AMEREN CORP
10-K, 2000-03-30
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>   1

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549
                                    FORM 10-K
                (X) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                   FOR THE FISCAL YEAR ENDED DECEMBER 31, 1999
                                       OR
              ( ) Transition report pursuant to Section 13 or 15(d)
                     of the Securities Exchange Act of 1934
                       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
of incorporation or organization)                                No.)

                 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:

   Title of each class                Name of each exchange on which registered
- -----------------------------         -----------------------------------------
Common Stock, $ .01 par value                   New York Stock Exchange


        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. [ ].

        Aggregate market value of voting stock held by non-affiliates as of
March 6, 2000, based on closing prices most recently available as reported in
The Wall Street Journal: $3,867,760,835.

        Shares of Common Stock, $ .01 par value, outstanding as of March 6,
2000: 137,215,462 shares.

                      DOCUMENTS INCORPORATED BY REFERENCES.

        Portions of the registrant's 1999 Annual Report to Stockholders (the
"1999 Annual Report") are incorporated by reference into Parts I, II and IV.

        Portions of the registrant's definitive proxy statement for the 2000
annual meeting are incorporated by reference into Part III.

<PAGE>   2


                                TABLE OF CONTENTS
<TABLE>
<CAPTION>


PART I                                                                                                    PAGE
                                                                                                          ----
<S>         <C>                                                                                           <C>
Item  1    -  Business
                    General...............................................................................    1
                    Capital Program and Financing.........................................................    2
                    Rates.................................................................................    3
                    Fuel Supply...........................................................................    3
                    Regulation............................................................................    4
                    Industry Issues.......................................................................    6
                    Operating Statistics(1)...............................................................    6

Item  2    -  Properties..................................................................................    6
Item  3    -  Legal Proceedings...........................................................................    8
Item  4    -  Submission of Matters to a Vote of Security Holders(2)

Executive Officers of the Company (Item 401(b) of Regulation S-K).........................................    9

PART II

Item  5    -  Market for Registrant's Common Equity and Related
                    Stockholder Matters(1)................................................................   10
Item  6    -  Selected Financial Data(1)..................................................................   11
Item  7    -  Management's Discussion and Analysis of Financial Condition
                    and Results of Operations(1)..........................................................   11
Item  7A   -  Quantitative and Qualitative Disclosures about Market Risk(1)...............................   11
Item  8    -  Financial Statements and Supplementary Data(1)..............................................   11
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).......................................   11
Item 11    -  Executive Compensation(1)...................................................................   12
Item 12    -  Security Ownership of Certain Beneficial Owners
                    and Management(1).....................................................................   12
Item 13    -  Certain Relationships and Related Transactions(1)...........................................   12

PART IV

Item 14    -  Exhibits, Financial Statement Schedules and Reports on Form 8-K.............................   12

SIGNATURES................................................................................................   16
EXHIBITS..................................................................................................   17
</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 (Ameren or 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 (AmerenUE) combined with the result that the common
shareholders of CIPSCO and AmerenUE became the common shareholders of the
Company, and the Company became the owner of 100% of the common stock of
AmerenUE and CIPSCO's utility operating subsidiary, Central Illinois Public
Service Company (AmerenCIPS) (the Merger).

               For additional information about the Merger, see "Overview" in
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" and Notes 1 and 2 to the "Notes to Consolidated Financial
Statements" on Pages 15, 28, and 29, respectively, of the 1999 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 utility operating subsidiaries, AmerenCIPS and AmerenUE. Dividends on
Ameren's Common Stock are dependent on distributions to be made to it by
AmerenCIPS, AmerenUE, and its other subsidiaries. The 1999 Annual Reports Form
10-K for AmerenCIPS and AmerenUE are available from the Company upon request.

               AmerenCIPS 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. AmerenUE 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.

               On a consolidated basis, 93.3% of the Company's 1999 operating
revenues were derived from the sale of electric energy, 6.5% came from the sale
of natural gas, and 0.2% came from other sources. Consolidated electric
operating revenues as a percentage of total operating revenues for the years
1998 and 1997 were 93.3% and 92%, respectively.

               The Company also owns all of the common stock of other subsidiary
companies as follows: (a) CIPSCO Investment Company, a nonregulated 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 and all of its subsidiaries; (c)
AmerenEnergy, Inc., a Missouri corporation which primarily serves as a power
marketing agent for the operating utility companies and provides a range of
energy and risk management services to targeted customers; (d) Ameren
Development Company, a nonregulated holding company incorporated in Missouri
encompassing Ameren's nonregulated products and services; and (e) Ameren Energy
Resources Company (until March 2000, known as Ameren Intermediate Holding Co.,
Inc.), a nonregulated Illinois holding company for an Illinois nonregulated
generating subsidiary (Ameren Energy Generating Company) and its marketing
affiliate (Ameren Energy Marketing Company) scheduled to be operational in May
2000. In addition, through its operating subsidiaries, the Company owns 60% of
the Common Stock of Electric Energy, Inc., which owns and operates a generating
plant with a nominal capacity of 1,000 mW. Of the plant's total output, 50% is
committed to the Department of Energy, 15% to AmerenUE, 7.5% to AmerenCIPS, and
the remainder to its other owners.

                                       1
<PAGE>   4

               At December 31, 1999, the Company and its subsidiaries had 7,347
employees. Approximately 70% of such employees are represented by local unions
affiliated with the AFL-CIO. New contracts with collective bargaining units
representing approximately 60% of these employees were ratified in 1999 with
terms expiring in 2002. Labor agreements which expired in 1999 have not been
renewed with International Brotherhood of Electrical Workers (IBEW) Locals 1439,
309, 649 and 1455, who collectively represent approximately 2,000 employees.
Negotiations with Local 1455 are still ongoing. However, after engaging in
extensive good-faith bargaining with IBEW Locals 1439, 309 and 649, the Company
submitted a last, best and final offer to these collective bargaining units on
February 2, 2000. The offer was rejected and the Company informed these locals
that it would implement the noneconomic portion of its offer effective March 6,
2000. The employees are currently working under the noneconomic portion of the
Company's last, best and final offer. The Company is unable to predict what
further action, if any, these collective bargaining units will take or the
response of the Company's other union represented employees to any action by its
employees. The Company is also unable to determine what, if any, impact these
labor matters could have on its future financial condition, results of
operations or liquidity. For more information on labor agreements and other
labor matters, see Note 12 to the "Notes to Consolidated Financial Statements"
on Page 38 of the 1999 Annual Report pages incorporated herein by reference.

               For additional information regarding the Company's business
operations, see "Regulation" section below and "Management's Discussion and
Analysis" on Pages 15-22 and the Consolidated Financial Information on Pages
23-45 of the 1999 Annual Report pages incorporated herein by reference.


                          CAPITAL PROGRAM AND FINANCING

               The Company is engaged in a capital program under which capital
expenditures are expected to approximate $749 million in 2000. During 1999, the
Company committed to purchase combustion turbine generators which will add more
than 2,700 megawatts to its net peaking capacity and are expected to cost
approximately $1.2 billion. Except for nearly 200 megawatts, the new capacity is
expected to be operated by Ameren Energy Generating Company, the new Illinois
nonregulated generating subsidiary. For the five-year period 2000 through 2004,
construction expenditures are estimated at $3.3 billion. This estimate includes
capital expenditures for the purchase of the new combustion turbine generators,
as well as expenditures that will be incurred by the Company to meet new air
quality standards for ozone and particulate matter.

               In addition to the funds required for construction during the
2000-2004 period, $897 million will be required to repay long-term debt as
follows: $129 million in 2000; $45 million in 2001; $275 million in 2002; $160
million in 2003; and $288 million in 2004. Amounts for years subsequent to 2000
do not include AmerenUE's nuclear fuel lease payments since the amounts of such
payments are not currently determinable.

               To issue first mortgage bonds and preferred stock, AmerenCIPS and
AmerenUE each must comply with earnings tests contained in their respective
mortgages and Articles of Incorporation. 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 AmerenCIPS 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 AmerenUE'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 capital program and
financial needs, see "Liquidity and Capital Resources" in "Management's
Discussion and Analysis of Financial Condition



                                       2
<PAGE>   5


and Results of Operations" on Page 17, and Notes 5, 7, 8, and 12 to the "Notes
to Consolidated Financial Statements" on Pages 32, 33, 34 and 38, of the 1999
Annual Report pages incorporated herein by reference.

                                      RATES

               For the year 1999, approximately 61%, 23%, and 16% 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. For information on rate matters in these
jurisdictions, see "Electric Industry Restructuring" in "Management's Discussion
and Analysis of Financial Condition and Results of Operations" and Note 2 to the
"Notes to Consolidated Financial Statements" on Pages 19 and 29, respectively,
of the 1999 Annual Report pages incorporated herein by reference.

               Reference is being made to Note 2 (Missouri Electric) to the
"Notes to Consolidated Financial Statements" on Page 29 of the 1999 Annual
Report pages incorporated herein by reference for a discussion of the December
1999 Report and Order (Order) of the MoPSC relating to or impacting customer
credits under AmerenUE's original and new experimental electric alternative
regulation plans. On February 24, 2000, AmerenUE filed a Petition for Writ of
Review with the Circuit Court of Cole County, Missouri asking that the MoPSC's
Order be reversed. AmerenUE has also requested that the court issue a stay of
the Order. While it is unable to predict the ultimate outcome of the judicial
appeal of the MoPSC's Order, Ameren believes that the final decision will not
have a material adverse effect on its financial position, results of operations
or liquidity.

               Further reference is being made to Note 2 (Illinois Electric
Restructuring) to the "Notes to Consolidated Financial Statements" for a
discussion of the August 1999 order of the ICC approving the delivery service
tariffs filed by AmerenUE and AmerenCIPS and the rehearing of that order granted
by the ICC on certain issues. The ICC issued an order in 2000 on this reopened
proceeding resolving all outstanding issues.

               In February 2000, AmerenUE filed a request with the MoPSC to
increase rates approximately $12 million annually for natural gas service in its
Missouri jurisdiction. The MoPSC has until January 2001 to render a decision.




<TABLE>
<CAPTION>

                                   FUEL SUPPLY

COST OF FUELS                                                                  YEAR
- -------------                            ------------------------------------------------------------------------------
                                             1999             1998             1997           1996           1995
                                             ----             ----             ----           ----           ----
<S>                                       <C>              <C>             <C>             <C>             <C>
AMERENUE
- --------
Per Million BTU     - Coal                 100.685(cent)   100.015(cent)   105.600(cent)   112.250(cent)  117.645(cent)
                    - Nuclear               46.552(cent)    48.803(cent)    47.472(cent)    47.499(cent)   48.592(cent)
                    - System                89.833(cent)    90.378(cent)    92.816(cent)    96.596(cent)  101.590(cent)

AMERENCIPS
- ----------
Per Million BTU     - System (Coal)        139.700(cent)   152.738(cent)   163.000(cent)   171.000(cent)  176.000(cent)
</TABLE>


               OIL. The actual and prospective use of such fuel is minimal, and
the Company has not experienced and does not expect to experience difficulty in
obtaining adequate supplies.

               GAS. The combustion turbine generators which the Company has
committed to purchase (see "Capital Program and Financing" section above) will
be fueled by natural gas. Consequently, the prospective use of natural gas to
supply such facilities is expected to increase significantly. The Company does
not expect to experience difficulty in obtaining adequate supplies to support
the new generation facilities.



                                       3
<PAGE>   6



               COAL. Because of uncertainties of supply due to potential work
stoppages, equipment breakdowns and other factors, the Company has a policy of
maintaining a coal inventory consistent with its expected burn practices.

               NUCLEAR. The components of the nuclear fuel cycle required for
nuclear generating units are as follows: (1) uranium; (2) conversion of uranium
into uranium hexafluoride; (3) enrichment of uranium hexafluoride; (4)
conversion of enriched uranium hexafluoride into uranium dioxide and the
fabrication into nuclear fuel assemblies; and (5) disposal and/or reprocessing
of spent nuclear fuel.

               The Company has agreements and/or inventories to fulfill its
Callaway Nuclear Plant needs for uranium, enrichment, fabrication and conversion
services through 2002. 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 refueling at 18-month intervals, with the next regular refueling
presently scheduled for the spring of 2001.

               Under the Nuclear Waste Policy Act of 1982, the U. S. Department
of Energy (DOE) 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. The Company has
sufficient storage capacity at the Callaway site until 2020 and has the
capability for additional storage capacity through the licensed life of the
plant in 2024. The delayed availability of the DOE's disposal facility is not
expected to adversely affect the continued operation of Callaway Plant.

               For additional information on the Company's "Fuel Supply", see
"Results of Operations" in "Management's Discussion and Analysis of Financial
Condition and Results of Operations" and Notes 12 and 13 to the "Notes to
Consolidated Financial Statements" on Pages 15, 38 and 41, respectively, of the
1999 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.

               AmerenCIPS and AmerenUE 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.

               For information on regulatory matters in these jurisdictions,
including the current status of electric utility restructuring in Illinois and
Missouri, see "Electric Industry Restructuring" in "Management's Discussion and
Analysis of Financial Condition and Results of Operations" and Note 2 to the
"Notes to Consolidated Financial Statements" on Pages 19 and 29, respectively,
of the 1999 Annual Report pages incorporated herein by reference.

               Reference is being made to "Electric Industry Restructuring" in
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" and Note 2 (Illinois Electric Restructuring) to the "Notes to
Consolidated Financial Statements" on Pages 19 and 29, respectively, of the 1999
Annual Report pages incorporated herein by reference, for a discussion of
AmerenCIPS' transfer of its





                                       4


<PAGE>   7





generating facilities to a new nonregulated subsidiary of Ameren. In conjunction
with Illinois' Electric Service Customer Choice and Rate Relief Law of 1997, in
July 1999, AmerenCIPS filed a notice with the ICC that it intends to transfer
AmerenCIPS' generating facilities (all in Illinois) to a new nonregulated
subsidiary of the Company. The formation of the new generating subsidiary, as
well as the transfer of AmerenCIPS' generating assets and liabilities (at
historical net book value of approximately $600 million) and certain power sales
contracts, was subject to various regulatory approvals from the ICC, the FERC,
and the MoPSC, all of which have been received as of March 10, 2000. An
additional PUHCA-related determination that will permit the new generating
subsidiary to operate as an Exempt Wholesale Generator is being sought from the
FERC. The generating subsidiary (Ameren Energy Generating Company) will include
most of the new combustion turbine generators being acquired by the Company, in
addition to the AmerenCIPS facilities. The new generating subsidiary is expected
to be operational in May 2000. The proposed transfer of AmerenCIPS' generating
assets and liabilities had no effect on the Company's financial statements as of
December 31, 1999.

               Operation of the Company'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. The Company'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. The Company'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.

               Ameren and its subsidiaries are regulated, in certain of their
operations, by air and water pollution and hazardous waste regulations at the
city, county, state and federal levels. These companies are in substantial
compliance with existing regulations.

               ENVIRONMENTAL ISSUES. On December 22, 1995, a complaint was filed
in the Circuit Court for the Seventh Judicial Circuit, Sangamon County, Illinois
against AmerenCIPS and several other defendants. The complaint sought
unspecified monetary damages and alleged that, as a result of exposure to
carcinogens contained in coal tar at the AmerenCIPS Taylorville gas plant site,
plaintiffs' children had suffered from a rare form of childhood cancer known as
"neuroblastoma". In 1998, a jury awarded plaintiffs $3.2 million. In March 2000,
the Illinois Appellate Court, on an appeal by AmerenCIPS, upheld the plaintiffs'
verdict. AmerenCIPS plans to seek an appeal of the court's decision to the
Illinois Supreme Court. The Company believes that final disposition of this
matter will not have a material adverse effect on the financial position,
results of operations or liquidity of the Company.

               On August 2, 1996, the Illinois Attorney General filed a
complaint with the Illinois Pollution Control Board alleging various violations
of wastewater discharge permit conditions and ground water standards at
AmerenCIPS' Hutsonville Power Station. The complaint seeks monetary penalties
and the award of attorney fees. AmerenCIPS, the Illinois Environmental
Protection Agency and the Attorney General have reached a settlement in
principle resolving the complaint which will require the Company to perform
remedial actions at the site. Any final settlement of this matter must be
approved by the Illinois Pollution Control Board. While the Company cannot
predict the final outcome of this matter, it does not believe that the final
resolution will have a material adverse effect on financial position, results of
operations or liquidity of the Company.

               For additional discussion of environmental matters, see
"Liquidity and Capital Resources" in Management's Discussion and Analysis of
Financial Condition and Results of Operations" and Note 12 to the "Notes to
Consolidated Financial Statements" on Pages 17 and 38, respectively, of the 1999
Annual Report pages incorporated by reference. Reference is being made to these
1999 Annual Report pages for a discussion of regulations issued by the United
States Environmental Protection Agency (EPA) to reduce NOx emissions from
coal-fired boilers and other sources in 22 states, including Missouri and
Illinois (where all of the Company's coal-fired power plant boilers are
located). In March 2000, the U.S. Court of Appeals for the District of Columbia
substantially upheld the proposed NOx regulations but remanded

                                       5

<PAGE>   8


portions of them to the EPA for further consideration. The implementation date
of the regulations is uncertain and further legal challenge is possible. The
Company is unable to predict the outcome of the litigation, the regulation
implementation date or the ultimate impact of these standards on its future
financial condition, results of operations or liquidity.


                                 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 structure of the industry as a result of
changes in federal and state laws, including the formation of unregulated
generating entities; 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 "Electric Industry Restructuring" in "Management's
Discussion and Analysis of Financial Condition and Results of Operations" and
Notes 2 and 12 to the "Notes to Consolidated Financial Statements" on Pages 19
and 38, respectively, of the 1999 Annual Report pages incorporated herein by
reference.

               YEAR 2000 ISSUE. The Year 2000 Issue relates to how dates are
stored and used in computer systems, applications, and embedded systems. As the
century date change occurred, certain date-sensitive systems had to recognize
and properly treat the year as 2000 and not as 1900. This inability to recognize
and properly treat the year as 2000 could have caused these systems to process
critical financial and operational information incorrectly. The Company
encountered no significant problems associated with the Year 2000 Issue at
year-end. For additional information on this issue, see "Year 2000 Issue" in
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" on Page 20 of the 1999 Annual Report pages incorporated herein by
reference.


                              OPERATING STATISTICS

               The information on Pages 44 and 45 in the Company's 1999 Annual
Report is incorporated herein by reference.


ITEM 2.        PROPERTIES.

               In planning its construction program, the Company is presently
utilizing a forecast of kilowatthour sales growth of approximately 2.0% and peak
load growth of 1.5%, each compounded annually, and is providing for a minimum
reserve margin of approximately 15% above its anticipated peak load
requirements.

               The Company plans to add more than 2,700 megawatts to its net
peaking capacity with the purchase of combustion turbine generators (CTs). CTs
with a total capacity of approximately 590 megawatts are planned to be installed
in 2000, 560 megawatts in 2001, 590 megawatts in 2002, and 325 megawatts each in
2003 through 2005. For additional information, see Note 12 to the "Notes to
Consolidated Financial Statements" on Page 38 of the 1999 Annual Report pages
incorporated herein by reference.

