules and Reports on Form 8-K.....     9

SIGNATURES  .......................................................................    12
EXHIBITS  .........................................................................    13
</TABLE>


- --------
(1) Incorporated herein by reference.

(2) Not applicable and not included herein.
<PAGE>   3
                                     PART I

ITEM     1.   BUSINESS.

               GENERAL. The Registrant, Ameren Corporation (the "Company"), was
incorporated in Missouri on August 7, 1995. On December 31, 1997, following the
receipt of all required approvals, CIPSCO Incorporated ("CIPSCO") and Union
Electric Company ("UE") combined with the result that the common shareholders of
CIPSCO and UE became the common shareholders of the Company, and the Company
became the owner of 100% of the common stock of CIPSCO's operating subsidiary,
Central Illinois Public Service Company ("CIPS") and UE. Pursuant to an
Agreement and Plan of Merger dated as of August 11, 1995 between (among others)
CIPSCO, UE, and the Company, each outstanding share of UE common stock has been
exchanged for one share of the Company's common stock and each outstanding share
of CIPSCO common stock has been exchanged for 1.03 shares of the Company's
common stock.

               For additional information about the merger, see "Overview" in
"Management's Discussion and Analysis" and Notes 1 and 2 to the "Notes to
Financial Statements" on Pages 18, 29, and 30, respectively, of the 1997 Annual
Report pages incorporated herein by reference.

               Ameren is a public utility holding company registered under the
Public Utility Holding Company Act of 1935 ("PUHCA") and does not own or operate
any significant assets other than the stock of its subsidiaries, including its
two operating subsidiaries, CIPS and UE. Dividends on Ameren's Common Stock are
dependent on distributions to be made to it by CIPS, UE, and its other
subsidiaries. The 1997 Annual Report Form 10-K's for CIPS and UE are available
from the Company upon request.

               CIPS is an Illinois corporation organized in 1902. It supplies
electric and gas service to territories in central and southern Illinois having
an estimated population of 820,000 within an area of approximately 20,000 square
miles. UE was incorporated in Missouri in 1922, and is successor to a number of
companies, the oldest of which was organized in 1881. It is the largest electric
utility in the State of Missouri and supplies electric and gas service in
territories in Missouri and Illinois having an estimated population of 2,600,000
within an area of approximately 24,500 square miles, including the greater St.
Louis area.

               The Company recorded an extraordinary charge to earnings in the
fourth quarter of 1997 for the write-off of generation-related regulatory assets
and liabilities of the Company's Illinois retail electric business as a result
of electric industry restructuring legislation enacted in Illinois in December
1997. The write-off reduced earnings $52 million, net of income taxes, or 38
cents per share (See Note 2 to the "Notes to Financial Statements " on Page 30
of the 1997 Annual Report pages incorporated herein by reference.)

               On a consolidated basis, 92.1% of the Company's 1997 operating
revenues was derived from the sale of electric energy, 7.5% came from the sale
of natural gas, and 0.4% came from other sources. Consolidated electric
operating revenues as a percentage of total operating revenues for the years
1995 and 1996 were 93% and 92%, respectively.

               The Company also owns all of the common stock of other subsidiary
companies as follows: (a) CIPSCO Investment Company, a non-regulated investment
company incorporated in Illinois; (b) Ameren Services Company, a Missouri
corporation which provides administrative, accounting, legal, engineering,
executive, and other support services to Ameren affiliates; (c) Ameren Energy,
Inc., a Missouri corporation which will provide power marketing, risk management
and energy services; and (d) Ameren Development Company, a non-regulated holding
company incorporated in Missouri. In addition, through its operating
subsidiaries, the Company owns 60% of

                                      - 1 -
<PAGE>   4
the Common Stock of Electric Energy, Inc., which owns and operates a generating
plant with a nominal capacity of 1,000 mW. 60% of the plant's output is
committed to the Department of Energy, 10% to UE, 5% to CIPS, and the remainder
to its other owners.

               At December 31, 1997, the Company and its subsidiaries had 8,149
employees.

               CONSTRUCTION PROGRAM AND FINANCING. The Company is engaged in a
construction program under which expenditures averaging approximately $333
million are anticipated during each of the next five years. Capital expenditures
for compliance with the Clean Air Act Amendments of 1990 are included in the
construction program but the estimate does not include expenditures which may be
incurred to meet new air quality standards -- also see "Regulation", below. The
Company does not anticipate a need for additional base load electric generating
capacity until after the year 2013.

               In addition to the funds required for construction during the
1998-2002 period, $488 million will be required to repay long-term debt as
follows: $52 million in 1998; $209 million in 1999; $49 million in 2000; $44
million in 2001; and $134 million in 2002. Amounts for years subsequent to 1998
do not include UE's nuclear fuel lease payments since the amounts of such
payments are not currently determinable.

               Financing. Historically, CIPS and UE have financed those
construction costs which exceeded available internally generated funds through
issuance of short-term debt in the form of bank loans and commercial paper. As
needed, the short-term debt would be subsequently reduced by sales of long-term
debt and equity securities.

               To issue first mortgage bonds and preferred stock, CIPS and UE
each must comply with earnings tests contained in their respective mortgages and
Articles. For the issuance of additional first mortgage bonds, generally,
earnings coverage of twice the annual interest charges on first mortgage bonds
outstanding and to be issued is required. Generally, for the issuance of
additional preferred stock, earnings coverage of one and one-half times annual
interest charges and preferred stock dividends is required under the CIPS
Articles, and earnings coverage of at least two and one-half times the annual
dividend on preferred stock outstanding and to be issued is required under UE's
Articles. The ability to issue such securities in the future will depend on
coverages at that time. Currently, each company expects to have adequate
coverage ratios for anticipated requirements.

               For additional information on the Company's financial needs, see
"Liquidity and Capital Resources" in "Management's Discussion and Analysis" on
Page 20, and Notes 5, 6, and 10 to the "Notes to Financial Statements" on Pages
34 and 40, of the 1997 Annual Report pages incorporated herein by reference.

               RATES. For the year 1997, approximately 60%, 22%, and 18% of the
Company's electric operating revenues were based on rates regulated by the
Missouri Public Service Commission ("MoPSC"), the Illinois Commerce Commission
("ICC"), and the Federal Energy Regulatory Commission ("FERC") of the U. S.
Department of Energy, respectively.

               As permitted by electric utility restructuring legislation in
Illinois, CIPS and UE have elected to eliminate the fuel adjustment clause on
sales of electricity in Illinois, thereby including a historical level of fuel
costs in base rates. The CIPS request has been approved by the ICC, and a
decision on the UE request is expected by early May, 1998.


                                      - 2 -
<PAGE>   5
               For additional information on "Rates", see Note 2 to the "Notes
to Financial Statements" on Page 30 of the 1997 Annual Report pages incorporated
herein by reference.

               FUEL SUPPLY.
<TABLE>
<CAPTION>
COST OF FUELS                                                                YEAR
- -------------                                  -------------------------------------------------------------------
                                               1997            1996            1995          1994             1993
                                               ----            ----            ----          ----             ----
<S>                                        <C>             <C>             <C>             <C>              <C>
UE
Per Million BTU       - Coal               105.600(cent)   112.250(cent)   117.645(cent)   123.950(cent)    153.284(cent)
                      - Nuclear             47.472(cent)    47.499(cent)    48.592(cent)    49.932(cent)     56.848(cent)
                      - System              92.816(cent)    96.596(cent)   101.590(cent)   101.867(cent)    126.362(cent)

CIPS
Per Million BTU       - System (Coal)      163.000(cent)   171.000(cent)   176.000(cent)   165.000(cent)    167.000(cent)
</TABLE>

               Nuclear. UE has agreements to fulfill its Callaway Nuclear Plant
needs for uranium, enrichment, and fabrication services through 2002, and
agreements for conversion services are sufficient to supply the Plant through
1999. Additional contracts will have to be entered into in order to supply
nuclear fuel during the remainder of the life of the Plant, at prices which
cannot now be accurately predicted. The Callaway Plant normally requires
re-fueling at 18-month intervals and re-fuelings are presently scheduled for the
spring of 1998 and the fall of 1999. Under the Nuclear Waste Policy Act of 1982,
the U. S. Department of Energy is responsible for the permanent storage and
disposal of spent nuclear fuel. DOE currently charges one mill per nuclear
generated kilowatt-hour sold for future disposal of spent fuel. Electric rates
charged to customers provide for recovery of such costs. DOE is not expected to
have its permanent storage facility for spent fuel available until at least
2015. UE has sufficient storage capacity at the Callaway Plant site until 2004
and is pursuing a viable storage alternative. This alternative will require
Nuclear Regulatory Commission approval. The delayed availability of DOE's
disposal facility is not expected to adversely affect the continued operation of
the Callaway Plant.

               For additional information on the Company's "Fuel Supply", see
Note 10 to the "Notes to Financial Statements" on Page 40 of the 1997 Annual
Report pages incorporated herein by reference.

               REGULATION. As a holding company registered under the PUHCA,
Ameren, along with its subsidiaries, is subject to the regulatory provisions
of said Act, including provisions relating to the issuance of securities, sales
and acquisitions of securities and utility assets, the services performed by
Ameren Services Company, and the activities of certain other subsidiaries.

               CIPS and UE are subject to regulation, as applicable, by the
MoPSC and the ICC as to rates, service, accounts, issuance of equity securities,
issuance of debt having a maturity of more than twelve months, mergers, and
various other matters. Said companies are also subject to regulation by the FERC
as to rates and charges in connection with the transmission of electric energy
in interstate commerce and the sale of such energy at wholesale in interstate
commerce, mergers, and certain other matters. Authorization to issue debt having
a maturity of twelve months or less is obtained from the Securities and Exchange
Commission.

               In December 1997, the Governor of Illinois signed the Electric
Service Customer Choice and Rate Relief Law of 1997 providing for electric
utility restructuring in Illinois. This legislation introduces competition into
the supply of electric energy in Illinois and, as a result, prices for the
retail supply of electric generation are expected to transition from cost-based,

                                      - 3 -
<PAGE>   6
regulated rates to rates determined in large part by competitive market forces.
For a discussion of the legislation, see Note 2 to the "Notes to Financial
Statements" on Page 30 of the 1997 Annual Report pages incorporated herein by
reference.

               Operation of UE's Callaway Plant is subject to regulation by the
Nuclear Regulatory Commission. Its Facility Operating License for the Callaway
Plant expires on October 18, 2024. UE's Osage hydroelectric plant and its Taum
Sauk pumped-storage hydro plant, as licensed projects under the Federal Power
Act, are subject to FERC regulations affecting, among other things, the general
operation and maintenance of the projects. The license for the Osage Plant
expires on February 28, 2006, and the license for the Taum Sauk Plant expires on
June 30, 2010. UE's Keokuk Plant and dam located in the Mississippi River
between Hamilton, Illinois and Keokuk, Iowa, are operated under authority,
unlimited in time, granted by an Act of Congress in 1905.

               CIPS and UE are regulated, in certain of their operations, by air
and water pollution and hazardous waste regulations at the city, county, state
and federal levels.

               National Ambient Air Quality Standards. In July 1997, the United
States Environmental Protection Agency ("EPA") issued final regulations revising
the National Ambient Air Quality Standards for ozone and particulate matter.
Although specific emission control requirements are still being developed, it is
believed that the revised standards will require significant additional
reductions in nitrogen oxide and sulfur dioxide emissions from coal-fired
boilers. In October 1997, the EPA announced that Missouri and Illinois are
included in the area targeted for nitrogen oxide emissions reductions as part of
the EPA's regional control program. Reduction requirements in nitrogen oxide
emissions from UE's and CIPS' coal-fired boilers could exceed 80% from 1990
levels by the year 2002. Reduction requirements in sulfur dioxide emissions may
be up to 50% beyond that already required by Phase II acid rain control
provisions of the 1990 Clean Air Act Amendments and could be required by 2007.
Because of the magnitude of these additional reductions, the Company could be
required to incur significantly higher capital costs to meet future compliance
obligations for the coal-fired boilers or purchase power from other sources,
either of which could have significantly higher operations and maintenance
expenditures associated with compliance. At this time, the Company is unable to
determine the impact of the revised air quality standards on its future
financial condition, results of operations or liquidity.

               In December 1997, the United States and numerous other countries
agreed to certain environmental provisions (the Kyoto Protocol), which would
require decreases in greenhouse gases in an effort to address the "global
warming" issue. The Company is unable to predict what requirements, if any, will
be adopted in this country. However, implementation of the Kyoto Protocol in its
present form would likely result in significantly higher capital costs and
operations and maintenance expenditures by the Company. At this time, the
Company is unable to determine the impact of these proposals on its future
financial condition, results of operations or liquidity.

               For additional discussion of environmental matters, see Note 10
to the "Notes to Financial Statements" on Page 40 of the 1997 Annual Report
pages incorporated by reference.

               Other aspects of the Company's business are subject to the
jurisdiction of various regulatory authorities and, for additional information
on "Regulation", see Note 2 to the "Notes to Financial Statements" on Page 30 of
the 1997 Annual Report pages incorporated herein by reference.

               INDUSTRY ISSUES.  The Company is facing issues common to the
electric and gas utility industries which have emerged during the past several
years. These issues include: the potential for more intense competition and for
changing the structure of regulation; changes in the

                                      - 4 -
<PAGE>   7
structure of the industry as a result of changes in federal and state laws;
on-going consideration of additional changes of the industry by federal and
state authorities; continually developing environmental laws, regulations and
issues including proposed new air quality standards; public concern about the
siting of new facilities; proposals for demand side management programs; public
concerns about nuclear decommissioning and the disposal of nuclear wastes; and
global climate issues. The Company is monitoring these issues and is unable to
predict at this time what impact, if any, these issues will have on its
operations, financial condition, or liquidity.

               Also see "Outlook" in "Management's Discussion and Analysis" and
Note 10 to the "Notes to Financial Statements" on Pages 22 and 40, respectively,
of the Annual Report pages incorporated herein by reference.

               OPERATING STATISTICS. The information on Pages 46 and 47 in the
Company's 1997 Annual Report is incorporated herein by reference.

ITEM     2.   PROPERTIES.

            The following table sets forth information with respect to the
Company's generating facilities and capability at the time of the expected 1998
peak.
<TABLE>
<CAPTION>
                                                                                      GROSS KILOWATT
             ENERGY                                                                    INSTALLED
             SOURCE              PLANT                    LOCATION                     CAPABILITY
             ------              -----                    --------                     ----------
<S>                            <C>                  <C>                                   <C>
             Coal              Labadie              Franklin County, Mo.                   2,404,000
                               Rush Island          Jefferson County, Mo.                  1,214,000
                               Newton               Newton, Ill.                           1,110,000
                               Sioux                St. Charles County, Mo.                1,008,000
                               Meramec              St. Louis County, Mo.                    927,000
                               Coffeen              Coffeen, Ill.                            900,000
                               Meredosia            Meredosia, Ill.                          339,000
                               Grand Tower          Grand Tower, Ill.                        186,000
                               Hutsonville          Hutsonville, Ill.                        153,000
                                                                                          ----------

                                                               Total Coal                  8,241,000

             Nuclear           Callaway             Callaway County, Mo.                   1,199,000

             Hydro             Osage                Lakeside, Mo.                            212,000
                               Keokuk               Keokuk, Ia.                              126,000
                                                                                          ----------

                                                               Total Hydro                   338,000

             Oil and           Venice               Venice, Ill.                             459,000
             Natural Gas       Other                Various                                  554,000
                                                                                          ----------
                                                               Total Oil and
                                                                  Natural Gas              1,013,000
             Pumped-
             storage           Taum Sauk            Reynolds County, Mo.                     350,000
                                                                                          ----------

                                                               TOTAL                      11,141,000
                                                                                          ==========
</TABLE>

                                      - 5 -
<PAGE>   8
               As of December 31, 1997, CIPS owned approximately 4,800 circuit
miles of electric transmission lines and substations with a transformer capacity
of approximately 19,450,000 kVA. CIPS operates one propane-air plant and  4,800
miles of gas mains. As of that date, UE owned approximately 3,304 circuit miles
of electric transmission lines and substations with a transformer capacity of
approximately 45,497,000 kVA. UE operates three propane-air plants and 2,737
miles of gas mains. Other properties of the companies include distribution
lines, underground cable, and office buildings, warehouses, garages and repair
shops.

               Substantially all of the properties and plant of CIPS and UE are
subject to the direct first liens of the indentures securing their first
mortgage bonds.


ITEM      3.  LEGAL PROCEEDINGS.

            The Company is involved in legal and administrative proceedings
before various courts and agencies with respect to matters arising in the
ordinary course of business, some of which involve substantial amounts.
Management believes that the final disposition of these proceedings will not
have a material adverse effect on its financial position, results of operations
or liquidity.



            Statements made in this report which are not based on historical
facts, are forward-looking and, accordingly, involve risks and uncertainties
that could cause actual results to differ materially from those discussed.
Although such forward-looking statements have been made in good faith and are
based on reasonable assumptions, there is no assurance that the expected results
will be achieved. These statements include (without limitation) statements as to
future expectations, beliefs, plans, strategies, objectives, events, conditions
and financial performance. In connection with the "Safe Harbor" provisions of
the Private Securities Litigation Reform Act of 1995, the Company is providing
this cautionary statement to identify important factors that could cause actual
results to differ materially from those anticipated. Factors include, but are
not limited to, the effects of: regulatory actions; changes in laws and other
governmental actions; competition; future market prices for electricity; average
rates for electricity in the Midwest; business and economic conditions; weather
conditions; fuel prices and availability; generation plant performance; monetary
and fiscal policies; and legal and administrative proceedings.


INFORMATION REGARDING EXECUTIVE OFFICERS REQUIRED BY ITEM 401(b) OF
REGULATION S-K:
<TABLE>
<CAPTION>
                                                                                DATE FIRST ELECTED
                            AGE AT                                               OR APPOINTED TO
       NAME                12/31/97        PRESENT POSITION                      PRESENT POSITION
       ----                --------        ----------------                      ----------------
<S>                          <C>           <C>                                       <C>
Charles W. Mueller           59            Chairman, President and
                                           Chief Executive Officer,
                                           and Director                              12/31/97
Donald E. Brandt             43            Senior Vice President                     12/31/97
William E. Jaudes            60            Vice President and
                                           General Counsel                           12/31/97
Warner L. Baxter             36            Controller                                12/31/97
James C. Thompson            58            Secretary                                 12/31/97
Jerre E. Birdsong            43            Treasurer                                  4/23/96
</TABLE>


                                     - 6 -
<PAGE>   9
            All officers are elected or appointed annually by the Board of
Directors following the election of such Board at the annual meeting of
stockholders held in April. There are no family relationships between the
foregoing officers of the Company. Except for Mr. Baxter, each of the
above-named executive officers has been employed by the Company or its
affiliates for more than five years in executive or management positions. Mr.
Baxter was previously employed by Price Waterhouse LLP.


                                     PART II

ITEM     5.   MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED
              STOCKHOLDER MATTERS.

         Information required to be reported by this item is included on Page 49
of the 1997 Annual Report and is incorporated herein by reference.


ITEM     6.   SELECTED FINANCIAL DATA.

         Information for the 1993-1997 period required to be reported by this
item is included on Page 45 of the 1997 Annual Report and is incorporated herein
by reference.


ITEM     7.   MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
              CONDITION AND RESULTS OF OPERATIONS.

         Information required to be reported by this item is included on Pages
18 through 23 of the 1997 Annual Report and is incorporated herein by reference.

ITEM     8.   FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA.

         The financial statements of the Company on Pages 24 through 44, the
report thereon of Price Waterhouse LLP appearing on Page 17 and the Selected
Quarterly Information on Page 28 of the 1997 Annual Report are incorporated
herein by reference.

                                      - 7 -
<PAGE>   10
                                    PART III

ITEM     10.   DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT.

         Any information concerning directors required to be reported by this
item is included under "Item (1): Election of Directors" in the Company's 1998
definitive proxy statement filed pursuant to Regulation 14A and is incorporated
herein by reference.

         Information concerning executive officers required by this item is
reported in Part I of this Form 10-K.


ITEM     11.   EXECUTIVE COMPENSATION.

         Any information required to be reported by this item is included under
"Compensation" in the Company's 1998 definitive proxy statement filed pursuant
to Regulation 14A and is incorporated herein by reference.


ITEM     12.   SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND
               MANAGEMENT.

         Any information required to be reported by this item is included under
"Security Ownership of Management" in the Company's 1998 definitive proxy
statement filed pursuant to Regulation 14A and is incorporated herein by
reference.


ITEM     13.   CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS.

         Any information required to be reported by this item is included under
"Item (1): Election of Directors" in the Company's 1998 definitive proxy
statement filed pursuant to Regulation 14A and is incorporated herein by
reference.

                                      - 8 -
<PAGE>   11
                                     PART IV

ITEM 14.      EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K.

         (a) The following documents are filed as a part of this report:

         1.   Financial Statements: *
<TABLE>
<CAPTION>
                                                                                                           Page From 1997
                                                                                                           Annual Report
                                                                                                           -------------
<S>                                                                                                             <C>
              Consolidated Report of Independent Accountants.........................................           17
              Consolidated Balance Sheet - December 31, 1997 and 1996................................           24
              Consolidated Statement of Income - Years 1997, 1996, and 1995..........................           26
              Consolidated Statement of Cash Flows - Years 1997, 1996, and 1995......................           27
              Consolidated Statement of Retained Earnings
                - Years 1997, 1996, and 1995.........................................................           28
              Notes to Consolidated Financial Statements.............................................           29
</TABLE>

              *Incorporated by reference from the indicated pages of the 1997
              Annual Report

         2.   Financial Statement Schedule:

              The following schedule, for the years ended December 31, 1997,
              1996, and 1995, should be read in conjunction with the
              aforementioned financial statements (schedules not included have
              been omitted because they are not applicable or the required data
              is shown in the aforementioned financial statements).
<TABLE>
<CAPTION>
                                                                                                           Pages Herein
                                                                                                           ------------
<S>                                                                                                             <C>
              Report of Independent Accountants on Financial
                 Statement Schedule..................................................................           10

              Valuation and Qualifying Accounts (Schedule II)........................................           11
</TABLE>

         3.   Exhibits: See EXHIBITS beginning on Page 13

         (b)  Reports on Form 8-K. During the last quarter of 1997, the Company
              filed a report on Form 8-K dated December 31, 1997 reporting
              completion of the merger transaction between CIPSCO and UE.


                                      - 9 -
<PAGE>   12
                           REPORT OF INDEPENDENT ACCOUNTANTS
                            ON FINANCIAL STATEMENT SCHEDULE





To the Board of Directors
of Ameren Corporation


Our audits of the financial statements referred to in our report dated February
5, 1998 appearing in the 1997 Annual Report to Shareholders of Ameren
Corporation (which report and financial statements are incorporated by reference
in this Annual Report on Form 10-K) also included an audit of the Financial
Statement Schedule listed in Item 14(a)(2) of this Form 10-K. In our opinion,
this Financial Statement Schedule presents fairly, in all material respects, the
information set forth therein when read in conjunction with the related
financial statements.



/s/ PRICE WATERHOUSE LLP

PRICE WATERHOUSE LLP
St. Louis, Missouri
February 5, 1998

                                     - 10 -
<PAGE>   13


                               AMEREN CORPORATION
                 SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
              FOR THE YEARS ENDED DECEMBER 31, 1997, 1996 AND 1995



<TABLE>
<CAPTION>
                  Col. A.                         Col. B                    Col. C                   Col. D.              Col. E
                  -------                         ------                    ------                   -------              ------
                                                                           Additions
                                                                ---------------------------
                                                                    (1)               (2)
                                                Balance at     Charged to                                              Balance at
                                                 beginning      costs and         Charged to                              end of
                  Description                    of period      expenses       other accounts     Deductions              period
                  -----------                   -----------    ----------      --------------     ----------           ---------
Year ended December 31, 1997                                                                       (Note)
<S>                                            <C>             <C>                <C>              <C>                <C>
Reserves deducted in the balance sheet
 from assets to which they apply:

      Allowance for doubtful accounts          $5,795,332      $12,648,812        $    -           $13,598,816        $4,845,328
                                               ==========      ===========        ===========      ===========        ==========

Year ended December 31, 1996

Reserves deducted in the balance sheet
 from assets to which they apply:

      Allowance for doubtful accounts          $7,524,965      $12,100,000        $    -           $13,829,633        $5,795,332
                                               ==========      ===========        ===========      ===========        ==========

Year ended December 31, 1995

Reserves deducted in the balance sheet
 from assets to which they apply:

      Allowance for doubtful accounts          $6,877,378      $10,800,000        $    -           $10,152,413        $7,524,965
                                               ==========      ===========        ===========      ===========        ==========
</TABLE>


Note:  Uncollectible accounts charged off, less recoveries.


                                                      - 11 -

<PAGE>   14
                                   SIGNATURES

            Pursuant to the requirements of Section 13 or 15(d) of the
Securities Exchange Act of 1934, the registrant has duly caused this report to
be signed on its behalf by the undersigned, thereunto duly authorized.

                                   AMEREN CORPORATION
                                      (Registrant)

                                   CHARLES W. MUELLER
                                   Chairman, President and
                                   Chief Executive Officer

Date    March 30, 1998             By    /s/ James C. Thompson
     -----------------------          ---------------------------------------
                                        (James C. Thompson, Attorney-in-Fact)

            Pursuant to the requirements of the Securities Exchange Act of 1934,
this report has been signed below by the following persons on behalf of the
registrant and in the capacities and on the date indicated.
<TABLE>
<CAPTION>
     SIGNATURE                                           TITLE
     ---------                                           -----
<S>                                       <C>
/s/ C. W. Mueller                                    Chairman, President, Chief
- --------------------------------                 Executive Officer and Director
CHARLES W. MUELLER                                (Principal Executive Officer)
                                                        

/s/ Donald E. Brandt                                      Senior Vice President
- --------------------------------    (Principal Financial and Accounting Officer)
DONALD E. BRANDT                          


/s/ W. E. Cornelius
- -------------------------------------
WILLIAM E. CORNELIUS, Director


/s/ Clifford L. Greenwalt
- -------------------------------------
CLIFFORD L. GREENWALT, Director

- -------------------------------------
THOMAS A. HAYS, Director


/s/ Richard A. Liddy
- -------------------------------------
RICHARD A. LIDDY, Director


/s/ Gordon R. Lohman
- -------------------------------------
GORDON R. LOHMAN, Director


/s/ Richard A. Lumpkin
- -------------------------------------
RICHARD A. LUMPKIN, Director


- -------------------------------------
JOHN PETERS MacCARTHY, Director


/s/ Hanne M. Merriman
- -------------------------------------
HANNE M. MERRIMAN, Director

/s/ Paul L. Miller, Jr.
- -------------------------------------
PAUL L. MILLER, JR., Director

/s/ Robert H. Quenon
- -------------------------------------
ROBERT H. QUENON, Director

/s/ Harvey Saligman
- -------------------------------------
HARVEY SALIGMAN, Director

/s/ Charles J. Schukai
- -------------------------------------
CHARLES J. SCHUKAI, Director

/s/ Janet McAfee Weakley
- -------------------------------------
JANET McAFEE WEAKLEY, Director

/s/ James W. Wogsland
- -------------------------------------
JAMES W. WOGSLAND, Director


    By    /s/ James C. Thompson                          March 30, 1998
          -------------------------------------
           (James C. Thompson, Attorney-in-Fact)

</TABLE>
                                     - 12 -
<PAGE>   15
                                    EXHIBITS

                             EXHIBITS FILED HEREWITH
<TABLE>
<CAPTION>
  EXHIBIT NO.                     DESCRIPTION
  -----------                     -----------

<S>               <C>
      3(ii)       - By-Laws of the Company as amended effective December 31, 1997.

      13          - Those pages of the 1997 Annual Report incorporated herein by reference.

      21          - Subsidiaries of the Company.

      23          - Consent of Independent Accountants.

      24          - Powers of Attorney.

      27          - Financial Data Schedule.
</TABLE>



                       EXHIBITS INCORPORATED BY REFERENCE

            The following exhibits heretofore have been filed with the
Securities and Exchange Commission pursuant to requirements of the Acts
administered by the Commission. Such exhibits are identified by the references
following the listing of each such exhibit, and they are hereby incorporated
herein by reference.

<TABLE>
<CAPTION>
  EXHIBIT NO.                              DESCRIPTION
  -----------                              -----------
<S>               <C>

      2           - Agreement and Plan of Merger, dated as of August 11, 1995, by and among the
                    Company, CIPSCO Incorporated, UE, and Arch Merger Inc. (June 30, 1995 Form
                    10-Q/A (Amendment No. 1), Exhibit 2(a).)

      3(i)        - Restated Articles of Incorporation of the Company. (Registration No. 33-64165,
                    Annex F.)
</TABLE>





                                                     - 13 -


<PAGE>   1
                               AMEREN CORPORATION                  EXHIBIT 3(ii)



                                   ----------


                                  B Y - L A W S

                     AS AMENDED EFFECTIVE DECEMBER 31, 1997



                                   ----------



                                    ARTICLE I

                                  STOCKHOLDERS

            Section 1. The annual meeting of the stockholders of the Company
shall be held on the fourth Tuesday of April in each year (or if said day be a
legal holiday, then on the next succeeding day not a legal holiday), at the
registered office of the Company in the City of St. Louis, State of Missouri, or
on such other date and at such other place within or without the state of
Missouri as may be stated in the notice of meeting, for the purpose of electing
directors and of transacting such other business as may properly be brought
before the meeting.

            Section 2. Special meetings of the stockholders may be called only
by the Chief Executive Officer or, if one has not been appointed, by the
President, or by the Board of Directors pursuant to a resolution adopted by a
majority of the total number of directors which the Company would have if there
were no vacancies.

            Section 3. Written or printed notice of each meeting of stockholders
stating the place, day and hour of the meeting and, in case of a special
meeting, the purpose or purposes for which the meeting is called, shall be
delivered or given not less than ten nor more than seventy days before the date
of the meeting, either personally or by mail, to each stockholder of record
entitled to vote thereat, at his address as it appears, if at all, on the
records of the Company. Such further notice shall be given by mail, publication
or otherwise as may be required by law. Meetings may be held without notice if
all the stockholders entitled to vote thereat are present or represented at the
meeting, or if notice is waived by those not present or represented.

            Section 4. The holders of record of a majority of the shares of the
capital stock of the Company issued and outstanding, entitled to vote thereat,
present in person or represented by proxy, shall, except as otherwise provided
by law, constitute a quorum at all meetings of the stockholders. If at any
meeting there be no such quorum, such holders of a majority of the shares so
present or represented may successively adjourn the meeting to a specified date
not longer than ninety days after such adjournment, without notice other than
announcement at the meeting, until such quorum shall
<PAGE>   2
have been obtained, when any business may be transacted which might have been
transacted at the meeting as originally notified. The chairman of the meeting or
a majority of shares so represented may adjourn the meeting from time to time,
whether or not there is such a quorum.

            Section 5. Meetings of the stockholders shall be presided over by
the Chief Executive Officer or, if he is not present, or if one has not been
appointed, by the Chairman of the Board of Directors or by the President or, if
neither the Chairman nor the President is present, by such other officer of the
Company as shall be selected for such purpose by the Board of Directors. The
Secretary of the Company or, if he is not present, an Assistant Secretary of the
Company or, if neither the Secretary nor an Assistant Secretary is present, a
secretary pro tem to be designated by the presiding officer shall act as
secretary of the meeting.

            Section 6. At all meetings of the stockholders every holder of
record of the shares of the capital stock of the Company, entitled to vote
thereat, may vote either in person or by proxy.

            Section 7. At all elections for directors the voting shall be by
written ballot. If the object of any meeting be to elect directors or to take a
vote of the stockholders on any proposition of which notice shall have been
given in the notice of the meeting, the person presiding at such meeting shall
appoint not less than two persons, who are not directors, inspectors to receive
and canvass the votes given at such meeting. Any inspector, before he shall
enter on the duties of his office, shall take and subscribe an oath, in the
manner provided by law, that he will execute the duties of inspector at such
meeting with strict impartiality and according to the best of his ability. The
inspectors shall take charge of the polls and after the balloting shall make a
certificate of the result of the vote taken.

            Section 8. (a) (1) Nominations of persons for election to the Board
of Directors of the Company and the proposal of business to be considered by the
stockholders may be made at an annual meeting of stockholders (i) pursuant to
the Company's notice of meeting, (ii) by or at the direction of the Board of
Directors or (iii) by any stockholder of the Company who was a stockholder of
record at the time of giving of notice provided for in this By-Law, who is
entitled to vote at the meeting and who complies with the notice procedures set
forth in this By-Law.

            (2) For nominations or other business to be properly brought before
an annual meeting by a stockholder pursuant to clause (iii) of paragraph (a)(1)
of this By-Law, the stockholder must have given timely notice thereof in writing
to the Secretary of the Company and such other business must otherwise be a
proper matter for stockholder action. To be timely, a stockholder's notice shall
be delivered to the Secretary at the principal executive offices of the Company
not later than the close of business on the 60th day nor earlier than the close
of business on the 90th day prior to the first anniversary of the preceding
year's annual meeting; provided, however, that in the event that the date of the
annual meeting is more than 30 days before or more than 60 days after such
anniversary date, notice by the stockholder to be timely must be so delivered
not earlier than the close of business on the 90th day prior to such annual
meeting and not later than the close of business on the later of the 60th day
prior to such annual meeting or the 10th day following the day on which public
announcement of the date of such meeting is first made by the Company. In no
event shall the public announcement of an adjournment of an annual meeting
commence a new time period for the giving of a stockholder's notice as described
above. Such stockholder's notice shall set forth (a) as to each person whom the
stockholder proposes to nominate for election or re-election as a director, all

                                        2
<PAGE>   3
information relating to such person that is required to be disclosed in
solicitations of proxies for election of directors in an election contest, or is
otherwise required, in each case pursuant to Regulation 14A under the Securities
Exchange Act of 1934, as amended (the "Exchange Act") and Rule 14a-11 thereunder
(including such person's written consent to being named in the proxy statement
as a nominee and to serving as a director if elected); (b) as to any other
business that the stockholder proposes to bring before the meeting, a brief
description of the business desired to be brought before the meeting, the
reasons for conducting such business at the meeting and any material interest in
such business of such stockholder and the beneficial owner, if any, on whose
behalf the proposal is made; and (c) as to the stockholder giving the notice and
the beneficial owner, if any, on whose behalf the nomination or proposal is made
(i) the name and address of such stockholder, as they appear on the Company's
books, and of such beneficial owner and (ii) the class and number of shares of
the Company which are owned beneficially and of record by such stockholder and
such beneficial owner.

            (3) Notwithstanding anything in the second sentence of paragraph
(a)(2) of this By-Law to the contrary, in the event that the number of directors
to be elected to the Board of Directors of the Company is increased and there is
no public announcement by the Company naming all of the nominees for director or
specifying the size of the increased Board of Directors at least 70 days prior
to the first anniversary of the preceding year's annual meeting, a stockholder's
notice required by this By-Law shall also be considered timely, but only with
respect to nominees for any new positions created by such increase, if it shall
be delivered to the Secretary at the principal executive offices of the Company
not later than the close of business on the 10th day following the day on which
such public announcement is first made by the Company.

            (b) Only such business shall be conducted at a special meeting of
stockholders as shall have been brought before the meeting pursuant to the
Company's notice of meeting. Nominations of persons for election to the Board of
Directors may be made at a special meeting of stockholders at which directors
are to be elected pursuant to the Company's notice of meeting (1) by or at the
direction of the Board of Directors or (2) provided that the Board of Directors
has determined that directors shall be elected at such meeting, by any
stockholder of the Company who is a stockholder of record at the time of giving
of notice provided for in this By-Law, who shall be entitled to vote at the
meeting and who complies with the notice procedures set forth in this By-Law. In
the event the Company calls a special meeting of stockholders for the purpose of
electing one or more directors to the Board of Directors, any such stockholder
may nominate a person or persons (as the case may be), for election to such
position(s) as specified in the Company's notice of meeting, if the
stockholder's notice required by paragraph (a)(2) of this By-Law shall be
delivered to the Secretary at the principal executive offices of the Company not
earlier than the close of business on the 90th day prior to such special meeting
and not later than the close of business on the later of the 60th day prior to
such special meeting or the 10th day following the day on which public
announcement is first made of the date of the special meeting and of the
nominees proposed by the Board of Directors to be elected at such meeting. In no
event shall the public announcement of an adjournment of a special meeting
commence a new time period for the giving of a stockholder's notice as described
above.

            (c) (1) Only such persons who are nominated in accordance with the
procedures set forth in this By-Law shall be eligible to serve as directors and
only such business shall be conducted at a meeting of stockholders as shall have
been brought before the meeting in accordance with the

                                        3
<PAGE>   4
procedures set forth in this By-Law. Except as otherwise provided by law, the
Articles of Incorporation of the Company (such articles, as they may be amended
and/or restated from time to time being referred to herein as the "Articles of
Incorporation") or these By-Laws, the chairman of the meeting shall have the
power and duty to determine whether a nomination or any business proposed to be
brought before the meeting was made or proposed, as the case may be, in
accordance with the procedures set forth in this By-Law and, if any proposed
nomination or business is not in compliance with this By-Law, to declare that
such defective proposal or nomination shall be disregarded.

            (2) For purposes of this By-Law, "public announcement" shall mean
disclosure in a press release reported by the Dow Jones News Service, Associated
Press or comparable national news service or in a document publicly filed by the
Company with the Securities and Exchange Commission pursuant to Section 13, 14
or 15(d) of the Exchange Act.

            (3) Notwithstanding the foregoing provisions of this By-Law, a
stockholder shall also comply with all applicable requirements of the Exchange
Act and the rules and regulations thereunder with respect to the matters set
forth in this By-Law. Nothing in this By-Law shall be deemed to affect any
rights (A) of stockholders to request inclusion of proposals in the Company's
proxy statement pursuant to Rule 14a-8 under the Exchange Act or (B) of the
holders of any series of Preferred Stock to elect directors under specified
circumstances.


                                   ARTICLE II

                                    Directors

            Section 1. The property and business of the Company shall be
controlled and managed by its Board of Directors. The number of directors to
constitute the Board of Directors shall be fifteen; provided, however, that such
number may be fixed by the Board of Directors, from time to time, at not less
than a minimum of three nor more than a maximum of twenty-one (21) (subject to
the rights of the holders of shares of Preferred Stock, if any, as set forth in
the Articles of Incorporation). Except as otherwise provided in the Articles of
Incorporation, the directors shall hold office until the next annual election
and until their successors shall be elected and qualified. A majority of the
members of the Board of Directors shall constitute a quorum for the transaction
of business, but if at any meeting of the Board there shall be less than a
quorum present, a majority of the directors present may adjourn the meeting from
time to time, without notice other than announcement at the meeting, until such
quorum shall have been obtained, when any business may be transacted which might
have been transacted at the original meeting had a quorum been present.

            Section 2. Vacancies in the Board of Directors, including vacancies
created by newly created directorships, shall be filled in the manner provided
in the Articles of Incorporation, and, except as otherwise provided therein, the
directors so elected shall hold office until their successors shall be elected
and qualified.

            Section 3. Meetings of the Board of Directors shall be held at such
time and place within or without the State of Missouri as may from time to time
be fixed by resolution of the Board, or as

                                        4
<PAGE>   5
may be stated in the notice of any meeting. Regular meetings of the Board shall
be held at such time as may from time to time be fixed by resolution of the
Board, and notice of such meetings need not be given. Special meetings of the
Board may be held at any time upon call of the Chief Executive Officer or, if
one has not been appointed, by the President, or by the Executive Committee, if
one shall have been appointed, by oral, telephonic (including via telecopier) or
written notice, duly given or sent or mailed to each director not less than two
(2) days before any such meeting. The notice of any meeting of the Board need
not specify the purposes thereof except as may be otherwise required by law.
Meetings may be held at any time without notice if all of the directors are
present or if those not present waive notice of the meeting, in writing.

            Section 4. The Board of Directors, by the affirmative vote of a
majority of the whole Board may appoint an Executive Committee, to consist of
two or more directors as the Board may from time to time determine. The
Executive Committee shall have and may exercise to the extent permitted by law,
when the Board is not in session, all of the powers vested in the Board, except
the power to fill vacancies in the Board, the power to fill vacancies in or to
change the membership of said Committee, and the power to make or amend By-Laws
of the Company. The Board shall have the power at any time to fill vacancies in,
to change the membership of, or to dissolve, the Executive Committee. The
Executive Committee may make rules for the conduct of its business and may
appoint such committees and assistants as it shall from time to time deem
necessary. A majority of the members of the Executive Committee shall constitute
a quorum.

            Section 5. The Board of Directors may also appoint one or more other
committees to consist of such number of the directors and to have such powers as
the Board may from time to time determine. The Board shall have the power at any
time to fill vacancies in, to change the membership of, or to dissolve, any such
committee. A majority of any such committee may determine its action and fix the
time and place of its meetings, unless the Board of Directors shall otherwise
provide.


                                   ARTICLE III

                                    OFFICERS

            Section 1. As soon as is practicable after the election of directors
at the annual meeting of stockholders, the Board of Directors shall elect one of
its members President of the Company, and shall elect a Secretary. The Board may
also elect from its members a Chairman of the Board of Directors (which office
may be held by the President) and one or more Vice Chairmen of the Board of
Directors. The Board shall designate either the Chairman, if any, or the
President as the Chief Executive Officer of the Company. In addition, the Board
may elect one or more Vice Presidents (any one or more of whom may be designated
as Senior or Executive Vice Presidents), and a Treasurer, and from time to time
may appoint such Assistant Secretaries, Assistant Treasurers and other officers,
agents, and employees as it may deem proper. The offices of Secretary and
Treasurer may be held by the same person, and a Vice President of the Company
may also be either the Secretary or the Treasurer.



                                        5
<PAGE>   6
            Section 2. Between annual elections of officers, the Board of
Directors may effect such changes in Company offices as it deems necessary or
proper.

            Section 3. Subject to such limitations as the Board of Directors may
from time to time prescribe, the officers of the Company shall each have such
powers and duties as generally pertain to their respective offices, as well as
such powers and duties as from time to time may be conferred by the Board of
Directors or the Executive Committee. The Treasurer and the Assistant Treasurers
may be required to give bond for the faithful discharge of their duties, in such
sum and of such character as the Board of Directors may from time to time
prescribe.


                                   ARTICLE IV

                                 INDEMNIFICATION

            Each person who now is or hereafter becomes a director (which term
as used in this Article shall include an advisor to the Board of Directors),
officer, employee or agent of the Company, or who now is or hereafter becomes a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise at the request of the Company, shall be
entitled to indemnification as provided by law. Such right of indemnification
shall include, but not be limited to, the following:

            Section 1. (a) The Company shall indemnify any person who was or is
a party or is threatened to be made a party to any threatened, pending or
completed action, suit, or proceeding, whether civil, criminal, administrative
or investigative, other than an action by or in the right of the Company, by
reason of the fact that he is or was a director, officer, employee or agent of
the Company, or is or was serving at the request of the Company as a director,
officer, employee or agent of another corporation, partnership, joint venture,
trust or other enterprise, against expenses, including attorneys' fees,
judgments, fines and amounts paid in settlement actually and reasonably incurred
by him in connection with such action, suit or proceeding if he acted in good
faith and in a manner he reasonably believed to be in or not opposed to the best
interests of the Company, and, with respect to any criminal action or
proceeding, had no reasonable cause to believe his conduct was unlawful. The
termination of any action, suit, or proceeding by judgment, order, settlement,
conviction, or upon a plea of nolo contendere or its equivalent, shall not, of
itself, create a presumption that the person did not act in good faith and in a
manner which he reasonably believed to be in or not opposed to the best
interests of the Company, and, with respect to any criminal action or
proceeding, had reasonable cause to believe that his conduct was unlawful.

            (b) The Company shall indemnify any person who was or is a party or
is threatened to be made a party to any threatened, pending or completed action
or suit by or in the right of the Company to procure a judgment in its favor by
reason of the fact that he is or was a director, officer, employee or agent of
the Company, or is or was serving at the request of the Company as a director,
officer, employee or agent of another corporation, partnership, joint venture,
trust or other enterprise against expenses, including attorneys' fees, and
amounts paid in settlement actually and reasonably incurred by him in connection
with the defense or settlement of the action or suit

                                        6
<PAGE>   7
if he acted in good faith and in a manner he reasonably believed to be in or not
opposed to the best interests of the Company, except that no indemnification
shall be made in respect of any claim, issue or matter as to which such person
shall have been adjudged to be liable for negligence or misconduct in the
performance of his duty to the Company unless and only to the extent that the
court in which the action or suit was brought determines upon application that,
despite the adjudication of liability and in view of all the circumstances of
the case, the person is fairly and reasonably entitled to indemnity for such
expenses which the court shall deem proper.

            (c) The Company shall further indemnify to the maximum extent
permitted by law, any person who was or is a party or is threatened to be made a
party to any threatened, pending or completed action, suit, or proceeding
(including appeals), whether civil, criminal, investigative (including private
Company investigations), or administrative, including an action by or in the
right of the Company, by reason of the fact that the person is or was a
director, officer, employee or agent of the Company, or is or was serving at the
request of the Company as a director, officer, employee or agent of another
corporation, partnership, joint venture, trust or other enterprise, from and
against any and all expenses incurred by such person, including, but not limited
to, attorneys' fees, judgments, fines, and amounts paid in settlement actually
and reasonably incurred by him in connection with such action, suit or
proceeding, provided that the Company shall not indemnify any person from or on
account of such person's conduct which was finally adjudged to have been
knowingly fraudulent, deliberately dishonest or willful misconduct.

            (d) To the extent that a director, officer, employee or agent of the
Company has been successful on the merits or otherwise in defense of any action,
suit, or proceeding referred to in this Section or in defense of any claim,
issue or matter therein, he shall be indemnified against expenses, including
attorneys' fees, actually and reasonably incurred by him in connection with the
action, suit, or proceeding.

            (e) Any indemnification under this Section, unless ordered by a
court, shall be made by the Company only as authorized in the specific case upon
a determination that indemnification of the director, officer, employee or agent
is proper in the circumstances because he has met the applicable standard of
conduct set forth in this Section. The determination shall be made by the Board
of Directors by a majority vote of a quorum consisting of directors who were not
parties to the action, suit, or proceeding, or if such a quorum is not
obtainable, or even if obtainable a quorum of disinterested directors so
directs, by independent legal counsel in a written opinion, or by the
stockholders.

            (f) Where full and complete indemnification is prohibited by law or
public policy, any person referred to in subsection (a) above who would
otherwise be entitled to indemnification nevertheless shall be entitled to
partial indemnification to the extent permitted by law and public policy.
Furthermore, where full and complete indemnification is prohibited by law or
public policy, any person referred to in this Section who would otherwise be
entitled to indemnification nevertheless shall have a right of contribution to
the extent permitted by law and public policy in cases where said party is held
jointly or concurrently liable with the Company.



                                        7
<PAGE>   8
            Section 2. The indemnification provided by Section 1 shall not be
deemed exclusive of any other rights to which those seeking indemnification may
be entitled under the Articles of Incorporation or By-Laws or any agreement,
vote of stockholders or disinterested directors or otherwise both as to action
in his official capacity and as to action in another capacity while holding such
office, and the Company is hereby specifically authorized to provide such
indemnification by any agreement, vote of stockholders or disinterested
directors or otherwise. The indemnification shall continue as to a person who
has ceased to be a director, officer or employee and shall inure to the benefit
of the heirs, executors and administrators of such a person.

            Section 3. The Company is authorized to purchase and maintain
insurance on behalf of, or provide another method or methods of assuring payment
to, any person who is or was a director, officer, employee or agent of the
Company, or is or was serving at the request of the Company as a director,
officer, employee or agent of another corporation, partnership, joint venture,
trust or other enterprise against any liability asserted against him and
incurred by him in any capacity, or arising out of his status as such, whether
or not the Company would have the power to indemnify him against such liability
under the provisions of this Article.

            Section 4. Expenses incurred in defending a civil or criminal
action, suit or proceeding may be paid by the Company in advance of the final
disposition of the action, suit, or proceeding as authorized by the Board of
Directors in the specific case upon receipt of an undertaking by or on behalf of
the director, officer, employee or agent to repay such amount unless it shall
ultimately be determined that he is entitled to be indemnified by the Company as
authorized in this Article.

            Section 5. If any provision or portion of this Article shall be held
invalid, illegal or unenforceable for any reason whatsoever, the validity,
legality and enforceability of all other provisions and portions not
specifically held to be invalid, illegal or unenforceable, shall not be affected
or impaired thereby and shall be construed according to the original intent, to
the extent not precluded by applicable law.

            Section 6.   For purposes of this Article:

            (a) References to "the corporation" include all constituent
corporations absorbed in a consolidation or merger as well as the resulting or
surviving corporation so that any person who is or was a director, officer,
employee or agent of such a constituent corporation or is or was serving at the
request of such constituent corporation as a director, officer, employee or
agent of another corporation, partnership, joint venture, trust or other
enterprise shall stand in the same position under the provisions of this Article
with respect to the resulting or surviving corporation as he would if he had
served the resulting or surviving corporation in the same capacity.

            (b) The term "other enterprise" shall include employee benefit
plans; the term "fines" shall include any excise taxes assessed on a person with
respect to an employee benefit plan; and the term "serving at the request of the
corporation" shall include any service as a director, officer, employee or agent
of the corporation which imposes duties on, or involves services by, such
director, officer, employee, or agent with respect to an employee benefit plan,
its participants, or beneficiaries; and the word "include" or "includes" shall
be construed in its expansive sense and

                                        8
<PAGE>   9
not as a limiter; and a person who acted in good faith and in a manner he
reasonably believed to be in the interest of the participants and beneficiaries
of an employee benefit plan shall be deemed to have acted in a manner "not
opposed to the best interests of the corporation" as referred to in this
Article.

            Section 7. This Article may be hereafter amended or repealed;
provided, however, that no amendment or repeal shall reduce, terminate or
otherwise adversely affect the right of a person who is or was a director,
officer, employee or agent to obtain indemnification with respect to an action,
suit, or proceeding that pertains to or arises out of actions or omissions that
occur prior to the effective date of such amendment or repeal.


                                    ARTICLE V

                              CERTIFICATES OF STOCK

            Section 1. The interest of each stockholder shall be evidenced by
certificates for shares of stock of the Company, in such form as the Board of
Directors may from time to time prescribe. The certificates for shares of stock
of the Company shall be signed by the Chairman, if any, or the President or a
Vice President (including Senior or Executive Vice Presidents) and by the
Secretary or Treasurer or an Assistant Secretary or an Assistant Treasurer of
the Company and sealed with the seal of the Company and shall be countersigned
and registered in such manner, if any, as the Board of Directors may from time
to time prescribe. Any or all of the signatures on the certificate may be
facsimile and the seal may be facsimile, engraved or printed. In case any
officer, transfer agent or registrar who has signed or whose facsimile signature
has been placed upon a certificate shall have ceased to be such officer,
transfer agent or registrar before such certificate is issued, the certificate
may nevertheless be issued by the Company with the same effect as if the person
were an officer, transfer agent or registrar at the date of issue.

            Section 2. The shares of stock of the Company shall be transferable
only on the books of the Company by the holders thereof in person or by duly
authorized attorney, upon surrender for cancellation of certificates for the
same number of shares of the same class of stock, with an assignment and power
of transfer endorsed thereon or attached thereto, duly executed, and with such
proof of the authenticity of the signatures as the Company or its agents may
reasonably require.

            Section 3. No certificate for shares of stock of the Company shall
be issued in place of any certificate alleged to have been lost, stolen or
destroyed, except upon production of such evidence of such loss, theft or
destruction, and upon the Company being indemnified to such extent and in such
manner as the Board of Directors in its discretion may require.


                                        9
<PAGE>   10
                                   ARTICLE VI

                       CLOSING OF STOCK TRANSFER BOOKS OR
                               FIXING RECORD DATE

            The Board of Directors shall have power to close the stock transfer
books of the Company for a period not exceeding seventy days preceding the date
of any meeting of stockholders or the date of payment of any dividend or the
date for the allotment of rights or the date when any change or conversion or
exchange of shares shall go into effect; provided, however, that in lieu of
closing the stock transfer books as aforesaid, the Board of Directors may fix in
advance a date, not exceeding seventy days preceding the date of any meeting of
stockholders, or the date for the payment of any dividend, or the date for the
allotment of rights, or the date when any change or conversion or exchange of
shares shall go into effect, as a record date for the determination of the
stockholders entitled to notice of, and to vote at, any such meeting, and any
adjournment thereof, or entitled to receive payment of any such dividend, or
entitled to any such allotment of rights, or entitled to exercise the rights in
respect of any such change, conversion or exchange of shares. In such case such
stockholders and only such stockholders as shall be stockholders of record on
the date of closing the stock transfer books or on the record date so fixed
shall be entitled to notice of, and to vote at, such meeting, and any
adjournments thereof, or to receive payment of such dividend, or to receive such
allotment of rights, or to exercise such rights, as the case may be,
notwithstanding any transfer of any shares on the books of the Company after
such date of closing of the transfer books or such record date fixed as
aforesaid.


                                   ARTICLE VII

                               CHECKS, NOTES, ETC.

            All checks and drafts on the Company's bank accounts and all bills
of exchange and promissory notes, and all acceptances, obligations and other
instruments for the payment of money, shall be signed by such officer or
officers or agent or agents as shall be thereunto authorized from time to time
by the Board of Directors. The Board of Directors may authorize any such officer
or agent to sign and, when the Company's seal is on the instrument, to attest
any of the foregoing instruments by the use of a facsimile signature, engraved
or printed or otherwise affixed thereto. In case any officer or agent who has
signed or whose facsimile signature has been placed upon any such instrument for
the payment of money shall have ceased to be such officer or agent before such
instrument is issued, such instrument may nevertheless be issued by the Company
with the same effect as if such officer or agent had not ceased to be such
officer or agent at the date of its issue.