               The Company is a member of one of the ten regional electric
reliability councils organized for coordinating the planning and operation of
the nation's bulk power supply - MAIN (Mid-America


                                       6

<PAGE>   9


Interconnected Network) operating primarily in Wisconsin, Illinois and Missouri.
The Company's bulk power system is operated as an Ameren-wide control area and
transmission system under the FERC approved Joint Dispatch Agreement between
AmerenUE and AmerenCIPS. Ameren has interconnections for transmission service
and the exchange of electric energy, directly and through the facilities of
others, with more than twenty power suppliers.

               The following table sets forth information with respect to the
Company's generating facilities and capability at the time of the expected 2000
peak.

<TABLE>
<CAPTION>

                                                                                       GROSS KILOWATT
             ENERGY                                                                       INSTALLED
             SOURCE              PLANT                    LOCATION                       CAPABILITY
             ------              -----                    --------                       ----------
             <S>               <C>                  <C>                               <C>
             Coal              Labadie              Franklin County, MO                  2,400,000
                               Rush Island          Jefferson County, MO                 1,224,000
                               Newton               Newton, IL                           1,170,000
                               Sioux                St. Charles County, MO               1,006,000
                               Meramec              St. Louis County, MO                   859,000
                               Coffeen              Coffeen, IL                            950,000
                               Meredosia            Meredosia, IL                          359,000
                               Grand Tower          Grand Tower, IL                        202,000
                               Hutsonville          Hutsonville, IL                        161,000
                                                                                      ------------

                                                               Total Coal                8,331,000

             Nuclear           Callaway             Callaway County, MO                  1,181,000

             Hydro             Osage                Lakeside, MO                           212,000
                               Keokuk               Keokuk, IA                             126,000
                                                                                      ------------

                                                               Total Hydro                 338,000

             Oil and           Venice               Venice, IL                             441,000
             Natural           Other                Various                              1,078,000*
                                                                                     -------------
             Gas                                               Total Oil and
                                                                 Natural Gas             1,519,000
             Pumped-
             storage           Taum Sauk            Reynolds County, MO                    440,000
                                                                                      ------------

                                                               TOTAL                    11,809,000
                                                                                      ============
</TABLE>


          *    Includes 517,000 gross kilowatt installed capability of new
               combustion turbine generators scheduled for service before the
               expected 2000 peak.

               As of December 31, 1999, AmerenCIPS owned approximately 4,700
circuit miles of electric transmission lines. AmerenCIPS operates one
propane-air plant and 4,800 miles of gas mains. As of that date, AmerenUE owned
approximately 3,300 circuit miles of electric transmission lines. AmerenUE
operates three propane-air plants and 2,800 miles of gas mains. Other properties
of the companies include distribution lines, underground cable, office
buildings, warehouses, garages and repair shops.

               Substantially all of the properties and plant of AmerenCIPS and
AmerenUE are subject to the direct first liens of the indentures securing their
first mortgage bonds. Pursuant to the Illinois electric restructuring
legislation enacted in December 1997 as the Electric Service Customer Choice and
Rate Relief Law of 1997, AmerenCIPS expects to transfer all of its generating
facilities and related assets to a new nonregulated generating subsidiary of
Ameren in May 2000. As a part of this transfer, AmerenCIPS' generating property
and plant will be released from the lien of the indenture securing its first
mortgage bonds. For additional information on this generating asset transfer,
see "Regulation" section under Item 1 herein and "Electric Industry
Restructuring" in "Management's Discussion and Analysis of Financial


                                       7

<PAGE>   10


Condition and Results of Operations" and Note 2 to the "Notes to Consolidated
Financial Statements" on Pages 19 and 30, respectively, of the 1999 Annual
Report pages incorporated herein by reference.


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. 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.

               For additional information on legal and administrative
proceedings, see "Rates" and "Regulation -- Environmental Issues" under Item 1
herein and "Electric Industry Restructuring" in "Management's Discussion and
Analysis of Financial Condition and Results of Operations" and Notes 2 and 12 to
the "Notes to Consolidated Financial Statements" on Pages 19, 29 and 38,
respectively, of the 1999 Annual Report pages incorporated herein by reference.

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

               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,
financial performance and the Year 2000 Issue. 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. The
following factors, in addition to those discussed elsewhere in this report and
in subsequent securities filings, could cause results to differ materially from
management expectations as suggested by such "forward-looking" statements: the
effects of regulatory actions; changes in laws and other governmental actions;
the impact on the Company of current regulations related to the phasing-in of
the opportunity for some customers to choose alternative energy suppliers in
Illinois; the effects of increased competition in the future due to, among other
things, deregulation of certain aspects of the Company's business at both the
state and Federal levels; future market prices for fuel and purchased power,
electricity, and natural gas, including the use of financial instruments;
average rates for electricity in the Midwest; business and economic conditions;
interest rates; weather conditions; fuel prices and availability; generation
plant performance; the impact of current environmental regulations on utilities
and generating companies and the expectation that more stringent requirements
will be introduced over time, which could potentially have a negative financial
effect; monetary and fiscal policies; future wages and employee benefits costs;
and legal and administrative proceedings.


                                       8

<PAGE>   11


INFORMATION REGARDING EXECUTIVE OFFICERS REQUIRED BY ITEM 401(B) OF REGULATION
S-K:


<TABLE>
<CAPTION>

                                                                                             DATE FIRST ELECTED
                                     AGE AT                                                    OR APPOINTED TO
         NAME                       12/31/99            PRESENT POSITION                       PRESENT POSITION
         ----                       --------            ----------------                       ----------------
<S>                                 <C>                 <C>                                  <C>
Ameren Corporation
- ------------------

Charles W. Mueller                      61              Chairman, President and
                                                        Chief Executive Officer,
                                                        and Director                                 12/31/97
Donald E. Brandt                        45              Senior Vice President                        12/31/97
Steven R. Sullivan                      39              Vice President, General Counsel                7/1/98
                                                        and Secretary                                  9/1/98
Warner L. Baxter                        38              Vice President                                 5/1/98
                                                        and Controller                               12/31/97
Jerre E. Birdsong                       45              Treasurer                                     4/23/96

AmerenUE (Subsidiary)
- ---------------------

Charles W. Mueller                      61              President,                                     7/1/93
                                                        Chief Executive Officer                        1/1/94
                                                        and Director                                  6/11/93
Donald E. Brandt                        45              Senior Vice President                          7/1/88
                                                        and Director                                  4/28/98
Daniel F. Cole                          46              Senior Vice President                         7/12/99
Thomas F. Voss                          52              Senior Vice President                          6/1/99
Warner L. Baxter                        38              Vice President,                                5/1/98
                                                        Controller and                                 8/1/96
                                                        Director                                      4/22/99
William J. Carr                         62              Vice President                                10/1/88
Michael J. Montana                      53              Vice President                                 7/1/88
Charles D. Naslund                      47              Vice President                                 2/1/99
Garry L. Randolph                       51              Vice President                                 3/1/91
William C. Shores                       61              Vice President                                 7/1/88
Steven R. Sullivan                      39              Vice President, General Counsel                7/1/98
                                                        and Secretary                                  9/1/98
Jerre E. Birdsong                       45              Treasurer                                      7/1/93

AmerenCIPS (Subsidiary)
- -----------------------

Gary L. Rainwater                       53              President,
                                                        Chief Executive Officer                        1/1/98
                                                        and Director                                 12/31/97
Thomas R. Voss                          52              Senior Vice President                          6/1/99
Warner L. Baxter                        38              Vice President,                               4/22/99
                                                        Controller and                               12/31/97
                                                        Director                                      4/22/99
Michael J. Montana                      53              Vice President                                4/28/98
Gilbert W. Moorman                      56              Vice President                                 6/1/88
Craig D. Nelson                         46              Vice President                                4/28/98
Jerry L. Simpson                        43              Vice President                                 6/1/99
Steven R. Sullivan                      39              Vice President, General Counsel
                                                        and Secretary                                 11/7/98
Jerre E. Birdsong                       45              Treasurer                                    12/31/97
</TABLE>



                                        9
<PAGE>   12


INFORMATION REGARDING EXECUTIVE OFFICERS REQUIRED BY ITEM 401(B) OF REGULATION
S-K:

<TABLE>
<CAPTION>

                                                                                             DATE FIRST ELECTED
                                     AGE AT                                                    OR APPOINTED TO
         NAME                       12/31/99            PRESENT POSITION                       PRESENT POSITION
         ----                       --------            ----------------                       ----------------
<S>                                 <C>                 <C>                                  <C>
Ameren Services Company (Subsidiary)
- ------------------------------------

Charles W. Mueller                      61              President, Chief Executive
                                                        Officer and Director                          11/4/97
Paul A. Agathen                         52              Senior Vice President                        12/31/97
                                                        and Director                                  4/27/99
Donald E. Brandt                        45              Senior Vice President                        12/31/97
                                                        and Director                                  11/4/97
Daniel F. Cole                          46              Senior Vice President                          6/1/99
Thomas F. Voss                          52              Senior Vice President                          6/1/99
Warner L. Baxter                        38              Vice President                                4/28/98
                                                        and Controller                               12/31/97
Charles A. Bremer                       55              Vice President                               12/31/97
Donald W. Capone                        64              Vice President                               12/31/97
William J. Carr                         62              Vice President                                 7/7/99
J. L. Davis                             52              Vice President                               12/31/97
Jean M. Hannis                          52              Vice President                               12/31/97
R. Alan Kelley                          47              Vice President                               12/31/97
Michael J. Montana                      53              Vice President                               12/31/97
Craig D. Nelson                         46              Vice President                               12/31/97
Gregory L. Nelson                       42              Vice President                                2/16/99
J. Kay Smith                            54              Vice President                                 7/1/99
Steven R. Sullivan                      39              Vice President, General Counsel                7/1/98
                                                        and Secretary                                  9/1/98
Samuel E. Willis                        55              Vice President                               12/31/97
Ronald C. Zdellar                       55              Vice President                               12/31/97
Jerre E. Birdsong                       45              Treasurer                                    12/31/97
</TABLE>


               All officers are elected or appointed annually by the respective
Board of Directors of such company following the election of such Board at the
annual meetings of stockholders held in April. There are no family relationships
between the foregoing officers of the Company. Except for Messrs. Baxter,
Gregory L. Nelson and Sullivan, 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
PricewaterhouseCoopers LLP. Mr. Nelson was previously employed by the law firm
of Thelen Reid & Priest LLP. Mr. Sullivan was previously employed by Anheuser
Busch Companies, Inc.

                                     PART II

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

               On October 9, 1998, the Company adopted a Shareholder Rights Plan
and declared a dividend of one preferred share purchase right (a Right) for each
outstanding share of common stock, par value $ .01 per share, of the Company.
Each Right entitles the registered holder to purchase from the Company one
one-hundredth of a share of Series A Junior Participating Preferred Stock, par
value $ .01 per share, of the Company at a price of $180 per one one-hundredth
of a share of such Preferred Stock, subject to adjustment. The Rights will
become exercisable if someone buys 15 percent or more of the




                                       10

<PAGE>   13


Company's common stock. In addition, if someone buys 15 percent or more of the
Company's common stock, each right will entitle its holder (other than that
buyer) to purchase a number of shares of the Company's common stock having a
market value of twice the Right's $180 exercise price. If the Company is
acquired in a merger, each Right will entitle its holder to purchase a number of
the acquiring company's common shares having a market value at the time of twice
the Right's exercise price.

              The Rights will expire on October 9, 2008. The Rights do not have
voting or dividend rights, and until they become exercisable, have no dilutive
effect on the per-share earnings of the Company. The Company has 4 million
shares of Preferred Stock initially reserved for issuance upon exercise of the
Rights. There is no Junior Participating Preferred Stock issued or outstanding.

              For additional information on the Shareholder Rights Plan, see
Note 6 to the "Notes to Consolidated Financial Statements" on Page 33 of the
1999 Annual Report pages incorporated herein by reference.

              Additional information required to be reported by this item is
included on the inside back cover of the 1999 Annual Report and is incorporated
herein by reference.


ITEM 6.       SELECTED FINANCIAL DATA.

              Information for the 1994-1999 period required to be reported by
this item is included on Page 43 of the 1999 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 15 through 22 of the 1999 Annual Report and is incorporated herein by
reference.


ITEM 7A.      QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

              Information required to be reported by this item is included under
"Market Risk Related to Financial Instruments and Commodity Instruments" in
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" on Page 21 of the 1999 Annual Report and is incorporated herein by
reference.


ITEM 8.       FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA.

              The financial statements of the Company on Pages 23 through 42,
the report thereon of PricewaterhouseCoopers LLP appearing on Page 14 and the
Selected Quarterly Information on Page 27 of the 1999 Annual Report are
incorporated herein by reference.


                                    PART III

ITEM 10.      DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT.

              Information concerning directors required to be reported by this
item is included under "Item (1): Election of Directors" in the Company's 2000
definitive proxy statement filed pursuant to Regulation 14A and is incorporated
herein by reference.





                                       11

<PAGE>   14

              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 2000 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 2000 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 2000 definitive proxy
statement filed pursuant to Regulation 14A and is incorporated herein by
reference.


                                     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 1999
                                                                                                  Annual Report
                                                                                                  -------------

              <S>                                                                                <C>
              Consolidated Report of Independent Accountants..................................          14
              Consolidated Statement of Income - Years 1999, 1998, and 1997...................          23
              Consolidated Balance Sheet - December 31, 1999 and 1998.........................          24
              Consolidated Statement of Cash Flows - Years 1999, 1998, and 1997...............          26
              Consolidated Statement of Retained Earnings
                 - Years 1999, 1998, and 1997.................................................          27
              Notes to Consolidated Financial Statements......................................          28
</TABLE>


              *  Incorporated by reference from the indicated pages of the
                 1999 Annual Report

                                       12

<PAGE>   15


          2.  Financial Statement Schedule:

              The following schedule, for the years ended December 31, 1999,
              1998 and 1997, 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...........................................................          14

              Valuation and Qualifying Accounts (Schedule II).................................          15
</TABLE>

          3.  Exhibits:  See EXHIBITS beginning on Page 17

          (b) Reports on Form 8-K. The Company filed a report on Form 8-K dated
              December 20, 1999 reporting AmerenCIPS' termination of coal supply
              contracts, the resulting estimated pretax fuel cost savings and
              the recording of a nonrecurring charge. Further, a report dated
              January 20, 2000 was filed reporting the issuance of a Report and
              Order dated December 23, 1999 by the Missouri Public Service
              Commission regarding AmerenUE's electric alternative regulation
              plans.






                                       13
<PAGE>   16







                        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
2, 2000 appearing in the 1999 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/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP
St. Louis, Missouri
February 2, 2000





                                       14
<PAGE>   17




                               AMEREN CORPORATION
                 SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
              FOR THE YEARS ENDED DECEMBER 31, 1999, 1998 AND 1997

<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
     -----------                              ---------         --------          --------------       ----------         ------
                                                                                                         (Note)
<S>                                            <C>               <C>               <C>                 <C>              <C>
Year ended December 31, 1999

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

    Allowance for doubtful accounts           $8,392,655        $12,240,000                            $13,496,315       $7,136,340
                                              ==========        ===========                            ===========       ==========




Year ended December 31, 1998

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

    Allowance for doubtful accounts           $4,845,328        $21,167,000                             $17,619,673       $8,392,655
                                              ==========        ===========                             ===========       ==========




Year ended December 31, 1997

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
                                             ==========        ===========                              ===========       ==========
</TABLE>

Note:  Uncollectible accounts charged off, less recoveries.




                                       15

<PAGE>   18




                                   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 29, 2000            By /s/ Steven R. Sullivan
      ---------------              --------------------------
                                   (Steven R. Sullivan, 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>
<S><C>
                  SIGNATURE                                                         TITLE
                  ---------                                                         -----

/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 Officer)
DONALD E. BRANDT

/s/ Warner L. Baxter                                                             Vice President and Controller
- --------------------------------------------------                              (Principal Accounting Officer)
WARNER L. BAXTER

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

/s/ Clifford L. Greenwalt
- --------------------------------------------------            ------------------------------------------------
CLIFFORD L. GREENWALT, Director                               HANNE M. MERRIMAN, Director

/s/ Thomas A. Hays                                            /s/ Paul L. Miller, Jr.
- --------------------------------------------------            ------------------------------------------------
THOMAS A. HAYS, Director                                      PAUL L. MILLER, JR., Director

/s/ Richard A. Liddy                                          /s/ Robert H. Quenon
- --------------------------------------------------            ------------------------------------------------
RICHARD A. LIDDY, Director                                    ROBERT H. QUENON, Director

/s/ Gordon R. Lohman                                          /s/ Harvey Saligman
- --------------------------------------------------            ------------------------------------------------
GORDON R. LOHMAN, Director                                    HARVEY SALIGMAN, Director

/s/ Richard A. Lumpkin                                        /s/ Janet McAfee Weakley
- --------------------------------------------------            ------------------------------------------------
RICHARD A. LUMPKIN, Director                                  JANET McAFEE WEAKLEY, Director

/s/ John Peters MacCarthy
- --------------------------------------------------            ------------------------------------------------
JOHN PETERS MacCARTHY, Director                               JAMES W. WOGSLAND, Director


                               By /s/ Steven R. Sullivan                        March 29, 2000
                                  -------------------------------------------
                                  (Steven R. Sullivan, Attorney-in Fact)
</TABLE>



                                       16


<PAGE>   19



                                    EXHIBITS

                             EXHIBITS FILED HEREWITH
                             -----------------------

EXHIBIT NO.                    DESCRIPTION
- -----------                    -----------

   13     - Those pages of the 1999 Annual Report incorporated herein by
            reference.

   21     - Subsidiaries of the Company.

   23     - Consent of Independent Accountants.

   24     - Powers of Attorney.

   27     - Financial Data Schedule.



                       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.

EXHIBIT NO.                       DESCRIPTION
- -----------                       -----------

   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.)

   3(ii)  - Certificate of Amendment to the Restated Articles of Incorporation
            filed with the Secretary of State of the State of Missouri on
            December 14, 1998. (1998 Form 10-K, Exhibit 3(i).)

   3(iii) - By-Laws of the Company as amended to December 31, 1997. (1997 Form
            10-K, Exhibit 3(ii).)

   4.1    - Indenture of Mortgage and Deed of Trust of Union Electric Company
            dated June 15, 1937, as amended May 1, 1941, and Second Supplemental
            Indenture dated May 1, 1941. (Registration No. 2-4940, Exhibit B-1.)






                                       17

<PAGE>   20


<TABLE>
<CAPTION>
<S><C>

EXHIBIT NO.               DESCRIPTION
- -----------               -----------

     4.2          - Supplemental Indentures to the Union Electric Company Mortgage

                    DATED AS OF                FILE REFERENCE                           EXHIBIT NO.
                    -----------                --------------                           -----------
                    March 1, 1967              2-58274                                      2.9
                    April 1, 1971              Form 8-K, April 1971                         6
                    February 1, 1974           Form 8-K, February 1974                      3
                    July 7, 1980               2-69821                                      4.6
                    May 1, 1990                Form 10-K, 1990                              4.6
                    December 1, 1991           33-45008                                     4.4
                    December 4, 1991           33-45008                                     4.5
                    January 1, 1992            Form 10-K, 1991                              4.6
                    October 1, 1992            Form 10-K, 1992                              4.6
                    December 1, 1992           Form 10-K, 1992                              4.7
                    February 1, 1993           Form 10-K, 1992                              4.8
                    May 1, 1993                Form 10-K, 1993                              4.6
                    August 1, 1993             Form 10-K, 1993                              4.7
                    October 1, 1993            Form 10-K, 1993                              4.8
                    January 1, 1994            Form 10-K, 1993                              4.9
                    December 1, 1996           Form 10-K, 1996                              4.36

     4.3          - Indenture of Mortgage or Deed of Trust dated October 1,
                    1941, from CIPS to Continental Illinois National Bank and
                    Trust Company of Chicago and Edmond B. Stofft, as Trustees.
                    (Exhibit 2.01 in File No. 2-60232.)