                                       10
<PAGE>   11
                                  ARTICLE VIII

                                   FISCAL YEAR

            The fiscal year of the Company shall begin on the first day of
January in each year and shall end on the thirty-first day of December following
until otherwise changed by resolution of the Board, and the Board is authorized
at any time by resolution to adopt and fix a different fiscal year for the
Company.


                                   ARTICLE IX

                                 CORPORATE SEAL

            The corporate seal shall have inscribed thereon the name of the
Company and the words "Corporate Seal, Missouri".


                                    ARTICLE X

                                   AMENDMENTS

            The By-Laws of the Company may be made, altered, amended, or
repealed by the Board of Directors.


                                   ARTICLE XI

            Words used herein denoting a specific gender, shall be construed to
include any other gender, as applicable in the context.

                                       11


<PAGE>   1
                                                                      Exhibit 13


    FINANCIAL TABLE OF CONTENTS

17  Responsibility for Financial Statements
    and Report of Independent Accountants

18  Management's Discussion
    and Analysis

24  Consolidated Balance Sheet

26  Consolidated Statement of Income

27  Consolidated Statement of Cash Flows

28  Consolidated Statement of
    Retained Earnings and Selected
    Quarterly Information

29  Notes to Consolidated Financial
    Statements

45  Selected Consolidated Financial
    Information

46  Electric Operating Statistics

47  Gas Operating Statistics


                    RESPONSIBILITY FOR FINANCIAL STATEMENTS

   The management of Ameren Corporation is responsible for the information and
representations contained in the consolidated financial statements and in other
sections of this Annual Report. The consolidated financial statements have been
prepared in conformity with generally accepted accounting principles. Other
information included in this report is consistent, where applicable, with the
consolidated financial statements.

   The Company maintains a system of internal accounting controls designed to
provide reasonable assurance as to the integrity of the financial records and
the protection of assets. Qualified personnel are selected and an organization
structure is maintained that provides for appropriate functional responsibility.

   Written policies and procedures have been developed and are revised as
necessary. The Company maintains and supports an extensive program of internal
audits with appropriate management follow up.

   The Board of Directors, through its Auditing Committee comprised of outside
directors, is responsible for ensuring that both management and the independent
accountants fulfill their respective responsibilities relative to the financial
statements. Moreover, the independent accountants have full and free access to
meet with the Auditing Committee, with or without management present, to discuss
auditing or financial reporting matters.

                       REPORT OF INDEPENDENT ACCOUNTANTS

February 5, 1998

                                                   [LOGO]  PRICE WATERHOUSE LLP

                                                            800 Market Street
                                                          St. Louis, MO 63101
                                                       Telephone 314-206-8500


        To the Stockholders and Board of Directors of Ameren Corporation

   In our opinion, based upon our audits and the reports of other auditors, the
accompanying consolidated balance sheet and the related consolidated statements
of income, of cash flows and retained earnings appearing on pages 24-28 of this
report present fairly, in all material respects, the financial position of
Ameren Corporation and its subsidiaries at December 31, 1997 and 1996, and the
results of their operations and their cash flows for each of the three years in
the period ended December 31, 1997, in conformity with generally accepted
accounting principles. These financial statements are the responsibility of the
Company's management; our responsibility is to express an opinion on these
financial statements based on our audits. We did not audit the financial
statements of Central Illinois Public Service Company and CIPSCO Investment
Company, wholly-owned subsidiaries, which combined statements reflect total
assets of $1,889,451,000 and $1,913,691,000 at December 31, 1997 and 1996,
respectively, and total revenues of $863,441,000, $891,631,000 and $837,216,000
for the three years in the period ended December 31, 1997, respectively. Those
statements were audited by other auditors whose reports thereon have been
furnished to us, and our opinion expressed herein, insofar as it relates to the
amounts included for Central Illinois Public Service Company and CIPSCO
Investment Company, is based solely on the reports of the other auditors. We
conducted our audits of these statements in accordance with generally accepted
auditing standards which require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements, assessing the
accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. We believe that our
audits and the reports of other auditors provide a reasonable basis for the
opinion expressed above.

                                                  /s/ PRICE WATERHOUSE LLP 



                                                                              17
<PAGE>   2
                      MANAGEMENT'S DISCUSSION AND ANALYSIS

OVERVIEW   Ameren Corporation (Ameren) is a newly created holding company which
           is registered under the Public Utility Holding Company Act of 1935
           (PUHCA). In December 1997, Union Electric Company (AmerenUE) and
           CIPSCO Incorporated (CIPSCO) combined to form Ameren, with AmerenUE
           and CIPSCO's subsidiaries, Central Illinois Public Service Company
           (AmerenCIPS) and CIPSCO Investment Company (CIC) becoming
           wholly-owned subsidiaries of Ameren (the Merger). In addition,
           Ameren, as a result of the Merger, has a 60% ownership interest in
           Electric Energy, Inc. (EEI), which is consolidated for financial
           reporting purposes.

             The Merger was accounted for as a pooling of interests; therefore
           the consolidated financial statements are presented as if the Merger
           were consummated as of the beginning of the earliest period
           presented. However, the consolidated financial statements are not
           necessarily indicative of the results of operations, financial
           position or cash flows that would have occurred had the Merger been
           consummated for the periods for which it is given effect, nor is it
           necessarily indicative of the future results of operations, financial
           position or cash flows.

             References to the Company are to Ameren on a consolidated basis;
           however, in certain circumstances, the subsidiaries are separately
           referred to in order to distinguish between their different business
           activities.

RESULTS OF EARNINGS. Earnings for 1997, 1996 and 1995, were $335 million ($2.44
OPERATIONS per share), $372 million ($2.71 per share) and $373 million ($2.72
           per share), respectively. Earnings and earnings per share fluctuated
           due to many conditions, primarily: weather variations, electric rate
           reductions, competitive market forces, credits to electric customers,
           sales growth, fluctuating operating costs, including Callaway Plant
           nuclear refueling outages, merger-related expenses, changes in
           interest expense, changes in income and property taxes and an
           extraordinary charge.              
           

             The Company recorded an extraordinary charge to earnings in the
           fourth quarter of 1997 for the write-off of generation-related
           regulatory assets and liabilities of the Company's Illinois retail
           electric business as a result of electric industry restructuring
           legislation enacted in Illinois in December 1997. The write-off
           reduced earnings $52 million, net of income taxes, or 38 cents per
           share. (See Note 2 - Regulatory Matters under Notes to Consolidated
           Financial Statements for further information.)

           ELECTRIC OPERATIONS. The impacts of the more significant items
           affecting electric revenues and operating expenses during the past
           three years are analyzed and discussed below:

<TABLE>
<CAPTION>
                                                           Variations from Prior Year   
                                                           ----------------------------
           ELECTRIC REVENUES (Millions of Dollars)         1997        1996        1995
           ----------------------------------------------------------------------------
<S>                                                        <C>         <C>         <C>  
           Rate variations                                 $ --        $(20)       $(14)
           Credit to customers                               28         (15)        (33)
           Effect of abnormal weather                         3         (28)         63
           Growth and other                                   5          67          51
           Interchange sales                                (43)         51         (13)
           EEI                                                9          (2)        (76)
           ----------------------------------------------------------------------------
                                                           $  2        $ 53        $(22)
           ----------------------------------------------------------------------------
</TABLE>
                                           
             Electric revenues for 1997 were flat compared to 1996, reflecting a
           decrease in the Missouri electric customer credits recorded in 1997
           versus 1996 (see Note 2 - Regulatory Matters under Notes to
           Consolidated Financial Statements for further information), partly
           offset by a 1% decrease in kilowatthour sales. The kilowatthour sales
           decrease was due to a 13% decrease in interchange sales due to market
           conditions and differences in the classification of certain
           interchange and purchased power transactions resulting from the
           Federal Energy Regulatory Commission (FERC) Order 888 and a 1%
           decline in residential sales. These decreases were partly offset by
           increases in commercial and industrial sales of 1% and 2%,
           respectively, attributable to economic growth. In addition, sales at
           EEI were up 6% over 1996.

             The increase in 1996 electric revenues was primarily due to a 5%
           increase in kilowatthour sales over the prior year, partly offset by
           the 1.8% rate decrease for Missouri electric customers and the net
           increase in Missouri electric customer credits recorded in 1996
           versus 1995. (See Note 2 -- Regulatory Matters under Notes to
           Consolidated Financial Statements for further information.) The
           kilowatthour sales increase reflected economic growth in the service
           area and increased interchange sales opportunities, partially offset
           by milder weather during the period. Residential and industrial sales
           each rose 2% over 1995, while commercial sales grew 3% and
           interchange sales increased 32%.

             The decrease in 1995 electric revenues was primarily the result of
           decreased sales to the Department of Energy by EEI, a one-time $30
           million credit to Missouri electric customers and rate decrease in
           Missouri. (See Note 2 - Regulatory Matters under Notes to
           Consolidated Financial Statements for further 


18
<PAGE>   3
           information.) This decrease was partially offset by increased retail
           kilowatthour sales, mainly due to the unusually hot weather in the
           third quarter of 1995, compared to 1994, and sales growth reflecting
           the Company's healthy service area economy. Weather-sensitive
           residential and commercial sales increased 6% and 3%, respectively,
           over 1994, and industrial sales grew 2%.

<TABLE>
<CAPTION>
                                                                      Variations from Prior Year
           --------------------------------------------------------------------------------------
           FUEL AND PURCHASED POWER (Millions of Dollars)          1997        1996          1995
           --------------------------------------------------------------------------------------
<S>                                                               <C>          <C>          <C>
           Fuel:
              Variation in generation                             $ 25           $43         $(10)
              Price                                                (24)          (14)           2
              Generation efficiencies and other                     (5)            2            3
           Purchased power variation                               (50)            2            9
           EEI                                                      10            23          (42)
           --------------------------------------------------------------------------------------
                                                                  $(44)          $56         $(38)
           ======================================================================================
</TABLE>


           The decrease in 1997 fuel and purchased power costs was primarily due
           to reduced purchased power costs, resulting from relatively flat
           native load sales, lower interchange sales and lower fuel prices,
           offset by greater generation.The increase in 1996 fuel and purchased
           power costs was driven mainly by higher kilowatthour sales, partially
           offset by lower fuel prices due to the use of lower cost coal. The
           decrease in 1995 fuel and purchased power costs reflected decreased
           sales by EEI, partly offset by greater retail kilowatthour sales
           during the hot 1995 summer and the need for replacement power during
           Callaway Plant's spring nuclear refueling outage.

           GAS OPERATIONS. Gas revenues in 1997 decreased $4 million primarily
           due to a 12% decrease in retail dekatherm sales. Weather-sensitive
           residential and commercial sales declined 15% and 18%, respectively.
           These decreases were partly offset by a 20% increase in industrial
           sales and an increase in off-system sales of gas to others. The
           increase in 1996 gas revenues of $37 million was primarily the result
           of higher gas prices and increased sales due to colder weather.
           Residential and commercial dekatherm sales increased 13% and 17%,
           respectively, in 1996 versus 1995. Gas revenues decreased $8 million
           in 1995 primarily as a result of lower prices and lower industrial
           dekatherm sales.

           Gas costs for 1997 remained flat as compared to those of 1996. The
           $35 million increase in 1996 gas costs was primarily the result of a
           combination of increased demand due to colder weather and an increase
           in the price paid for gas in 1996 versus 1995. The decrease in 1995
           gas costs of $20 million was predominantly due to lower gas prices in
           1995, compared to 1994.

           OTHER OPERATING EXPENSES. Other operating expense variations in 1995
           through 1997 reflected recurring factors such as growth, inflation,
           labor and benefit increases. In 1997, other operations expenses
           increased $41 million primarily due to increases in information
           system-related costs, labor and injuries and damages expenses. In
           1996, other operations expenses increased $2 million primarily due to
           increases in employee benefits, injuries and damages and information
           system-related costs, offset by decreases resulting from several
           nonrecurring costs incurred in 1995. Other operations expenses
           increased $7 million in 1995, mainly due to increases in labor and
           material and supplies expenses, as well as the occurrence of several
           nonrecurring costs, including costs related to a voluntary separation
           program and write-offs of system development costs. These increases
           were partly offset by decreases in employee benefits, injuries and
           damages and insurance expenses.

           Maintenance expenses for 1997 increased $8 million primarily
           resulting from increased scheduled fossil plant maintenance, partly
           offset by decreased expenses at Callaway Plant due to the absence of
           a refueling outage in 1997. In 1996, maintenance expenses decreased
           $5 million primarily due to lower scheduled power plant maintenance,
           partly offset by increased labor expenses at Callaway Plant. In 1995,
           maintenance expenses increased $26 million mainly due to scheduled
           power plant maintenance expenses, partially offset by reduced
           distribution system maintenance expenses. Callaway Plant's
           maintenance expenses increased $17 million primarily due to the
           spring 1995 refueling outage. Maintenance expenses at other power
           plants increased primarily due to scheduled maintenance outages.

           Depreciation and amortization expense increased $7 million in 1997,
           $12 million in 1996 and $11 million in 1995, due to increased
           depreciable property.

           TAXES. Income tax expense from operations decreased $19 million in
           1997 principally due to lower pretax income and a lower effective tax
           rate. Income tax expense from operations decreased $8 million in 1996
           principally due to lower pretax income. Income tax expense from
           operations decreased $2 million in 1995 primarily due to lower pretax
           income, partially offset by a higher effective income tax rate.



                                                                              19
<PAGE>   4
           OTHER INCOME AND DEDUCTIONS. Miscellaneous, net increased $11 million
           for 1997, compared to 1996, primarily due to the capitalization of
           merger-related expenses. (See Note 2 - Regulatory Matters under
           Notes to Consolidated Financial Statements for further information.)
           Miscellaneous, net increased $2 million for 1996 primarily due to
           reduced merger-related expenses. Miscellaneous, net decreased $11
           million for 1995 primarily due to increased merger-related expenses.

           INTEREST. Interest expense increased $5 million in 1997 primarily due
           to higher debt outstanding during the year at higher interest rates.
           Interest expense increased $2 million for 1996 primarily due to a
           greater amount of short-term debt outstanding, offset by lower rates
           on variable-rate long-term debt. In 1995, interest expense declined
           $5 million as decreases in other interest expense were partly offset
           by higher interest rates on variable long-term debt.

           BALANCE SHEET. The $26 million decrease in other current liabilities
           was primarily due to a lower accrued customer credit. (See Note 2 -
           Regulatory Matters under Notes to Consolidated Financial Statements
           for further information.) The $50 million increase in other deferred
           credits and liabilities was attributable to increases in the accrued
           pension liability and the nuclear decommissioning trust fund.

LIQUIDITY    Cash provided by operating activities totaled $687 million for
  AND      1997, compared to $786 million and $792 million in 1996 and 1995,
CAPITAL    respectively.
RESOURCES 
             Cash flows used in investing activities totaled $387 million, $481
           million and $468 million, for the years ended December 31, 1997, 1996
           and 1995, respectively. Expenditures in 1997 for constructing new or
           to improve existing facilities, purchasing rail cars and complying
           with the Clean Air Act were $381 million. In addition, the Company
           spent $35 million to acquire nuclear fuel.

             Construction expenditures are expected to be about $315 million in
           1998. For the five-year period 1998-2002, construction expenditures
           are estimated at $1.7 billion. This estimate does not include any
           construction expenditures which may be incurred by the Company to
           meet new air quality standards for ozone and particulate matter, as
           discussed below.

             The Company's need for additional base load electric generating
           capacity is not anticipated until after the year 2013. Under Title IV
           of the Clean Air Act Amendments of 1990, the Company is required to
           significantly reduce total annual sulfur dioxide emissions by the
           year 2000. Significant reductions in nitrogen oxide are also
           required. By switching to low-sulfur coal and early banking of
           emissions credits, the Company anticipates that it can comply with
           the requirements of the law without significant revenue increases
           because the related capital costs are largely offset by lower fuel
           costs. As of year-end 1997, estimated remaining capital costs
           expected to be incurred pertaining to Clean Air Act-related projects
           totaled $107 million.

             In July 1997, the United States Environmental Protection Agency
           (EPA) issued final regulations revising the National Ambient Air
           Quality Standards for ozone and particulate matter. Although specific
           emission control requirements are still being developed, it is
           believed that the revised standards will require significant
           additional reductions in nitrogen oxide and sulfur dioxide emissions
           from coal-fired boilers. In October 1997, the EPA announced that
           Missouri and Illinois are included in the area targeted for nitrogen
           oxide emissions reductions as part of the EPA's regional control
           program. Reduction requirements in nitrogen oxide emissions from the
           Company's coal-fired boilers could exceed 80% from 1990 levels by the
           year 2002. Reduction requirements in sulfur dioxide emissions may be
           up to 50% beyond that already required by Phase II acid rain control
           provisions of the 1990 Clean Air Act Amendments and could be required
           by 2007. Because of the magnitude of these additional reductions, the
           Company could be required to incur significantly higher capital costs
           to meet future compliance obligations for its coal-fired boilers or
           purchase power from other sources, either of which could have
           significantly higher operations and maintenance expenditures
           associated with compliance. At this time, the Company is unable to
           determine the impact of the revised air quality standards on its
           future financial condition, results of operations or liquidity.

             In December 1997, the United States and numerous other countries
           agreed to certain environmental provisions (the Kyoto Protocol),
           which would require decreases in greenhouse gases in an effort to
           address the "global warming" issue. The Company is unable to predict
           what requirements, if any, will be adopted in this country. However,
           implementation of the Kyoto Protocol in its present form would likely
           result in significantly higher capital costs and operations and
           maintenance expenditures by the Company. At this time, the Company is
           unable to determine the impact of these proposals on its future
           financial condition, results of operations or liquidity.

             See Note 11 - Callaway Nuclear Plant under Notes to Consolidated
           Financial Statements for a discussion of Callaway Plant
           decommissioning costs.

             Cash flows used in financing activities were $302 million for 1997,
           compared to $296 million and $325 million for 1996 and 1995,
           respectively. The Company's principal financing activities during
           1997 included the issuance of $187 million of long-term debt, offset
           by the redemption of $123 million of long-term debt and $64 million
           of preferred stock and the payment of dividends.

             The Company plans to continue utilizing short-term debt to support
           normal operations and other tem-



20
<PAGE>   5
              porary requirements. The Company's utility operating subsidiaries
              are authorized by the FERC to have up to an aggregate $750 million
              of short-term unsecured debt instruments outstanding at any one
              time. Short-term borrowings consist of bank loans (maturities
              generally on an overnight basis) and commercial paper (maturities
              generally within 10 to 45 days). At December 31, 1997, the Company
              had committed bank lines of credit aggregating $259 million (of
              which $244 million were unused and $179 million were available at
              such date) which make available interim financing at various rates
              of interest based on LIBOR, the bank certificate of deposit rate
              or other options. The lines of credit are renewable annually at
              various dates throughout the year. At year-end, the Company had
              $86 million of short-term borrowings.

                 AmerenUE also has bank credit agreements due 1999 which permit
              the borrowing of up to $300 million and $200 million on a
              long-term basis. At December 31, 1997, $35 million of such
              borrowings were outstanding.

                 Additionally, AmerenUE has a lease agreement which provides for
              the financing of nuclear fuel. At December 31, 1997, the maximum
              amount that could be financed under the agreement was $120
              million. Cash provided from financing for 1997 included issuances
              under the lease for nuclear fuel of $40 million, offset in part by
              $28 million of redemptions. At December 31, 1997, $117 million was
              financed under the lease. (See Note 3 - Nuclear Fuel Lease under
              Notes to Consolidated Financial Statements for further
              information.)

 RATE MATTERS See Note 2 - Regulatory Matters under Notes to Consolidated
              Financial Statements for a discussion of rate matters.

CONTINGENCIES See Note 10 - Commitments and Contingencies under Notes to
              Consolidated Financial Statements for material issues existing at
              December 31, 1997.

    DIVIDENDS Common stock dividends paid in 1997 resulted in a payout rate
              of 99% of the Company's earnings to common stockholders (86% of
              earnings before extraordinary charge). Dividends paid to common
              stockholders in relation to net cash provided by operating
              activities for the same period were 48%.

                 The Board of Directors does not set specific targets or payout
              parameters for dividend payments; however, the Board considers
              various issues including the Company's historic earnings and cash
              flow; projected earnings, cash flow and potential cash flow
              requirements; dividend payout rates at other utilities; return on
              investments with similar risk characteristics; and overall
              business considerations. On February 13, 1998, the Ameren Board of
              Directors declared a quarterly common stock dividend of 63.5 cents
              per share, payable March 31, 1998.

     ELECTRIC Changes enacted and being considered at the federal and state
     INDUSTRY levels continue to change the structure of the electric industry
RESTRUCTURING and utility regulation, as well as encourage increased
              competition. At the federal level, the Energy Policy Act of 1992
              reduced various restrictions on the operation and ownership of
              independent power producers and gave the FERC the authority to
              order electric utilities to provide transmission access to third
              parties.

                 In April 1996, the FERC issued Order 888 and Order 889, which
              are intended to promote competition in the wholesale electric
              market. The FERC requires transmission-owning public utilities,
              such as AmerenUE and AmerenCIPS, to provide transmission access
              and service to others in a manner similar and comparable to that
              which the utilities have by virtue of ownership. Order 888
              requires that a single tariff be used by the utility in providing
              transmission service. Order 888 also provides for the recovery of
              stranded costs, under certain conditions, related to the wholesale
              business.

                 Order 889 established the standards of conduct and information
              requirements that transmission owners must adhere to in doing
              business under the open access rule. Under Order 889, utilities
              must obtain transmission service for their own use in the same
              manner their customers will obtain service, thus mitigating market
              power through control of transmission facilities. In addition,
              under Order 889, utilities must separate their merchant function
              (buying and selling wholesale power) from their transmission and
              reliability functions.

                 The Company believes that Order 888 and Order 889, which relate
              to its wholesale business, will not have a material adverse effect
              on its financial condition, results of operations or liquidity.

                 In addition, certain states are considering proposals or have
              adopted legislation that will promote competition at the retail
              level. In December 1997, the Governor of Illinois signed the
              Electric Service Customer Choice and Rate Relief Law of 1997 (the
              Act) providing for electric utility restructuring in Illinois.
              This legislation introduces competition into the supply of
              electric energy in Illinois. (See Note 2 - Regulatory Matters
              under Notes to Consolidated Financial Statements for further
              information.)

                 After evaluating the impact of this legislation, the Company
              determined that it was necessary to write-off the
              generation-related regulatory assets and liabilities of its
              Illinois retail electric business. This extraordinary charge
              reduced 1997 earnings $52 million, net of income taxes, or 38
              cents per share. The Company has also concluded that its remaining
              net generation-related assets are not impaired and that no plant
              write-downs are necessary at this time. The provisions of the Act
              could 

                                                               [AMEREN LOGO]  21
<PAGE>   6
              also result in lower revenues, reduced profit margins and
              increased costs of capital. At this time, the Company is unable to
              determine any further impact of the Act on its future financial
              condition, results of operations or liquidity. (See Note 2 -
              Regulatory Matters under Notes to Consolidated Financial
              Statements for further information.)

                 In Missouri, where approximately 72% of the Company's retail
              electric revenues are derived, a task force appointed by the
              Missouri Public Service Commission (MoPSC) is investigating
              electric industry restructuring and competition and is expected to
              issue a report to the MoPSC in 1998. A joint legislative committee
              is also conducting hearings on these issues. Up to this point,
              retail wheeling has not been allowed in Missouri; however, the
              joint agreement approved by the MoPSC in February 1997 as part of
              its merger authorization includes a provision that required
              AmerenUE to file a proposal for a 100-megawatt experimental retail
              wheeling pilot program in Missouri. AmerenUE filed its proposal
              with the MoPSC in September 1997. This proposal is subject to
              review and approval by the MoPSC.

                 The Company is unable to predict the timing or ultimate outcome
              of electric industry restructuring in the state of Missouri, as
              well as its impact on the Company's future financial condition,
              results of operations or liquidity. The potential negative
              consequences of electric industry restructuring could be
              significant and include the impairment and write-down of certain
              assets, including generation-related plant and net regulatory
              assets, lower revenues, reduced profit margins and increased costs
              of capital. (See Note 2 - Regulatory Matters under Notes to
              Consolidated Financial Statements for further information.)

INFORMATION   The Year 2000 issue relates to computer systems and
    SYSTEMS   applications that currently use two-digit date fields to designate
              a year. As the century date change occurs, date-sensitive systems
              will recognize the year 2000 as 1900, or not at all. This
              inability to recognize or properly treat the year 2000 may cause
              systems to process critical financial and operational information
              incorrectly.

                 The Company is utilizing both internal and external resources
              to identify, correct or reprogram and test information systems for
              Year 2000 compliance. The Company estimates that its costs for
              addressing the Year 2000 issue will range from $10 million to $15
              million. These costs will be expensed as incurred.

    OUTLOOK   Significant changes are taking place in the electric utility
              industry. The Company's management and Board of Directors
              recognize that competition will likely continue to increase in the
              future, especially in the energy supply portion of the business.
              New air quality standards are being considered which could
              significantly increase capital costs, purchased power expenses and
              other operations and maintenance expenditures. In addition,
              expenditures for information systems are increasing (including
              those costs associated with the Year 2000 issue). These issues
              will result in numerous challenges and uncertainties for Ameren
              and the utility industry, including the potential for increased
              earnings pressure on Ameren and other electric utilities. Due to
              the factors cited above, as well as expected future rate decreases
              in the Company's Illinois and Missouri jurisdictions (see Note 2 -
              Regulatory Matters under Notes to Consolidated Financial
              Statements for further information) and other operating conditions
              (such as the refueling of Callaway Nuclear Plant), management
              believes that 1998 earnings will likely be lower than 1997
              earnings, excluding the extraordinary charge for the write-off of
              the generation-related regulatory assets and liabilities
              associated with the Company's Illinois retail electric business.
              In addition, the factors cited previously may also contribute to
              earnings pressure beyond 1998. At this time, management cannot
              predict the ultimate timing or impact of these matters on its
              future financial condition, results of operations or liquidity.

                 Ameren management and its Board of Directors are taking actions
              to address these challenges. Efforts are underway to accelerate
              merger cost savings and other expense reductions. The Company is
              also analyzing the potential benefits associated with the Illinois
              electric industry restructuring legislation, including the
              elimination of the fuel adjustment clause and the securitization
              of certain future revenues. In addition, the Company will continue
              to focus on developing its core energy business for additional
              growth opportunities, as evidenced by the recent formation of a
              power marketing and energy services affiliate, Ameren Energy, Inc.
              Through these initiatives and other strategies, the Company
              intends to address these challenges, maximize the value of its
              strategic generating assets and enhance shareholder value.