     4.4          - Supplemental Indentures dated, respectively September 1,
                    1947, January 1, 1949, February 1, 1952, September 1, 1952,
                    June 1, 1954, February 1, 1958, January 1, 1959, May 1,
                    1963, May 1, 1964, June 1, 1965, May 1, 1967, April 1, 1970,
                    April 1, 1971, September 1, 1971, May 1, 1972, December 1,
                    1973, March 1, 1974, April 1, 1975, October 1, 1976,
                    November 1, 1976, October 1, 1978, August 1, 1979, February
                    1, 1980, February 1, 1986, May 15, 1992, July 1, 1992,
                    September 15, 1992, April 1, 1993, and June 1, 1995 between
                    CIPS and the Trustees under the Indenture of Mortgage or
                    Deed of Trust referred to above (Amended Exhibit 7(b) in
                    File No. 2-7341; Second Amended Exhibit 7.03 in File No.
                    2-7795; Second Amended Exhibit 4.07 in File No. 2-9353;
                    Amended Exhibit 4.05 in file No. 2-9802; Amended Exhibit
                    4.02 in File No. 2-10944; Amended Exhibit 2.02 in File No.
                    2-13866; Amended Exhibit 2.02 in File No. 2-14656; Amended
                    Exhibit 2.02 in File No.2-21345; Amended Exhibit 2.02 in
                    File No. 2-22326; Amended Exhibit 2.02 in File No. 2-23569;
                    Amended Exhibit 2.02 in File No. 2-26284; Amended Exhibit
                    2.02 in File No. 2-36388; Amended Exhibit 2.02 in File No.
                    2-39587; Amended Exhibit 2.02 in File No. 2-41468; Amended
                    Exhibit 2.02 in File No. 2-43912; Exhibit 2.03 in File No.
                    2-60232; Amended Exhibit 2.02 in File No. 2-50146; Amended
                    Exhibit 2.02 in File No. 2-52886; Second Amended Exhibit
                    2.04 in File No. 2-57141; Amended Exhibit 2.04 in File No.
                    2-57557; Amended Exhibit 2.06 in File No. 2-62564; Exhibit
                    2.02(a) in File No. 2-65914; Amended Exhibit 2.02(a) in File
                    No. 2-66380; and Amended Exhibit 4.02 in File No. 33-3188;
                    Exhibit 4.02 to Form 8-K dated May 15, 1992; Exhibit 4.02 to
                    Form 8-K dated July 1, 1992; Exhibit 4.02 to Form 8-K dated
                    September 15, 1992; Exhibit 4.02 to Form 8-K dated March 30,
                    1993; Exhibit 4.03 to Form 8-K dated June 5, 1995; Exhibit
                    4.03 to Form 8-K dated March 15, 1997; Exhibit 4.03 to Form
                    8-K dated June 1, 1997; and Exhibit 4.02, Post-Effective
                    Amendment No. 1 in File No. 333-18473.)
</TABLE>



                                       18


<PAGE>   21


<TABLE>
<CAPTION>


EXHIBIT NO.                                    DESCRIPTION
- -----------                                    -----------
<S>             <C>
   4.5          -  Agreement, dated as of October 9, 1998, between the Company and First Chicago Trust
                   Company of New York, as Rights Agent, which includes the form of Certificate of Designation
                   of the Preferred Shares as Exhibit A, the form of Right Certificate as Exhibit B and the Summary
                   of Rights as Exhibit C. (October 14, 1998 Form 8-K, Exhibit 4.)

   4.6          -  Indenture dated as of December 1, 1998 from CIPS to the Bank of New York relating to CIPS'
                   Senior Notes, 5.375% due 2008 and 6.125% due 2028.  (Exhibit 4.03, Post-Effective Amendment No. 1
                   to File No. 333-18473.)

  10.1          -  Long-Term Incentive Plan of 1998.  (1998 Form 10-K, Exhibit 10.1.)

  10.2          -  Change of Control Severance Plan.  (1998 Form 10-K, Exhibit 10.2.)

  10.3          -  Deferred Compensation Plan for Members of the Ameren Leadership Team.  (1998 Form 10-K, Exhibit
                   10.3.)

  10.4          -  Deferred Compensation Plan for Members of the Board of Directors. (1998 Form 10-K, Exhibit 10.4.)
</TABLE>

Note: Reports of Union Electric Company on Forms 8-K, 10-Q and 10-K are on file
      with the SEC under File Number 1-2967.

      Reports of Central Illinois Public Service Company on Forms 8-K, 10-Q and
      Form 10-K are on file with the SEC under File Number 1-3672.




                                       19

<PAGE>   1
                                                                      EXHIBIT 13


page 14  Ameren Corporation  1999 Annual Report

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.


Charles W. Mueller                                Donald E. Brandt
Charles W. Mueller                                Donald E. Brandt
Chairman, President and Chief Executive Officer   Senior Vice President, Finance
February 2, 2000                                  February 2, 2000

REPORT OF INDEPENDENT ACCOUNTANTS

TO THE STOCKHOLDERS AND BOARD OF DIRECTORS OF AMEREN CORPORATION:
   In our opinion, based upon our audits and the report of other auditors,
the accompanying consolidated balance sheet and the related consolidated
statements of income and retained earnings and of cash flows appearing on pages
23-27 of this annual report present fairly, in all material respects, the
financial position of Ameren Corporation and its subsidiaries at December 31,
1999 and 1998, and the results of their operations and their cash flows for each
of the three years in the period ended December 31, 1999, in conformity with
generally accepted accounting principles in the United States. 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 of
Ameren Corporation, for the year ended December 31, 1997, which combined
statements reflect total revenues of $863,441,000 for the year ended December
31, 1997. Those statements were audited by other auditors whose report thereon
has 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 for the year ended December 31, 1997, is based solely
on the report of the other auditors. We conducted our audits of these statements
in accordance with generally accepted auditing standards in the United States,
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 report of
other auditors provide a reasonable basis for the opinion expressed above.


PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP
St. Louis, Missouri
February 2, 2000

<PAGE>   2
                                                       www.ameren.com    page 15

MANAGEMENT'S DISCUSSION AND ANALYSIS OF
FINANCIAL CONDITION AND RESULTS OF OPERATIONS


OVERVIEW
   Ameren Corporation (Ameren) is a holding company 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 subsidiaries of
Ameren (the Merger). As a result of the Merger, Ameren has a 60% ownership
interest in Electric Energy, Inc. (EEI). That interest is consolidated for
financial reporting purposes. Since the Merger, Ameren has formed AmerenEnergy,
Inc. (AmerenEnergy), Ameren Development Company, Ameren Intermediate Holding
Company, Inc., and Ameren Services Company. AmerenEnergy, an energy marketing
subsidiary, primarily serves as a power marketing agent for the operating
utility subsidiaries and provides a range of energy and risk management services
to targeted customers. Ameren Development Company is a nonregulated subsidiary
encompassing Ameren's nonregulated products and services. Ameren Intermediate
Holding Company, Inc. is a holding company for the proposed Illinois
nonregulated generating subsidiary and its proposed marketing affiliate (see
discussion below under "Electric Industry Restructuring - Illinois" and Note 2-
Regulatory Matters under Notes to Consolidated Financial Statements for further
information). Ameren Services Company provides shared support services to Ameren
and all of its subsidiaries.
   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 OPERATIONS
EARNINGS
   Earnings for 1999, 1998 and 1997, were $385 million ($2.81 per share), $386
million ($2.82 per share) and $335 million ($2.44 per share), respectively.
Earnings and earnings per share fluctuated due to many conditions, primarily:
sales growth, weather variations, credits to electric customers, electric rate
reductions, gas rate increases, competitive market forces,  fluctuating
operating costs (including Callaway Nuclear Plant refueling outages), charges
for coal contract terminations and a targeted employee separation plan,
merger-related expenses, changes in interest expense, changes in income and
property taxes, and an extraordinary charge.
   In the fourth quarter of 1999, the Company recorded a nonrecurring charge to
earnings in connection with coal contract terminations with two coal suppliers.
The charge reduced earnings $31 million, net of income taxes, or 23 cents per
share (see discussion below under "Electric Operations" and Note 12 -
Commitments and Contingencies under Notes to Consolidated Financial Statements
for further information). In 1998, the Company also recorded a nonrecurring
charge to earnings in connection with a targeted separation plan it offered to
employees in July 1998. That charge reduced earnings $15 million, net of income
taxes, or 11 cents per share (see Note 3 - Targeted Separation Plan under Notes
to Consolidated Financial Statements for further information). In addition, 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).
   The significant items affecting revenues, expenses and earnings for the
years ended December 31, 1999, 1998 and 1997 are detailed in the following
pages.

ELECTRIC OPERATIONS
ELECTRIC REVENUES

<TABLE>
<CAPTION>
                               Variations from Prior Year
In Millions                    1999       1998       1997
- -----------------------------------------------------------
<S>                           <C>         <C>        <C>
Rate variations               $ (17)      $(13)      $  -
Credit to customers               5        (24)        28
Effect of abnormal weather      (53)        61          3
Growth and other                 57         45          5
Interchange sales               177         16        (43)
EEI sales                        24        (55)         9
                              ---------------------------
                              $ 193       $ 30       $  2
                              ---------------------------
</TABLE>

   Electric revenues for 1999 increased $193 million, compared to 1998,
primarily due to a 9% increase in total kilowatthour sales. This increase was
primarily driven by a 60% increase in interchange sales, due to strong marketing
efforts by AmerenEnergy, and a 12% increase in EEI sales. Also contributing to
the revenue increase was a decrease in the credit to Missouri electric
customers, partially offset by the credit to Illinois electric customers (see
Note 2 - Regulatory Matters under Notes to Consolidated Financial Statements for
further information). Partially offsetting these increases, weather-sensitive
residential and commercial sales decreased 2% and 1%, respectively, while
industrial sales remained flat. In addition, revenues were lower due to rate
decreases in both Missouri and Illinois (see Note 2 - Regulatory Matters under
Notes to Consolidated Financial Statements for further information).
   Electric revenues for 1998 increased $30 million, compared to 1997. Revenues
increased primarily due to higher sales to retail customers within the Company's
service territory, as a result of warm summer weather and economic growth in the
service area. Weather-sensitive residential and commercial sales increased 6%
and 4%, respectively, while industrial sales grew 2%. Additionally, interchange
revenues increased 7%, despite a 14%

<PAGE>   3

page 16  Ameren Corporation  1999 Annual Report

decline in interchange sales, due to market conditions. These increases were
partially offset by an increase in credits to Missouri electric customers (see
Note 2 - Regulatory Matters under Notes to Consolidated Financial Statements for
further information) and lower sales by EEI.
   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; a 1% decline in residential sales;
and differences in the classification of certain interchange and purchased power
transactions, resulting from the Federal Energy Regulatory Commission (FERC)
Order 888. 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.

FUEL AND PURCHASED POWER

<TABLE>
<CAPTION>
                                        Variations from Prior Year
In Millions                              1999     1998       1997
- ------------------------------------------------------------------
<S>                                      <C>      <C>        <C>
Fuel:
  Generation                             $ 10     $  9       $ 25
  Price                                   (15)     (23)       (24)
  Generation efficiencies and other        (8)       -         (5)
  Coal contract termination payments       52        -          -
Purchased power                           117       (3)       (50)
EEI                                        37      (39)        10
                                         ------------------------
                                         $193     $(56)      $(44)
                                         ------------------------
</TABLE>

   The $193 million increase in fuel and purchased power costs for 1999,
compared to 1998, was primarily due to increased generation and purchased power,
resulting from higher sales volume, increased fuel and purchased power costs at
EEI and coal contract termination payments discussed below, partially offset by
lower fuel costs.
   In the fourth quarter of 1999, AmerenCIPS and two of its coal suppliers
executed agreements to terminate their existing coal supply contracts effective
December 31, 1999. Under these agreements, AmerenCIPS made termination payments
to the suppliers totaling approximately $52 million. These termination payments
were recorded as a nonrecurring charge in the fourth quarter of 1999. Total
pretax fuel cost savings from these termination agreements are estimated to be
$183 million (or $131 million net of the termination payments) through 2010,
which is the maximum period that would have remained on any of the terminated
coal supply contracts. Approximately $66 million of pretax fuel cost savings is
expected to be realized over the next three years. See Note 12 - Commitments and
Contingencies under Notes to Consolidated Financial Statements for further
information.
   The $56 million decrease in fuel and purchased power costs for 1998, compared
to 1997, was primarily driven by lower fuel and purchased power costs at EEI as
a result of fewer sales. In addition, fuel cost reductions were realized due to
lower fuel prices, as well as through the joint dispatch of generation. Upon
consummation of the Merger, AmerenUE and AmerenCIPS began jointly dispatching
generation, therefore allowing the Company to utilize the most cost efficient
plants of both operating companies to serve customers in either service
territory. These decreases were partially offset by increased generation to
serve native load demand. The decrease in 1997 fuel and purchased power costs
was primarily due to reduced purchased power costs, resulting from relatively
flat native load sales and lower interchange sales, as well as lower fuel
prices, offset by greater generation.

GAS OPERATIONS
   Gas revenues in 1999 increased $12 million, compared to 1998, primarily
due to Illinois gas rate increases which became effective in February 1999 (see
Note 2 - Regulatory Matters under Notes to Consolidated Financial Statements for
further information) and higher gas costs recovered through the Company's
purchased gas adjustment clauses. These increases were partially offset by an 8%
decline in retail sales, resulting primarily from milder weather, as well as a
decrease in off-system sales of gas to others. Gas revenues in 1998 decreased
$33 million, compared to 1997, primarily due to an 8% decline in retail sales
resulting from milder winter weather and lower gas costs reflected in the
Company's purchased gas adjustment clauses. These decreases were partially
offset by benefits realized from a Missouri gas rate increase effective February
1998 (see Note 2-Regulatory Matters under Notes to Consolidated Financial
Statements for further information). Gas revenues in 1997 decreased $4 million,
primarily due to a 12% decrease in retail sales. Milder winter weather resulted
in a decline in weather-sensitive residential and commercial sales of 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.
   Gas costs in 1999 increased $13 million compared to 1998. This increase in
gas costs was primarily due to higher gas prices, partially offset by lower
total sales. Gas costs in 1998 declined $42 million, compared to 1997, due to
lower sales and lower gas prices. Gas costs for 1997 remained flat, as compared
to those of 1996.

OTHER OPERATING EXPENSES
   Other operating expense variations in 1997 through 1999 reflected
recurring factors such as growth, inflation, labor and benefit increases, in
addition to the capitalization of certain costs as a result of a Missouri Public
Service Commission (MoPSC) Order and a charge for the targeted employee
separation plan (TSP), as discussed below.
   In 1998, the Company announced plans to reduce its other operating
expenses, including plans to eliminate approximately 400 employee positions by
mid-1999 through a hiring freeze and the TSP. During the third quarter of 1998,
a nonrecurring, pretax charge of $25 million was recorded, representing costs
incurred to implement the TSP. The elimination of these positions, exclusive of
the nonrecurring charge, reduced the Company's operating expenses approximately
$15 million in 1998, and approximately $22 million in 1999, and is expected to
reduce the Company's operating expenses by approximately $20 million to $25
million

<PAGE>   4
                                                       www.ameren.com    page 17

each year thereafter. See Note 3 - Targeted Separation Plan under Notes to
Consolidated Financial Statements for further information.
   Other operating expenses decreased $18 million in 1999, compared to
1998. This decrease was primarily due to the 1998 charge for the TSP and related
reduced workforce and the capitalization of certain costs (including computer
software costs) that had previously been expensed for the Company's Missouri
electric operations. The capitalization was a result of the MoPSC Order received
in December 1999 (see Note 2 - Regulatory Matters under Notes to Consolidated
Financial Statements for further information). These decreases were partially
offset by current year expenses associated with electric industry deregulation
in Illinois. The $62 million increase in other operations expense in 1998,
compared to 1997, was primarily due to the charge for the TSP and increases in
injuries and damages expense and information system-related costs. In 1997,
other operations expenses increased $41 million, primarily due to increases in
information system-related costs, labor, and injuries and damages expenses.
   Maintenance expenses increased $59 million in 1999, compared to 1998.
This increase was primarily due to increased power plant maintenance and
tree-trimming activity. The expenses incurred for the 35-day refueling outage in
the fall of 1999 at the Callaway Nuclear Plant were comparable to those for the
31-day spring 1998 refueling outage. No refueling outage is scheduled for 2000.
Maintenance expenses increased $2 million in 1998, compared to 1997, due to the
refueling outage at the Callaway Nuclear Plant, partially offset by less
scheduled fossil power plant maintenance. Maintenance expenses for 1997
increased $8 million, primarily resulting from increased scheduled fossil plant
maintenance, partly offset by decreased expenses at the Callaway Plant due to
the absence of a refueling outage in 1997.
   Depreciation and amortization expense was relatively flat in 1999 and 1998,
compared to the prior year periods. Depreciation and amortization expense
increased $7 million in 1997, due to increased depreciable property.

TAXES
   Income tax expense from operations decreased $9 million in 1999,
compared to 1998, due to lower pretax income. Income tax expense from operations
increased $33 million in 1998, compared to 1997, due to higher pretax income and
a higher effective tax rate. Income tax expense from operations decreased $19
million in 1997, principally due to lower pretax income and a lower effective
tax rate.
   Other tax expense decreased $26 million in 1999, compared to 1998, primarily
due to a decrease in gross receipts taxes related to the Company's Illinois
jurisdiction. This decrease is the result of the restructuring of the Illinois
public utility tax whereby gross receipts taxes are no longer recorded as
electric revenues and gross receipts tax expense.

OTHER INCOME AND DEDUCTIONS
   Miscellaneous, net increased $8 million, compared to 1998, primarily due to
the write-off of certain nonregulated investments in 1999 and gains on the sale
of property realized in 1998 but not in 1999. Miscellaneous, net decreased $8
million for 1998, compared to 1997, due to increased interest income and gains
on the sale of property. Miscellaneous, net decreased $11 million for 1997,
compared to 1996, primarily due to the capitalization of certain merger-related
costs in 1997 (see Note 2 - Regulatory Matters under Notes to Consolidated
Financial Statements for further information).

INTEREST
   Interest expense decreased $13 million in 1999, primarily due to a lower
amount of debt outstanding throughout the year. Interest expense decreased $4
million in 1998, compared to 1997, due to lower interest rates and a decrease in
other interest expense, partially offset by an increase in interest on a higher
amount of debt outstanding. Interest expense increased $5 million in 1997,
primarily due to higher debt outstanding during the year at higher interest
rates.

BALANCE SHEET
   The $22 million increase in trade accounts receivable and unbilled
revenue was due primarily to higher sales and revenues in November and December
1999, compared to the same 1998 period. The $20 million decrease in accounts
receivable and unbilled revenues at December 31, 1998, compared to 1997, was due
to lower sales and revenues in November and December 1998, compared to the same
1997 time period, due to mild winter weather.
   The $84 million increase in other current liabilities was primarily due to
the timing of credit payments to electric customers in the Company's Missouri
and Illinois jurisdictions, as well as an increase in a liability for an
estimated rate reduction for Missouri electric customers retroactive to
September 1, 1998 (see Note 2-Regulatory Matters under Notes to Consolidated
Financial Statements for further information). The remaining variance is a
result of the timing of various payments to suppliers.

LIQUIDITY AND CAPITAL RESOURCES
   Cash provided by operating activities totaled $918 million for 1999,
compared to $803 million for 1998 and $708 million for 1997.
   Cash flows used in investing activities totaled $558 million, $323
million and $387 million, for the years ended December 31, 1999, 1998 and 1997,
respectively. Expenditures in 1999 for constructing new or improving existing
facilities and purchasing rail cars were $571 million. In addition, the Company
spent $22 million to acquire nuclear fuel.
   Capital expenditures are expected to approximate $749 million in 2000.
For the five-year period 2000 through 2004, construction expenditures are
estimated at $3.3 billion. This estimate includes capital expenditures of
approximately $1 billion for the purchase of new combustion turbines (CTs) (see
Note 12-Commitments and Contingencies under Notes to Consolidated Financial
Statements for further information), as well as expenditures that will be
incurred by the Company to meet new air quality standards for ozone and
particulate matter, as discussed below.
   Title IV of the Clean Air Act Amendments of 1990 requires the Company
to significantly reduce total annual sulfur dioxide (SO2) and nitrogen oxide
(NOx) emissions by the year 2000. By switching to low-sulfur coal, early banking
of emission credits and installing advanced NOx reduction combustion technology,
the Company is meeting these requirements.

<PAGE>   5
page 18  Ameren Corporation  1999 Annual Report

   In July 1997, the United States Environmental Protection Agency (EPA)
issued regulations revising the National Ambient Air Quality Standards for ozone
and particulate matter. In May 1999, the U.S. Court of Appeals for the District
of Columbia remanded the regulations back to the EPA for review. Litigation
regarding appeals of these regulations is ongoing. New ambient standards may
result in significant additional reductions in SO2 and NOx emissions from the
Company's power plants by 2007. At this time, the Company is unable to predict
the ultimate impact of these revised air quality standards on its future
financial condition, results of operations or liquidity.
   In an attempt to lower ozone levels across the eastern United States,
the EPA issued the implementation of regulations in September 1998 to reduce NOx
emissions from coal-fired boilers and other sources in 22 states, including
Missouri and Illinois (where all of the Company's coal-fired power plant boilers
are located). The implementation of these regulations has been delayed by the
U.S. Court of Appeals for the District of Columbia until a legal challenge
brought by various industries and states has been resolved. The proposed
regulations mandate a 75% reduction from 1990 levels by the year 2003 and
require states to develop plans to reduce NOx emissions to help alleviate ozone
problem areas. The NOx emissions reductions already achieved on several of the
Company's coal-fired power plants will help to reduce the costs of compliance
with these regulations. However, preliminary analysis of the regulations
indicate that selective catalytic reduction technology may be required for some
of the Company's units, as well as other additional controls.
   Currently, the Company estimates that its additional capital
expenditures to comply with the final NOx regulations could range from $250
million to $300 million over the period from 1999 to 2003. Associated operations
and maintenance expenditures could increase $10 million to $15 million annually,
beginning in 2003. The Company is exploring alternatives to comply with these
new regulations in order to minimize, to the extent possible, its capital costs
and operating expenses. The Company is unable to predict the ultimate impact of
these standards on its future financial condition, results of operations or
liquidity.
   In November 1998, the United States signed an agreement with numerous
other countries (the Kyoto Protocol) containing certain environmental
provisions, which would require decreases in greenhouse gases in an effort to
address the "global warming" issue. The Kyoto Protocol has not been ratified by
the United States Senate. Implementation of the Kyoto Protocol in its present
form would likely result in significantly higher capital costs and operations
and maintenance expenses by the Company. At this time, the Company is unable to
determine the impact of these proposals on the Company's future financial
condition, results of operations or liquidity.
   See Note 13 - Callaway Nuclear Plant under Notes to Consolidated
Financial Statements for a discussion of Callaway Plant decommissioning costs.
   Cash flows used in financing activities were $241 million for 1999,
compared to $446 million for 1998 and $302 million for 1997. The Company's
principal financing activities during 1999 included the issuance of $210 million
of long-term debt, the redemption of $174 million of long-term debt and the
payment of dividends.
   The Company plans to continue utilizing short-term debt to support
normal operations and other temporary requirements. The Company and its
subsidiaries are authorized by the Securities and Exchange Commission (SEC)
under PUHCA to have up to an aggregate $2.8 billion 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, 1999, the Company
had committed bank lines of credit aggregating $180 million, all of which was
unused and 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. The Company has bank credit agreements, expiring at various
dates between 2000 and 2003, that support commercial paper programs totaling
$800 million, $500 million of which is available for the Company's own use and
for the use of its subsidiaries. The remaining $300 million is available for the
use of the Company's regulated subsidiaries. At December 31, 1999, $520 million
was unused and available. The Company had $80 million of short-term borrowings
outstanding at year-end.
   AmerenUE also has a lease agreement that provides for the financing of
nuclear fuel. At December 31, 1999, the maximum amount that could be financed
under the agreement was $120 million. Cash used in financing for 1999 included
issuances under the lease for nuclear fuel of $65 million, offset in part by $15
million of redemptions. At December 31, 1999, $116 million was financed under
the lease. See Note 5 - Nuclear Fuel Lease under Notes to Consolidated Financial
Statements for further information.
   The Company, in the ordinary course of business, explores opportunities
to reduce its costs in order to remain competitive in the marketplace. Areas
where the Company focuses its review include, but are not limited to, labor
costs and fuel supply costs. In the labor area, the Company has recently reached
agreements with many of the Company's major collective bargaining units which
will permit it to manage its labor costs and practices effectively in the
future. The Company also explores alternatives to effectively manage the size of
its workforce. These alternatives include utilizing hiring freezes, outsourcing
and offering employee separation packages. In the fuel supply area, the Company
explores alternatives to effectively manage its overall fuel costs. These
alternatives include diversifying fuel sources for use at the Company's fossil
power plants (e.g. utilizing low-sulfur versus high-sulfur coal), as well as
restructuring or terminating existing contracts with suppliers.
   Certain of these reduction alternatives could result in additional
investments being made at the Company's power plants in order to utilize
different types of coal, or could require nonrecurring payments of employee
separation benefits or nonrecurring payments to restructure or terminate
existing fuel contracts with a supplier. Management is unable to predict which
(if any), and to what extent, these alternatives to reduce its overall cost
structure will be executed. Management is unable to determine the impact of
these actions on the Company's future financial position, results of operations
or liquidity.
<PAGE>   6
                                                       www.ameren.com    page 19

DIVIDENDS
   Common stock dividends paid in 1999 resulted in a payout rate of 90% of the
Company's net income. Dividends paid to common stockholders in relation to net
cash provided by operating activities for the same period were 38%.
   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 11, 2000, the Ameren Board of Directors
declared a quarterly common stock dividend of 63.5 cents per share, payable
March 31, 2000.

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

ELECTRIC INDUSTRY RESTRUCTURING
   Steps taken and being considered at the federal and state levels continue to
change the structure of the electric industry and utility regulation, and
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 strandable 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 1998, Ameren's operating utility subsidiaries joined a group of companies
that support the formation of the Midwest Independent System Operator (Midwest
ISO). An ISO operates, but does not own, electric transmission systems and
maintains system reliability and security, while alleviating pricing issues
associated with the "pancaking" of rates. The Midwest ISO would be regulated by
the FERC. Thirteen transmission-owning utilities have joined the Midwest ISO as
of December 31, 1999. The FERC conditionally approved the formation of the
Midwest ISO in September 1998, and it is expected to be operational during the
year 2001. The MoPSC and the Illinois Commerce Commission (ICC) have authorized
AmerenUE and AmerenCIPS to join the Midwest ISO and to transfer control of their
transmission facilities to the Midwest ISO. The Midwest ISO covers 14 states,
represents portions of 60,000 miles of transmission line and controls $8 billion
of assets. The Company believes that the operation of the Midwest ISO will not
have a material adverse effect on its financial condition, results of operations
or liquidity.
   In December 1999, the FERC issued Order 2000 relating to Regional
Transmission Organizations (RTOs) that would meet certain characteristics such
as size and independence. Order 2000 calls on all transmission owners to join
RTOs. In particular, all public utilities that own, operate, or control
interstate transmission facilities must file with the FERC by October 15, 2000,
a proposal for an RTO, or alternatively a description of efforts by the utility
to join an RTO. The Company expects that its participation in the Midwest ISO
will satisfy the requirements of Order 2000.

ILLINOIS
   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 Illinois Law) providing for electric utility restructuring in Illinois.
This legislation introduces competition into the supply of electric energy at
retail in Illinois.
   Major provisions of the Illinois Law include the phasing-in through 2002 of
retail direct access, which allows customers to choose their electric generation
suppliers. The phase-in of retail direct access began on October 1, 1999, with
large commercial and industrial customers principally comprising the initial
group. The customers in this group represent approximately 10% of the Company's
total sales. As of December 31, 1999, the impact of retail direct access on the
Company's financial condition, results of operations or liquidity was
immaterial. Retail direct access will be offered to the remaining commercial and
industrial customers on December 31, 2000, and to residential customers on May
1, 2002.
   In addition, the Illinois Law included a 5% rate decrease for residential
customers that became effective in August 1998. This rate decrease reduced
electric revenues $8 million in 1999 compared to 1998 and is expected to impact
electric revenues by approximately $14 million annually, based on estimated
levels of sales and assuming normal weather conditions. (See Note 2 - Regulatory
Matters under Notes to Consolidated Financial Statements for further
information). In 1998, the Company eliminated its Uniform Fuel Adjustment
Clauses (FACs) as allowed by the Illinois Law, which benefited shareholders in
1998 and 1999 and is expected to benefit shareholders in the future (see Note 1
- - Summary of Significant Accounting Policies under Notes to Consolidated
Financial Statements for further information). The Illinois Law contains a
provision allowing for the potential recovery of a portion of strandable costs,
which
<PAGE>   7

page 20  Ameren Corporation  1999 Annual Report

represent costs that would not be recoverable in a restructured environment,
through a transition charge collected from customers who choose an alternate
electric supplier. In addition, the Illinois Law contains a provision requiring
a portion of excess earnings (as defined under the Illinois Law) for the years
1998 through 2004 to be refunded to customers. As of December 31, 1999, the
Company recorded an estimated $5 million credit it expects to return to its
Illinois customers under the Illinois Law for the two-year period ended
December 31, 1999. See Note 2 - Regulatory Matters under Notes to Consolidated
Financial Statements for further information.
   In December 1997, after evaluating the impact of the Illinois Law, 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 for financial reporting purposes and
that no plant writedowns are necessary at this time. See Note 2 - Regulatory
Matters under Notes to Consolidated Financial Statements for further
information.
   In conjunction with another provision of the Illinois Law, in July 1999,
AmerenCIPS filed a notice with the ICC that it intends to transfer AmerenCIPS'
generating facilities (all in Illinois) to a new nonregulated subsidiary of
Ameren. The formation of the new generating subsidiary, as well as the transfer
of AmerenCIPS' generating assets and liabilities (at historical net book value)
and certain power sales contracts, is subject to various regulatory proceedings.
Certain regulatory approvals were received from the ICC, the FERC, and the
MoPSC. An additional PUHCA-related determination that will permit the new
generating subsidiary to operate as an Exempt Wholesale Generator will be sought
from the FERC. The generating subsidiary will include most of the new combustion
turbine generators being acquired by Ameren, in addition to the AmerenCIPS
facilities (see Note 2-Regulatory Matters and Note 12 - Commitments and
Contingencies under Notes to Consolidated Financial Statements for further
information). The new subsidiary is expected to be operational in mid-2000,
subject to the outcome of these regulatory proceedings.
   Once the transfer is completed, a power sales agreement would be in place
between the new generating subsidiary and a nonregulated marketing affiliate for
all generation. The marketing affiliate would have a power sales agreement with
AmerenCIPS to supply it sufficient generation to meet native load requirements
over the term of the agreement. Power will continue to be jointly dispatched
between AmerenUE and the new generating subsidiary.
   The proposed transfer of AmerenCIPS' generating assets and liabilities had
no effect on the Company's financial statements as of December 31, 1999.

MISSOURI
   In Missouri, where approximately 73% of the Company's retail electric
revenues are derived, a task force appointed by the MoPSC investigated electric
industry restructuring and competition. In 1998 the task force issued a report
to the MoPSC that addressed many of the restructuring issues, but did not
provide a specific recommendation or approach to restructure the industry. In
addition, in 1998, the MoPSC staff issued a proposed plan for restructuring
Missouri's electric industry. The staff's plan addressed a number of issues of
concern if the industry is restructured in Missouri. It also included a proposal
for less than full recovery of strandable costs. The staff's plan has not been
addressed by the MoPSC. A joint committee of the Missouri legislature is also
conducting hearings on these issues. Several restructuring bills were introduced
by the Missouri legislature in 1999 and 2000. The Company is unable to predict
the timing or ultimate outcome of electric industry restructuring in the state
of Missouri.

SUMMARY
   In summary, the potential negative consequences associated with electric
industry restructuring could be significant and could include the impairment and
writedown of certain assets, including generation-related plant and net
regulatory assets, lower revenues, reduced profit margins and increased costs of
capital and operations expenses. The Company is actively taking steps to
mitigate these potential negative consequences. Most importantly, the Company
will continue to focus on cost control to ensure that it maintains a competitive
cost structure, which includes the recent termination of high-cost coal supply
contracts (see Note 12 - Commitments and Contingencies under Notes to
Consolidated Financial Statements for further information). Also, in Illinois,
the Company's actions include establishing a nonregulated generating subsidiary
and expanding its generation assets, strengthening the Company's trading and
marketing operations to maintain its current customers and obtain new customers,
and enhancing its information systems. The Company believes that these actions
will position the Company well in the competitive Illinois marketplace. In
Missouri, the Company is actively involved in all major deliberations taking
place surrounding electric industry restructuring in an effort to ensure that
restructuring legislation, if any, contains an orderly transition and is
equitable to the Company's shareholders. The Company is also actively involved
in shaping the policies of the Midwest ISO to protect its shareholders'
interests. At this time, the Company is unable to predict the ultimate impact of
electric industry restructuring on the Company's future financial condition,
results of operations or liquidity.

YEAR 2000 ISSUE
   The Year 2000 Issue relates to how dates are stored and used in computer
systems, applications, and embedded systems. As the century date change
occurred, certain date-sensitive systems had to recognize the year as 2000 and
not as 1900. This inability to recognize and properly treat the year as 2000
could have caused these systems to process critical financial and operational
information incorrectly. Management implemented a Year 2000 plan and briefed
Ameren's Board of Directors about the Year 2000 Issue and how it might have
affected the Company. The Company encountered no significant problems associated
with the Year

<PAGE>   8
                                                       www.ameren.com    page 21

2000 Issue at year-end. In addressing the Year 2000 Issue, the Company incurred
internal labor costs as well as external consulting and other expenses to
prepare for the new century. As of December 31, 1999, the Company had expended
approximately $8 million in external costs (consulting fees and related costs).
The impact of the Year 2000 Issue on the Company's financial condition, results
of operations or liquidity was immaterial. The Company will continue to monitor
date-sensitive systems as certain key dates occur throughout the year.

CONTINGENCIES
   See Note 2 - Regulatory Matters, Note 12 - Commitments and Contingencies and
Note 13 - Callaway Nuclear Plant under Notes to Consolidated Financial
Statements for material issues existing at December 31, 1999.

MARKET RISK RELATED TO FINANCIAL INSTRUMENTS
AND COMMODITY INSTRUMENTS
   Market risk represents the risk of changes in value of a financial
instrument, derivative or non-derivative, caused by fluctuations in market
variables (e.g., interest rates, equity prices, commodity prices, etc.). The
following discussion of the Company's risk management activities includes
"forward-looking" statements that involve risks and uncertainties. Actual
results could differ materially from those projected in the "forward-looking"
statements. The Company handles market risks in accordance with established
policies, which may include entering into various derivative transactions. In
the normal course of business, the Company also faces risks that are either
non-financial or non-quantifiable. Such risks principally include business,
legal, operational, and credit risk and are not represented in the following
analysis.

INTEREST RATE RISK
   The Company is exposed to market risk through changes in interest rates
through its issuance of both long-term and short-term variable-rate debt,
fixed-rate debt, commercial paper and auction market preferred stock. The
Company manages its interest rate exposure by controlling the amount of these
instruments it holds within its total capitalization portfolio and by monitoring
the effects of market changes in interest rates.
   If interest rates increase 1% in 2000, as compared to 1999, the
Company's interest expense would increase by approximately $9 million, and net
income would decrease by approximately $5 million. This amount has been
determined using the assumptions that the Company's outstanding variable-rate
debt, commercial paper and auction market preferred stock, as of December 31,
1999, continued to be outstanding throughout 2000, and that the average interest
rates for these instruments increased 1% over 1999. The model does not consider
the effects of the reduced level of potential overall economic activity that
would exist in such an environment. In the event of a significant change in
interest rates, management would likely take actions to further mitigate its
exposure to this market risk. However, due to the uncertainty of the specific
actions that would be taken and their possible effects, the sensitivity analysis
assumes no change in the Company's financial structure.

COMMODITY PRICE RISK
   The Company is exposed to changes in market prices for natural gas,
fuel and electricity. With regard to its natural gas utility business, the
Company's exposure to changing market prices is in large part mitigated by the
fact that the Company has Purchased Gas Adjustment Clauses (PGAs) in place in
both its Missouri and Illinois jurisdictions. The PGAs allow the Company to pass
on to its customers its prudently incurred costs of natural gas. With approval
of the MoPSC, AmerenUE participated in an experimental program to control the
volatility of gas prices paid by its Missouri customers in the 1998-1999 winter
months through the purchase of financial instruments. This program concluded in
April 1999.
   Since the Company does not have a provision similar to the PGA for its
electric operations, the Company has entered into several long-term contracts
with various suppliers to purchase coal and nuclear fuel to manage its exposure
to fuel prices. (See Note 12 - Commitments and Contingencies under Notes to
Consolidated Financial Statements for further information). With regard to the
Company's exposure to commodity price risk for purchased power and excess
electricity sales, the Company has established a subsidiary, AmerenEnergy, whose
primary responsibility includes managing market risks associated with changing
market prices for electricity purchased and sold on behalf of the Company's
operating subsidiaries, AmerenUE and AmerenCIPS.
   AmerenEnergy utilizes several techniques to mitigate its market risk
for electricity, including utilizing derivative financial instruments. A
derivative is a contract whose value is dependent on or derived from the value
of some underlying asset. The derivative financial instruments that AmerenEnergy
is allowed to utilize (which include forward contracts, futures contracts, and
option contracts) are dictated by a risk management policy, which has been
reviewed with the Auditing Committee of Ameren's Board of Directors. Compliance
with the risk management policy is the responsibility of a risk management
steering committee, consisting of Company officers and an independent risk
management officer at AmerenEnergy.
   As of December 31, 1999, the fair value of derivative financial instruments
exposed to commodity price risk was immaterial. AmerenEnergy's primary use of
derivatives has been limited to transactions that are either risk-neutral or
that reduce price risk exposure of the Company.