ACCOUNTING    In June 1997, the Financial Accounting Standards Board issued
   MATTERS    Statement of Financial Accounting Standards (SFAS) No. 130,
              "Reporting Comprehensive Income" and SFAS No. 131, "Disclosures
              about Segments of an Enterprise and Related Information." SFAS 130
              establishes standards for reporting and displaying comprehensive
              income. SFAS 131 establishes standards for reporting information
              about operating segments in annual financial statements and
              interim reports to shareholders. SFAS 130 and SFAS 131 are
              effective for fiscal years beginning after December 15, 1997. SFAS
              130 and SFAS 131 are not expected to have a material effect on the
              Company's financial position or results of operations upon
              adoption.


22
<PAGE>   7
     EFFECTS OF   The Company's rates for retail electric and gas service are
  INFLATION AND   regulated by the MoPSC and the Illinois Commerce Commission.
CHANGING PRICES   Non-retail electric rates are regulated by the FERC.

                     The current replacement cost of the Company's utility plant
                  substantially exceeds its recorded historical cost. Under
                  existing regulatory practice, only the historical cost of
                  plant is recoverable from customers. As a result, cash flows
                  designed to provide recovery of historical costs through
                  depreciation may not be adequate to replace plant in future
                  years. However, existing regulatory practice may be modified
                  for the Company's generation portion of its business (see Note
                  2 - Regulatory Matters under Notes to Consolidated Financial
                  Statements for further information). In addition, the impact
                  on common stockholders is mitigated to the extent depreciable
                  property is financed with debt that is repaid with dollars of
                  less purchasing power.

                     In Illinois, changes in the cost of fuel for electric
                  generation and gas costs are generally reflected in billings
                  to customers through fuel and purchased gas adjustment
                  clauses. However, existing regulatory practice may be modified
                  in the Illinois retail jurisdiction for changes in the cost of
                  fuel for electric generation (see Note 2 - Regulatory Matters
                  under Notes to Consolidated Financial Statements for further
                  information). In the Missouri retail jurisdiction, the cost of
                  fuel for electric generation is reflected in base rates with
                  no provision for changes to be made through a fuel adjustment
                  clause. Changes in gas costs in the Missouri retail
                  jurisdiction are generally reflected in billings to customers
                  through a purchased gas adjustment clause.

                     Inflation continues to be a factor affecting operations,
                  earnings, stockholders' equity and financial performance.

    SAFE HARBOR      Statements made in this annual report to stockholders which
      STATEMENT   are not based on historical facts, are forward-looking and,
                  accordingly, involve risks and uncertainties that could cause
                  actual results to differ materially from those discussed.
                  Although such forward-looking statements have been made in
                  good faith and are based on reasonable assumptions, there is
                  no assurance that the expected results will be achieved. These
                  statements include (without limitation) statements as to
                  future expectations, beliefs, plans, strategies, objectives,
                  events, conditions and financial performance. In connection
                  with the "Safe Harbor" provisions of the Private Securities
                  Litigation Reform Act of 1995, the Company is providing this
                  cautionary statement to identify important factors that could
                  cause actual results to differ materially from those
                  anticipated. Factors include, but are not limited to, the
                  effects of regulatory actions; changes in laws and other
                  governmental actions; competition; future market prices for
                  electricity; average rates for electricity in the Midwest;
                  business and economic conditions; weather conditions; fuel
                  prices and availability; generation plant performance;
                  monetary and fiscal policies; and legal and administrative
                  proceedings.



                                                             [AMEREN LOGO]    23
<PAGE>   8
Consolidated Balance Sheet


<TABLE>
<CAPTION>
ASSETS
(Thousands of Dollars)
- ---------------------------------------------------------------------------------------------
December 31,                                                           1997           1996
- ---------------------------------------------------------------------------------------------
<S>                                                                <C>            <C>
PROPERTY AND PLANT, AT ORIGINAL COST:
   Electric                                                        $11,522,730    $11,252,095
   Gas                                                                 447,458        428,531
   Other                                                                36,023        35,965
- ---------------------------------------------------------------------------------------------
                                                                    12,006,211     11,716,591
   Less accumulated depreciation and amortization                    5,285,434      5,024,046
- ---------------------------------------------------------------------------------------------
                                                                     6,720,777      6,692,545
   Construction work in progress:
      Nuclear fuel in process                                          134,804         96,147
      Other                                                            131,504        162,414
- ---------------------------------------------------------------------------------------------
         TOTAL PROPERTY AND PLANT, NET                               6,987,085      6,951,106
- ---------------------------------------------------------------------------------------------
INVESTMENTS AND OTHER ASSETS:
   Investments                                                          97,188        113,310
   Nuclear decommissioning trust fund                                  122,438         96,601
   Other                                                                64,915         64,655
- ---------------------------------------------------------------------------------------------
         TOTAL INVESTMENTS AND OTHER ASSETS                            284,541        274,566
- ---------------------------------------------------------------------------------------------
CURRENT ASSETS:
   Cash and cash equivalents                                             9,696         11,899
   Accounts receivable - trade (less allowance for doubtful
      accounts of $4,845 and $5,795, respectively)                     266,306        268,839
   Unbilled revenue                                                    102,864        106,316
   Other accounts and notes receivable                                  49,765         55,256
   Materials and supplies, at average cost -
      Fossil fuel                                                       93,431        106,153
      Other                                                            134,152        137,953
   Other                                                                55,002         42,759
- ---------------------------------------------------------------------------------------------
         TOTAL CURRENT ASSETS                                          711,216        729,175
- ---------------------------------------------------------------------------------------------
REGULATORY ASSETS:
   Deferred income taxes                                               639,792        734,206
   Other                                                               204,913        243,514
- ---------------------------------------------------------------------------------------------
         TOTAL REGULATORY ASSETS                                       844,705        977,720
- ---------------------------------------------------------------------------------------------

TOTAL ASSETS                                                        $8,827,547     $8,932,567
=============================================================================================
</TABLE>


See Notes to Consolidated Financial Statements.



24
<PAGE>   9
Consolidated Balance Sheet

CAPITAL AND LIABILITIES
(Thousands of Dollars)
<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------
December 31,                                                                            1997          1996
- --------------------------------------------------------------------------------------------------------------
<S>                                                                               <C>               <C>
CAPITALIZATION:
   Common stock, $.01 par value, authorized 400,000,000 shares -               
         outstanding 137,215,462 shares                                           $       1,372     $    1,372
   Other paid-in capital, principally premium on common stock                         1,582,938      1,583,728
   Retained earnings (see accompanying statement)                                     1,434,658      1,431,295
- --------------------------------------------------------------------------------------------------------------
         Total common stockholders' equity                                            3,018,968      3,016,395
   Preferred stock not subject to mandatory redemption (Note 4)                         235,197        298,497
   Preferred stock subject to mandatory redemption (Note 4)                                  -             624
   Long-term debt (Note 6)                                                            2,506,068      2,335,454
- --------------------------------------------------------------------------------------------------------------
         TOTAL CAPITALIZATION                                                         5,760,233      5,650,970
- --------------------------------------------------------------------------------------------------------------



MINORITY INTEREST IN CONSOLIDATED SUBSIDIARY                                              3,534          3,534
- --------------------------------------------------------------------------------------------------------------


CURRENT LIABILITIES:
   Current maturity of long-term debt                                                    52,241        146,410
   Short-term debt                                                                       86,266         69,068
   Accounts and wages payable                                                           293,391        297,017
   Accumulated deferred income taxes                                                     35,809         43,933
   Taxes accrued                                                                        110,566         65,245
   Other                                                                                168,727        194,239
- --------------------------------------------------------------------------------------------------------------
         TOTAL CURRENT LIABILITIES                                                      747,000        815,912
- --------------------------------------------------------------------------------------------------------------
Construction, Commitments and Contingencies (Notes 10 and 11)
Accumulated Deferred Income Taxes                                                     1,556,981      1,653,095
Accumulated Deferred Investment Tax Credits                                             190,260        209,227
Regulatory Liability                                                                    224,225        304,172
Other Deferred Credits and Liabilities                                                  345,314        295,657
- --------------------------------------------------------------------------------------------------------------
TOTAL CAPITAL AND LIABILITIES                                                        $8,827,547     $8,932,567
==============================================================================================================
</TABLE>


See Notes to Consolidated Financial Statements.


                                                 [AMEREN LOGO]             25
<PAGE>   10
Consolidated Statement Of Income

(Thousands of Dollars, Except Shares and per Share Amounts)
<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------
Year ended December 31,                                                       1997            1996           1995
- -------------------------------------------------------------------------------------------------------------------
<S>                                                                       <C>             <C>            <C>
OPERATING REVENUES:                                                                    
   Electric                                                               $3,064,177      $3,061,856     $3,008,481
   Gas                                                                       249,815         254,412        217,420
   Other                                                                      12,551          12,153          9,976
- -------------------------------------------------------------------------------------------------------------------
         TOTAL OPERATING REVENUES                                          3,326,543       3,328,421      3,235,877
- -------------------------------------------------------------------------------------------------------------------
OPERATING EXPENSES:                                                                    
   Operations                                                                          
      Fuel and purchased power                                               836,445        880,204         823,951
      Gas                                                                    160,679        160,776         125,305
      Other                                                                  585,214        543,998         542,386
- -------------------------------------------------------------------------------------------------------------------
                                                                           1,582,338      1,584,978       1,491,642
- -------------------------------------------------------------------------------------------------------------------
   Maintenance                                                               310,241        302,203         307,546
   Depreciation and amortization                                             346,000        339,276         327,201
   Income taxes                                                              234,179        253,005         260,940
   Other taxes                                                               271,711        273,034         270,670
- -------------------------------------------------------------------------------------------------------------------
         TOTAL OPERATING EXPENSES                                          2,744,469      2,752,496       2,657,999
- -------------------------------------------------------------------------------------------------------------------
                                                                                       
OPERATING INCOME                                                             582,074        575,925         577,878
- -------------------------------------------------------------------------------------------------------------------
                                                                                       
OTHER INCOME AND (DEDUCTIONS):                                                         
   Allowance for equity funds used during construction                         5,244          6,870           7,716
   Miscellaneous, net                                                        (10,344)       (21,229)        (22,975)
- -------------------------------------------------------------------------------------------------------------------
         TOTAL OTHER INCOME AND (DEDUCTIONS)                                  (5,100)       (14,359)        (15,259)
- -------------------------------------------------------------------------------------------------------------------
                                                                                       
INCOME BEFORE INTEREST CHARGES AND PREFERRED DIVIDENDS                       576,974        561,566         562,619
- -------------------------------------------------------------------------------------------------------------------
INTEREST CHARGES AND PREFERRED DIVIDENDS:                                              
   Interest                                                                  185,368        180,402         178,826
   Allowance for borrowed funds used during construction                      (7,462)        (7,490)         (6,179)
   Preferred dividends of subsidiaries                                        12,532         16,970          17,100
- -------------------------------------------------------------------------------------------------------------------
         NET INTEREST CHARGES AND PREFERRED DIVIDENDS                        190,438        189,882         189,747
- -------------------------------------------------------------------------------------------------------------------
                                                                                       
INCOME BEFORE EXTRAORDINARY CHARGE                                           386,536        371,684         372,872
- -------------------------------------------------------------------------------------------------------------------
EXTRAORDINARY CHARGE, NET OF INCOME TAXES (NOTE 2)                          (51,820)              -               -
- -------------------------------------------------------------------------------------------------------------------
NET INCOME                                                               $   334,716       $371,684     $   372,872
- -------------------------------------------------------------------------------------------------------------------
Earnings per Common Share - Basic and Diluted                                        
   (based on average shares outstanding)
   Income before extraordinary charge                                          $2.82          $2.71           $2.72
   Extraordinary charge                                                        $(.38)             -               -
- -------------------------------------------------------------------------------------------------------------------
   Net Income                                                                  $2.44          $2.71           $2.72
- -------------------------------------------------------------------------------------------------------------------
AVERAGE COMMON SHARES OUTSTANDING                                        137,215,462    137,215,462     137,215,462
</TABLE>



See Notes to Consolidated Financial Statements.



26
<PAGE>   11
Consolidated Statement Of Cash Flows

(Thousands of Dollars)
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------
Year ended December 31,                                                 1997             1996              1995
- ----------------------------------------------------------------------------------------------------------------
<S>                                                                  <C>              <C>              <C> 
CASH FLOWS FROM OPERATING:
   Income before extraordinary charge                                $ 386,536        $ 371,684        $ 372,872
   Adjustments to reconcile net income to net cash provided by
         operating activities:
      Depreciation and amortization                                    340,079          333,565          322,813
      Amortization of nuclear fuel                                      37,126           37,792           35,140
      Allowance for funds used during construction                     (12,706)         (14,360)         (13,895)
      Postretirement benefit accrual                                        --               --           11,923
      Deferred income taxes, net                                       (24,499)          12,665            4,003
      Deferred investment tax credits, net                             (18,967)          (9,531)          (9,542)
      Changes in assets and liabilities:
         Receivables, net                                               11,476          (25,468)         (21,229)
         Materials and supplies                                         16,523            2,376             (174)
         Accounts and wages payable                                     (3,626)           7,302          105,042
         Taxes accrued                                                  45,321            6,259           (7,085)
         Other                                                         (89,862)          63,816           (8,212)
- ----------------------------------------------------------------------------------------------------------------
NET CASH PROVIDED BY OPERATING ACTIVITIES                              687,401          786,100          791,656
- ----------------------------------------------------------------------------------------------------------------
CASH FLOWS FROM INVESTING:
   Construction expenditures                                          (380,593)        (435,904)        (429,839)
   Allowance for funds used during construction                         12,706           14,360           13,895
   Nuclear fuel expenditures                                           (35,432)         (51,176)         (42,444)
   Other                                                                16,122           (7,784)         (10,047)
- ----------------------------------------------------------------------------------------------------------------
NET CASH USED IN INVESTING ACTIVITIES                                 (387,197)        (480,504)        (468,435)
- ----------------------------------------------------------------------------------------------------------------
CASH FLOWS FROM FINANCING:
   Dividends on common stock                                          (331,282)        (326,855)        (319,875)
   Environmental bond funds                                                 --               --            4,443
   Redemptions -
      Nuclear fuel lease                                               (28,292)         (34,819)         (70,420)
      Short-term debt                                                       --          (18,300)          (6,100)
      Long-term debt                                                  (123,444)         (35,000)         (54,000)
      Preferred stock                                                  (63,924)             (26)             (26)
   Issuances -
      Nuclear fuel lease                                                40,337           43,884           49,134
      Short-term debt                                                   17,198            9,847           52,536
      Long-term debt                                                   187,000           65,194           19,766
- ----------------------------------------------------------------------------------------------------------------
NET CASH USED IN FINANCING ACTIVITIES                                 (302,407)        (296,075)        (324,542)
- ----------------------------------------------------------------------------------------------------------------

NET CHANGE IN CASH AND CASH EQUIVALENTS                                 (2,203)           9,521           (1,321)
- ----------------------------------------------------------------------------------------------------------------
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR                          11,899            2,378            3,699
- ----------------------------------------------------------------------------------------------------------------
CASH AND CASH EQUIVALENTS AT END OF YEAR                             $   9,696        $  11,899        $   2,378
- ----------------------------------------------------------------------------------------------------------------

Cash paid during the periods:
- ----------------------------------------------------------------------------------------------------------------
   Interest (net of amount capitalized)                              $ 162,459        $ 167,433        $ 173,569
   Income taxes                                                      $ 242,222        $ 248,096        $ 274,820
- ----------------------------------------------------------------------------------------------------------------
</TABLE>


SUPPLEMENTAL DISCLOSURE OF NONCASH TRANSACTION:

An extraordinary charge to earnings was recorded in the fourth quarter of 1997
for the write-off of generation-related regulatory assets and liabilities of the
Company's Illinois retail electric business as a result of electric industry
restructuring legislation enacted in Illinois in December 1997. The write-off
reduced earnings $52 million, net of income taxes. (See Note 2 - Regulatory
Matters for further information.)



See Notes to Consolidated Financial Statements.


                                              [AMEREN LOGO]          27
<PAGE>   12
Consolidated Statement Of Retained Earnings

(Thousands of Dollars)
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------
Year ended December 31,                 1997             1996             1995
- ---------------------------------------------------------------------------------
<S>                                  <C>              <C>              <C>       
Balance at Beginning of Period       $1,431,295       $1,385,629       $1,331,567
- ---------------------------------------------------------------------------------
   Add:
   Net income                           334,716          371,684          372,872
   Other                                     --              837            1,065
- ---------------------------------------------------------------------------------
                                        334,716          372,521          373,937
- ---------------------------------------------------------------------------------
   Deduct:
   Common stock cash dividends          331,282          326,855          319,875
   Other                                     71               --               --
- ---------------------------------------------------------------------------------
                                        331,353          326,855          319,875
- ---------------------------------------------------------------------------------
BALANCE AT CLOSE OF PERIOD           $1,434,658       $1,431,295       $1,385,629
- ---------------------------------------------------------------------------------
</TABLE>


Selected Quarterly Information

(Unaudited)

(Thousands of Dollars, Except per Share Amounts)

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------
QUARTER ENDED                Operating        Operating        Net Income    Earnings (Loss)
                              Revenues          Income           (Loss)        per Common
                                                                                Share
- --------------------------------------------------------------------------------------------
<S>                         <C>              <C>              <C>            <C>     
MARCH 31, 1997 (A)          $  759,663       $   95,461       $   44,977        $    .33
March 31, 1996 (a)             777,333          106,393           57,946             .42
- --------------------------------------------------------------------------------------------
JUNE 30, 1997 (B)              791,821          132,492           79,686             .58
June 30, 1996 (b)              785,297          123,668           72,616             .53
- --------------------------------------------------------------------------------------------
SEPTEMBER 30, 1997           1,043,137          269,093          215,423            1.57
September 30, 1996           1,018,214          267,812          217,073            1.58
- --------------------------------------------------------------------------------------------
DECEMBER 31, 1997 (C)          731,922           85,028           (5,370)           (.04)
December 31, 1996 (c)          747,577           78,052           24,049             .18
- --------------------------------------------------------------------------------------------
</TABLE>

(a) The first quarter of 1997 and 1996 included credits to Missouri electric
    customers which reduced net income approximately $7 million, or 5 cents per
    share, and $8 million, or 6 cents per share, respectively. In addition, a
    1.8% rate decrease effective August 1995 for Missouri electric customers
    reduced net income for the first quarter of 1996 $4 million, or 3 cents per
    share.

(b) The second quarter of 1997 and 1996 included credits to Missouri electric
    customers which reduced net income approximately $4 million, or 3 cents per
    share, and $18 million, or 14 cents per share, respectively. In addition,
    the 1995 rate decrease reduced net income for the second quarter of 1996 $5
    million, or 4 cents per share.

(c) The fourth quarter of 1997 included a net reversal of merger-related
    expenses of $17 million, or 13 cents per share. The fourth quarter of 1997
    also included an extraordinary charge of $52 million, net of income taxes,
    or 38 cents per share (see Note 2 - Regulatory Matters for further
    information). Callaway Plant refueling expenses, which decreased net income
    approximately $18 million, or 13 cents per share, were included in the
    fourth quarter of 1996.

   Other changes in quarterly earnings are due to the effect of weather on sales
   and other factors that are characteristic of public utility operations.



See Notes to Consolidated Financial Statements.



28
<PAGE>   13
                        Notes To Consolidated Financial Statements

   NOTE 1  -     MERGER AND BASIS OF PRESENTATION. Effective December 31, 1997,
  SUMMARY OF     following the receipt of all required state and federal
 SIGNIFICANT     regulatory approvals, Union Electric Company (AmerenUE) and
  ACCOUNTING     CIPSCO Incorporated (CIPSCO) combined to form Ameren
   POLICIES      Corporation (Ameren) (the Merger). The accompanying
                 consolidated financial statements (the financial statements)
                 reflect the accounting for the Merger as a pooling of interests
                 and are presented as if the companies were combined as of the
                 earliest period presented. However, the financial information
                 is not necessarily indicative of the results of operations,
                 financial position or cash flows that would have occurred had
                 the Merger been consummated for the periods for which it is
                 given effect, nor is it necessarily indicative of future
                 results of operations, financial position or cash flows. The
                 outstanding preferred stock of AmerenUE and Central Illinois
                 Public Service Company (AmerenCIPS), a subsidiary of CIPSCO,
                 was not affected by the Merger.

                    The accompanying financial statements include the accounts
                 of Ameren and its consolidated subsidiaries (collectively the
                 Company). All subsidiaries for which the Company owns directly
                 or indirectly more than 50% of the voting stock are included as
                 consolidated subsidiaries. Ameren's primary operating
                 companies, AmerenUE and AmerenCIPS, are engaged principally in
                 the generation, transmission, distribution and sale of electric
                 energy and the purchase, distribution, transportation and sale
                 of natural gas in the states of Missouri and Illinois. The
                 Company also has a non-regulated investing subsidiary, CIPSCO
                 Investment Company (CIC). Additionally, the Company has a 60%
                 interest in Electric Energy, Inc. (EEI). EEI owns and operates
                 an electric generating and transmission facility in Illinois
                 that supplies electric power primarily to a uranium enrichment
                 plant located in Paducah, Kentucky.

                    All significant intercompany balances and transactions have
                 been eliminated from the consolidated financial statements.

                    Operating revenues and net income for each of the years in
                 the three year period ended December 31, 1997, were as follows
                 (in millions):

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------
Year ended December 31, 1997:       AMERENUE        CIPSCO         OTHER        AMEREN
- ---------------------------------------------------------------------------------------
<S>                                 <C>            <C>            <C>           <C>    
Operating revenues                  $ 2,287        $   863        $   177       $ 3,327
Extraordinary charge                    (27)           (25)            --           (52)
Net income                              293             42             --           335
- ---------------------------------------------------------------------------------------
Year ended December 31, 1996:
- ---------------------------------------------------------------------------------------
Operating revenues                  $ 2,260        $   891        $   177       $ 3,328
Net income                              292             80             --           372
- ---------------------------------------------------------------------------------------
Year ended December 31, 1995:
- ---------------------------------------------------------------------------------------
Operating revenues                  $ 2,242        $   837        $   157       $ 3,236
Net income                              301             72             --           373
- ---------------------------------------------------------------------------------------
</TABLE>


                 REGULATION. Ameren is a registered holding company under the
                 Public Utility Holding Company Act of 1935 (PUHCA) and is
                 subject to regulation by the Securities and Exchange Commission
                 (SEC). AmerenUE is also regulated by the Missouri Public
                 Service Commission (MoPSC), Illinois Commerce Commission (ICC)
                 and the Federal Energy Regulatory Commission (FERC). AmerenCIPS
                 is also regulated by the ICC and the FERC. The accounting
                 policies of the Company conform to generally accepted
                 accounting principles (GAAP). (See Note 2 - Regulatory Matters
                 for further information.)

                 PROPERTY AND PLANT. The cost of additions to and betterments of
                 units of property and plant is capitalized. Cost includes
                 labor, material, applicable taxes and overheads, plus an
                 allowance for funds used during construction. Maintenance
                 expenditures and the renewal of items not considered units of
                 property are charged to income as incurred. When units of
                 depreciable property are retired, the original cost and removal
                 cost, less salvage, are charged to accumulated depreciation.

                 DEPRECIATION. Depreciation is provided over the estimated lives
                 of the various classes of depreciable property by applying
                 composite rates on a straight-line basis. The provision for
                 depreciation in 1997, 1996 and 1995 was approximately 3% of the
                 average depreciable cost.

                 FUEL AND GAS COSTS. In Illinois, changes in the cost of fuel
                 for electric generation and gas costs are generally reflected
                 in billings to customers through fuel and purchased gas
                 adjustment clauses. However, existing regulatory practice may
                 be modified in the Illinois retail jurisdiction for changes in
                 the cost of fuel for electric generation (see Note 2 -
                 Regulatory Matters for further information). In the Missouri
                 retail jurisdiction, the cost of fuel for electric generation
                 is reflected in base rates with no provision for changes to be
                 made through a fuel adjustment clause. Changes in gas costs in
                 the Missouri retail jurisdiction are generally reflected in
                 billings to customers through a purchased gas adjustment
                 clause.

                 NUCLEAR FUEL. The cost of nuclear fuel is amortized to fuel
                 expense on a unit-of-production basis. Spent fuel disposal cost
                 is charged to expense based on kilowatthours sold. 


                                                                              29
<PAGE>   14
                 CASH AND CASH EQUIVALENTS. Cash and cash equivalents include
                 cash on hand and temporary investments purchased with a
                 maturity of three months or less. 

                 INCOME TAXES. The Company and its subsidiaries file a
                 consolidated federal tax return. Deferred tax assets and
                 liabilities are recognized for the tax consequences of
                 transactions that have been treated differently for financial
                 reporting and tax return purposes, measured using statutory tax
                 rates.

                    Investment tax credits utilized in prior years were deferred
                 and are being amortized over the useful lives of the related
                 properties.

                 ALLOWANCE FOR FUNDS USED DURING CONSTRUCTION. Allowance for
                 funds used during construction (AFC) is a utility industry
                 accounting practice whereby the cost of borrowed funds and the
                 cost of equity funds (preferred and common stockholders'
                 equity) applicable to the Company's construction program are
                 capitalized as a cost of construction. AFC does not represent a
                 current source of cash funds. This accounting practice offsets
                 the effect on earnings of the cost of financing current
                 construction, and treats such financing costs in the same
                 manner as construction charges for labor and materials.

                 Under accepted rate-making practice, cash recovery of AFC, as
                 well as other construction costs, occurs when completed
                 projects are placed in service and reflected in customer rates.
                 The AFC ranges of rates used during 1997, 1996 and 1995 were
                 8.3% - 8.7%, 7.7% - 9.0% and 9.0% - 9.3%, respectively.

                 UNAMORTIZED DEBT DISCOUNT, PREMIUM AND EXPENSE. Discount,
                 premium and expense associated with long-term debt are
                 amortized over the lives of the related issues.

                 REVENUE. The Company accrues an estimate of electric and gas
                 revenues for service rendered but unbilled at the end of each
                 accounting period.

                 STOCK COMPENSATION PLANS. The Company applies Accounting
                 Principles Board Opinion No. 25, "Accounting for Stock Issued
                 to Employees" (APB 25) in accounting for its plans.

                 LONG-LIVED ASSETS. Statement of Financial Accounting Standards
                 (SFAS) No. 121, "Accounting for the Impairment of Long-Lived
                 Assets and for Long-Lived Assets to be Disposed Of" became
                 effective on January 1, 1996. SFAS 121 prescribes general
                 standards for the recognition and measurement of impairment
                 losses. SFAS 121 requires that regulatory assets which are no
                 longer probable of recovery through future revenues be charged
                 to earnings (see Note 2 - Regulatory Matters for further
                 information).

                 EARNINGS PER SHARE. SFAS No. 128, "Earnings per Share" became
                 effective on January 1, 1997. SFAS 128 established standards
                 for computing and presenting earnings per share (EPS) on a
                 basic and diluted basis (see Note 9 - Stock Options for further
                 information). SFAS 128 did not have an impact on the financial
                 position, results of operations or liquidity of the Company
                 upon adoption.