EQUITY PRICE RISK
   The Company maintains trust funds, as required by the Nuclear Regulatory
Commission and Missouri and Illinois state laws, to fund certain costs of
nuclear decommissioning (see Note 13 - Callaway Nuclear Plant under Notes to
Consolidated Financial Statements for further information). As of December 31,
1999, these funds were invested primarily in domestic equity securities,
fixed-rate, fixed-income securities, and cash and cash equivalents. By
maintaining a portfolio that includes long-term equity investments, the Company
is seeking to maximize the returns to be utilized to fund nuclear
decommissioning costs. However, the
<PAGE>   9
page 22  Ameren Corporation  1999 Annual Report

equity securities included in the Company's portfolio are exposed to price
fluctuations in equity markets, and the fixed-rate, fixed-income securities are
exposed to changes in interest rates. The Company actively monitors its
portfolio by benchmarking the performance of its investments against certain
indices and by maintaining, and periodically reviewing, established target
allocation percentages of the assets of its trusts to various investment
options. The Company's exposure to equity price market risk is in large part
mitigated due to the fact that the Company is currently allowed to recover its
decommissioning costs in its rates.

ACCOUNTING MATTERS
   In June 1998, the Financial Accounting Standards Board (FASB) issued
Statement of Financial Accounting Standards (SFAS) No. 133, "Accounting for
Derivative Instruments and Hedging Activities." SFAS 133 establishes accounting
and reporting standards for derivative instruments, including certain derivative
instruments embedded in other contracts, and for hedging activities and requires
recognition of all derivatives as either assets or liabilities on the balance
sheet measured at fair value. The intended use of the derivatives and their
designation as either a fair value hedge, a cash flow hedge, or a foreign
currency hedge will determine when the gains or losses on the derivatives are to
be reported in earnings and when they are to be reported as a component of other
comprehensive income. In June 1999, the FASB issued SFAS No. 137, "Accounting
for Derivative Instruments and Hedging Activities - Deferral of the Effective
Date of FASB Statement No. 133," which delayed the effective date of SFAS 133 to
all fiscal quarters of all fiscal years, beginning after June 15, 2000. Earlier
application is still encouraged. The Company expects to adopt SFAS 133 in the
first quarter of 2001.
   The Company is currently evaluating the impact of SFAS 133 on its financial
position and results of operations upon adoption. The Company's evaluation
includes reviewing existing derivative instruments and contracts to determine
the appropriate accounting for these items under SFAS 133. At this time,
management believes that adoption of SFAS 133 will not have a material impact on
the Company's financial position or results of operations upon adoption based on
the derivative instruments which existed as of December 31, 1999. However,
changing market conditions, the volume of future transactions which may fall
within the scope of SFAS 133, and potential amendments to SFAS 133 could change
management's current assessment. As a result, SFAS 133 could increase the
volatility of the Company's future earnings and could be material to the
Company's financial position and results of operations upon adoption.

EFFECTS OF INFLATION AND CHANGING PRICES
   The Company's rates for retail electric and gas utility service are
generally regulated by the MoPSC and the ICC. 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
might not be adequate to replace plants in future years. Regulatory practice has
been modified for the Company's generation portion of its business in its
Illinois jurisdiction and may be modified in the future for the Company's
Missouri jurisdiction (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 the Illinois retail jurisdiction, the cost of fuel for electric
generation, which was previously reflected in billings to customers through
Uniform Fuel Adjustment Clauses, has been added to base rates as provided for in
the Illinois Law (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.
In Illinois and Missouri, changes in gas costs are generally reflected in
billings to customers through Purchased Gas Adjustment Clauses.
   Inflation continues to be a factor affecting operations, earnings,
stockholders' equity and financial performance.

SAFE HARBOR STATEMENT
   Statements made in this annual report to stockholders 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, financial performance and the Year 2000 Issue. 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. The following factors, in addition to those discussed
elsewhere in this report and in subsequent securities filings, could cause
results to differ materially from management expectations as suggested by such
"forward-looking" statements: the effects of regulatory actions; changes in laws
and other governmental actions; the impact on the Company of current regulations
related to the phasing-in of the opportunity for some customers to choose
alternative energy suppliers in Illinois; the effects of increased competition
in the future due to, among other things, deregulation of certain aspects of the
Company's business at both the state and Federal levels; future market prices
for fuel and purchased power, electricity, and natural gas, including the use of
financial instruments; average rates for electricity in the Midwest; business
and economic conditions; interest rates; weather conditions; fuel prices and
availability; generation plant performance; the impact of current environmental
regulations on utilities and generating companies and the expectation that more
stringent requirements will be introduced over time, which could potentially
have a negative financial effect; monetary and fiscal policies; future wages and
employee benefits costs; and legal and administrative proceedings.
<PAGE>   10

                                                          www.ameren.com page 23

CONSOLIDATED STATEMENT OF INCOME

<TABLE>
<CAPTION>
Thousands of Dollars,
Except Share and Per Share Amounts                   Year Ended December 31,     1999                  1998                 1997
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                                         <C>                  <C>                  <C>
OPERATING REVENUES:
  Electric                                                                  $   3,287,590        $   3,094,211        $   3,064,177
  Gas                                                                             228,298              216,681              249,815
  Other                                                                             7,743                7,316               12,551
                                                                            --------------------------------------------------------
     TOTAL OPERATING REVENUES                                                   3,523,631            3,318,208            3,326,543
                                                                            --------------------------------------------------------
OPERATING EXPENSES:
  Operations
   Fuel and purchased power                                                       973,277              780,123              836,445
   Gas                                                                            131,449              118,846              160,679
   Other                                                                          629,482              647,157              585,214
                                                                            --------------------------------------------------------
                                                                                1,734,208            1,546,126            1,582,338
                                                                            --------------------------------------------------------
  Maintenance                                                                     370,873              312,011              310,241
  Depreciation and amortization                                                   350,539              348,403              346,000
  Income taxes                                                                    258,870              267,673              234,179
  Other taxes                                                                     246,592              272,774              271,711
                                                                            --------------------------------------------------------
     TOTAL OPERATING EXPENSES                                                   2,961,082            2,746,987            2,744,469
                                                                            --------------------------------------------------------


OPERATING INCOME                                                                  562,549              571,221              582,074
                                                                            --------------------------------------------------------
OTHER INCOME AND (DEDUCTIONS):
  Allowance for equity funds used during construction                               7,161                5,001                5,244
  Miscellaneous, net                                                              (10,813)              (2,609)             (10,344)
                                                                            --------------------------------------------------------
     TOTAL OTHER INCOME AND (DEDUCTIONS)                                           (3,652)               2,392               (5,100)
                                                                            --------------------------------------------------------

INCOME BEFORE INTEREST CHARGES AND PREFERRED DIVIDENDS                            558,897              573,613              576,974
                                                                            --------------------------------------------------------

INTEREST CHARGES AND PREFERRED DIVIDENDS:
  Interest                                                                        168,275              181,580              185,368
  Allowance for borrowed funds used during construction                            (7,123)              (7,026)              (7,462)
  Preferred dividends of subsidiaries                                              12,650               12,562               12,532
                                                                            --------------------------------------------------------
     NET INTEREST CHARGES AND PREFERRED DIVIDENDS                                 173,802              187,116              190,438
                                                                            --------------------------------------------------------

INCOME BEFORE EXTRAORDINARY CHARGE                                                385,095              386,497              386,536

EXTRAORDINARY CHARGE, NET OF INCOME TAXES (NOTE 2)                                   --                   --                (51,820)
                                                                            --------------------------------------------------------

NET INCOME                                                                  $     385,095        $     386,497        $     334,716
                                                                            --------------------------------------------------------
EARNINGS PER COMMON SHARE - BASIC AND DILUTED
     (BASED ON AVERAGE SHARES OUTSTANDING)
  Income before extraordinary charge                                        $        2.81        $        2.82        $        2.82
  Extraordinary charge                                                               --                   --                   (.38)
                                                                            --------------------------------------------------------
  NET INCOME                                                                $        2.81        $        2.82        $        2.44
                                                                            --------------------------------------------------------
AVERAGE COMMON SHARES OUTSTANDING                                             137,215,462          137,215,462          137,215,462
                                                                            --------------------------------------------------------
</TABLE>

See Notes to Consolidated Financial Statements.

<PAGE>   11

page 24  Ameren Corporation  1999 Annual Report

CONSOLIDATED BALANCE SHEET

<TABLE>
<CAPTION>
Thousands of Dollars                                                   December 31,                  1999                   1998
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                                                              <C>                     <C>
ASSETS
PROPERTY AND PLANT, AT ORIGINAL COST:
  Electric                                                                                       $12,053,411             $11,761,306
  Gas                                                                                                491,708                 469,216
  Other                                                                                               92,696                  44,646
                                                                                                 -----------------------------------
                                                                                                  12,637,815              12,275,168
  Less accumulated depreciation and amortization                                                   5,891,340               5,602,816
                                                                                                 -----------------------------------
                                                                                                   6,746,475               6,672,352

  Construction work in progress:
     Nuclear fuel in process                                                                          88,830                 108,294
     Other                                                                                           329,880                 147,393
                                                                                                 -----------------------------------
     TOTAL PROPERTY AND PLANT, NET                                                                 7,165,185               6,928,039
                                                                                                 -----------------------------------

INVESTMENTS AND OTHER ASSETS:
  Investments                                                                                         66,476                  86,694
  Nuclear decommissioning trust fund                                                                 186,760                 161,877
  Other                                                                                               80,737                  78,091
                                                                                                 -----------------------------------
     TOTAL INVESTMENTS AND OTHER ASSETS                                                              333,973                 326,662
                                                                                                 -----------------------------------

CURRENT ASSETS:
  Cash and cash equivalents                                                                          194,882                  76,863
  Accounts receivable - trade (less allowance for doubtful
     accounts of $7,136 and $8,393, respectively)                                                    216,344                 198,193
  Unbilled revenue                                                                                   154,097                 150,481
  Other accounts and notes receivable                                                                 20,668                  76,919
  Materials and supplies, at average cost:
     Fossil fuel                                                                                     123,143                 112,908
     Other                                                                                           130,081                 132,884
  Other                                                                                               39,791                  22,912
                                                                                                 -----------------------------------
     TOTAL CURRENT ASSETS                                                                            879,006                 771,160
                                                                                                 -----------------------------------
REGULATORY ASSETS:
  Deferred income taxes                                                                              622,520                 633,529
  Other                                                                                              176,931                 188,049
                                                                                                 -----------------------------------
     TOTAL REGULATORY ASSETS                                                                         799,451                 821,578
                                                                                                 -----------------------------------
TOTAL ASSETS                                                                                     $ 9,177,615             $ 8,847,439
                                                                                                 -----------------------------------
</TABLE>


See Notes to Consolidated Financial Statements.


<PAGE>   12
                                                       www.ameren.com    page 25

<TABLE>
<CAPTION>

Thousands of Dollars, Except Share and Per Share Amounts                          December 31,        1999                   1998
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                                                                 <C>                   <C>
CAPITAL AND LIABILITIES
CAPITALIZATION:
 Common stock, $.01 par value, 400,000,000 shares authorized -
     137,215,462 shares outstanding (Note 6)                                                        $    1,372            $    1,372
  Other paid-in capital, principally premium on common stock                                         1,582,501             1,582,548
  Retained earnings (see accompanying statement)                                                     1,505,827             1,472,200
                                                                                                    --------------------------------
     Total Common Stockholders' Equity                                                               3,089,700             3,056,120
  Preferred stock not subject to mandatory redemption (Note 6)                                         235,197               235,197
  Long-term debt (Note 8)                                                                            2,448,448             2,289,424
                                                                                                    --------------------------------
   TOTAL CAPITALIZATION                                                                              5,773,345             5,580,741
                                                                                                    --------------------------------

MINORITY INTEREST IN CONSOLIDATED SUBSIDIARIES                                                           4,010                 3,534
                                                                                                    --------------------------------



CURRENT LIABILITIES:
  Current maturity of long-term debt (Note 8)                                                          128,867               201,713
  Short-term debt                                                                                       80,165                58,528
  Accounts and wages payable                                                                           341,274               284,818
  Accumulated deferred income taxes                                                                     70,719                66,299
  Taxes accrued                                                                                        155,396               114,106
  Other                                                                                                300,747               216,889
                                                                                                    --------------------------------
     TOTAL CURRENT LIABILITIES                                                                       1,077,168               942,353
                                                                                                    --------------------------------



Commitments and Contingencies (Notes 2, 12 and 13)
Accumulated deferred income taxes                                                                    1,493,634             1,521,417
Accumulated deferred investment tax credits                                                            170,834               178,832
Regulatory liability                                                                                   188,404               198,937
Other deferred credits and liabilities                                                                 470,220               421,625
                                                                                                    --------------------------------

TOTAL CAPITAL AND LIABILITIES                                                                       $9,177,615            $8,847,439
                                                                                                    ================================
</TABLE>

See Notes to Consolidated Financial Statements.

<PAGE>   13

page 26  Ameren Corporation  1999 Annual Report

CONSOLIDATED STATEMENT OF CASH FLOWS

<TABLE>
<CAPTION>
Thousands of Dollars                              Year Ended December 31,            1999                1998                1997
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                                               <C>                 <C>                 <C>
CASH FLOWS FROM OPERATING:
  Income before extraordinary charge                                              $ 385,095           $ 386,497           $ 386,536
  Adjustments to reconcile net income to net cash
   provided by operating activities:
   Depreciation and amortization                                                    340,329             338,488             340,079
   Amortization of nuclear fuel                                                      36,068              36,855              37,126
   Allowance for funds used during construction                                     (14,284)            (12,027)            (12,706)
   Deferred income taxes, net                                                       (22,578)            (24,849)            (24,499)
   Deferred investment tax credits, net                                              (7,998)            (11,428)            (18,967)
   Changes in assets and liabilities:
     Receivables, net                                                                34,484              (6,658)             11,476
     Materials and supplies                                                          (7,432)            (18,209)             16,523
     Accounts and wages payable                                                      56,456              (8,573)             (3,626)
     Taxes accrued                                                                   41,290               3,540              45,321
     Other                                                                           76,145             119,608             (68,820)
                                                                                  --------------------------------------------------
       NET CASH PROVIDED BY OPERATING ACTIVITIES                                    917,575             803,244             708,443
                                                                                  --------------------------------------------------

CASH FLOWS FROM INVESTING:
  Construction expenditures                                                        (570,807)           (324,905)           (380,593)
  Allowance for funds used during construction                                       14,284              12,027              12,706
  Nuclear fuel expenditures                                                         (21,901)            (20,432)            (35,432)
  Other                                                                              20,218              10,494              16,122
                                                                                  --------------------------------------------------
       NET CASH USED IN INVESTING ACTIVITIES                                       (558,206)           (322,816)           (387,197)
                                                                                  --------------------------------------------------

CASH FLOWS FROM FINANCING:
  Dividends on common stock                                                        (348,527)           (348,527)           (331,282)
  Redemptions:
   Nuclear fuel lease                                                               (15,138)            (67,720)            (28,292)
   Short-term debt                                                                     --               (27,738)               --
   Long-term debt                                                                  (174,444)           (273,444)           (123,444)
   Preferred stock                                                                     --                  --               (63,924)
  Issuances:
   Nuclear fuel lease                                                                64,972              16,439              40,337
   Short-term debt                                                                   21,637                --                17,198
   Long-term debt                                                                   210,150             255,000             187,000
                                                                                  --------------------------------------------------
       NET CASH USED IN FINANCING ACTIVITIES                                       (241,350)           (445,990)           (302,407)
                                                                                  --------------------------------------------------
       NET CHANGE IN CASH AND CASH EQUIVALENTS                                      118,019              34,438              18,839
       CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR                                76,863              42,425              23,586
                                                                                  --------------------------------------------------
CASH AND CASH EQUIVALENTS AT END OF YEAR                                          $ 194,882           $  76,863           $  42,425
                                                                                  ==================================================
Cash paid during the periods:
  Interest (net of amount capitalized)                                            $ 162,705           $ 175,168           $ 162,459
  Income taxes                                                                    $ 247,428           $ 298,589           $ 249,477

</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 under Notes to Consolidated Financial Statements for further
information.

See Notes to Consolidated Financial Statements.

<PAGE>   14

                                                       www.ameren.com    page 27


CONSOLIDATED STATEMENT OF RETAINED EARNINGS

<TABLE>
<CAPTION>
Thousands of Dollars                        Year Ended December 31,           1999             1998           1997
- ---------------------------------------------------------------------------------------------------------------------
<S>                                                                       <C>               <C>            <C>
BALANCE AT BEGINNING OF PERIOD                                            $1,472,200        $1,434,658     $1,431,295
   Add:
      Net income                                                             385,095           386,497        334,716

   Deduct:
      Dividends                                                              351,468           348,955        331,353
                                                                          -------------------------------------------
BALANCE AT CLOSE OF PERIOD                                                $1,505,827        $1,472,200     $1,434,658
                                                                          ===========================================
</TABLE>


SELECTED QUARTERLY INFORMATION
(Unaudited)

<TABLE>
<CAPTION>
Thousands of Dollars, Except Per Share Amounts
- -------------------------------------------------------------------------------------------------------------------------
Quarter Ended                                Operating             Operating           Net Income        Earnings (Loss)
                                              Revenues               Income              (Loss)          Per Common Share
<S>                                        <C>                     <C>                 <C>               <C>

MARCH 31, 1999 (a)                         $   735,902             $ 99,687            $ 54,359             $ .40
March 31, 1998 (a)                             700,810               90,432              39,927               .29
                                           -------------------------------------------------------------------------------
JUNE 30, 1999                                  859,884              130,512              86,519               .63
June 30, 1998 (b)                              821,777              128,158              83,632               .61
                                           -------------------------------------------------------------------------------
SEPTEMBER 30, 1999                           1,193,462              296,727             249,819              1.82
September 30, 1998 (c)                       1,117,118              283,652             236,657              1.73
                                           -------------------------------------------------------------------------------
DECEMBER 31, 1999 (d)                          734,383               35,623              (5,602)             (.04)
December 31, 1998                              678,503               68,979              26,281               .19
                                           ===============================================================================
</TABLE>


(a) The first quarter of 1999 and 1998 included credits to Missouri electric
    customers that reduced net income approximately $11 million, or 8 cents per
    share, and $6 million, or 4 cents per share, respectively.
(b) The second quarter of 1998 included credits to Missouri electric customers
    that reduced net income approximately $18 million, or 14 cents per share.
    Callaway Plant refueling expenses, which decreased net income approximately
    $18 million, or 13 cents per share, were also included in the second quarter
    of 1998.
(c) The third quarter of 1998 included a nonrecurring charge related to the
    targeted employee separation plan that reduced net income $15 million, or 11
    cents per share. (See Note 3 - Targeted Separation Plan under Notes to
    Consolidated Financial Statements for further information).
(d) The fourth quarter of 1999 included adjustments that increased earnings $9
    million, or 6 cents per share, as a result of a Report and Order received
    from the Missouri Public Service Commission relating to the Company's
    alternative regulation plan. (See Note 2 - Regulatory Matters under Notes to
    Consolidated Financial Statements for further information). The fourth
    quarter of 1999 also included a charge of $31 million, or 23 cents per
    share, for coal supply contract terminations. (See Note 12 - Commitments and
    Contingencies under Notes to Consolidated Financial Statements for further
    information). In addition, Callaway Plant refueling expenses, which
    decreased net income approximately $22 million, or 16 cents per share, were
    included in the fourth quarter of 1999.
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.

<PAGE>   15

page 28  Ameren Corporation  1999 Annual Report

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

NOTE 1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
BASIS OF PRESENTATION
   Ameren Corporation (Ameren) is a holding company 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 subsidiaries
of 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 shares
of AmerenUE and AmerenCIPS were 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. The operating companies
serve 1.5 million electric and 300,000 natural gas customers in a
44,500-square-mile area of Missouri and Illinois. The Company's nonregulated
subsidiaries include CIC, an investing subsidiary; AmerenEnergy, Inc., an energy
marketing subsidiary; Ameren Development Company, a nonregulated products and
services subsidiary; Ameren Intermediate Holding Company, a holding company for
the proposed Illinois nonregulated generating subsidiary and its proposed
marketing affiliate (see Note 2 - Regulatory Matters for further information);
and Ameren Services Company, a shared support services subsidiary. The Company
also has a 60% interest in Electric Energy, Inc. (EEI). EEI owns and operates an
electric generation 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.

REGULATION
   Ameren 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 U.S. 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. An allowance for funds used during construction is also added for the
Company's regulated assets, and interest during construction is added for
nonregulated assets. 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 value, 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 1999, 1998 and 1997 was approximately 3% of the
average depreciable cost.

FUEL AND GAS COSTS
   In the Missouri and Illinois retail electric jurisdictions, the cost of fuel
for electric generation is reflected in base rates with no provision for changes
to be made through fuel adjustment clauses. (See Note 2 - Regulatory Matters for
further information.) In the Illinois jurisdiction in 1997, changes in fuel
costs were generally reflected in billings to electric customers through fuel
adjustment clauses. In the Illinois and Missouri retail gas jurisdictions,
changes in gas costs are generally reflected in billings to gas customers
through purchased gas adjustment clauses.

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 net kilowatthours
generated and sold.

CASH AND CASH EQUIVALENTS
   Cash and cash equivalents include cash on hand and temporary investments
purchased with an original 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
regulated 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 ratemaking 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 were 5% - 10% during
1999, 6% - 9% during 1998, and 8% - 9% during 1997.

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.

<PAGE>   16

                                                       www.ameren.com    page 29

ENERGY CONTRACTS
   The Emerging Issues Task Force of the Financial Accounting Standards Board
(EITF) Issue 98-10, "Accounting for Energy Trading and Risk Management
Activities" became effective on January 1, 1999. EITF 98-10 provides guidance on
the accounting for energy contracts entered into for the purchase or sale of
electricity, natural gas, capacity and transportation. The EITF reached a
consensus in EITF 98-10 that sales and purchase activities being performed need
to be classified as either trading or nontrading. Furthermore, transactions that
are determined to be trading activities would be recognized on the balance sheet
measured at fair value, with gains and losses included in earnings.
AmerenEnergy, Inc., an energy marketing subsidiary of Ameren, enters into
contracts for the sale and purchase of energy on behalf of AmerenUE and
AmerenCIPS. Currently, virtually all of AmerenEnergy's transactions are
considered nontrading activities and are accounted for using the accrual or
settlement method, which represents industry practice. EITF 98-10 did not have a
material impact on the Company's financial position or results of operations
upon adoption.

SOFTWARE
   Statement of Position (SOP) 98-1, "Accounting for the Costs of Computer
Software Developed or Obtained for Internal Use" became effective on January 1,
1999. SOP 98-1 provides guidance on accounting for the costs of computer
software developed or obtained for internal use. Under SOP 98-1, certain costs
may be capitalized and amortized over some future period. SOP 98-1 did not have
a material impact on the Company's financial position or results of operations
upon adoption.

EVALUATION OF ASSETS FOR IMPAIRMENT
   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"
prescribes general standards for the recognition and measurement of impairment
losses. The Company determines if long-lived assets are impaired by comparing
their undiscounted expected future cash flows to their carrying amount. An
impairment loss is recognized if the undiscounted expected future cash flows are
less than the carrying amount of the asset. SFAS 121 also 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). As of December 31, 1999, no impairment was identified.

STOCK COMPENSATION PLANS
   The Company applies Accounting Principles Board Opinion (APB) 25, "Accounting
for Stock Issued to Employees" in accounting for its plans. See Note 11 - Stock
Option Plans for further information.

EARNINGS PER SHARE
   The Company's calculation of basic and diluted earnings per share resulted in
the same earnings per share amounts for each of the years 1999, 1998 and 1997.
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 38,786 shares, 29,787 shares and 7,318 shares
in 1999, 1998 and 1997, respectively.

USE OF ESTIMATES
   The preparation of Financial statements in conformity with GAAP requires
management to make certain estimates and assumptions. Such estimates and
assumptions 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 1999 reporting.

NOTE 2
REGULATORY MATTERS
MISSOURI ELECTRIC
   In July 1995, the MoPSC approved an agreement establishing contractual
obligations involving the Company's Missouri retail electric rates. Included was
a three-year experimental alternative regulation plan (the Original Plan) that
ran from July 1, 1995, through June 30, 1998, which provided that earnings in
those years in excess of a 12.61% regulatory return on equity (ROE) be shared
equally between customers and stockholders, and earnings above a 14% ROE be
credited to customers. The formula for computing the credit used twelve-month
results ending June 30, rather than calendar year earnings. In 1996, the Company
recorded a $47 million credit for the first year of the Original Plan. This
credit reduced earnings $28 million, or 20 cents per share. During 1997, the
Company recorded a $20 million credit for the second year of the Original Plan,
which reduced earnings $11 million, or 8 cents per share. In 1998, the Company
recorded an estimated $43 million credit for the final year of the Original
Plan, which reduced earnings $26 million, or 18 cents per share.
   Included in the joint agreement approved by the MoPSC in its February 1997
order authorizing the Merger, was a new three-year experimental alternative
regulation plan (the New Plan) that runs from July 1, 1998, through June 30,
2001. Like the Original Plan, the New Plan requires that earnings over a 12.61%
ROE up to a 14% ROE be shared equally between customers and shareholders. The
New Plan also returns to customers 90% of all earnings above a 14% ROE up to a
16% ROE. Earnings above a 16% ROE are credited entirely to customers. In
addition, the joint agreement provides for a Missouri electric rate decrease,
retroactive to September 1, 1998, based on the weather-adjusted average annual
credits to customers under the Original Plan. The Company estimated that its
Missouri electric rate decrease should approximate $20 million on an annualized
basis and reduced revenues accordingly since September 1998.
   In November 1998, the MoPSC staff proposed adjustments to the customer credit
for the third year of the Original Plan. In addition, the MoPSC staff proposed
adjustments to the Company's estimated Missouri electric rate decrease based
upon their methodology of calculating the weather-adjusted credits. The
determination of the credit for the third year of the Original Plan, as well as
the determination of the Missouri electric rate decrease, were subject to
regulatory proceedings before the MoPSC in 1999.
   On December 23, 1999, the MoPSC issued a Report and Order (Order) related to
the customer credit for the third year of the Original Plan. Certain of the
MoPSC staff's proposed adjustments were accepted by the MoPSC in the Order. In
addition, the Order requires the Company to capitalize and amortize certain
costs (including computer software costs) that had previously been expensed for
its Missouri electric operations.


<PAGE>   17

page 30  Ameren Corporation  1999 Annual Report

   Based on the provisions of the Order, the Company estimates that the credit
for the third year of the Original Plan will approximate $31 million. In
addition, with regard to the Missouri electric rate decrease, the Company, the
MoPSC staff, and other parties reached a settlement related to the calculation
of the weather-adjusted credits. As a result, the Company estimates that the
annualized Missouri electric rate decrease will approximate $17 million. Both of
these estimates are subject to final approval of the MoPSC.
   The provisions of the Order also have an impact on the estimated credit to
electric customers recorded by the Company for the first year of the New Plan.
As a result, the Company recorded an estimated credit of $25 million for the
plan year ended June 30, 1999. In addition, the Company recorded an estimated
$20 million credit for the 1999 portion of the second year of the New Plan.
Also, the provision of the Order which requires the Company to capitalize and
amortize certain costs (including computer software costs) that had been
previously expensed resulted in the capitalization of approximately $20 million
of costs in the fourth quarter of 1999.
   In summary, the provisions of the Order and the resulting changes in the
Company's estimates of credits and Missouri electric rate decrease for the open
years under the Original Plan and the New Plan resulted in an increase in
earnings of approximately $9 million, or 6 cents per share in the fourth quarter
of 1999.
   On December 30, 1999, the Company filed a request for rehearing with the
MoPSC, asking that it reconsider its decision to adopt certain of the MoPSC
staff's adjustments. On January 25, 2000, the MoPSC denied the Company's
request. The Company plans to file an appeal with the courts.

GAS
   In February 1999, the ICC approved a $9 million total annual rate increase
for natural gas service in AmerenUE's and AmerenCIPS' Illinois jurisdictions.
The increase became effective in February 1999.
   In December 1997, the MoPSC approved a $12 million annual rate increase for
natural gas service in AmerenUE's Missouri jurisdiction. The rate increase
became effective in February 1998.

MIDWEST ISO
   In 1998, Ameren's operating subsidiaries joined a group of companies that
support the formation of the Midwest Independent System Operator (Midwest ISO).
An ISO operates, but does not own, electric transmission systems and maintains
system reliability and security while alleviating pricing issues associated with
the "pancaking" of rates. The Midwest ISO would be regulated by the FERC.
Thirteen transmission-owning utilities have joined the Midwest ISO, as of
December 31, 1999. The FERC conditionally approved the formation of the Midwest
ISO in September 1998, and it is expected to be operational during the year
2001. The MoPSC and the ICC have authorized AmerenUE and AmerenCIPS to join the
Midwest ISO and to transfer control of their transmission facilities to the
Midwest ISO. The Midwest ISO covers 14 states, represents portions of 60,000
miles of transmission line and controls $8 billion in assets. The Company
believes that the operation of the Midwest ISO will not have a material adverse
effect on its financial condition, results of operations or liquidity.
   In December 1999, the FERC issued its Order 2000 relating to Regional
Transmission Organizations (RTOs) that would meet certain characteristics such
as size and independence. Order 2000 calls on all transmission owners to join
RTOs. In particular, all public utilities that own, operate, or control
interstate transmission facilities must file with the FERC by October 15, 2000,
a proposal for an RTO, or alternatively a description of efforts by the utility
to join an RTO. The Company expects that its participation in the Midwest ISO
will satisfy the requirements of Order 2000.

ILLINOIS ELECTRIC RESTRUCTURING
   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 Illinois Law) providing for electric utility restructuring in Illinois.
This legislation introduces competition into the supply of electric energy at
retail in Illinois.
   Under the Illinois Law, retail direct access, which allows customers to
choose their electric generation suppliers, 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.
   As a requirement of the Illinois Law, in March 1999, AmerenUE and AmerenCIPS
filed delivery service tariffs with the ICC. These tariffs would be used by
electric customers who choose to purchase their power from alternate suppliers.
On August 25, 1999, the ICC issued an order approving the delivery services
tariffs, with an allowed rate of return on equity of 10.45%. AmerenUE and
AmerenCIPS filed a joint petition for rehearing of that order requesting the ICC
to alter its conclusions on a number of issues. On October 13, 1999, the ICC
granted a rehearing on certain issues. An order on this reopened proceeding is
expected in early 2000.
   The Illinois Law included a 5% residential electric rate decrease for the
Company's Illinois electric customers, effective August 1, 1998. This rate
decrease reduced electric revenues approximately $8 million in 1999. 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.
   As a result of the Illinois Law, AmerenUE and AmerenCIPS filed proposals with
the ICC to eliminate their electric fuel adjustment clauses for Illinois retail
customers, thereby including historical levels of fuel costs in base rates. The
ICC approved AmerenUE's and AmerenCIPS' filings in early 1998.
   The Illinois Law also contains a provision requiring that one-half of excess
earnings from the Illinois jurisdiction for the years 1998 through 2004 be
refunded to Ameren's Illinois customers. Excess earnings are defined as the
portion of the two-year average annual rate of return on common equity in excess
of 1.5% of the two-year average of an Index, as defined in the Illinois Law. The
Index is defined as the sum of the average for the twelve months ended September
30 of the average monthly yields of the 30-year US Treasury bonds, plus
prescribed percentages ranging from 4% to 7%. Filings must be made with the ICC
on, or before, March 31 of each year 2000 through 2005. As of December 31, 1999,
the Company recorded an estimated $5 million credit it expects to return to its
customers under the Illinois Law for the two-year period ended December 31,
1999.
   In conjunction with another provision of the Illinois Law, in July 1999,
AmerenCIPS filed a notice with the ICC that it intends to transfer AmerenCIPS'
generating facilities (all in Illinois) to a new nonregulated subsidiary of
Ameren. The formation of the new generating subsidiary, as well as the transfer
of AmerenCIPS' generating assets and liabilities (at historical

<PAGE>   18

                                                       www.ameren.com    page 31

net book value) and certain power sales contracts, are subject to various
regulatory proceedings. Certain regulatory approvals were received from the ICC,
the FERC, and the MoPSC. An additional PUHCA-related determination that will
permit the new generating subsidiary to operate as an Exempt Wholesale Generator
will be sought from the FERC. The generating subsidiary will include most of the
new combustion turbine generators being acquired by Ameren in addition to the
AmerenCIPS facilities. (See Note 12 - Commitments and Contingencies for further
information.) The new generating subsidiary is expected to be operational in
mid-2000, subject to the outcome of these regulatory proceedings. The proposed
transfer of AmerenCIPS' generating assets and liabilities had no effect on
Ameren's financial statements as of December 31, 1999.
   Once the transfer is completed, a power sales agreement would be in place
between the new generating subsidiary and a nonregulated marketing affiliate for
all generation. The marketing affiliate would have a power sales agreement with
AmerenCIPS to supply it sufficient generation to meet native load requirements
over the term of the agreement. Power will continue to be jointly dispatched
between AmerenUE and the new generating subsidiary.
   Other provisions of the Illinois Law include (1) potential recovery of a
portion of strandable costs, which represent costs which would not be
recoverable in a restructured environment, through a transition charge collected
from customers who choose another electric supplier; (2) a mechanism to
securitize certain future revenues; and (3) a provision relieving the Company of
the requirement to file electric rate cases or alternative regulatory plans in
Illinois, following the consummation of the Merger to reflect the effects of net
merger savings.
   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 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) that 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 that no longer meets the SFAS 71 criteria. The
EITF has 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). Those assets can therefore continue to be carried on the regulated
entity's balance sheet to the extent such assets are recoverable. In addition,
SFAS 121 establishes accounting standards for the impairment of long-lived
assets.
   Due to the enactment of the Illinois Law, 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 evaluated the impact of the Illinois Law on
the future recoverability of its regulatory assets and liabilities related to
the generation portion of its business and determined that it was not probable
that such assets and liabilities would 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 coal contract restructuring costs, deferred charges related to a
generating plant, costs associated with an abandoned scrubber at a generating
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 has 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 writedowns are necessary at this time. At
December 31, 1999, the Company's net investment in generation facilities related
to its Illinois retail jurisdiction approximated $861 million and was included
in electric plant in-service on the Company's consolidated balance sheet.
   In August 1999, the Company filed a transmission system rate case with the
FERC. This filing was primarily designed to implement rates, terms and
conditions for transmission service for those retail customers in Illinois who
choose other suppliers as allowed under the Illinois Law. On October 14, 1999,
the FERC issued an order suspending the proposed rates until March 25, 2000. In
January 2000, a settlement in principle was reached with the FERC trial staff
and other interested parties. The settlement establishes the rates for
transmission service that are to go into effect in the first quarter of 2000.
The settlement is subject to approval by the FERC. The Company expects that the
FERC will approve the settlement in 2000.
   The provisions of the Illinois Law could also result in lower revenues,
reduced profit margins and increased costs of capital and operations expense. At
this time, the Company is unable to determine the impact of the Illinois Law on
the Company's future financial condition, results of operations or liquidity.

MISSOURI ELECTRIC RESTRUCTURING
   In Missouri, where approximately 73% of the Company's retail electric
revenues are derived, a task force appointed by the MoPSC investigated electric
industry restructuring and competition. In 1998, the task force issued a report
to the MoPSC that addressed many of the restructuring issues but did not provide
a specific recommendation or approach to restructure the industry. In addition,
in 1998, the MoPSC staff issued a proposed plan for restructuring Missouri's
electric industry. The staff's plan addressed a number of issues of

<PAGE>   19


page 32  Ameren Corporation  1999 Annual Report

concern if the industry is restructured in Missouri. It also included a proposal
for less than full recovery of strandable costs. The staff's plan has not been
addressed by the MoPSC. A joint committee of the Missouri legislature is also
conducting hearings on these issues. Several restructuring bills were introduced
by the Missouri legislature in 1999 and 2000.
   The Company is unable to predict the timing or ultimate outcome of electric
industry restructuring in the state of Missouri, as well as the impact of
potential electric industry restructuring matters 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 and operations expense. At December 31, 1999, the
Company's net investment in generation facilities related to its Missouri
jurisdiction approximated $2.6 billion and was included in electric plant
in-service on the Company's balance sheet. In addition, at December 31, 1999,
the Company's Missouri net generation-related regulatory assets approximated
$454 million.

REGULATORY ASSETS AND LIABILITIES
   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                                                1999        1998
- ----------------------------------------------------------------------------
<S>                                                        <C>          <C>
REGULATORY ASSETS:
  Income taxes                                             $623         $634
  Callaway costs                                             92           95
  Unamortized loss on reacquired debt                        31           33
  Merger costs                                               27           24
  Other                                                      26           36
                                                           -----------------
Regulatory Assets                                          $799         $822
                                                           -----------------

REGULATORY LIABILITY:
  Income taxes                                             $188         $199
                                                           -----------------
Regulatory Liability                                       $188         $199
                                                           -----------------
</TABLE>

Income Taxes:  See Note 9 - 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).
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.
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 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.

NOTE 3
TARGETED SEPARATION PLAN
   In July 1998, the Company offered separation packages to employees whose
positions were eliminated through a targeted separation plan (TSP). During the
third quarter of 1998, a nonrecurring, pretax charge of $25 million was
recorded, reducing earnings $15 million, or 11 cents per share. This represented
costs incurred to implement the TSP.

NOTE 4
CONCENTRATION OF RISK
MARKET RISK
   The Company engages in price risk management activities related to
electricity and fuel. In addition to buying and selling these commodities, the
Company uses derivative financial instruments to manage market risks and reduce
exposure resulting from fluctuations in interest rates and the prices of
electricity and fuel. Derivative instruments used include futures, forward
contracts and options. The use of these types of contracts allows the Company to
manage and hedge its contractual commitments and reduce exposure related to the
volatility of commodity market prices.