                 USE OF ESTIMATES. The preparation of financial statements in
                 conformity with GAAP requires management to make certain
                 estimates and assumptions. Such estimates and assumptions may
                 affect reported amounts of assets and liabilities and
                 disclosure of contingent assets and liabilities at the date of
                 the financial statements and the reported amounts of revenues
                 and expenses during the reported period. Actual results could
                 differ from those estimates.

                 RECLASSIFICATIONS. Certain reclassifications have been made to
                 prior-years financial statements to conform with 1997
                 reporting.


  NOTE 2 -       In July 1995, the MoPSC approved an agreement involving the
 REGULATORY      Company's Missouri retail electric rates. The agreement
  MATTERS        decreased rates 1.8% for all classes of Missouri retail
                 electric customers, effective August 1, 1995, reducing annual
                 revenues about $30 million and reducing annual earnings
                 approximately 13 cents per share. In addition, a one-time $30
                 million credit to retail Missouri electric customers reduced
                 1995 earnings approximately 13 cents per share. Also included
                 was a three-year experimental alternative regulation plan that
                 runs from July 1,1995 through June 30, 1998, which provides
                 that earnings in any future years in excess of a 12.61%
                 regulatory return on equity (ROE) will be shared equally
                 between customers and stockholders, and earnings above a 14%
                 ROE will be credited to customers. The formula for computing
                 the credit uses twelve-month results ending June 30, rather
                 than calendar year earnings. The agreement also provides that
                 no party shall file for a general increase or decrease in the
                 Company's Missouri retail electric rates prior to July 1, 1998,
                 except that the Company may file for an increase if certain
                 adverse events occur. During 1997, the Company recorded a $20
                 million credit for the second year of the plan, which reduced
                 earnings $11 million, or 8 cents per share. During 1996, the
                 Company recorded a $47 million credit, which reduced earnings
                 $28 million, or 20 cents per share. These credits were
                 reflected as reductions in electric revenues.

                    Included in the joint agreement approved by the MoPSC in its
                 February 1997 order authorizing the Merger, is a new three-year
                 experimental alternative regulation plan that will run from
                 July 1, 1998 through June 30, 2001. Like the current plan, the
                 new plan requires that earnings over a 12.61% ROE up to a 14%
                 ROE will be shared equally between customers and stockholders.
                 The new three-year plan will also return to customers 90% of
                 all earnings above a 14% ROE up to a 16% ROE. Earnings above a
                 16% ROE would be credited entirely to customers. Other
                 agreement provisions include: recovery within a 10-year period
                 of the merger-related expenses applicable to the Missouri
                 retail jurisdiction; a Missouri electric rate decrease,
                 effective September 1, 1998, based on the weather-adjusted
                 average annual credits to customers under the current
                 experimental alternative regulation plan; and an experimental
                 retail wheeling pilot program for 100


30
<PAGE>   15
                 megawatts of electric power. Also, as part of the agreement,
                 the Company did not seek to recover in Missouri the merger
                 premium. The exclusion of the merger premium from rates did not
                 result in a charge to earnings.

                    In September 1997, the ICC approved the Merger subject to
                 certain conditions. The conditions included the requirement for
                 AmerenUE and AmerenCIPS to file electric and gas rate cases or
                 alternative regulatory plans within six months after the Merger
                 became final to determine how net merger savings would be
                 shared between the ratepayers and stockholders.
 
                    In December 1997, the Governor of Illinois signed the
                 Electric Service Customer Choice and Rate Relief Law of 1997
                 (the Act) providing for electric utility restructuring in
                 Illinois. This legislation introduces competition into the
                 supply of electric energy in Illinois. The Act includes a 5%
                 rate decrease for the Company's Illinois residential electric
                 customers, effective August 1, 1998. The Company may be subject
                 to additional 5% residential electric rate decreases in each of
                 2000 and 2002 to the extent its rates exceed the Midwest
                 utility average at that time. The Company's rates are currently
                 below the Midwest utility average. The Company estimates that
                 the initial 5% rate decrease will result in a decrease in
                 annual electric revenues of about $13 million, based on
                 estimated levels of sales and assuming normal weather
                 conditions. Retail direct access, which allows customers to
                 choose their electric generation supplier, will be phased in
                 over several years. Access for commercial and industrial
                 customers will occur over a period from October 1999 to
                 December 2000, and access for residential customers will occur
                 after May 1, 2002. The Act also relieves the Company of the
                 requirement in the ICC's September 1997 Order (which approved
                 the Merger), requiring AmerenUE and AmerenCIPS to file electric
                 rate cases or alternative regulatory plans in Illinois
                 following consummation of the Merger to reflect the effects of
                 net merger savings. Other provisions of the Act include (1)
                 potential recovery of a portion of stranded costs through a
                 transition charge collected from customers who choose another
                 electric supplier, (2) the option to eliminate the uniform fuel
                 adjustment clause (FAC) and to roll into base rates a
                 historical level of fuel expense and (3) a mechanism to
                 securitize certain future revenues.

                    The Company's accounting policies and financial statements
                 conform to GAAP applicable to rate-regulated enterprises and
                 reflect the effects of the ratemaking process in accordance
                 with SFAS No. 71, "Accounting for the Effects of Certain Types
                 of Regulation." Such effects concern mainly the time at which
                 various items enter into the determination of net income in
                 order to follow the principle of matching costs and revenues.
                 For example, SFAS 71 allows the Company to record certain
                 assets and liabilities (regulatory assets and regulatory
                 liabilities) which are expected to be recovered or settled in
                 future rates and would not be recorded under GAAP for
                 nonregulated entities. In addition, reporting under SFAS 71
                 allows companies whose service obligations and prices are
                 regulated to maintain assets on their balance sheets
                 representing costs they reasonably expect to recover from
                 customers, through inclusion of such costs in future rates.
                 SFAS 101, "Accounting for the Discontinuance of Application of
                 FASB Statement No. 71," specifies how an enterprise that ceases
                 to meet the criteria for application of SFAS 71 for all or part
                 of its operations should report that event in its financial
                 statements. In general, SFAS 101 requires that the enterprise
                 report the discontinuance of SFAS 71 by eliminating from its
                 balance sheet all regulatory assets and liabilities related to
                 the portion of the business which no longer meets the SFAS 71
                 criteria. At its July 24, 1997 meeting, the Emerging Issues
                 Task Force of the Financial Accounting Standards Board (EITF)
                 concluded that application of SFAS 71 accounting should be
                 discontinued once sufficiently detailed deregulation
                 legislation is issued for a separable portion of a business for
                 which a plan of deregulation has been established. However, the
                 EITF further concluded that regulatory assets associated with
                 the deregulated portion of the business, which will be
                 recovered through tariffs charged to customers of a regulated
                 portion of the business, should be associated with the
                 regulated portion of the business from which future cash
                 recovery is expected (not the portion of the business from
                 which the costs originated), and can therefore continue to be
                 carried on the regulated entity's balance sheet to the extent
                 such assets are recovered. In addition, SFAS 121 establishes
                 accounting standards for the impairment of long-lived assets
                 (see Note 1 - Summary of Significant Accounting Policies for
                 further information).

                    Due to the enactment of the Act, prices for the retail
                 supply of electric generation are expected to transition from
                 cost-based, regulated rates to rates determined in large part
                 by competitive market forces in the state of Illinois. As a
                 result, the Company discontinued application of SFAS 71 for the
                 Illinois retail portion of its generating business (i.e., the
                 portion of the Company's business related to the supply of
                 electric energy in Illinois) in the fourth quarter of 1997. The
                 Company has evaluated the impact of the Act on the future
                 recoverability of its regulatory assets and liabilities related
                 to the generation portion of its business and has determined
                 that it is not probable that such assets and liabilities will
                 be recovered through the cash flows from the regulated portion
                 of its business. Accordingly, the Company's generation-related
                 regulatory assets and liabilities of its Illinois retail
                 electric business were written off in the fourth quarter of
                 1997, resulting in an extraordinary charge to earnings of $52
                 million, net of income taxes, or 38 cents per share. These
                 regulatory assets and liabilities included previously incurred
                 costs originally expected to be collected/refunded in future
                 revenues, such as fuel contract restructuring costs, deferred
                 charges related to a generating plant, costs associated with an
                 abandoned scrubber at a fossil plant, and income tax-related
                 regulatory assets and liabilities. In addition, the Company has
                 evaluated whether the recoverability of the costs associated
                 with its remaining net generation-related assets have been
                 impaired as defined under SFAS 121. The Company has concluded
                 that impairment, as defined under SFAS 121, does not exist and
                 that no plant write-downs are necessary at 



                                                                              31
<PAGE>   16
                 this time. At December 31, 1997, the Company's net investment
                 in generation facilities related to its Illinois retail
                 jurisdiction approximated $836 million and was included in
                 electric plant in-service on the Company's consolidated balance
                 sheet.

                    The provisions of the Act could also result in lower
                 revenues, reduced profit margins and increased costs of
                 capital. At this time, the Company is unable to determine the
                 impact of the Act on its future financial condition, results of
                 operations or liquidity.
  
                    In Missouri, where approximately 72% of the Company's retail
                 electric revenues are derived, a task force appointed by the
                 MoPSC is conducting studies of electric industry restructuring
                 and competition and is expected to issue a report to the MoPSC
                 in 1998. A joint legislative committee is also conducting
                 studies and is expected to report its findings and
                 recommendations to the Missouri General Assembly. Up to this
                 point, retail wheeling has not been allowed in Missouri;
                 however, the joint agreement approved by the MoPSC in February
                 1997 as part of its merger authorization includes a provision
                 that required AmerenUE to file a proposal for a 100-megawatt
                 experimental retail wheeling pilot program in Missouri.
                 AmerenUE filed its proposal with the MoPSC in September 1997.
                 This proposal is subject to review and approval by the MoPSC.

                    The Company is unable to predict the timing or ultimate
                 outcome of electric industry restructuring in the state of
                 Missouri, as well as its impact on the Company's future
                 financial condition, results of operations or liquidity. The
                 potential negative consequences of electric industry
                 restructuring could be significant and include the impairment
                 and write-down of certain assets, including generation-related
                 plant and net regulatory assets, lower revenues, reduced profit
                 margins and increased costs of capital. At December 31, 1997,
                 the Company's net investment in generation facilities related
                 to its Missouri jurisdiction approximated $2.7 billion and was
                 included in electric plant in-service on the Company's
                 consolidated balance sheet. In addition, at December 31, 1997,
                 the Company's Missouri net generation-related regulatory assets
                 approximated $462 million.

                    In accordance with SFAS 71, the Company has deferred certain
                 costs pursuant to actions of its regulators, and is currently
                 recovering such costs in electric rates charged to customers.

                    At December 31, the Company had recorded the following
                 regulatory assets and regulatory liability:

<TABLE>
<CAPTION>
                 -----------------------------------------------------------------------
                 (in millions)                                        1997          1996
                 -----------------------------------------------------------------------
<S>                                                                   <C>           <C> 
                 REGULATORY ASSETS:
                    Income taxes                                      $640          $734
                    Callaway costs                                      99           111
                    Undepreciated plant costs                          --             41
                    Unamortized loss on reacquired debt                 32            42
                    DOE decommissioning assessment                      15            18
                    Deferred environmental remediation costs            13            11
                    Merger costs                                        28           --
                    Other                                               18            21
                 -----------------------------------------------------------------------
                 Regulatory Assets                                    $845          $978
                 -----------------------------------------------------------------------
                 REGULATORY LIABILITY:
                    Income taxes                                      $224          $304
                 -----------------------------------------------------------------------
                 Regulatory Liability                                 $224          $304
                 -----------------------------------------------------------------------
</TABLE>

                 INCOME TAXES: See Note 7 - Income Taxes.

                 CALLAWAY COSTS: Represents Callaway Nuclear Plant operations
                 and maintenance expenses, property taxes and carrying costs
                 incurred between the plant in-service date and the date the
                 plant was reflected in rates. These costs are being amortized
                 over the remaining life of the plant (through 2024).

                 UNDEPRECIATED PLANT COSTS: Represents the unamortized cost of a
                 generating plant's scrubber plus costs of removal.

                 UNAMORTIZED LOSS ON REACQUIRED DEBT: Represents losses related
                 to refunded debt. These amounts are being amortized over the
                 lives of the related new debt issues or the remaining lives of
                 the old debt issues if no new debt was issued.

                 DEPARTMENT OF ENERGY (DOE) DECOMMISSIONING ASSESSMENT:
                 Represents fees assessed by the DOE to decommission its uranium
                 enrichment facility. These costs are being amortized through
                 2007 as payments are made to the DOE.

                 DEFERRED ENVIRONMENTAL REMEDIATION COSTS: Represents costs, net
                 of recoveries from insurers, relating to studies and
                 remediation at manufactured gas sites which are recovered
                 through environmental rate riders. (See Note 10 - Commitments
                 and Contingencies for further information.)

                 MERGER COSTS: Represents the portion of merger-related expenses
                 applicable to the Missouri retail jurisdiction. These costs are
                 being amortized within 10 years, based on a MoPSC order.

                    The Company continually assesses the recoverability of its
                 regulatory assets. Under current accounting standards,
                 regulatory assets are written off to earnings when it is no
                 longer probable that


32
<PAGE>   17
                 such amounts will be recovered through future revenues.
                 However, as noted in the above paragraphs, electric industry
                 restructuring legislation may impact the recoverability of
                 regulatory assets in the future.

                    In April 1996, the FERC issued Order 888 and Order 889
                 related to the industry's wholesale electric business. In
                 January 1998, the Company filed a combined open access tariff
                 which conforms to the FERC's orders.


NOTE 3 -         The Company has a lease agreement which provides for the
NUCLEAR          financing of nuclear fuel. At December 31, 1997, the maximum
FUEL LEASE       amount that could be financed under the agreement was $120
                 million. Pursuant to the terms of the lease, the Company has
                 assigned to the lessor certain contracts for purchase of
                 nuclear fuel. The lessor obtains, through the issuance of
                 commercial paper or from direct loans under a committed
                 revolving credit agreement from commercial banks, the necessary
                 funds to purchase the fuel and make interest payments when due.

                    The Company is obligated to reimburse the lessor for all
                 expenditures for nuclear fuel, interest and related costs.
                 Obligations under this lease become due as the nuclear fuel is
                 consumed at the Company's Callaway Nuclear Plant. The Company
                 reimbursed the lessor $31 million during 1997, $37 million
                 during 1996 and $34 million during 1995.

                    The Company has capitalized the cost, including certain
                 interest costs, of the leased nuclear fuel and has recorded the
                 related lease obligation. During each of the years 1997, 1996
                 and 1995, the total interest charges under the lease were $6
                 million (based on average interest rates of 5.8%, 5.7% and
                 6.1%, respectively) of which $3 million was capitalized in each
                 respective year.

   NOTE 4 -      At December 31, 1997 and 1996, AmerenUE and AmerenCIPS had
   PREFERRED     25 million shares and 4.6 million shares, respectively, of
    STOCK OF     authorized preferred stock.
SUBSIDIARIES
                    In 1997, AmerenUE redeemed $64 million of preferred stock
                 (see note (b) in table below). AmerenUE retired 260 shares,
                 $6.30 Series preferred stock in 1996.

                 Outstanding preferred stock is redeemable at the redemption
                 prices shown below (in millions):

<TABLE>
<CAPTION>
                        -----------------------------------------------------------------------------------------------------
                        December 31,                                                                     1997            1996
                        -----------------------------------------------------------------------------------------------------
                        PREFERRED STOCK NOT SUBJECT TO MANDATORY REDEMPTION:
                        -----------------------------------------------------------------------------------------------------
                        <S>                                                                              <C>           <C>
                        Preferred stock outstanding (entitled to cumulative dividends)
                                                                       Redemption Price (per share)
                        Without par value and stated value of $100 per share  --
                           $7.64 Series  - 330,000 shares             $103.82 - note (a)                 $  33          $  33
                           $7.44 Series  - 330,001 shares              101.00 - note (b)                    --             33
                           $6.40 Series  - 300,000 shares              101.50 - note (b)                    --             30
                           $5.50 Series A  - 14,000 shares             110.00                                1              1
                           $4.75 Series  - 20,000 shares               102.176                               2              2
                           $4.56 Series  - 200,000 shares              102.47                               20             20
                           $4.50 Series  - 213,595 shares              110.00 - note (c)                    21             21
                           $4.30 Series  - 40,000 shares               105.00                                4              4
                           $4.00 Series  - 150,000 shares              105.625                              15             15
                           $3.70 Series  - 40,000 shares               104.75                                4              4
                           $3.50 Series  - 130,000 shares              110.00                               13             13

                        With par value of $100 per share  --
                           4.00% Series  - 150,000 shares              101.00                               15             15
                           4.25% Series  - 50,000 shares               102.00                                5              5
                           4.90% Series  - 75,000 shares               102.00                                8              8
                           4.92% Series  - 50,000 shares               103.50                                5              5
                           5.16% Series  - 50,000 shares               102.00                                5              5
                           1993 Auction  - 300,000 shares              100.00 - note (d)                    30             30
                           6.625% Series - 125,000 shares              100.00 - note (e)                    12             12

                        Without par value and stated value of $25 per share  --
                           $1.735 Series - 1,657,500 shares            25.00   - note (f)                   42             42
                        -----------------------------------------------------------------------------------------------------
                        TOTAL PREFERRED STOCK NOT SUBJECT TO MANDATORY REDEMPTION                         $235           $298
                        -----------------------------------------------------------------------------------------------------
                        PREFERRED STOCK SUBJECT TO MANDATORY REDEMPTION:
                        -----------------------------------------------------------------------------------------------------
                        Preferred stock outstanding without par value (entitled
                        to cumulative dividends)
                           Stated value of $100 per share --
                           $6.30 Series   -  0 and 6,240 shares
                              at respective dates                     $100.00 - note (b)                  $ --           $  1
                        -----------------------------------------------------------------------------------------------------
                        TOTAL PREFERRED STOCK SUBJECT TO MANDATORY REDEMPTION                             $ --           $  1
                        =====================================================================================================
</TABLE>

                        (a)   Beginning February 15, 2003, eventually declining
                              to $100 per share.
                        (b)   AmerenUE redeemed this series in 1997.
                        (c)   In the event of voluntary liquidation, $105.50.
                        (d)   Dividend rates, and the periods during which such
                              rates apply, vary depending on the Company's
                              selection of certain defined dividend period
                              lengths. The average dividend rate during 1997 was
                              3.98%.
                        (e)   Not redeemable prior to October 1, 1998.
                        (f)   Not redeemable prior to August 1, 1998.



                                                                              33
<PAGE>   18
  NOTE 5 -       Short-term borrowings of the Company consist of bank loans
SHORT-TERM       (maturities generally on an overnight basis) and commercial
BORROWINGS       paper (maturities generally within 10-45 days). At December 31,
                 1997 and 1996, $86 million and $69 million, repectively, of
                 short-term borrowings were outstanding. The weighted average
                 interest rates on borrowings outstanding at December 31, 1997
                 and 1996, were 6.5% and 6.4%, respectively.

                   At December 31, 1997, the Company had committed bank lines of
                 credit aggregating $259 million (of which $244 million were
                 unused and $179 million were available) which make available
                 interim financing at various rates of interest based on LIBOR,
                 the bank certificate of deposit rate, or other options. These
                 lines of credit are renewable annually at various dates
                 throughout the year.

<TABLE>
<CAPTION>
     NOTE 6 -           Long-term debt outstanding at December 31,                                       1997           1996
 LONG-TERM DEBT         ----------------------------------------------------------------------------------------------------  
 OF SUBSIDIARIES          (in millions)
                        ----------------------------------------------------------------------------------------------------
                        First Mortgage Bonds - note (a)
                        ----------------------------------------------------------------------------------------------------
<S>                                                                                                     <C>          <C>
                           5 1/2% Series paid in 1997                                                   $  --        $    40
                           6 1/8% Series X paid in 1997                                                    --             43
                           6 3/4% Series due 1999                                                         100            100
                           7 1/8% Series W due 1999                                                        50             50
                           8.33% Series due 2002                                                           75             75
                           6 3/8% Series Z due 2003                                                        40             40
                           7.65% Series due 2003                                                          100            100
                           6 7/8% Series due 2004                                                         188            188
                           7 3/8% Series due 2004                                                          85             85
                           7 1/2% Series X due 2007                                                        50             50
                           6 3/4% Series due 2008                                                         148            148
                           7.61% 1997 Series due 2017                                                      40            --
                           7.40% Series due 2020 - note (b)                                                60             60
                           8 3/4% Series due 2021                                                         125            125
                           8% Series due 2022                                                              85             85
                           8 1/4% Series due 2022                                                         104            104
                           7.15% Series due 2023                                                           75             75
                           7% Series due 2024                                                             100            100
                           5.45% Series due 2028 - note (b)                                                44             44
                           Other 6% - 8.5% due 1999 through 2022                                          186            121
                        ----------------------------------------------------------------------------------------------------
                                                                                                        1,655          1,633
                        ----------------------------------------------------------------------------------------------------
                        Environmental Improvement/Pollution Control Revenue Bonds
                        ----------------------------------------------------------------------------------------------------
                           1984 Series A due 2014 - note (c)                                               80             80
                           1984 Series B due 2014 - note (c)                                               80             80
                           1985 Series A due 2015 - note (d)                                               70             70
                           1985 Series B due 2015 - note (d)                                               57             57
                           1990 Series B 7.60% due 2013                                                    32             32
                           1991 Series due 2020 - note (d)                                                 43             43
                           1992 Series due 2022 - note (d)                                                 47             47
                           1993 Series A 6 3/8% due 2028                                                   35             35
                           1993 Series C-1 due 2026 - note (e)                                             35             35
                           Other 4.375% - 7.6% due 2014 through 2028                                       80             80
                        ----------------------------------------------------------------------------------------------------
                                                                                                          559            559
                        ----------------------------------------------------------------------------------------------------
                        Subordinated Deferrable Interest Debentures
                        ----------------------------------------------------------------------------------------------------
                           7.69% Series A due 2036 - note (f)                                              66             66
                        ----------------------------------------------------------------------------------------------------
                        Unsecured Loans
                        ----------------------------------------------------------------------------------------------------
                           Commercial paper - note (g)                                                     35            --
                           Credit agreements - note (h)                                                    21            --
                           1991 Senior Medium Term Notes 8.60% due through 2005                            54             60
                           1994 Senior Medium Term Notes 6.61% due through 2005                            62             70
                        ----------------------------------------------------------------------------------------------------
                                                                                                          172            130
                        ----------------------------------------------------------------------------------------------------
                        Nuclear Fuel Lease                                                                117            106
                        ----------------------------------------------------------------------------------------------------
                        Unamortized Discount and Premium on Debt                                          (11)           (13)
                        ----------------------------------------------------------------------------------------------------
                        Maturities Due Within One Year                                                    (52)          (146)
                        ----------------------------------------------------------------------------------------------------
                        TOTAL LONG-TERM DEBT                                                           $2,506         $2,335
                        ====================================================================================================
</TABLE>

                 (a) At December 31, 1997, substantially all of the property and
                     plant was mortgaged under, and subject to liens of, the
                     respective indentures pursuant to which the bonds were
                     issued.

                 (b) Environmental Improvement Series

                 (c) On June 1 of each year, the interest rate is established
                     for the following year, or alternatively at the option of
                     the Company, may be fixed until maturity. A per annum rate
                     of 3.95% is effective for the year ended May 31, 1998.
                     Thereafter, the interest rates will depend on market
                     conditions and the selection of an annual versus remaining
                     life rate by the Company. The average interest rate for the
                     year 1997 was 3.83%.

                 (d) Interest rates, and the periods during which such rates
                     apply, vary depending on the Company's selection of certain
                     defined rate modes. The average interest rates for the year
                     1997, for 1985 Series A, 1985 Series B, 1991 Series and
                     1992 Series bonds were 3.61%, 3.82%, 3.86%, and 3.83%,
                     respectively.



34
<PAGE>   19
                 (e) The interest rate for the year 1997 was 4.20%. This
                     interest rate will be adjusted to a then-current market
                     rate on August 15, 1998. Actual interest rates, and the
                     periods during which such rates apply, vary depending on
                     the Company's selection of certain defined rate modes.

                 (f) During the terms of the debentures, the Company may, under
                     certain circumstances, defer the payment of interest for up
                     to five years.

                 (g) A bank credit agreement, due 1999, permits the Company to
                     borrow or to support commercial paper borrowings up to $300
                     million. Interest rates will vary depending on market
                     conditions. At December 31, 1997, the outstanding
                     commercial paper was at an average annualized rate of
                     5.93%.

                 (h) Bank credit agreements, due 2002, permit the Company to
                     borrow up to $42 million. Interest rates vary depending on
                     market conditions and the Company's selection of various
                     options under the agreements. At December 31, 1997, the
                     average annualized interest rate was 6.15%.

                 (i) A bank credit agreement, due 1999, permits the Company to
                     borrow up to $200 million. Interest rates will vary
                     depending on market conditions and the Company's selection
                     of various options under the agreement. At December 31,
                     1997, no such borrowings were outstanding.

                 Maturities of long-term debt through 2002 are as follows:
                       <TABLE>
                       <CAPTION>
                       (in millions)                          Principal Amount
                       -------------------------------------------------------
                       <S>                                               <C>
                       1998                                              $  52
                       1999                                                209
                       2000                                                 49
                       2001                                                 44
                       2002                                                134
                       =======================================================
                       </TABLE>

                 Amounts for years subsequent to 1998 do not include nuclear 
                 fuel lease payments since the amounts of such payments are not
                 currently determinable.

   NOTE 7 -      Total income tax expense for 1997 resulted in an effective tax
 INCOME TAXES    rate of 38% on earnings before income taxes (40% in each of 
                 1996 and 1995).
                       
                 Principal reasons such rates differ from the statutory federal
                 rate:

<TABLE>
<CAPTION>
                 ------------------------------------------------------------------------------------------------------
                                                                                    1997           1996            1995
                 ------------------------------------------------------------------------------------------------------
<S>                                                                                       <C>            <C>             <C>
                 STATUTORY FEDERAL INCOME TAX RATE:                                  35%            35%             35%
                 Increases (Decreases) from:
                    Depreciation differences                                          1              1               1
                    State tax                                                         4              4               4
                    Other                                                            (2)            --              --
                 ------------------------------------------------------------------------------------------------------
                 EFFECTIVE INCOME TAX RATE                                           38%            40%             40%
                 ======================================================================================================
                 Income tax expense components:
                 ------------------------------------------------------------------------------------------------------
                 (in millions)                                                     1997           1996            1995
                 ------------------------------------------------------------------------------------------------------
                 TAXES CURRENTLY PAYABLE (PRINCIPALLY FEDERAL):
                 Included in operating expenses                                    $261           $255            $267
                 Included in other income -- Miscellaneous, net                      --             --              (1)
                 ------------------------------------------------------------------------------------------------------
                                                                                    261            255             266
                 DEFERRED TAXES (PRINCIPALLY FEDERAL):
                 Included in operating expenses --
                    Depreciation differences                                        (11)             2              10
                    Postretirement benefits                                          --              --             (9)
                    Other                                                            (7)             5               2
                 Included in other income --
                    Depreciation differences                                         --              1               1
                    Other                                                            10             --              --
                 -----------------------------------------------------------------------------------------------------
                                                                                     (8)             8               4
                 DEFERRED INVESTMENT TAX CREDITS, AMORTIZATION:
                 Included in operating expenses                                      (9)            (9)             (9)
                 ------------------------------------------------------------------------------------------------------
                 TOTAL INCOME TAX EXPENSE                                          $244           $254            $261
                 ======================================================================================================
</TABLE>

                           In accordance with SFAS 109, "Accounting for Income
                  Taxes," a regulatory asset, representing the probable recovery
                  from customers of future income taxes, which is expected to
                  occur when temporary differences reverse, was recorded along
                  with a corresponding deferred tax liability. Also, a
                  regulatory liability, recognizing the lower expected revenue
                  resulting from reduced income taxes associated with amortizing
                  accumulated deferred investment tax credits, was recorded.
                  Investment tax credits have been deferred and will continue to
                  be credited to income over the lives of the related property.

                           The Company adjusts its deferred tax liabilities for
                  changes enacted in tax laws or rates. Recognizing that 
                  regulators will probably reduce future revenues for deferred
                  tax liabilities initially recorded at rates in excess of the
                  current statutory rate, reductions in the deferred tax
                  liability were credited to the regulatory liability.



                                                                              35
<PAGE>   20
                        Temporary differences gave rise to the following 
                        deferred tax assets and deferred tax liabilities at 
                        December 31:
<TABLE>
<CAPTION>
                        ------------------------------------------------------------------------------------
                        (in millions)                                                    1997           1996
                        ------------------------------------------------------------------------------------
<S>                                                                                     <C>           <C>
                        ACCUMULATED DEFERRED INCOME TAXES:
                           Depreciation                                                 $1,045        $1,070
                           Regulatory assets, net                                          451           488
                           Capitalized taxes and expenses                                  176           210
                           Deferred benefit costs                                          (46)          (48)
                           Regulatory liabilities, net                                     (42)          (46)
                           Other                                                             9            23
                        ------------------------------------------------------------------------------------
                        TOTAL NET ACCUMULATED DEFERRED INCOME TAX LIABILITIES           $1,593        $1,697
                        ------------------------------------------------------------------------------------
</TABLE>


    NOTE 8 -            The Company has defined-benefit retirement plans
  RETIREMENT            covering substantially all of its employees. Benefits
   BENEFITS             are based on the employees' years of service and
                        compensation. The Company's plans are funded in
                        compliance with income tax regulations and federal
                        funding requirements.

                        Following is the pension plan information related to
                        AmerenUE's plans as of December 31: 

                        Pension costs for the years 1997, 1996 and 1995, were
                        $24 million, $28 million and $26 million, respectively,
                        of which approximately 17%, 19% and 20%, respectively
                        was charged to construction accounts.


<TABLE>
<CAPTION>
         FUNDED STATUS OF PENSION PLANS:
         -----------------------------------------------------------------------------------------------------------------------  
         (in millions)                                                                     1997            1996            1995
         -----------------------------------------------------------------------------------------------------------------------  
<S>                                                                                      <C>             <C>             <C>
         ACTUARIAL PRESENT VALUE OF BENEFIT OBLIGATION:
            Vested benefit obligation                                                    $   705         $   661         $   679
         -----------------------------------------------------------------------------------------------------------------------  
            Accumulated benefit obligation                                               $   829         $   752         $   758
         -----------------------------------------------------------------------------------------------------------------------  
            Projected benefit obligation for service rendered to date                    $   999         $   919         $   913
            Less: Plan assets at fair value*                                               1,006             924             847
         -----------------------------------------------------------------------------------------------------------------------  
         (Excess) Deficiency of plan assets versus
            projected benefit obligation                                                      (7)             (5)             66
         Unrecognized net gain                                                               115              96              22
         Unrecognized prior service cost                                                     (69)            (76)            (82)
         Unrecognized net assets at transition                                                 7               8               9
         -----------------------------------------------------------------------------------------------------------------------  
         ACCRUED PENSION COST AT DECEMBER 31                                             $    46         $    23         $    15
         -----------------------------------------------------------------------------------------------------------------------  
         * Plan assets consist principally of common stocks and fixed income securities 
         
         COMPONENTS OF NET PENSION EXPENSE:
         -----------------------------------------------------------------------------------------------------------------------  
         (in millions)                                                                      1997            1996            1995
         -----------------------------------------------------------------------------------------------------------------------  
         Service cost - benefits earned during the period                                $    22         $    22         $    19
         Interest cost on projected benefit obligation                                        69              65              66
         Actual return on plan assets                                                       (134)           (107)           (166)
         Net amortization and deferral                                                        67              48             107
         -----------------------------------------------------------------------------------------------------------------------  
         PENSION COST                                                                    $    24         $    28         $    26
         ----------------------------------------------------------------------------------------------------------------------- 

         ASSUMPTIONS FOR ACTUARIAL PRESENT VALUE OF PROJECTED BENEFIT OBLIGATIONS:
         -----------------------------------------------------------------------------------------------------------------------  
                                                                                            1997            1996            1995
         -----------------------------------------------------------------------------------------------------------------------  
         Discount rate at measurement date                                                   7.0%            7.5%           7.25%
         Increase in future compensation                                                     4.0%            4.5%           4.25%
         Plan assets long-term rate of return                                                8.5%            8.5%            8.5%
         -----------------------------------------------------------------------------------------------------------------------  
</TABLE>



36
<PAGE>   21
                    AmerenCIPS uses a September 30 measurement date for its
                 valuation of pension plan assets and liabilities. Following is
                 the pension plan information related to AmerenCIPS' plan as of
                 December 31:

                    Pension costs for the years 1997, 1996 and 1995, were $5
                 million, $4 million and $6 million, respectively, of which
                 approximately 15% in 1997 and 1996 and 18% in 1995 was charged
                 to construction accounts.

<TABLE>
<CAPTION>
                 FUNDED STATUS OF PENSION PLAN:
                 -----------------------------------------------------------------------------------------------------
                 (in millions)                                                        1997          1996          1995
                 -----------------------------------------------------------------------------------------------------
<S>                                                                                  <C>           <C>           <C>
                 ACTUARIAL PRESENT VALUE OF BENEFIT OBLIGATION:
                     Vested benefit obligation                                       $ 164         $ 148         $ 121         
                 -----------------------------------------------------------------------------------------------------
                     Accumulated benefit obligation                                  $ 190         $ 171         $ 142
                 -----------------------------------------------------------------------------------------------------
                     Projected benefit obligation for service rendered to date       $ 234         $ 211         $ 181
                     Less: Plan assets at fair value*                                  315           253           221
                 -----------------------------------------------------------------------------------------------------
                  (Excess) of plan assets versus projected
                     benefit obligation                                                (81)          (42)          (40)
                  Unrecognized net gain                                                 76            40            33
                  Unrecognized prior service cost                                      (11)          (11)           (5)
                  Unrecognized net assets at transition                                  3             3             4
                 -----------------------------------------------------------------------------------------------------
                  Prepaid pension costs at September 30                                (13)          (10)           (8)
                  Expense, net of funding October to December                           (2)           (1)           --
                 -----------------------------------------------------------------------------------------------------
                  PREPAID PENSION COST AT DECEMBER 31                                $ (15)        $ (11)        $  (8)
                 -----------------------------------------------------------------------------------------------------
                  * Plan assets consist principally of common and preferred
                    stocks, bonds, money market instruments and real estate. 
                  
                  COMPONENTS OF NET PENSION EXPENSE:
                 -----------------------------------------------------------------------------------------------------
                  (in millions)                                                       1997          1996          1995
                 -----------------------------------------------------------------------------------------------------
                  Service cost - benefits earned during the period                   $   7         $   7         $   7
                  Interest cost on projected benefit obligation                         16            13            12
                  Actual return on plan assets                                         (60)          (30)          (34)
                  Net amortization and deferral                                         42            14            21
                 -----------------------------------------------------------------------------------------------------
                  PENSION COST                                                       $   5         $   4         $   6
                 -----------------------------------------------------------------------------------------------------
                  
                  ASSUMPTIONS FOR ACTUARIAL PRESENT VALUE OF PROJECTED
                  BENEFIT OBLIGATIONS:
                 -----------------------------------------------------------------------------------------------------
                                                                                      1997          1996          1995
                 -----------------------------------------------------------------------------------------------------
                  Discount rate at measurement date                                    7.5%          7.5%          7.5%
                  Increase in future compensation                                      4.5%          4.5%          4.5%
                  Plan assets long-term rate of return                                 8.5%          8.5%          8.0%
                 -----------------------------------------------------------------------------------------------------
</TABLE>

                    In addition to providing pension benefits, the Company
                 provides certain health care and life insurance benefits for
                 retired employees. Substantially all of the Company's employees
                 may become eligible for those benefits if they reach retirement
                 age while working for the Company. The Company accrues the
                 expected postretirement benefit costs during employees' years
                 of service.




                                                                              37
<PAGE>   22
  
                    The following is information related to AmerenUE's
                 postretirement benefit plans as of December 31:

                    AmerenUE's funding policy is to annually contribute the net
                 periodic cost to a Voluntary Employee Beneficiary Association
                 trust (VEBA). Postretirement benefit costs were $44 million for
                 each of the years 1997, 1996 and 1995, of which approximately
                 17% was charged to construction accounts in 1997 and 19% in
                 each of 1996 and 1995. AmerenUE's transition obligation at
                 December 31, 1997, is being amortized over the next 15 years.

                    In August 1994, the MoPSC authorized the recovery of
                 postretirement benefit costs in rates to the extent that such
                 costs are funded. In December 1995, the Company established two
                 external trust funds for retiree health care and life insurance
                 benefits. For 1995, actual claims paid were approximately $15
                 million. In 1997 and 1996, claims were paid out of the plan
                 trust funds.

<TABLE>
<CAPTION>
                        FUNDED STATUS OF THE PLANS:
                        ----------------------------------------------------------------------------------------------------
<S>                                                                                       <C>           <C>           <C> 
                        (in millions)                                                      1997           1996          1995
                        ----------------------------------------------------------------------------------------------------
                        ACCUMULATED POSTRETIREMENT BENEFIT OBLIGATION:
                           Active employees eligible for benefits                         $  41          $  38         $  74
                           Retired employees                                                202            193           211
                           Other active employees                                            90             80            32
                        ----------------------------------------------------------------------------------------------------
                           Total benefit obligation                                         333            311           317
                           Less: Plan assets at fair market value*                           81             47            14
                        ----------------------------------------------------------------------------------------------------
                        Accumulated postretirement benefit obligation
                           in excess of plan assets                                         252            264           303
                        Unrecognized    - transition obligation                            (187)          (200)          (213)
                                        - gain/(loss)                                        18             19            (7)
                        ----------------------------------------------------------------------------------------------------
                        POSTRETIREMENT BENEFIT LIABILITY AT DECEMBER 31                   $  83          $  83         $  83
                        ----------------------------------------------------------------------------------------------------
                        * Plan assets consist principally of common stocks 
                          and fixed income securities.
</TABLE>


<TABLE>
<CAPTION>
                        COMPONENTS OF POSTRETIREMENT BENEFIT COST:
                        ----------------------------------------------------------------------------------------------------
                        (in millions)                                                      1997           1996           1995
                        ----------------------------------------------------------------------------------------------------
<S>                                                                                       <C>            <C>           <C>
                        Service cost - benefits earned during the period                    $12            $12           $10
                        Interest cost on projected benefit obligation                        23             22            24
                        Actual return on plan assets                                         (9)            (4)           --
                        Amortization    - transition obligation                              12             12            12
                                        - unrecognized gain                                  (1)            (1)           (2)
                        Deferred gain                                                         7              3            --
                        ----------------------------------------------------------------------------------------------------
                        NET PERIODIC COST                                                   $44            $44           $44
                        ----------------------------------------------------------------------------------------------------

                        ASSUMPTIONS FOR THE OBLIGATION MEASUREMENTS:
                        ----------------------------------------------------------------------------------------------------
                                                                                           1997           1996          1995
                        ----------------------------------------------------------------------------------------------------
                        Discount rate at measurement date                                     7%           7.5%         7.25%
                        Plan assets long-term rate of return                                8.5%           8.5%          8.5%
                        Medical cost trend rate  -  initial                                   7%          8.25%         9.25%
                                                 -  ultimate                                  5%          5.25%         5.25%
                        Ultimate medical cost trend rate expected in year                   2000          2000          2000
                        ----------------------------------------------------------------------------------------------------
</TABLE>

                           A 1% increase in the medical cost trend rate is
                        estimated to increase the net periodic cost and the
                        accumulated postretirement benefit obligation
                        approximately $3 million and $23 million, respectively.


38
<PAGE>   23
                           The following is information related to AmerenCIPS'
                        postretirement benefit plans as of December 31:

                           AmerenCIPS' funding policy is to fund the two VEBAs
                        and the 401(h) account established within the AmerenCIPS
                        retirement income trust with the lessor of the net
                        periodic cost or the amount deductible for federal
                        income tax purposes. AmerenCIPS uses a September 30
                        measurement date for its valuation of postretirement
                        assets and liabilities.

                           Postretirement benefit costs were $12 million for
                        1997, $16 million for 1996 and $17 million for 1995, of
                        which approximately 17% was charged to construction
                        accounts in 1997 and 15% in each of 1996 and 1995.
                        AmerenCIPS' transition obligation at December 31, 1997,
                        is being amortized over the next 15 years.

<TABLE>
<CAPTION>
                           FUNDED STATUS OF THE PLANS:
                        -----------------------------------------------------------------------------------------------------
                        (in millions)                                                      1997           1996           1995
                        -----------------------------------------------------------------------------------------------------
<S>                                                                                     <C>            <C>            <C>   
                        ACCUMULATED POSTRETIREMENT BENEFIT OBLIGATION:
                           Active employees eligible for benefits                          $ 23            $ 20          $ 17
                           Retired employees                                                 47              54            50
                           Other active employees                                            67              65            76
                        -----------------------------------------------------------------------------------------------------
                           Total benefit obligation                                         137             139           143
                           Less: Plan assets at fair market value*                          106              71            49
                        -----------------------------------------------------------------------------------------------------
                        Accumulated postretirement benefit obligation
                           in excess of plan assets                                          31              68            94
                        Unrecognized    -  transition obligation                            (84)            (89)          (99)
                                        -  gain                                              64              38            24
                        -----------------------------------------------------------------------------------------------------
                        Accrued postretirement benefit cost at September 30                  11              17            19
                        Expense, net of funding, October to December                         (7)            (14)          (15)
                        -----------------------------------------------------------------------------------------------------
                        POSTRETIREMENT BENEFIT LIABILITY AT DECEMBER 31                   $   4          $    3         $   4
                        -----------------------------------------------------------------------------------------------------

                        * Plan assets consist principally of common and 
                          preferred stocks, bonds, money market instruments
                          and real estate.


                        COMPONENTS OF POSTRETIREMENT BENEFIT COST:
                        -----------------------------------------------------------------------------------------------------
                        (in millions)                                                      1997           1996           1995
                        -----------------------------------------------------------------------------------------------------
                        Service cost - benefits earned during the period                  $   4           $  4          $  4
                        Interest cost on projected benefit obligation                        10             11            10
                        Actual return on plan assets                                        (21)            (9)           (8)
                        Amortization of transition obligation                                 6              6             6
                        Deferred gains                                                       13              4             5
                        -----------------------------------------------------------------------------------------------------
                        NET PERIODIC COST                                                  $ 12            $16           $17
                        -----------------------------------------------------------------------------------------------------

                        ASSUMPTIONS FOR THE OBLIGATION MEASUREMENTS:
                        -----------------------------------------------------------------------------------------------------
                                                                                           1997           1996           1995
                        ----------------------------------------------------------------------------------------------------- 
                        Discount rate at measurement date                                  7.25%           7.5%          7.5%
                        Plan assets long-term rate of return                                8.5%           8.5%          8.0%
                        Medical cost trend rate    -  initial                               8.5%           9.8%         10.6%
                                                   -  ultimate                              5.5%           4.5%          4.0%
                        Ultimate medical cost trend rate expected in year                   2005          2005          2007
                        -----------------------------------------------------------------------------------------------------
</TABLE>


                    A 1% increase in the medical cost trend rate is estimated to
                 increase the net periodic cost and the accumulated
                 postretirement benefit obligation as of September 30, 1997
                 approximately $3 million and $22 million, respectively.


      NOTE 9 -      AmerenUE has a long-term incentive plan (the Plan) for
 STOCK OPTION    eligible employees. The Plan provides for the grant of options,
     PLANS       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 the common shares at the date of grant. Granted options vest
                 over a period of five years, beginning at the date of 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 2007. Under
                 the Plan, subject to adjustment as provided in the Plan, 2.5
                 million shares have been authorized to be issued or delivered.



                                                                              39
<PAGE>   24
<TABLE>
<CAPTION>
                  SUMMARY OF STOCK OPTIONS:
                  ---------------------------------------------------------------------------------------------------------------
                                                                                   1997                1996                  1995
                  ---------------------------------------------------------------------------------------------------------------
<S>                                                                             <C>                 <C>             <C>  
                  Options outstanding at beginning of the year                  307,390             142,500                   --
                  Options granted during the year                               195,880             165,590               142,500
                  Options exercised during the year                                 --                  --                    --
                  Options expired/canceled during the year                        7,200                 700                   --
                  ---------------------------------------------------------------------------------------------------------------
                  Options outstanding at end of the year                        496,070             307,390               142,500
                  ---------------------------------------------------------------------------------------------------------------
                  Options exercisable at end of the year                        134,785              39,710                 9,800
                  ---------------------------------------------------------------------------------------------------------------
                  Exercise price range of options granted                        $38.50                 $43        $35.50-$35.875
                  ===============================================================================================================
</TABLE>

                    In accordance with APB 25, no compensation cost has been
                 recognized for the Company's stock compensation plans. In 1996,
                 the Company adopted the disclosure-only method under SFAS 123,
                 "Accounting for Stock-Based Compensation." If the fair value
                 based accounting method under this statement had been used to
                 account for stock-based compensation cost, the effects on 1997,
                 1996 and 1995 net income and earnings per share would have been
                 immaterial.

                    The Company's calculation of basic and diluted earnings per
                 share resulted in the same earnings per share amounts for each
                 of the years 1997, 1996 and 1995. The reconciling item in each
                 of the years is comprised of assumed stock option conversions
                 which increased the number of shares outstanding in the diluted
                 earnings per share calculation by 7,318 shares, 12,879 shares
                 and 3,892 shares in 1997, 1996 and 1995, respectively.

   NOTE 10 -     The Company is engaged in a construction program under which
  COMMITMENTS    expenditures averaging approximately $333 million, including
CONTINGENCIES    AFC, are anticipated during each of the next five years. This
                 estimate does not include any construction expenditures which
                 may be incurred by the Company to meet new air quality
                 standards for ozone and particulate matter, as discussed later
                 in this Note.

                    The Company has commitments for the purchase of coal under
                 long-term contracts. Coal contract commitments, including
                 transportation costs, for 1998 through 2002 are estimated to
                 total $1.5 billion. Total coal purchases, including
                 transportation costs, for 1997, 1996 and 1995 were $476
                 million, $514 million and $460 million, respectively. The
                 Company also has existing contracts with pipeline and natural
                 gas suppliers to provide natural gas for distribution and
                 electric generation. Gas-related contracted cost commitments
                 for 1998 through 2002 are estimated to total $212 million.
                 Total delivered natural gas costs for 1997, 1996 and 1995 were
                 $160 million, $161 million and $127 million, respectively. The
                 Company's nuclear fuel commitments for 1998 through 2002,
                 including uranium concentrates, conversion, enrichment and
                 fabrication, are expected to total $116 million, and are
                 expected to be financed under the nuclear fuel lease. Nuclear
                 fuel expenditures for 1997, 1996 and 1995 were $35 million, $51
                 million and $42 million, respectively. Additionally, the
                 Company has long-term contracts with other utilities to
                 purchase electric capacity. These commitments for 1998 through
                 2002 are estimated to total $187 million. During 1997, 1996 and
                 1995, electric capacity purchases were $34 million, $44 million
                 and $42 million, respectively.

                    During 1996, the Company restructured its contract with one
                 of its major coal suppliers. In 1997, the Company paid a $70
                 million restructuring payment to the supplier, which allows
                 them to purchase at market prices low-sulfur, non-Illinois coal
                 through the supplier (in substitution for the high-sulfur
                 Illinois coal the Company was obligated to purchase under the
                 original contract); and would receive options for future
                 purchases of low-sulfur, non-Illinois coal from the supplier
                 through 1999 at set negotiated prices.

                    By switching to low-sulfur coal, the Company was able to
                 discontinue operating a generating station scrubber. The
                 benefits of the restructuring include lower cost coal,
                 avoidance of significant capital expenditures to renovate the
                 scrubber and elimination of scrubber operations and maintenance
                 costs (offset by scrubber retirement expenses). The net
                 benefits of restructuring are expected to exceed $100 million
                 over the next 10 years. In December 1996, the ICC entered an
                 order approving the switch to non-Illinois coal, recovery of
                 the restructuring payment plus associated carrying costs
                 (Restructuring Charges) through the retail FAC over six years,
                 and continued recovery in rates of the undepreciated scrubber
                 investment plus costs of removal. Additionally, in May 1997 the
                 FERC approved recovery of the wholesale portion of the
                 Restructuring Charges through the wholesale FAC. As a result of
                 the ICC and FERC orders, the Company classified the $72 million
                 of the Restructuring Charges made to the coal supplier in
                 February 1997 as a regulatory asset and, through December 1997,
                 recovered approximately $10 million of the Restructuring
                 Charges through the retail FAC and from wholesale customers.

                    A group of industrial customers filed with the Illinois
                 Third District Appellate Court (the Court) in February 1997 an
                 appeal of the December 1996 order of the ICC. On November 24,
                 1997, the Court reversed the ICC's December 1996 order, finding
                 that the Restructuring Charges were not direct costs 



40
<PAGE>   25
                 of fuel that may be recovered through the retail FAC, but
                 rather should be considered as a part of a review of aggregate
                 revenue requirements in a full rate case. Restructuring Charges
                 allocated to wholesale customers (approximately $7 million) are
                 not in question as a result of the opinion of the Court. In
                 December 1997, the Company requested a rehearing by the Court;
                 that request was denied. However, the Court did rule that all
                 revenues collected under the retail FAC in 1997 would not have
                 to be refunded to customers. The Company has appealed to the
                 Illinois Supreme Court the Court's decision that Restructuring
                 Charges may not be recovered through the retail FAC.

                    The recoverability of the Restructuring Charges under the
                 retail FAC in Illinois was also impacted by the Electric
                 Service Customer Choice and Rate Relief Law of 1997 (the Act).
                 Among other things, the Act provides utilities with the option
                 to eliminate the retail FAC and limits the ability of utilities
                 to file a full rate case for its aggregate revenue
                 requirements. After evaluating the impact of the Act on the
                 future recoverability of the Company's Restructuring Charges
                 through future rates, the Company concluded that the
                 unamortized balance of the Illinois retail portion of its
                 Restructuring Charges as of December 31, 1997, should be
                 written off ($34 million, net of income taxes). See Note 2 -
                 Regulatory Matters for further information.
  
                    The Company's insurance coverage for Callaway Nuclear Plant
                 at December 31, 1997, was as follows:

<TABLE>
<CAPTION>
                        TYPE AND SOURCE OF COVERAGE
                        ----------------------------------------------------------------------
                        (in millions)                                 Maximum          Maximum
                                                                    Coverages      Assessments
                                                                                    for Single
                                                                                     Incidents
                        ----------------------------------------------------------------------
<S>                                                                <C>             <C>
                        Public Liability:                                        
                           American Nuclear Insurers               $   200           $    --
                           Pool Participation                        8,720                79(a) 
                        ----------------------------------------------------------------------  
                                                                   $ 8,920 (b)       $    79
                        ----------------------------------------------------------------------  
                        Nuclear Worker Liability:                                
                           American Nuclear Insurers               $   200 (c)       $     3
                        ----------------------------------------------------------------------  
                        Property Damage:                                         
                           American Nuclear Insurers               $   500           $     --
                           Nuclear Electric Insurance Ltd.           2,250 (d)             11
                        ----------------------------------------------------------------------  
                                                                   $ 2,750                $11
                        ----------------------------------------------------------------------  
                        Replacement Power:                                       
                           Nuclear Electric Insurance Ltd.         $   473 (e)       $      4
                        =====================================================================
</TABLE>

                    (a) Retrospective premium under the Price-Anderson liability
                 provisions of the Atomic Energy Act of 1954, as amended,
                 (Price-Anderson). Subject to retrospective assessment with
                 respect to loss from an incident at any U.S. reactor, payable
                 at $10 million per year.

                    (b) Limit of liability for each incident under
                 Price-Anderson.

                    (c) Industry limit for potential liability from workers
                 claiming exposure to the hazard of nuclear radiation.

                    (d) Includes premature decommissioning costs.

                    (e) Weekly indemnity of $3.5 million, for 52 weeks which
                 commences after the first 21 weeks of an outage, plus $2.8
                 million per week for 104 weeks thereafter.

                    Price-Anderson limits the liability for claims from an
                 incident involving any licensed U.S. nuclear facility. The
                 limit is based on the number of licensed reactors and is
                 adjusted at least every five years based on the Consumer Price
                 Index. Utilities owning a nuclear reactor cover this exposure
                 through a combination of private insurance and mandatory
                 participation in a financial protection pool as established by
                 Price-Anderson. 

                    If losses from a nuclear incident at Callaway Plant exceed
                 the limits of, or are not subject to, insurance, or if coverage
                 is not available, the Company will self-insure the risk.
                 Although the Company has no reason to anticipate a serious
                 nuclear incident, if one did occur it could have a material but
                 indeterminable adverse effect on the Company's financial
                 position, results of operations or liquidity.

                    Under the Title IV of the Clean Air Act Amendments of 1990,
                 the Company is required to significantly reduce total annual
                 sulfur dioxide emissions by the year 2000. Significant
                 reductions in nitrogen oxide are also required. By switching to
                 low-sulfur coal and early banking of emission credits, the
                 Company anticipates that it can comply with the requirements of
                 the law without significant revenue increases because the
                 related capital costs are largely offset by lower fuel costs.
                 As of year-end 1997, estimated remaining capital costs expected
                 to be incurred pertaining to Clean Air Act-related projects
                 totaled $107 million.