CREDIT RISK
   Credit risk represents the loss that would be recognized if counterparties
fail to perform as contracted. New York Mercantile Exchange (NYMEX) traded
futures contracts are guaranteed by NYMEX and have nominal credit risk. On all
other transactions, the Company is exposed to credit risk in the event of
nonperformance by the counterparties in the transaction.
   The Company's financial instruments subject to credit risk consist primarily
of trade accounts receivables and forward contracts. The risk associated with
trade receivables is mitigated by the large number of customers in a broad range
of industry groups comprising the Company's customer base. The Company's
revenues are primarily derived from sales of electricity and natural gas to
customers in Missouri and Illinois. For each counterparty in forward contracts,
the Company analyzes the counterparty's financial condition prior to entering
into an agreement, establishes credit limits and monitors the appropriateness of
these limits on an ongoing basis through a credit risk management program.

NOTE 5
NUCLEAR FUEL LEASE
   The Company has a lease agreement that provides for the financing of nuclear
fuel. At December 31, 1999, the maximum 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 $16 million in 1999, $23 million during 1998 and
$31 million during 1997.

<PAGE>   20
                                                       www.ameren.com    page 33

   The Company has capitalized the cost, including certain interest costs, of
the leased nuclear fuel and has recorded the related lease obligation. Total
interest charges under the lease were $5 million in 1999 and 1998 and $6 million
in 1997. Interest charges for these years were based on average interest rates
of approximately 6%. Interest charges of $4 million were capitalized in 1999 and
$3 million were capitalized in 1998 and 1997.


NOTE 6
SHAREHOLDER RIGHTS PLAN AND PREFERRED STOCK OF SUBSIDIARIES

   In October 1998, the Company's Board of Directors approved a share purchase
rights plan designed to assure shareholders of fair and equal treatment in the
event of a proposed takeover. The rights will be exercisable only if a person or
group acquires 15% or more of Ameren's common stock or announces a tender offer,
the consummation of which would result in ownership by a person or group of 15%
or more of the common stock. Each right will entitle the holder to purchase one
one-hundredth of a newly issued preferred stock at an exercise price of $180. If
a person or group acquires 15% or more of Ameren's outstanding common stock,
each right will entitle its holder (other than such person or members of such
group) to purchase, at the right's then-current exercise price, a number of
Ameren's common shares having a market value of twice such price. In addition,
if Ameren is acquired in a merger or other business combination transaction
after a person or group has acquired 15% or more of the Company's outstanding
common stock, each right will entitle its holder to purchase, at the right's
then-current exercise price, a number of the acquiring company's common shares
having a market value of twice such price. The acquiring person or group will
not be entitled to exercise these rights. The SEC approved the plan under PUHCA
in December 1998. The rights were issued as a dividend payable January 8, 1999,
to shareholders of record on that date; these rights expire in 2008. One right
will accompany each new share of Ameren common stock issued prior to such
expiration date.
   At December 31, 1999 and 1998, AmerenUE and AmerenCIPS had 25 million shares
and 4.6 million shares respectively, of authorized preferred stock.
   Outstanding preferred stock is entitled to cumulative dividends and is
redeemable at the prices shown in the following table:

PREFERRED STOCK OUTSTANDING NOT SUBJECT
TO MANDATORY REDEMPTION:

<TABLE>
<CAPTION>

                                          Redemption Price            December 31,
Dollars In Millions                       (per share)              1999           1998
- --------------------------------------------------------------------------------------
<S>                  <C>                <C>                     <C>           <C>
Without par value and stated
  value of $100 per share --
     $7.64 Series   -  330,000 shares     $103.82 - note(a)       $ 33          $ 33
     $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(b)         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
</TABLE>

<TABLE>
<CAPTION>


                                          Redemption Price            December 31,
Dollars In Millions                       (per share)              1999           1998
- --------------------------------------------------------------------------------------
<S>                  <C>                <C>                     <C>           <C>
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(c)         30            30
      6.625% Series -  125,000 shares      100.00                   12            12
Without par value and stated
      value of $25 per share --
      $1.735 Series - 1,657,500 shares      25.00                   42            42
                                                                  ------------------
TOTAL PREFERRED STOCK OUTSTANDING
NOT SUBJECT TO MANDATORY REDEMPTION                               $235          $235
                                                                  ==================
</TABLE>

(a) Beginning February 15, 2003, eventually declining to $100 per share.
(b) In the event of voluntary liquidation, $105.50.
(c) 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 1999 was 3.89%.


NOTE 7
SHORT-TERM BORROWINGS
    Short-term borrowings of the Company consist of bank loans (maturities
generally on an overnight basis) and commercial paper (maturities generally
within 10-45 days). At December 31, 1999 and 1998, $80 million and $59 million,
respectively, of short-term borrowings were outstanding. The weighted average
interest rates on borrowings outstanding at December 31, 1999 and 1998, were
6.3% and 4.9%, respectively.
    At December 31, 1999, the Company had committed bank lines of credit
aggregating $180 million (all of which was unused and 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. These lines of
credit are renewable annually at various dates throughout the year.
    The Company also has a $300 million, short-term, bank credit agreement due
in 2000, which permits the Company to borrow or to support a portion of the
Company's commercial paper program. At December 31, 1999, all was unused and
$240 million of such borrowing was available.
   The Company has money pool agreements among its subsidiaries to coordinate
and provide for certain short-term cash and working capital requirements.
Separate money pools are maintained between regulated and nonregulated
businesses. Interest is calculated at varying rates of interest depending on the
composition of internal and external funds in the money pools. This debt and the
related interest represent intercompany balances, which are eliminated at the
Ameren Corporation consolidated level.







<PAGE>   21


page 34  Ameren Corporation  1999 Annual Report

NOTE 8
LONG-TERM DEBT

<TABLE>
<CAPTION>

                                                   December 31,
In Millions                                     1999         1998
- ------------------------------------------------------------------
<S>                                          <C>          <C>
FIRST MORTGAGE BONDS - note(a)
   6 3/4% Series paid in 1999                   $   -        $  100
   7 1/8% Series W paid in 1999                     -            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            40
   7.40% Series due 2020 - note(b)                 60            60
   8 3/4% Series due 2021                         125           125
   8 1/4% Series due 2022                         104           104
   8% Series due 2022                              85            85
   7.15% Series due 2023                           75            75
   7% Series due 2024                             100           100
   6.125% Series due 2028                          60            60
   5.45% Series due 2028 - note(b)                 44            44
  Other 5.375% - 7.05% due 2000 through 2008      158           168
                                                -------------------
                                                1,537         1,697
                                                -------------------
</TABLE>

ENVIRONMENTAL IMPROVEMENT/POLLUTION CONTROL REVENUE BONDS

<TABLE>

<S>                                            <C>          <C>
   1985 Series A due 2015 - note(c)               70            70
   1985 Series B due 2015 - note(c)               57            57
   1990 Series B 7.60% due 2013                   32            32
   1991 Series due 2020 - note(c)                 43            43
   1992 Series due 2022 - note(c)                 47            47
   1993 Series A 6 3/8% due 2028                  35            35
   1993 Series C-1 due 2026 - note(c)             35            35
   1998 Series A due 2033 - note(c)               60            60
   1998 Series B due 2033 - note(c)               50            50
   1998 Series C due 2033 - note(c)               50            50
   Other 5.40% - 7.60% due 2014 through 2028      80            80
                                               -------------------
                                                 559           559
                                               -------------------
</TABLE>

<TABLE>

<S>                                         <C>          <C>
SUBORDINATED DEFERRABLE INTEREST DEBENTURES
   7.69% Series A due 2036 - note(d)              66            66
UNSECURED LOANS
   Commercial paper - note(e)                    152             -
   Credit agreements - note(f)                    68            10
   1991 Senior Medium Term Notes
     8.60% due through 2005                       41            47
   1994 Senior Medium Term Notes
     6.61% due through 2005                       46            54
                                             ---------------------
                                                 307           111
                                             ---------------------
NUCLEAR FUEL LEASE                               116            66
                                             ---------------------
UNAMORTIZED DISCOUNT AND PREMIUM ON DEBT          (8)           (8)
                                             ---------------------
MATURITIES DUE WITHIN ONE YEAR                  (129)         (202)
                                             ---------------------
TOTAL LONG-TERM DEBT                         $ 2,448       $ 2,289
                                             ---------------------
</TABLE>

(a) At December 31, 1999, 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) 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 1999 are as follows:
      1985 Series A  3.21%
      1985 Series B  3.29%
      1991 Series    3.65%
      1992 Series    3.55%
      1993 Series    3.34%
      1998 Series A  3.49%
      1998 Series B  3.48%
      1998 Series C  3.46%
(d) During the terms of the debentures, the Company may, under certain
    circumstances, defer the payment of interest for up to five years.
(e) A bank credit agreement, due 2002, permits AmerenUE to borrow or to support
    commercial paper borrowings up to $300 million. Interest rates will vary
    depending on market conditions.
(f) A bank credit agreement, due 2002, 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,
    1999, the average annualized interest rate was 6.4%.

Maturities of long-term debt through 2004 are as follows:

<TABLE>
<CAPTION>

In Millions     Principal Amount
- --------------------------------
<S>                <C>
2000                 $129
2001                   45
2002                  275
2003                  160
2004                  288
</TABLE>

    Amounts for years subsequent to 2000 do not include nuclear fuel lease
payments since the amounts of such payments are not currently determinable.


NOTE 9
INCOME TAXES
    Total income tax expense for 1999 resulted in an effective tax rate of 39%
on earnings before income taxes (40% in 1998 and 38% in 1997).

Principal reasons such rates differ from the statutory federal rate:

<TABLE>
<CAPTION>

                                            1999      1998     1997
- -------------------------------------------------------------------
<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                                     (1)        -       (2)
                                          ------------------------
EFFECTIVE INCOME TAX RATE                    39%       40%      38%
                                          ------------------------
</TABLE>


Income tax expense components:

<TABLE>
<CAPTION>

In Millions                                 1999      1998     1997
- -------------------------------------------------------------------
<S>                                       <C>       <C>      <C>
TAXES CURRENTLY PAYABLE
  (PRINCIPALLY FEDERAL):
Included in operating expenses              $287      $303     $261
Included in other income -
   Miscellaneous, net                         (3)       (6)       -
                                            -----------------------
                                             284       297      261
                                            -----------------------
</TABLE>


<PAGE>   22


                                                       www.ameren.com    page 35


Income tax expense components (continued):

<TABLE>
<CAPTION>

In Millions                                   1999     1998    1997
- -------------------------------------------------------------------
<S>                                        <C>       <C>      <C>
DEFERRED TAXES (PRINCIPALLY FEDERAL):
Included in operating expenses -
   Depreciation differences                     3      (10)     (11)
   Other                                      (23)     (17)      (7)
Included in other income-
   Other                                       (2)       2       10
                                            -----------------------
                                              (22)     (25)      (8)
                                            -----------------------

DEFERRED INVESTMENT TAX CREDIT
   AMORTIZATION:
Included in operating expenses                 (8)      (8)      (9)
                                            -----------------------
TOTAL INCOME TAX EXPENSE                     $254     $264     $244
                                            -----------------------
</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.
    Temporary differences gave rise to the following deferred tax assets and
deferred tax liabilities at December 31:

<TABLE>
<CAPTION>

In Millions                                           1999         1998
- --------------------------------------------------------------------------------
<S>                                               <C>          <C>
NET ACCUMULATED DEFERRED INCOME TAX LIABILITIES:
   Depreciation                                     $1,038       $1,036
   Regulatory assets, net                              433          433
   Capitalized taxes and expenses                      130          155
   Deferred benefit costs                              (58)         (48)
   Other                                                21           12
                                                    -------------------
TOTAL NET ACCUMULATED DEFERRED
   INCOME TAX LIABILITIES                           $1,564       $1,588
                                                    -------------------
</TABLE>

NOTE 10
RETIREMENT BENEFITS
    The Company has a defined-benefit retirement plan covering substantially all
of its employees. Benefits are based on the employees' years of service and
compensation. The Company's plan is funded in compliance with income tax
regulations and federal funding requirements.
    On January 1, 1999, the AmerenUE and the AmerenCIPS pension plans combined
to form the Ameren Retirement Plan. The AmerenUE and AmerenCIPS pension plans'
information for 1998 and 1997 is presented separately. The Ameren plan covers
qualified employees of the Company. Following is the pension plan information
related to Ameren's plan as of December 31, 1999:
    Pension costs for 1999 were $24 million, of which approximately 18% was
charged to construction accounts.

FUNDED STATUS OF AMEREN'S PENSION PLAN:

<TABLE>
<CAPTION>

In Millions                                            1999
- -----------------------------------------------------------
<S>                                                <C>
CHANGE IN BENEFIT OBLIGATION
Net benefit obligation at beginning of year          $1,321
  Service cost                                           33
  Interest cost                                          91
  Actuarial gain                                        (95)
  Benefits paid                                         (93)
                                                     ------
Net benefit obligation at end of year                 1,257
                                                     ------
CHANGE IN PLAN ASSETS*
Fair value of plan assets at beginning of year        1,372
  Actual return on plan assets                          146
  Employer contributions                                  2
  Benefits paid                                         (93)
                                                     ------
Fair value of plan assets at end of year              1,427
                                                     ------
Funded status - excess                                 (170)
Unrecognized net actuarial gain                         310
Unrecognized prior service cost                         (62)
Unrecognized net transition asset                         7
                                                     ------
ACCRUED PENSION COST AT DECEMBER 31                  $   85
                                                     ======
</TABLE>

* Plan assets consist principally of common stocks and fixed income securities.

COMPONENTS OF AMEREN'S NET PERIODIC BENEFIT COST:

<TABLE>
<CAPTION>

In Millions                                           1999
- ----------------------------------------------------------
<S>                                                <C>
Service cost                                         $  33
Interest cost                                           91
Expected return on plan assets                        (104)
Amortization of:
   Transition asset                                     (1)
  Prior service cost                                     7
  Actuarial gain                                        (2)
                                                     -----
NET PERIODIC BENEFIT COST                            $  24
                                                     =====
</TABLE>

WEIGHTED-AVERAGE ASSUMPTIONS FOR ACTUARIAL
PRESENT VALUE OF PROJECTED BENEFIT OBLIGATIONS:

<TABLE>
<CAPTION>

                                                      1999
- ----------------------------------------------------------
<S>                                                 <C>
Discount rate at measurement date                     7.75%
Expected return on plan assets                        8.50%
Increase in future compensation                       4.75%
</TABLE>

    AmerenUE's plan covers qualified employees of AmerenUE as well as certain
employees of Ameren Services Company. Following is the pension plan information
related to AmerenUE's plan as of December 31:
    Pension costs for the years 1998 and 1997, were $28 million and $24
million, respectively, of which approximately 19% and 17%, respectively, was
charged to construction accounts.


<PAGE>   23



page 36  Ameren Corporation  1999 Annual Report


FUNDED STATUS OF AMERENUE'S PENSION PLAN:

<TABLE>
<CAPTION>

In Millions                                            1998
- -----------------------------------------------------------
<S>                                                 <C>
CHANGE IN BENEFIT OBLIGATION
Net benefit obligation at beginning of year           $ 999
  Service cost                                           24
  Interest cost                                          70
  Amendments                                             10
  Actuarial loss                                         38
  Special termination benefit charge                      7
  Benefits paid                                         (88)
                                                      -----
Net benefit obligation at end of year                 1,060
                                                      -----

CHANGE IN PLAN ASSETS*
Fair value of plan assets at beginning of year        1,006
  Actual return on plan assets                          122
  Employer contributions                                  1
  Benefits paid                                         (88)
                                                      -----
Fair value of plan assets at end of year              1,041
                                                      -----

Funded status - deficiency                               19
Unrecognized net actuarial gain                         121
Unrecognized prior service cost                         (73)
Unrecognized net transition asset                         6
                                                      -----
ACCRUED PENSION COST AT DECEMBER                       $ 73
                                                      -----
</TABLE>

* Plan assets consist principally of common stocks and fixed income securities.

COMPONENTS OF AMERENUE'S NET PERIODIC BENEFIT COST:

<TABLE>
<CAPTION>

In Millions                                    1998     1997
- ------------------------------------------------------------
<S>                                          <C>      <C>
Service cost                                   $ 24     $ 22
Interest cost                                    70       69
Expected return on plan assets                  (75)     (71)
Amortization of:
  Transition asset                               (1)      (1)
  Prior service cost                              6        7
  Actuarial gain                                 (3)      (2)
Special termination benefit charge                7        -
                                               -------------
NET PERIODIC BENEFIT COST                      $ 28     $ 24
                                               =============
</TABLE>

WEIGHTED-AVERAGE ASSUMPTIONS FOR ACTUARIAL
PRESENT VALUE OF PROJECTED BENEFIT OBLIGATIONS:

<TABLE>
<CAPTION>

                                                        1998
- ------------------------------------------------------------
<S>                                                   <C>
Discount rate at measurement date                       6.75%
Expected return on plan assets                           8.5%
Increase in future compensation                            4%
</TABLE>

    AmerenCIPS' plan covers substantially all employees of AmerenCIPS as well as
certain employees of Ameren Services Company. In 1998, AmerenCIPS changed its
measurement date for valuation of plan assets and liabilities to December 31.
Following is the pension plan information related to AmerenCIPS' plan as of
December 31:
    Pension costs for the years 1998 and 1997 were $9 million and $5 million,
respectively, of which approximately 19% in 1998 and 15% in 1997 was charged to
construction accounts.

FUNDED STATUS OF AMERENCIPS' PENSION PLAN:

<TABLE>
<CAPTION>

In Millions                                            1998
- -----------------------------------------------------------
<S>                                                  <C>
CHANGE IN BENEFIT OBLIGATION
Net benefit obligation at beginning of year            $249
  Service cost                                            8
  Interest cost                                          17
  Amendments                                              5
  Actuarial loss                                          8
  Special termination benefit charge                      5
  Benefits paid                                         (31)
                                                       ----
Net benefit obligation at end of year                   261
                                                       ----

CHANGE IN PLAN ASSETS*
Fair value of plan assets at beginning of year          319
  Actual return on plan assets                           38
  Employer contributions                                  5
  Benefits paid                                         (31)
                                                       ----
Fair value of plan assets at end of year                331
                                                       ----

Funded status - excess                                  (70)
Unrecognized net actuarial gain                          73
Unrecognized prior service cost                         (13)
Unrecognized net transition asset                         2
                                                       ----
PREPAID PENSION COST AT DECEMBER 31                    $ (8)
                                                       ====
</TABLE>

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

COMPONENTS OF AMERENCIPS' NET PERIODIC BENEFIT COST:

<TABLE>
<CAPTION>

In Millions                                   1998     1997
- -----------------------------------------------------------
<S>                                        <C>      <C>
Service cost                                 $   8    $   7
Interest cost                                   17       16
Expected return on plan assets                 (22)     (19)
Amortization of prior service cost               1        1
Special termination benefit charge               5        -
                                             --------------
NET PERIODIC BENEFIT COST                    $   9    $   5
                                             --------------
</TABLE>

WEIGHTED-AVERAGE ASSUMPTIONS FOR ACTUARIAL
PRESENT VALUE OF PROJECTED BENEFIT OBLIGATIONS:

<TABLE>
<CAPTION>

                                                       1998
- -----------------------------------------------------------
<S>                                                  <C>
Discount rate at measurement date                      6.75%
Expected return on plan assets                          8.5%
Increase in future compensation                           4%
</TABLE>

    In addition to providing pension benefits, the Company provides certain
health care and life insurance benefits for retired employees. The Company
accrues the expected postretirement benefit costs during employees' years of
service.
    AmerenUE's plans cover qualified employees of AmerenUE as well as certain
employees of Ameren Services Company. 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 $46 million for 1999, $43 million in 1998 and $44 million


<PAGE>   24


                                                       www.ameren.com    page 37


in 1997, of which approximately 18% in 1999 and 17% in 1998 and 1997 were
charged to construction accounts. AmerenUE's transition obligation at December
31, 1999, is being amortized over the next 13 years.
    The MoPSC and the ICC allow the recovery of postretirement benefit costs in
rates to the extent that such costs are funded. In December 1995, AmerenUE
established two external trust funds for retiree health care and life insurance
benefits. In 1999, 1998 and 1997, claims were paid out of the plan trust funds.