                                                                              41
<PAGE>   26
                    In July 1997, the United States Environmental Protection
                 Agency (EPA) issued final regulations revising the National
                 Ambient Air Quality Standards for ozone and particulate matter.
                 Although specific emission control requirements are still being
                 developed, it is believed that the revised standards will
                 require significant additional reductions in nitrogen oxide and
                 sulfur dioxide emissions from coal-fired boilers. In October
                 1997, the EPA announced that Missouri and Illinois are included
                 in the area targeted for nitrogen oxide emissions reductions as
                 part of the EPA's regional control program. Reduction
                 requirements in nitrogen oxide emissions from the Company's
                 coal-fired boilers could exceed 80% from 1990 levels by the
                 year 2002. Reduction requirements in sulfur dioxide emissions
                 may be up to 50% beyond that already required by Phase II acid
                 rain control provisions of the 1990 Clean Air Act Amendments
                 and could be required by 2007. Because of the magnitude of
                 these additional reductions, the Company could be required to
                 incur significantly higher capital costs to meet future
                 compliance obligations for its coal-fired boilers or purchase
                 power from other sources, either of which could have
                 significantly higher operations and maintenance expenditures
                 associated with compliance. At this time, the Company is unable
                 to determine the impact of the revised air quality standards on
                 its future financial condition, results of operations or
                 liquidity.

                    In December 1997, the United States and numerous other
                 countries agreed to certain environmental provisions (the Kyoto
                 Protocol), which would require decreases in greenhouse gases in
                 an effort to address the "global warming" issue. The Company is
                 unable to predict what requirements, if any, will be adopted in
                 this country. However, implementation of the Kyoto Protocol in
                 its present form would likely result in significantly higher
                 capital costs and operations and maintenance expenditures by
                 the Company. At this time, the Company is unable to determine
                 the impact of these proposals on its future financial
                 condition, results of operations or liquidity.

                    As of December 31, 1997, the Company's utility operating
                 subsidiaries were designated as potentially responsible parties
                 (PRP) by federal and state environmental protection agencies at
                 five hazardous waste sites. Other hazardous waste sites have
                 been identified for which the Company may be responsible but
                 has not been designated a PRP.

                    Costs relating to studies and remediation and associated
                 legal and litigation expenses at the sites located in Illinois
                 are being accrued and deferred rather than expensed currently,
                 pending recovery through rates. Through December 31, 1997, the
                 total of the costs deferred, net of recoveries from insurers
                 and through environmental adjustment clause rate riders
                 approved by the ICC, was $13 million.

                    The ICC has instituted a reconciliation proceeding to review
                 the Company's environmental remediation activities in 1993,
                 1994 and 1995 and to determine whether the revenues collected
                 under the riders in 1993 were consistent with the amount of
                 remediation costs prudently and properly incurred. Amounts
                 found to have been incorrectly included under the riders would
                 be subject to refund. In mid-1997, the Company and the ICC
                 Staff submitted a stipulation with regard to all matters at
                 issue which concluded that the amounts collected under the
                 environmental rate rider were appropriate in all material
                 respects. A ruling from the ICC is still pending.

                    The Company continually reviews remediation costs that may
                 be required for all of these sites. Any unrecovered
                 environmental costs are not expected to have a material adverse
                 effect on the Company's financial position, results of
                 operations or liquidity.

                    The International Union of Operating Engineers Local 148 and
                 the International Brotherhood of Electrical Workers Local 702
                 filed unfair labor practice charges with the National Labor
                 Relations Board (NLRB) relating to the legality of the lockout
                 by AmerenCIPS of both unions during 1993. The NLRB has issued
                 complaints against AmerenCIPS concerning its lockout. Both
                 unions seek, among other things, back pay and other benefits
                 for the period of the lockout. The Company estimates the amount
                 of back pay and other benefits for both unions to be
                 approximately $17 million. An administrative law judge of the
                 NLRB has ruled that the lockout was unlawful. On July 23, 1996,
                 the Company appealed to the NLRB. The Company believes the
                 lockout was both lawful and reasonable and that the final
                 resolution of the disputes will not have a material adverse
                 effect on its financial position, results of operations or
                 liquidity.

                    Regulatory changes enacted and being considered at the
                 federal and state levels continue to change the structure of
                 the utility industry and utility regulation, as well as
                 encourage increased competition. At this time, the Company is
                 unable to predict the impact of these changes on its future
                 financial condition, results of operations or liquidity. (See
                 Note 2 - Regulatory Matters for further information.)

                    The Company is involved in other legal and administrative
                 proceedings before various courts and agencies with respect to
                 matters arising in the ordinary course of business, some of
                 which involve substantial amounts. The Company believes that
                 the final disposition of these proceedings will not have a
                 material adverse effect on its financial position, results of
                 operations or liquidity.


42
<PAGE>   27
  NOTE 11 -      Under the Nuclear Waste Policy Act of 1982, the DOE is
  CALLAWAY       responsible for the permanent storage and disposal of spent
  NUCLEAR        nuclear fuel. The DOE currently charges one mill per
  PLANT          nuclear-generated kilowatthour sold for future disposal of
                 spent fuel. Electric rates charged to customers provide for
                 recovery of such costs. The DOE is not expected to have its
                 permanent storage facility for spent fuel available until at
                 least 2015. The Company has sufficient storage capacity at
                 Callaway Plant site until 2004 and is pursuing a viable storage
                 alternative. This alternative will require Nuclear Regulatory
                 Commission approval. The delayed availability of the DOE's
                 disposal facility is not expected to adversely affect the
                 continued operation of Callaway Plant.

                    Electric rates charged to customers provide for recovery of
                 Callaway Plant decommissioning costs over the life of the
                 plant, based on an assumed 40-year life, ending with expiration
                 of the plant's operating license in 2024. The Callaway site is
                 assumed to be decommissioned using the DECON (immediate
                 dismantlement) method. Decommissioning costs, including
                 decontamination, dismantling and site restoration, are
                 estimated to be $451 million in current year dollars and are
                 expected to escalate approximately 4% per year through the end
                 of decommissioning activity in 2033. Decommissioning costs are
                 charged to depreciation expense over Callaway's service life
                 and amounted to $7 million in each of the years 1997, 1996 and
                 1995. Every three years, the MoPSC requires the Company to file
                 updated cost studies for decommissioning Callaway, and electric
                 rates may be adjusted at such times to reflect changed
                 estimates. The latest study was filed in 1996. Costs collected
                 from customers are deposited in an external trust fund to
                 provide for Callaway's decommissioning. Fund earnings are
                 expected to average 9.25% annually through the date of
                 decommissioning. If the assumed return on trust assets is not
                 earned, the Company believes it is probable that such earnings
                 deficiency will be recovered in rates. Trust fund earnings, net
                 of expenses, appear on the consolidated balance sheet as
                 increases in the nuclear decommissioning trust fund and in the
                 accumulated provision for nuclear decommissioning.

                    The staff of the SEC has questioned certain current
                 accounting practices of the electric utility industry,
                 regarding the recognition, measurement and classification of
                 decommissioning costs for nuclear generating stations in the
                 financial statements of electric utilities. In response to
                 these questions, the Financial Accounting Standards Board has
                 agreed to review the accounting for removal costs, including
                 decommissioning. The Company does not expect that changes in
                 the accounting for nuclear decommissioning costs will have a
                 material effect on its financial position, results of
                 operations or liquidity.

NOTE 12 -        The following methods and assumptions were used to estimate the
FAIR VALUE OF    fair value of each class of financial instruments for which it
FINANCIAL        is practicable to estimate that value.
INSTRUMENTS    

                 CASH AND TEMPORARY INVESTMENTS/SHORT-TERM BORROWINGS
                 The carrying amounts approximate fair value because of the
                 short-term maturity of these instruments.

                 MARKETABLE SECURITIES
                 The fair value is based on quoted market prices obtained from
                 dealers or investment managers.


                 NUCLEAR DECOMMISSIONING TRUST FUND
                 The fair value is estimated based on quoted market prices for
                 securities.

                 PREFERRED STOCK OF SUBSIDIARIES
                 The fair value is estimated based on the quoted market prices
                 for the same or similar issues.

                 LONG-TERM DEBT OF SUBSIDIARIES
                 The fair value is estimated based on the quoted market prices
                 for same or similar issues or on the current rates offered to
                 the Company for debt of comparable maturities.

                    Carrying amounts and estimated fair values of the Company's
                 financial instruments at December 31:

<TABLE>
<CAPTION>
                  ----------------------------------------------------------------------------------------------------
                 (in millions)                                       1997           1997           1996           1996
                                                                 CARRYING           FAIR       Carrying           Fair
                                                                   AMOUNT          VALUE         Amount          Value
                  ----------------------------------------------------------------------------------------------------
<S>                                                              <C>            <C>           <C>             <C>     
                    Marketable securities                        $     32       $     32      $     51        $     51
                    Preferred stock                                   235            214           299             257
                    Long-term debt (including current portion)      2,558          2,692         2,482           2,545
                  ----------------------------------------------------------------------------------------------------
</TABLE>


                                                                              43
<PAGE>   28
                     The Company has investments in debt and equity securities
                 that are held in trust funds for the purpose of funding the
                 nuclear decommissioning of Callaway Nuclear Plant (see Note 11
                 - Callaway Nuclear Plant). The Company has classified these
                 investments in debt and equity securities as available for sale
                 and has recorded all such investments at their fair market
                 value at December 31, 1997 and 1996. In 1997, 1996 and 1995,
                 the proceeds from the sale of investments were $24 million, $20
                 million and $9 million, respectively. Using the specific
                 identification method to determine cost, the gross realized
                 gains on those sales were approximately $2 million for 1997 and
                 $1 million each for 1996 and 1995. Net realized and unrealized
                 gains and losses are reflected in the accumulated provision for
                 nuclear decommissioning on the consolidated balance sheet,
                 which is consistent with the method used by the Company to
                 account for the decommissioning costs recovered in rates.
  
                     Costs and fair values of investments in debt and equity
                 securities in the nuclear decommissioning trust fund at
                 December 31 were as follows:

<TABLE>
<CAPTION>
                 -----------------------------------------------------------------------------------------------------
                 1997 (in millions)                                                GROSS UNREALIZED
                 -----------------------------------------------------------------------------------------------------
                 Security Type                                       COST          GAIN          (LOSS)     FAIR VALUE
                 -----------------------------------------------------------------------------------------------------
<S>                                                                  <C>          <C>           <C>         <C>
                    Debt securities                                   $34          $   3         $  --           $  37
                    Equity securities                                  43             40            --              83
                    Cash equivalents                                    2             --            --               2
                 -----------------------------------------------------------------------------------------------------
                                                                      $79          $  43         $  --           $ 122
                 =====================================================================================================
<CAPTION>
                 -----------------------------------------------------------------------------------------------------
                 1996 (in millions)                                               Gross Unrealized
                 -----------------------------------------------------------------------------------------------------
                 Security Type                                       Cost          Gain          (Loss)     Fair Value
                 -----------------------------------------------------------------------------------------------------
<S>                                                                  <C>          <C>            <C>           <C>

                    Debt securities                                   $29         $    2          $ --             $31
                    Equity securities                                  40             22            --              62
                    Cash equivalents                                    4             --            --               4
                 -----------------------------------------------------------------------------------------------------
                                                                      $73            $24           $--             $97
                 =====================================================================================================
</TABLE>
                 The contractual maturities of investments in debt securities
                 at December 31, 1997 were as follows:

<TABLE>
<CAPTION>
                 -----------------------------------------------------------------------------------------------------
                 (in millions)                                                                    Cost      Fair Value
                 -----------------------------------------------------------------------------------------------------
                 <S>                                                                             <C>           <C>
                 1 year to 5 years                                                                $  4           $  4
                 5 years to 10 years                                                                 6              7
                 Due after 10 years                                                                 24             26
                 -----------------------------------------------------------------------------------------------------
                                                                                                  $ 34           $ 37
                 =====================================================================================================
</TABLE>



44

<PAGE>   29
SELECTED CONSOLIDATED FINANCIAL INFORMATION

<TABLE>
<CAPTION>
(Millions of Dollars Except Shares and per Share Amounts and Ratios)         1997              1996             1995
- --------------------------------------------------------------------    -------------     -------------    -------------
<S>                                                                     <C>               <C>              <C>
RESULTS OF OPERATIONS (Year ended December 31,)
 Operating revenues                                                     $       3,327     $       3,328    $       3,236
 Operating expenses                                                             2,744             2,752            2,658
 Operating income                                                                 582               576              578
 Income before extraordinary charge                                               387               372              373
 Extraordinary charge, net of income taxes                                         52              --               --
 Net income                                                                       335               372              373
 Average common shares outstanding                                        137,215,462       137,215,462      137,215,462
                                                                        -------------     -------------    -------------

ASSETS, OBLIGATIONS AND EQUITY CAPITAL (December 31,)
 Total assets                                                           $       8,828     $       8,933    $       8,788
 Long-term debt obligations                                                     2,506             2,335            2,373
 Preferred stock subject to
  mandatory redemption                                                           --                   1                1
 Preferred stock not subject to
  mandatory redemption                                                            235               298              298
 Common equity                                                                  3,019             3,016            2,971
                                                                        -------------     -------------    -------------

FINANCIAL INDICES (Year ended December 31,)
 Earnings per share of common stock
  before extraordinary charge                                           $        2.82     $        2.71    $        2.72
 Extraordinary charge, net of income taxes                              $        (.38)             --               --
 Earnings per share of common stock
  (based on average shares outstanding)                                 $        2.44     $        2.71    $        2.72
 Dividend payout ratio                                                             99%               88%              86%
 Return on average common stock equity                                          11.14%            12.51%           12.76%
 Ratio earnings to fixed charges
  AmerenUE                                                                       4.70              4.68             4.78
  AmerenCIPS                                                                     3.64              4.30             4.41
 Book value per common share                                            $       22.00     $       21.98    $       21.65
                                                                        -------------     -------------    -------------

CAPITALIZATION RATIOS (December 31,)
 Common equity                                                                   52.4%             53.4%            52.6%
 Preferred stock                                                                  4.1               5.3              5.3
 Long-term debt                                                                  43.5              41.3             42.1
                                                                        -------------     -------------    -------------
                                                                                100.0%            100.0%           100.0%
                                                                        =============     =============    =============
</TABLE>

<TABLE>
<CAPTION>
(Millions of Dollars Except Shares and per Share Amounts and Ratios)         1994             1993             1992
- --------------------------------------------------------------------    -------------    -------------    -------------
<S>                                                                     <C>              <C>              <C>
RESULTS OF OPERATIONS (Year ended December 31,)
 Operating revenues                                                     $       3,270    $       3,272    $       3,047
 Operating expenses                                                             2,685            2,724            2,514
 Operating income                                                                 585              548              533
 Income before extraordinary charge                                               391              369              361
 Extraordinary charge, net of income taxes                                       --               --               --
 Net income                                                                       391              369              361
 Average common shares outstanding                                        137,253,617      137,254,771      137,254,771
                                                                        -------------    -------------    -------------

ASSETS, OBLIGATIONS AND EQUITY CAPITAL (December 31,)
 Total assets                                                           $       8,629    $       8,546    $       7,631
 Long-term debt obligations                                                     2,413            2,301            2,213
 Preferred stock subject to
  mandatory redemption                                                              1                1                1
 Preferred stock not subject to
  mandatory redemption                                                            298              298              283
 Common equity                                                                  2,917            2,840            2,781
                                                                        -------------    -------------    -------------

FINANCIAL INDICES (Year ended December 31,)
 Earnings per share of common stock
  before extraordinary charge                                           $        2.85    $        2.69    $        2.63
 Extraordinary charge, net of income taxes                                       --               --               --
 Earnings per share of common stock
  (based on average shares outstanding)                                 $        2.85    $        2.69    $        2.63
 Dividend payout ratio                                                             80%              83%              82%
 Return on average common stock equity                                          13.69%           13.18%           13.30%
 Ratio earnings to fixed charges
  AmerenUE                                                                       4.68             4.66             4.66
  AmerenCIPS                                                                     4.93             4.82             4.12
 Book value per common share                                            $       21.25    $       20.69    $       20.26
                                                                        -------------    -------------    -------------

CAPITALIZATION RATIOS (December 31,)
 Common equity                                                                   51.8%            52.2%            52.7%
 Preferred stock                                                                  5.3              5.5              5.4
 Long-term debt                                                                  42.9             42.3             41.9
                                                                        -------------    -------------    -------------
                                                                                100.0%           100.0%           100.0%
                                                                        =============    =============    =============
</TABLE>


                                                                              45
<PAGE>   30
ELECTRIC OPERATING STATISTICS

<TABLE>
<CAPTION>
(Year Ended December 31,)                               1997                  1996                  1995
- -------------------------                           ------------          ------------          ------------
<S>                                                 <C>                   <C>                   <C>
ELECTRIC OPERATING REVENUES (Millions)
 Residential                                        $      1,064          $      1,070          $      1,073
 Commercial                                                  927                   920                   906
 Industrial                                                  500                   500                   496
 Wholesale                                                    91                    91                    87
 Interchange                                                 224                   280                   230
 EEI                                                         207                   198                   201
 Miscellaneous                                                71                    50                    48
 Credit to customers                                         (20)                  (47)                  (33)
                                                    ------------          ------------          ------------
TOTAL ELECTRIC OPERATING REVENUES                   $      3,064          $      3,062          $      3,008
                                                    ============          ============          ============

KILOWATTHOUR SALES (Millions)
 Residential                                              14,325                14,418                14,086
 Commercial                                               14,990                14,872                14,464
 Industrial                                               11,404                11,191                10,971
 Wholesale                                                 2,323                 2,328                 2,248
 Interchange                                               9,402                10,768                 8,176
 EEI                                                      11,220                10,554                10,850
 Miscellaneous                                               317                   305                   316
                                                    ------------          ------------          ------------
TOTAL KILOWATTHOUR SALES                                  63,981                64,436                61,111
                                                    ============          ============          ============

ELECTRIC CUSTOMERS (End of Year)
 Residential                                           1,282,042             1,275,534             1,267,976
 Commercial                                              180,206               176,621               173,810
 Industrial                                                6,554                 6,660                 6,782
 Wholesale                                                    21                    20                    21
 Miscellaneous                                             2,381                 2,398                 2,434
                                                    ------------          ------------          ------------
TOTAL ELECTRIC CUSTOMERS                               1,471,204             1,461,233             1,451,023
                                                    ============          ============          ============

RESIDENTIAL CUSTOMER DATA (Average)
 Kilowatthours used                                       11,215                11,354                11,152
 Annual electric bill                               $     833.34          $     842.82          $     849.62
 Revenue per kilowatthour                                   7.38(CENT)            7.30(cent)            7.62(cent)
                                                    ------------          ------------          ------------
GROSS INSTANTANEOUS PEAK DEMAND (Megawatts)
 AmerenUE                                                  8,055                 8,085                 7,965
                                                    ------------          ------------          ------------
 AmerenCIPS                                                1,923                 1,892                 1,940
                                                    ------------          ------------          ------------
CAPABILITY AT TIME OF PEAK,
 INCLUDING NET PURCHASES AND SALES (Megawatts)
 AmerenUE                                                  8,950                 9,120                 8,714
                                                    ------------          ------------          ------------
 AmerenCIPS                                                2,491                 2,519                 2,489
                                                    ------------          ------------          ------------
GENERATING CAPABILITY AT TIME OF PEAK (Megawatts)
 AmerenUE                                                  8,279                 8,244                 8,184
                                                    ------------          ------------          ------------
 AmerenCIPS                                                3,033                 3,033                 3,018
                                                    ------------          ------------          ------------
COAL BURNED (Tons)                                    21,392,000            20,062,000            17,715,000
                                                    ------------          ------------          ------------
PRICE PER TON OF COAL (Average)                     $      23.54          $      25.25          $      26.86
                                                    ------------          ------------          ------------
SOURCE OF ENERGY SUPPLY (Percent)
 Coal                                                       83.8%                 79.6%                 76.3%
 Nuclear                                                    19.3                  19.2                  18.3
 Hydro                                                       2.7                   2.8                   3.6
 Purchased, net                                             (5.8)                 (1.6)                  1.8
                                                    ------------          ------------          ------------
                                                           100.0%                100.0%                100.0%
                                                    ============          ============          ============
</TABLE>

<TABLE>
<CAPTION>
(Year Ended December 31,)                                  1994                  1993                 1992
- -------------------------                              ------------          ------------         ------------
<S>                                                    <C>                   <C>                  <C>
ELECTRIC OPERATING REVENUES (Millions)
 Residential                                           $      1,014          $      1,037         $        952
 Commercial                                                     884                   861                  846
 Industrial                                                     487                   486                  520
 Wholesale                                                       84                    81                   77
 Interchange                                                    243                   254                  123
 EEI                                                            276                   251                  256
 Miscellaneous                                                   42                    46                   43
 Credit to customers                                           --                    --                   --
                                                       ------------          ------------         ------------
TOTAL ELECTRIC OPERATING REVENUES                      $      3,030          $      3,016         $      2,817
                                                       ============          ============         ============

KILOWATTHOUR SALES (Millions)
 Residential                                                 13,282                13,636               12,103
 Commercial                                                  14,043                13,642               12,964
 Industrial                                                  10,728                10,407               11,371
 Wholesale                                                    2,137                 2,088                1,953
 Interchange                                                  8,080                10,326                4,387
 EEI                                                         14,594                12,521               14,037
 Miscellaneous                                                  301                   317                  307
                                                       ------------          ------------         ------------
TOTAL KILOWATTHOUR SALES                                     63,165                62,937               57,122
                                                       ============          ============         ============

ELECTRIC CUSTOMERS (End of Year)
 Residential                                              1,258,757             1,248,723            1,243,863
 Commercial                                                 171,072               168,566              166,912
 Industrial                                                   6,750                 7,137                7,067
 Wholesale                                                       21                    21                   23
 Miscellaneous                                                2,406                 2,407                2,367
                                                       ------------          ------------         ------------
TOTAL ELECTRIC CUSTOMERS                                  1,439,006             1,426,854            1,420,232
                                                       ============          ============         ============

RESIDENTIAL CUSTOMER DATA (Average)
 Kilowatthours used                                          10,606                10,946                9,683
 Annual electric bill                                  $     809.27          $     832.46         $     761.08
 Revenue per kilowatthour                                      7.63(cent)            7.61(cent)           7.86(cent)
                                                       ------------          ------------         ------------
GROSS INSTANTANEOUS PEAK DEMAND (Megawatts)
 AmerenUE                                                     7,430                 7,540                7,135
                                                       ------------          ------------         ------------
 AmerenCIPS                                                   1,854                 1,848                1,649
                                                       ------------          ------------         ------------
CAPABILITY AT TIME OF PEAK,
 INCLUDING NET PURCHASES AND SALES (Megawatts)
 AmerenUE                                                     8,469                 8,597                8,407
                                                       ------------          ------------         ------------
 AmerenCIPS                                                   2,510                 2,439                2,534
                                                       ------------          ------------         ------------
GENERATING CAPABILITY AT TIME OF PEAK (Megawatts)
 AmerenUE                                                     8,057                 7,963                7,868
                                                       ------------          ------------         ------------
 AmerenCIPS                                                   3,018                 2,901                2,881
                                                       ------------          ------------         ------------
COAL BURNED (Tons)                                       16,885,000            14,879,000           14,843,000
                                                       ------------          ------------         ------------
PRICE PER TON OF COAL (Average)                        $      28.02          $      33.36         $      33.33
                                                       ------------          ------------         ------------
SOURCE OF ENERGY SUPPLY (Percent)
 Coal                                                          76.2%                 70.7%                73.9%
 Nuclear                                                       23.0                  19.5                 19.5
 Hydro                                                          3.9                   4.6                  3.5
 Purchased, net                                                (3.1)                  5.2                  3.1
                                                       ------------          ------------         ------------
                                                              100.0%                100.0%               100.0%
                                                       ============          ============         ============
</TABLE>


46
<PAGE>   31
GAS OPERATING STATISTICS

<TABLE>
<CAPTION>
(Year Ended December 31):                     1997            1996            1995            1994            1993            1992
- -------------------------                   --------        --------        --------        --------        --------        --------
NATURAL GAS OPERATING REVENUES (Millions)
<S>                                         <C>             <C>             <C>             <C>             <C>             <C>
 Residential                                $    150        $    161        $    137        $    138        $    153        $    139
 Commercial                                       55              61              51              53              58              53
 Industrial                                       22              21              18              24              22              13
 Off system sales                                 13            --              --              --              --              --
 Miscellaneous                                    10              11              11              10              12              13
                                            --------        --------        --------        --------        --------        --------
TOTAL NATURAL GAS OPERATING REVENUES        $    250        $    254        $    217        $    225        $    245        $    218
                                            ========        ========        ========        ========        ========        ========

DEKATHERM SALES (Millions)
 Residential                                      23              27              24              23              26              22
 Commercial                                        9              11              10              10              10               9
 Industrial                                        6               5               5               6               6               3
 Off system sales                                  5            --              --              --              --              --
                                            --------        --------        --------        --------        --------        --------
TOTAL DEKATHERM SALES                             43              43              39              39              42              34
                                            ========        ========        ========        ========        ========        ========

NATURAL GAS CUSTOMERS (End of Year)
 Residential                                 263,588         260,989         257,848         254,328         251,171         248,707
 Commercial                                   30,147          29,911          29,446          29,037          28,676          28,393
 Industrial                                      412             402             378             351             307             261
                                            --------        --------        --------        --------        --------        --------
TOTAL NATURAL GAS CUSTOMERS                  294,147         291,302         287,672         283,716         280,154         277,361
                                            ========        ========        ========        ========        ========        ========
</TABLE>


                                                                              47
<PAGE>   32
INVESTOR INFORMATION


COMMON STOCK AND DIVIDEND INFORMATION

    Ameren's common stock is listed on the New York Stock Exchange (ticker
symbol: AEE). AEE began trading on January 2, 1998, following the merger on
December 31, 1997, and is being issued in exchange for Union Electric and CIPSCO
Incorporated common stock.

    Common stockholders of record totaled 102,710 and 37,777 for Union Electric
(UEP) and CIPSCO Incorporated (CIP), respectively at December 31, 1997. The
following includes the price ranges and dividends paid per common share for UEP
and CIP during the past two years:

<TABLE>
<CAPTION>
UEP
1997
Quarter Ended                    High                Low              Dividends Paid
- -------------                  ---------           --------           --------------
<S>                            <C>                 <C>                <C>
March 31                       $39 3/4             $36 1/4             63 1/2(CENT)
                               ---------           --------            -----------
June 30                         37 13/16            34 1/2             63 1/2
                               ---------           --------            -----------
September 30                    38 7/8              36 7/16            63 1/2
                               ---------           --------            -----------
December 31                     43 3/4              35 5/8             63 1/2
</TABLE>

<TABLE>
<CAPTION>
1996
Quarter Ended                    High                Low              Dividends Paid
- -------------                  ---------           --------           --------------
<S>                            <C>                 <C>                <C>
March 31                       $44 1/8             $38 7/8             62 1/2(cent)
                               ---------           --------            -----------
June 30                         41 1/4              38 1/8             62 1/2
                               ---------           --------            -----------
September 30                    40 5/8              36                 62 1/2
                               ---------           --------            -----------
December 31                     40 1/8              36 7/8             63 1/2
</TABLE>

<TABLE>
<CAPTION>
CIP
1997
Quarter Ended                    High                Low              Dividends Paid
- -------------                  ---------           --------           --------------
<S>                            <C>                 <C>                <C>
March 31                       $37                 $34 7/8             52(CENT)
                               ---------           --------            -----------
June 30                         36 5/8              33 1/2             53
                               ---------           --------            -----------
September 30                    38 9/16             36                 53
                               ---------           --------            -----------
December 31                     45                  36 3/8             53
</TABLE>

<TABLE>
<CAPTION>
1996
Quarter Ended                    High                Low              Dividends Paid
- -------------                  ---------           --------           --------------
<S>                            <C>                 <C>                <C>
March 31                       $41 1/4             $37 1/8             51(cent)
                               ---------           --------            -----------
June 30                         38 5/8              35 7/8             52
                               ---------           --------            -----------
September 30                    38 1/2              34 7/8             52
                               ---------           --------            -----------
December 31                     38 1/4              34 7/8             52
</TABLE>



ANNUAL MEETING

    The annual meeting of Ameren common stockholders and Union Electric and CIPS
preferred stockholders will convene at 9 a.m., Tuesday, April 28, 1998, at
Powell Symphony Hall, 718 North Grand Boulevard, St. Louis, Missouri.

DRPLUS

    Through DRPlus -- Ameren's dividend reinvestment and stock purchase plan --
stockholders, customers and employees of Ameren and its subsidiaries can:

- -   make cash investments by check or automatic cash payment, totaling up to
    $120,000, in Ameren common stock annually

- -   reinvest their dividends in Ameren common stock -- or receive Ameren
    dividends in cash

- -   place Ameren common stock certificates in safekeeping and receive regular
    account statements.

    If you have not yet exchanged your Union Electric or CIPSCO common stock
certificates for Ameren common stock certificates, please contact the Investor
Services Department.

    This is not an offer to sell, or a solicitation of an offer to buy, any
securities.

DIRECT DEPOSIT OF DIVIDENDS

    All registered Ameren common and Union Electric and CIPS preferred
stockholders can have their cash dividends automatically credited to their bank
accounts. This service gives stockholders immediate access to their dividend on
the dividend payment date and eliminates the possibility of lost or stolen
dividend checks.

AMEREN'S WEB SITE

    To obtain AEE's daily stock price, recent financial statistics and other
information about the company, visit Ameren's home page on the internet.
Ameren's web site address is: http://www.ameren.com

INVESTOR SERVICES

    The company's Investor Services representatives are available to help you
each business day from 7:30 a.m. to 4:30 p.m. (central time). Please write or
call:

Ameren Services Company
Investor Services Department
P.O. Box 66887
St. Louis, MO 63166-6887

St. Louis area 554-3502
Toll-free 1-800-255-2237

OFFICE

One Ameren Plaza
1901 Chouteau Avenue
St. Louis, MO 63103
314-621-3222

STOCK AND FIRST MORTGAGE
BOND TRANSFER AGENT
AND REGISTRAR

Ameren Services Company


                                                       Positioned for Success 49

<PAGE>   1
                                                                      Exhibit 21

                       SUBSIDIARIES OF AMEREN CORPORATION

<TABLE>
<CAPTION>
                                                                   State or Jurisdiction
Name                                                                  of Incorporation
- ----                                                                  ----------------
<S>                                                                <C>
Ameren Corporation                                                        Missouri

    Ameren Development Company                                            Missouri
        Ameren ERC, Inc.                                                  Missouri

    Ameren Energy, Inc.                                                   Missouri
    Ameren Services Company                                               Missouri

    Central Illinois Public Service Company (dba Ameren CIPS)             Illinois
        Illinois Steam Inc.                                               Illinois
        CIPS Energy Inc.                                                  Illinois
        Electric Energy, Inc.(1)                                         Illinois

    CIPSCO Investment Company                                             Illinois
        CIPSCO Securities Company                                         Illinois
        CIPSCO Leasing Company                                            Illinois
            CLC Aircraft Leasing Company                                  Illinois
            CLC Leasing Company A                                         Illinois
            CLC Leasing Company B                                         Illinois
            CLC Leasing Company C                                         Illinois
        CIPSCO Energy Company                                             Illinois
            CEC-PGE-G Co.                                                 Illinois
            CEC-PGE-L Co.                                                 Illinois
            CEC-APL-G Co.                                                 Illinois
            CEC-APL-L Co.                                                 Illinois
            CEC-PSPL-G Co.                                                Illinois
            CEC-PSPL-L Co.                                                Illinois
            CEC-MPS-G Co.                                                 Illinois
            CEC-MPS-L Co.                                                 Illinois
            CEC-ACE-G Co.                                                 Illinois
            CEC-ACE-L Co.                                                 Illinois
            CEC-ACLP Co.                                                  Illinois
        CIPSCO Venture Company                                            Illinois

    Union Electric Company (dba AmerenUE)                                 Missouri
        Union Electric Development Company                                Missouri
        Electric Energy, Inc.(2)                                          Illinois
</TABLE>

- --------

    1   Central Illinois Public Service Company owns 20% of the common stock.

    2   Union Electric Company owns 40% of the common stock.

<PAGE>   1
                                                                      Exhibit 23





                       CONSENT OF INDEPENDENT ACCOUNTANTS





We hereby consent to the incorporation by reference in the Prospectus
constituting part of the Registration Statement on Form S-3 (No. 33-43721) and
the Registration Statement on Form S-8 (No. 333-43737) of Ameren Corporation of
our report dated February 5, 1998, which appears on page 17 of Ameren
Corporation's 1997 Annual Report to Shareholders, which is incorporated by
reference in this Annual Report on Form 10-K. We also consent to the
incorporation by reference of our report on the Financial Statement Schedule,
which appears on page 10 of this Form 10-K.




/s/ Price Waterhouse LLP

PRICE WATERHOUSE LLP
St. Louis, Missouri
March 30, 1998

<PAGE>   1
                                                                      EXHIBIT 24


                   CERTIFIED COPY OF RESOLUTION ADOPTED AT THE
                  REGULAR MEETING OF THE BOARD OF DIRECTORS OF
                               AMEREN CORPORATION
                        HELD ON FRIDAY, FEBRUARY 13, 1998


         RESOLVED, that the proper officers and the directors of this Company be
and hereby are authorized and directed to execute the 1997 Annual Report Form
10- K ("Form 10-K") and such amendments thereto as they may deem necessary or
desirable; that the name of any officer or director of the Company required to
sign such Form 10-K or any amendment thereto, may be signed by C. W. Mueller
and/or Donald E. Brandt and/or James C. Thompson, and/or the duly appointed
substitute thereof, pursuant to duly executed powers of attorney providing said
named persons with, among other things, full power of substitution and
revocation; and that the officers of this Company be and hereby are authorized
and directed to file such Form 10-K and any amendments thereto with the
Securities and Exchange Commission when executed by or on behalf of the proper
officers and the directors of the Company.

                                             I hereby certify that the foregoing
                                    is a true and correct copy of resolution
                                    adopted at the regular meeting of the Board
                                    of Directors of Ameren Corporation, held
                                    pursuant to due notice on Friday, February
                                    13, 1998 at the General Office Building of
                                    the Company, St. Louis, Missouri, and that
                                    such resolution is still in full force and
                                    effect.

                                    March 30, 1998



                                           /s/ James C. Thompson
                                                 Secretary


[CORPORATE SEAL]
<PAGE>   2
                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Donald E. Brandt
hereby appoints Charles W. Mueller and/or James C. Thompson the true and lawful
attorneys-in-fact of the undersigned, for and in the name, place and stead of
the undersigned, to affix the name of the undersigned as Senior Vice President
(Principal Accounting and Financial Officer) of Ameren Corporation to the 1997
Annual Report Form 10-K and any amendments thereto to be filed with the
Securities and Exchange Commission under the Securities Exchange Act of 1934,
and, for the performance of the same acts, each with power to appoint in his
place and stead and as his substitute, one or more attorneys-in-fact for the
undersigned, with full power of revocation; hereby ratifying and confirming all
that said attorneys-in-fact may do by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 16th day of March, 1998.

                                        /s/ Donald E. Brandt (L.S.)
                                        ---------------------------

STATE OF MISSOURI             )
                              )  SS.
CITY OF ST. LOUIS             )

         On this 16th day of March, 1998, before me, the undersigned Notary
Public in and for said State, personally appeared Donald E. Brandt, known to me
to be the person described in and who executed the foregoing power of attorney
and acknowledged to me that he executed the same as his free act and deed for
the purposes therein stated.

         IN TESTIMONY WHEREOF, I have hereunto set my hand and affixed my
official seal.

                                                /s/ Barbara Lungwitz
                                         -----------------------------------
                                                   BARBARA LUNGWITZ
                                             NOTARY PUBLIC - NOTARY SEAL
                                                  STATE OF MISSOURI
                                                  CITY OF ST. LOUIS
                                         MY COMMISSION EXPIRES SEPT. 2, 1999
<PAGE>   3
                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Charles W. Mueller
hereby appoints Donald E. Brandt and/or James C. Thompson the true and lawful
attorneys-in-fact of the undersigned, for and in the name, place and stead of
the undersigned, to affix the name of the undersigned as President (Principal
Executive Officer) and a Director of Ameren Corporation to the 1997 Annual
Report Form 10-K and any amendments thereto to be filed with the Securities and
Exchange Commission under the Securities Exchange Act of 1934, and, for the
performance of the same acts, each with power to appoint in his place and stead
and as his substitute, one or more attorneys-in-fact for the undersigned, with
full power of revocation; hereby ratifying and confirming all that said
attorneys-in-fact may do by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 16th day of March, 1998.

                                          /s/ C. W. Mueller (L.S.)
                                          ------------------------

STATE OF MISSOURI             )
                              )  SS.
CITY OF ST. LOUIS             )

         On this 16th day of March, 1998, before me, the undersigned Notary
Public in and for said State, personally appeared Charles W. Mueller, known to
me to be the person described in and who executed the foregoing power of
attorney and acknowledged to me that he executed the same as his free act and
deed for the purposes therein stated.

         IN TESTIMONY WHEREOF, I have hereunto set my hand and affixed my
official seal.

                                                   /s/ Barbara Lungwitz
                                            -----------------------------------
                                                      BARBARA LUNGWITZ
                                                NOTARY PUBLIC - NOTARY SEAL
                                                     STATE OF MISSOURI
                                                     CITY OF ST. LOUIS
                                            MY COMMISSION EXPIRES SEPT. 2, 1999
<PAGE>   4
                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned William E.
Cornelius hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or
James C. Thompson the true and lawful attorneys-in-fact of the undersigned, for
and in the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to the 1997 Annual Report Form
10-K and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Exchange Act of 1934, and, for the performance
of the same acts, each with power to appoint in his place and stead and as his
substitute, one or more attorneys-in-fact for the undersigned, with full power
of revocation; hereby ratifying and confirming all that said attorneys-in-fact
may do by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 16th day of March, 1998.

                                            /s/ W. E. Cornelius (L.S.)
                                            --------------------------

STATE OF MISSOURI             )
                              )  SS.
CITY OF ST. LOUIS             )

         On this 16th day of March, 1998, before me, the undersigned Notary
Public in and for said State, personally appeared William E. Cornelius, known to
me to be the person described in and who executed the foregoing power of
attorney and acknowledged to me that he executed the same as his free act and
deed for the purposes therein stated.

         IN TESTIMONY WHEREOF, I have hereunto set my hand and affixed my
official seal.

                                                   /s/ Barbara Lungwitz
                                            -----------------------------------
                                                      BARBARA LUNGWITZ
                                                NOTARY PUBLIC - NOTARY SEAL
                                                     STATE OF MISSOURI
                                                     CITY OF ST. LOUIS
                                            MY COMMISSION EXPIRES SEPT. 2, 1999
<PAGE>   5
                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Richard A. Liddy
hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or James C.
Thompson the true and lawful attorneys-in-fact of the undersigned, for and in
the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to the 1997 Annual Report Form
10-K and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Exchange Act of 1934, and, for the performance
of the same acts, each with power to appoint in his place and stead and as his
substitute, one or more attorneys-in-fact for the undersigned, with full power
of revocation; hereby ratifying and confirming all that said attorneys-in-fact
may do by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 16th day of March, 1998.

                                          /s/ Richard A. Liddy (L.S.)
                                          ---------------------------

STATE OF MISSOURI             )
                              )  SS.
CITY OF ST. LOUIS             )

         On this 16th day of March, 1998, before me, the undersigned Notary
Public in and for said State, personally appeared Richard A. Liddy, known to me
to be the person described in and who executed the foregoing power of attorney
and acknowledged to me that he executed the same as his free act and deed for
the purposes therein stated.

         IN TESTIMONY WHEREOF, I have hereunto set my hand and affixed my
official seal.


                                               /S/   BETTY J. OLSCHER
                                           --------------------------------
                                              NOTARY PUBLIC - NOTARY SEAL
                                                  STATE OF MISSOURI
                                                   ST. LOUIS COUNTY
                                           MY COMMISSION EXP. MAR. 14, 2001
<PAGE>   6
                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Paul L. Miller,
Jr. hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or James C.
Thompson the true and lawful attorneys-in-fact of the undersigned, for and in
the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to the 1997 Annual Report Form
10-K and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Exchange Act of 1934, and, for the performance
of the same acts, each with power to appoint in his place and stead and as his
substitute, one or more attorneys-in-fact for the undersigned, with full power
of revocation; hereby ratifying and confirming all that said attorneys-in-fact
may do by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 16th day of March, 1998.

                                              /s/ Paul L. Miller, Jr. (L.S.)
                                              ------------------------------

STATE OF MISSOURI             )
                              )  SS.
CITY OF ST. LOUIS             )

         On this 16th day of March, 1998, before me, the undersigned Notary
Public in and for said State, personally appeared Paul L. Miller, Jr., known to
me to be the person described in and who executed the foregoing power of
attorney and acknowledged to me that he executed the same as his free act and
deed for the purposes therein stated.

         IN TESTIMONY WHEREOF, I have hereunto set my hand and affixed my
official seal.

                                                   /s/ Barbara Lungwitz
                                            -----------------------------------
                                                      BARBARA LUNGWITZ
                                                NOTARY PUBLIC - NOTARY SEAL
                                                     STATE OF MISSOURI
                                                     CITY OF ST. LOUIS
                                            MY COMMISSION EXPIRES SEPT. 2, 1999
<PAGE>   7
                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Robert H. Quenon
hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or James C.
Thompson the true and lawful attorneys-in-fact of the undersigned, for and in
the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to the 1997 Annual Report Form
10-K and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Exchange Act of 1934, and, for the performance
of the same acts, each with power to appoint in his place and stead and as his
substitute, one or more attorneys-in-fact for the undersigned, with full power
of revocation; hereby ratifying and confirming all that said attorneys-in-fact
may do by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 11th day of March, 1998.

                                               /s/ Robert H. Quenon (L.S.)
                                               ---------------------------

STATE OF MISSOURI             )
                              )  SS.
CITY OF ST. LOUIS             )

         On this 11th day of March, 1998, before me, the undersigned Notary
Public in and for said State, personally appeared Robert H. Quenon, known to me
to be the person described in and who executed the foregoing power of attorney
and acknowledged to me that he executed the same as his free act and deed for
the purposes therein stated.

         IN TESTIMONY WHEREOF, I have hereunto set my hand and affixed my
official seal.

                                                   /s/ Barbara Lungwitz
                                            -----------------------------------
                                                      BARBARA LUNGWITZ
                                                NOTARY PUBLIC - NOTARY SEAL
                                                     STATE OF MISSOURI
                                                     CITY OF ST. LOUIS
                                            MY COMMISSION EXPIRES SEPT. 2, 1999
<PAGE>   8
                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Harvey Saligman
hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or James C.
Thompson the true and lawful attorneys-in-fact of the undersigned, for and in
the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to the 1997 Annual Report Form
10-K and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Exchange Act of 1934, and, for the performance
of the same acts, each with power to appoint in his place and stead and as his
substitute, one or more attorneys-in-fact for the undersigned, with full power
of revocation; hereby ratifying and confirming all that said attorneys-in-fact
may do by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 11th day of March, 1998.

                                           /s/ Harvey Saligman (L.S.)
                                           --------------------------

STATE OF MISSOURI             )
                              )  SS.
CITY OF ST. LOUIS             )

         On this 11th day of March, 1998, before me, the undersigned Notary
Public in and for said State, personally appeared Harvey Saligman, known to me
to be the person described in and who executed the foregoing power of attorney
and acknowledged to me that he executed the same as his free act and deed for
the purposes therein stated.

         IN TESTIMONY WHEREOF, I have hereunto set my hand and affixed my
official seal.

                                                   /s/ Theresa M. White
                                           -----------------------------------
                                                     THERESA M. WHITE
                                            NOTARY PUBLIC - STATE OF MISSOURI
                                                     ST. LOUIS COUNTY
                                           MY COMMISSION EXPIRES AUG. 10, 2001
<PAGE>   9
                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Janet McAfee
Weakley hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or James
C. Thompson the true and lawful attorneys-in-fact of the undersigned, for and in
the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to the 1997 Annual Report Form
10-K and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Exchange Act of 1934, and, for the performance
of the same acts, each with power to appoint in his place and stead and as his
substitute, one or more attorneys-in-fact for the undersigned, with full power
of revocation; hereby ratifying and confirming all that said attorneys-in-fact
may do by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto set her hand and seal
this 11th day of March, 1998.

                                            /s/ Janet M. Weakley (L.S.)
                                            ---------------------------

STATE OF MISSOURI             )
                              )  SS.
CITY OF ST. LOUIS             )

         On this 11th day of March, 1998, before me, the undersigned Notary
Public in and for said State, personally appeared Janet McAfee Weakley, known to
me to be the person described in and who executed the foregoing power of
attorney and acknowledged to me that she executed the same as her free act and
deed for the purposes therein stated.

         IN TESTIMONY WHEREOF, I have hereunto set my hand and affixed my
official seal.

                                                    /s/ Kathleen D. O'Reilly
                                              ----------------------------------
                                                      KATHLEEN D. O'REILLY
                                                  NOTARY PUBLIC - NOTARY SEAL
                                                      STATE OF MISSOURI
                                                      ST. LOUIS COUNTY
                                              MY COMMISSION EXPIRES JUNE 3, 2001
<PAGE>   10
                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Charles J. Schukai
hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or James C.
Thompson the true and lawful attorneys-in-fact of the undersigned, for and in
the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to the 1997 Annual Report Form
10-K and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Exchange Act of 1934, and, for the performance
of the same acts, each with power to appoint in his place and stead and as his
substitute, one or more attorneys-in-fact for the undersigned, with full power
of revocation; hereby ratifying and confirming all that said attorneys-in-fact
may do by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 16th day of March, 1998.

                                               /s/ Charles J. Schukai (L.S.)
                                               -----------------------------

STATE OF MISSOURI             )
                              )  SS.
CITY OF ST. LOUIS             )

         On this 16th day of March, 1998, before me, the undersigned Notary
Public in and for said State, personally appeared Charles J. Schukai, known to
me to be the person described in and who executed the foregoing power of
attorney and acknowledged to me that he executed the same as his free act and
deed for the purposes therein stated.

         IN TESTIMONY WHEREOF, I have hereunto set my hand and affixed my
official seal.

                                                   /s/ Barbara Lungwitz
                                            -----------------------------------
                                                      BARBARA LUNGWITZ
                                                NOTARY PUBLIC - NOTARY SEAL
                                                     STATE OF MISSOURI
                                                     CITY OF ST. LOUIS
                                            MY COMMISSION EXPIRES SEPT. 2, 1999
<PAGE>   11
                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned James W. Wogsland
hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or James C.
Thompson the true and lawful attorneys-in-fact of the undersigned, for and in
the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to the 1997 Annual Report Form
10-K and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Exchange Act of 1934, and, for the performance
of the same acts, each with power to appoint in his place and stead and as his
substitute, one or more attorneys-in-fact for the undersigned, with full power
of revocation; hereby ratifying and confirming all that said attorneys-in-fact
may do by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 19th day of March, 1998.

                                                  /s/ James W. Wogsland (L.S.)
                                                  ----------------------------

STATE OF MISSOURI             )
                              )  SS.
CITY OF ST. LOUIS             )

         On this 19th day of March, 1998, before me, the undersigned Notary
Public in and for said State, personally appeared James W. Wogsland, known to me
to be the person described in and who executed the foregoing power of attorney
and acknowledged to me that he executed the same as his free act and deed for
the purposes therein stated.

         IN TESTIMONY WHEREOF, I have hereunto set my hand and affixed my
official seal.

                                                   /s/ Barbara Lungwitz
                                            -----------------------------------
                                                      BARBARA LUNGWITZ
                                                NOTARY PUBLIC - NOTARY SEAL
                                                     STATE OF MISSOURI
                                                     CITY OF ST. LOUIS
                                            MY COMMISSION EXPIRES SEPT. 2, 1999
<PAGE>   12
                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Gordon R. Lohman
hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or James C.
Thompson the true and lawful attorneys-in-fact of the undersigned, for and in
the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to the 1997 Annual Report Form
10-K and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Exchange Act of 1934, and, for the performance
of the same acts, each with power to appoint in his place and stead and as his
substitute, one or more attorneys-in-fact for the undersigned, with full power
of revocation; hereby ratifying and confirming all that said attorneys-in-fact
may do by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 19th day of March, 1998.

                                         /s/ Gordon R. Lohman (L.S.)
                                         ---------------------------

STATE OF MISSOURI             )
                              )  SS.
CITY OF ST. LOUIS             )

              On this 19th day of March, 1998, before me, the undersigned Notary
Public in and for said State, personally appeared Gordon R. Lohman, known to me
to be the person described in and who executed the foregoing power of attorney
and acknowledged to me that he executed the same as his free act and deed for
the purposes therein stated.

              IN TESTIMONY WHEREOF, I have hereunto set my hand and affixed my
official seal.

                                                   /s/ Barbara Lungwitz
                                            -----------------------------------
                                                      BARBARA LUNGWITZ
                                                NOTARY PUBLIC - NOTARY SEAL
                                                     STATE OF MISSOURI
                                                     CITY OF ST. LOUIS
                                            MY COMMISSION EXPIRES SEPT. 2, 1999
<PAGE>   13
                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Clifford L.
Greenwalt hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or
James C. Thompson the true and lawful attorneys-in-fact of the undersigned, for
and in the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to the 1997 Annual Report Form
10-K and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Exchange Act of 1934, and, for the performance
of the same acts, each with power to appoint in his place and stead and as his
substitute, one or more attorneys-in-fact for the undersigned, with full power
of revocation; hereby ratifying and confirming all that said attorneys-in-fact
may do by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 16th day of March, 1998.

                                               /s/ C. L. Greenwalt (L.S.)
                                               --------------------------

STATE OF ILLINOIS                   )
                                    )  SS.
COUNTY OF SANGAMON                  )

         On this 16th day of March, 1998, before me, the undersigned Notary
Public in and for said State, personally appeared Clifford L. Greenwalt, known
to me to be the person described in and who executed the foregoing power of
attorney and acknowledged to me that he executed the same as his free act and
deed for the purposes therein stated.

         IN TESTIMONY WHEREOF, I have hereunto set my hand and affixed my
official seal.

                                              /s/ Janet K. Cooper
                                        --------------------------------
                                                "OFFICIAL SEAL"
                                                JANET K. COOPER
                                        NOTARY PUBLIC, STATE OF ILLINOIS
                                          MY COMMISSION EXPIRES 3/27/99
<PAGE>   14
                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Richard A. Lumpkin
hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or James C.
Thompson the true and lawful attorneys-in-fact of the undersigned, for and in
the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to the 1997 Annual Report Form
10-K and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Exchange Act of 1934, and, for the performance
of the same acts, each with power to appoint in his place and stead and as his
substitute, one or more attorneys-in-fact for the undersigned, with full power
of revocation; hereby ratifying and confirming all that said attorneys-in-fact
may do by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 23rd day of March, 1998.

                                             /s/ Richard A. Lumpkin (L.S.)
                                             -----------------------------

STATE OF ILLINOIS             )
                              )  SS.
COUNTY OF COLE                )

         On this 23rd day of March, 1998, before me, the undersigned Notary
Public in and for said State, personally appeared Richard A. Lumpkin, known to
me to be the person described in and who executed the foregoing power of
attorney and acknowledged to me that he executed the same as his free act and
deed for the purposes therein stated.

         IN TESTIMONY WHEREOF, I have hereunto set my hand and affixed my
official seal.

                                             /s/ Renee Spitz
                                    ----------------------------------
                                              OFFICIAL SEAL
                                               RENEE SPITZ
                                      NOTARY PUBLIC STATE OF ILLINOIS
                                    MY COMMISSION EXPIRES OCT. 1, 2000
<PAGE>   15
                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Hanne M. Merriman
hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or James C.
Thompson the true and lawful attorneys-in-fact of the undersigned, for and in
the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to the 1997 Annual Report Form
10-K and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Exchange Act of 1934, and, for the performance
of the same acts, each with power to appoint in his place and stead and as his
substitute, one or more attorneys-in-fact for the undersigned, with full power
of revocation; hereby ratifying and confirming all that said attorneys-in-fact
may do by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto set her hand and seal
this 18th day of March, 1998.

                                             /s/ Hanne M. Merriman (L.S.)
                                             ----------------------------

Commonwealth of Virginia            )
                                    )  SS.
County of Arlington                 )

         On this 18th day of March, 1998, before me, the undersigned Notary
Public in and for said State, personally appeared Hanne M. Merriman, known to me
to be the person described in and who executed the foregoing power of attorney
and acknowledged to me that she executed the same as her free act and deed for
the purposes therein stated.

         IN TESTIMONY WHEREOF, I have hereunto set my hand and affixed my
official seal.

                                                    /S/ PATRICIA M. CRIGLER
                                             -----------------------------------
                                             MY COMMISSION EXPIRES NOV. 30, 2000


[SEAL]

<TABLE> <S> <C>

<ARTICLE> OPUR1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
<BOOK-VALUE>                                 PRO-FORMA
<TOTAL-NET-UTILITY-PLANT>                    6,987,085
<OTHER-PROPERTY-AND-INVEST>                    219,626
<TOTAL-CURRENT-ASSETS>                         711,216
<TOTAL-DEFERRED-CHARGES>                        64,915
<OTHER-ASSETS>                                 844,705
<TOTAL-ASSETS>                               8,827,547
<COMMON>                                         1,372
<CAPITAL-SURPLUS-PAID-IN>                    1,582,938
<RETAINED-EARNINGS>                          1,434,658
<TOTAL-COMMON-STOCKHOLDERS-EQ>               3,018,968
                                0
                                    235,197
<LONG-TERM-DEBT-NET>                         2,416,686
<SHORT-TERM-NOTES>                              86,266
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                       0
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                            0
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                     12,532
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