FUNDED STATUS OF AMERENUE'S POSTRETIREMENT PLANS:

<TABLE>
<CAPTION>

In Millions                                           1999       1998
- ---------------------------------------------------------------------
<S>                                                <C>        <C>
CHANGE IN BENEFIT OBLIGATION
Net benefit obligation at beginning of year          $ 360      $ 333
  Service cost                                          15         14
  Interest cost                                         25         24
  Actuarial (gain)/loss                                (20)         9
  Benefits paid                                        (26)       (20)
                                                     ----------------
Net benefit obligation at end of year                  354        360
                                                     ----------------

CHANGE IN PLAN ASSETS*
Fair value of plan assets at beginning of year         110         81
  Actual return on plan assets                           4          8
  Employer contributions                                46         44
  Unincorporated business income tax                     -         (3)
  Benefits paid                                        (26)       (20)
                                                     ----------------
Fair value of plan assets at end of year               134        110
                                                     ----------------

Funded status - deficiency                             220        250
Unrecognized net actuarial gain                         29         11
Unrecognized prior service cost                         (3)        (3)
Unrecognized net transition obligation                (162)      (175)
                                                     ----------------
POSTRETIREMENT BENEFIT LIABILITY AT DECEMBER 31      $  84      $  83
                                                     ================
</TABLE>

* Plan assets consist principally of common stocks and fixed income securities.

COMPONENTS OF AMERENUE'S NET PERIODIC BENEFIT COST:

<TABLE>
<CAPTION>

In Millions                                  1999     1998    1997
- ------------------------------------------------------------------
<S>                                        <C>      <C>     <C>
Service cost                                 $ 15     $ 14    $ 12
Interest cost                                  25       24      23
Expected return on plan assets                 (6)      (5)     (2)
Amortization of:
  Transition obligation                        12       12      12
  Actuarial gain                                -       (2)     (1)
                                             ---------------------
NET PERIODIC BENEFIT COST                    $ 46     $ 43    $ 44
                                             =====================
</TABLE>

ASSUMPTIONS FOR THE OBLIGATION MEASUREMENTS:

<TABLE>
<CAPTION>

                                                     1999    1998
- -----------------------------------------------------------------
<S>                                                <C>     <C>
Discount rate at measurement date                    7.75%   6.75%
Expected return on plan assets                        8.5%    8.5%
Medical cost trend rate - initial                       -    5.75%
                        - ultimate                   5.25%   4.75%
Ultimate medical cost trend rate expected in year    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 $4 million and $31 million, respectively. A 1% decrease in the
medical cost trend rate is estimated to decrease the net periodic cost and the
accumulated postretirement benefit obligation approximately $4 million and $31
million, respectively.
    AmerenCIPS' plans cover substantially all employees of AmerenCIPS as well as
certain employees of Ameren Services Company. 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 lesser of the
net periodic cost or the amount deductible for federal income tax purposes. In
1998, AmerenCIPS changed its measurement date for valuation of plan assets and
liabilities to December 31. Postretirement benefit costs were $3 million for
1999, $6 million for 1998 and $12 million for 1997, of which approximately 10%
was charged to construction accounts in 1999, 20% in 1998, and 17% in 1997.
AmerenCIPS' transition obligation at December 31, 1999 is being amortized over
the next 13 years.
    The ICC allows the recovery of postretirement benefit costs in rates to the
extent that such costs are funded.

FUNDED STATUS OF AMERENCIPS' POSTRETIREMENT PLANS:

<TABLE>
<CAPTION>

In Millions                                            1999    1998
- -------------------------------------------------------------------
<S>                                                 <C>     <C>
CHANGE IN BENEFIT OBLIGATION
Net benefit obligation at beginning of year           $ 152   $ 140
  Service cost                                            3       3
  Interest cost                                           9      10
  Actuarial (gain)/loss                                 (22)      4
  Benefits paid                                          (4)     (5)
                                                      -------------
Net benefit obligation at end of year                   138     152
                                                      -------------

CHANGE IN PLAN ASSETS*
Fair value of plan assets at beginning of year          128     115
Actual return on plan assets                             10      16
  Employer contributions                                  1       4
  401(h) transfer                                         -      (2)
Benefits paid                                            (4)     (5)
                                                      -------------
Fair value of plan assets at end of year                135     128
                                                      -------------
Funded status - deficiency                                3      24
Unrecognized net actuarial gain                          75      58
Unrecognized net transition obligation                  (71)    (76)
                                                      -------------
POSTRETIREMENT BENEFIT LIABILITY AT DECEMBER 31       $   7   $   6
                                                      =============
</TABLE>

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

COMPONENTS OF AMERENCIPS' NET PERIODIC BENEFIT COST:

<TABLE>
<CAPTION>

In Millions                            1999     1998    1997
- ------------------------------------------------------------
<S>                                  <C>      <C>     <C>
Service cost                           $  3     $  3    $  4
Interest cost                             9       10      10
Expected return on plan assets           (9)      (8)     (5)
Amortization of:
  Transition obligation                   6        5       5
  Actuarial gain                         (6)      (4)     (2)
                                       ---------------------
 NET PERIODIC BENEFIT COST             $  3     $  6    $ 12
                                       =====================
</TABLE>

<PAGE>   25
page 38  Ameren Corporation  1999 Annual Report


ASSUMPTIONS FOR THE OBLIGATION MEASUREMENTS:

<TABLE>
<CAPTION>

                                                     1999    1998
- -----------------------------------------------------------------
<S>                                                <C>     <C>
Discount rate at measurement date                    7.75%   6.75%
Expected return on plan assets                        8.5%    8.5%
Medical cost trend rate - initial                       -    5.75%
                        - ultimate                   5.25%   4.75%
Ultimate medical cost trend rate expected in year    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 $2 million and $20 million, respectively. A 1% decrease in the
medical cost trend rate is estimated to decrease the net periodic cost and the
accumulated postretirement benefit obligation approximately $2 million and $20
million, respectively.

NOTE 11
STOCK OPTION PLANS
    In 1998, the Company adopted a long-term incentive plan (the Plan) for
eligible employees, replacing the plan previously in place at AmerenUE. The Plan
provides for the grant of options, performance awards, restricted stock,
dividend equivalents and stock appreciation rights. Under the terms of the Plan,
options may be granted at a price not less than the fair market value of 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 2009. Under the
Plan, subject to adjustment as provided in the Plan, four million shares have
been authorized to be issued or delivered under the Company's Plan. In
accordance with APB 25, no compensation cost has been recognized for the
Company's stock compensation plans. The Company has adopted the disclosure-only
method of fair value data 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 1999,
1998, and 1997 net income and earnings per share would have been immaterial.
    The following table summarizes stock option activity during 1999, 1998 and
1997:

<TABLE>
<CAPTION>

                                                  1999
                                       ----------------------
                                                     Weighted
                                                      Average
                                                     Exercise
                                         Shares        Price
- -------------------------------------------------------------
<S>                                  <C>            <C>
Outstanding at beginning of year       1,095,180      $39.41
Granted                                  768,100       36.63
Exercised                                 11,162       37.20
Cancelled or expired                      18,010       42.45
                                       ---------------------
Outstanding at end of year             1,834,108       38.22
Exercisable at end of year               391,456       39.06
                                       ---------------------
</TABLE>

<TABLE>
<CAPTION>

                                    1998               1997
                                -----------------------------------
                                         Weighted          Weighted
                                          Average           Average
                                         Exercise          Exercise
                                Shares    Price    Shares   Price
- -------------------------------------------------------------------
<S>                        <C>         <C>       <C>      <C>
Outstanding at
  beginning of year            496,070   $ 39.24   307,390  $ 39.71
Granted                        700,600     39.25   195,880    38.50
Exercised                       72,390     36.81         -        -
Cancelled or expired            29,100     39.28     7,200    39.56
                             --------------------------------------
Outstanding at end of year   1,095,180     39.41   496,070    39.24
Exercisable at end of year     173,653     39.91   134,785    38.55
                             ======================================
</TABLE>

Additional information about stock options outstanding at December 31, 1999:

<TABLE>
<CAPTION>

                                        Weighted Average
Exercise Price      Outstanding Shares     Life (Years)    Exercisable Shares
- -----------------------------------------------------------------------------
<S>                   <C>                  <C>                <C>
$ 35.50                      800                5.6                 600
  35.875                  79,225                4.8              59,375
  36.625                 768,100                8.5              60,700
  38.50                  175,853                6.0              68,701
  39.25                  662,500                7.2             111,150
  39.8125                  5,300                8.5                   -
  43.00                  142,330                4.8              90,930
=============================================================================
</TABLE>


    The fair values of stock options were estimated using a binomial
option-pricing model with the following assumptions:

<TABLE>
<CAPTION>

   Grant       Risk-free                      Expected        Expected
   Date      Interest Rate     Option Term    Volatility    Dividend Yield
- -------------------------------------------------------------------------
<S>             <C>           <C>             <C>             <C>
 2/12/99          5.44%         10 years        18.80%          6.51%
 6/16/98          5.63%         10 years        17.68%          6.55%
 4/28/98          6.01%         10 years        17.63%          6.55%
 2/10/97          5.70%         10 years        13.17%          6.53%
  2/7/96          5.87%         10 years        13.67%          6.32%
- -------------------------------------------------------------------------
</TABLE>


NOTE 12
COMMITMENTS AND CONTINGENCIES
    The Company is engaged in a capital program under which expenditures
averaging approximately $653 million, including AFC, are anticipated during each
of the next five years. This estimate includes capital expenditures for the
purchase of new combustion turbine generators, as well as expenditures that will
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 committed to purchase combustion turbine generators (CTs),
which will add more than 2,700 megawatts to its net peaking capacity and are
expected to cost approximately $1.2 billion. CTs with a total capacity of
approximately 590 megawatts are planned to be installed in 2000, 560 megawatts
in 2001, 590 megawatts in 2002, and 325 megawatts each in 2003 through 2005.
Except for nearly 200 megawatts, the new capacity is expected to be operated by
the Company's proposed new nonregulated generating subsidiary (see Note 2 -
Regulatory Matters for further information).


<PAGE>   26


                                                       www.ameren.com    page 39

    The Company has commitments for the purchase of coal under long-term
contracts. Coal contract commitments, including transportation costs, for 2000
through 2004 are estimated to total $2.1 billion. Total coal purchases,
including transportation costs, for 1999, 1998 and 1997 were $603 million, $567
million and $547 million, respectively. The Company also has existing contracts
with pipeline and natural gas suppliers to provide, transport and store natural
gas for distribution and electric generation. Gas-related contract cost
commitments for 2000 through 2004 are estimated to total $122 million. Total
delivered natural gas costs were $131 million for 1999, $119 million for 1998,
and $161 million for 1997. The Company's nuclear fuel commitments for 2000
through 2004, including uranium concentrates, conversion, enrichment and
fabrication, are expected to total $73 million, and are expected to be
substantially financed under the nuclear fuel lease. Nuclear fuel expenditures
for 1999, 1998 and 1997, were $22 million, $20 million and $35 million,
respectively. Additionally, the Company has long-term contracts with other
utilities to purchase electric capacity. These commitments for 2000 through 2004
are estimated to total $241 million. During 1999, 1998 and 1997, electric
capacity purchases were $44 million, $38 million and $36 million, respectively.
    In the fourth quarter 1999, AmerenCIPS and two of its coal suppliers
executed agreements to terminate their existing coal supply contracts, effective
December 31, 1999. Under these agreements, AmerenCIPS has made termination
payments to the suppliers totaling approximately $52 million. These termination
payments were recorded as a nonrecurring charge in the fourth quarter of 1999,
equivalent to $31 million, after income taxes, or 23 cents per share. Total
pretax fuel cost savings from these termination agreements are estimated to be
$183 million (or $131 million net of the termination payments) through 2010,
which is the maximum period that would have remained on any of the terminated
coal supply contracts. Approximately $66 million of pretax fuel cost savings is
expected to be realized over the next three years.
    During 1996, AmerenCIPS restructured its contract with one of its major coal
suppliers. In 1997, the Company paid a $70 million restructuring payment to the
supplier, which allowed it to purchase at market prices low-sulfur, non-Illinois
coal through the supplier (in substitution for the high-sulfur Illinois coal
AmerenCIPS was obligated to purchase under the original contract). Under the
1997 restructuring, the Company received 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 plant scrubber. The benefits of the 1999 restructuring
include lower cost coal, avoidance of significant capital expenditures to
renovate the scrubber, and elimination of scrubber operating and maintenance
costs (offset by scrubber retirement expenses). The net benefits of
restructuring are expected to exceed $100 million through 2007. 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 Fuel Adjustment Clause (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 $72 million of the
Restructuring Charges as a regulatory asset and, through December 1997,
recovered approximately $10 million of the Restructuring Charges through the
retail FAC and from wholesale customers. In November 1997, the ICC order was
reversed on appeal by the Illinois Third District Appellate Court. The Illinois
Supreme Court issued a final decision in December 1998 reversing the Appellate
Court's opinion and affirming the ICC's order allowing the recovery of the
Restructuring Charges through the retail FAC.
    The recoverability of the Restructuring Charges under the retail FAC in
Illinois was impacted by the Illinois Law. Among other things, the Illinois Law
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 Illinois Law on the future
recoverability of the Company's Restructuring Charges through future rates, the
Company wrote off the unamortized balance of the Illinois retail portion of its
Restructuring Charges as of December 31, 1997 ($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,
1999 was as follows:

TYPE AND SOURCE OF COVERAGE

<TABLE>
<CAPTION>


                                                    Maximum
                                                  Assessments
                                     Maximum       for Single
In Millions                          Coverages     Incidents
- --------------------------------------------------------------
<S>                                 <C>             <C>
Public Liability:
  American Nuclear Insurers           $  200          $ -
  Pool Participation                   9,338           88(a)
                                      ------------------------
                                      $9,538(b)       $88
                                      ------------------------
Nuclear Worker Liability:
  American Nuclear Insurers           $  200(c)       $ 3
                                      ------------------------
Property Damage:
  Nuclear Electric Insurance Ltd.     $2,750(d)       $11
                                      ------------------------
Replacement Power:
  Nuclear Electric Insurance Ltd.     $  490(e)       $ 2
                                      ------------------------
</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. Price-Anderson expires in 2002.
(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 12 weeks of an outage, plus $2.8 million per week for 110 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 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 Title IV of the Clean Air Act Amendments of 1990, the Company is
required to significantly reduce total annual sulfur dioxide (SO2) and nitrogen
oxide (NOx) emissions by the year 2000. By switching to low-sulfur coal, early


<PAGE>   27


page 40  Ameren Corporation  1999 Annual Report


banking of emissions credits and installing advanced NOx reduction combustion
technology, the Company is meeting these requirements.
    In July 1997, the United States Environmental Protection Agency (EPA) issued
regulations revising the National Ambient Air Quality Standards for ozone and
particulate matter. In May 1999, the U.S. Court of Appeals for the District of
Columbia remanded the regulations back to the EPA for review. Litigation
regarding appeals of these regulations is ongoing. New ambient standards may
result in additional significant reductions in SO2 and NOx emissions from the
Company's power plants by 2007. At this time, the Company is unable to predict
the ultimate impact of these revised air quality standards on its future
financial condition, results of operations or liquidity.
    In an attempt to lower ozone levels across the eastern United States, the
EPA issued the implementation of regulations in September 1998 to reduce NOx
emissions from coal-fired boilers and other sources in 22 states, including
Missouri and Illinois (where all of the Company's coal-fired power plant boilers
are located). The implementation of these regulations has been delayed by the
U.S. Court of Appeals for the District of Columbia until a legal challenge
brought by various industries and states has been resolved. The proposed
regulations mandate a 75% reduction from 1990 levels by the year 2003 and
require states to develop plans to reduce NOx emissions to help alleviate ozone
problem areas. The NOx emissions reductions already achieved on several of the
Company's coal-fired power plants will help to reduce the costs of compliance
with these regulations. However, preliminary analysis of the regulations
indicate that selective catalytic reduction technology may be required for some
of the Company's units, as well as other additional controls.
    Currently, the Company estimates that its additional capital expenditures to
comply with the final NOx regulations could range from $250 million to $300
million over the period from 1999 to 2003. Associated operations and maintenance
expenditures could increase $10 million to $15 million annually, beginning in
2003. The Company is exploring alternatives to comply with these new regulations
in order to minimize, to the extent possible, its capital costs and operating
expenses. The Company is unable to predict the ultimate impact of these
standards on its future financial condition, results of operations or liquidity.
    In November 1998, the United States signed an agreement with numerous other
countries (the Kyoto Protocol) containing certain environmental provisions,
which would require decreases in greenhouse gases in an effort to address the
"global warming" issue. The Kyoto Protocol has not been ratified by the United
States Senate. Implementation of the Kyoto Protocol in its present form would
likely result in significantly higher capital costs and operations and
maintenance expenses by the Company. At this time, the Company is unable to
determine the impact of these proposals on the Company's future financial
condition, results of operations or liquidity.
    As of December 31, 1999, the Company's utility operating subsidiaries were
designated as potentially responsible parties (PRP) by federal and state
environmental protection agencies at seven 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 former manufactured gas plant sites located in
Illinois are being accrued and deferred rather than expensed currently, pending
recovery through environmental adjustment clause rate riders approved by the
ICC. Through December 31, 1999, the total of the costs deferred, net of
recoveries from insurers and through environmental adjustment clause riders, was
$13 million.
    The ICC has instituted reconciliation proceedings to review the Company's
environmental remediation activities to determine whether the revenues collected
from customers under its environmental adjustment clause rate riders 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. Rulings from the ICC are pending with respect to these
proceedings applicable to the years 1993 through 1998. The reconciliation
proceedings relating to the Company's 1999 environmental remediation activities
will commence by the ICC in 2000.
    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 1993 lockout of both unions by AmerenCIPS. The NLRB issued
complaints against AmerenCIPS concerning its lockout. Both unions sought, among
other things, back pay and other benefits for the period of the lockout. At that
time, the Company estimated the amount of back pay and other benefits for both
unions to be approximately $17 million. In August 1998, a three-member panel of
the NLRB reversed the May 1996 decision of its administrative law judge and
ruled in favor of AmerenCIPS holding that the lockout was lawful. In April 1999,
the unions filed petitions for review with the U.S. Court of Appeals for the
District of Columbia Circuit of the NLRB's August 1998 decision. This appeal is
pending. The Company continues to believe that the lockout was both lawful and
reasonable and that the final resolution of the dispute will not have a material
adverse effect on its financial position, results of operations or liquidity.
    Certain employees of the Company are represented by the International
Brotherhood of Electrical Workers and the International Union of Operating
Engineers. These employees comprise approximately 70% of the Company's
workforce. New contracts with collective bargaining units representing
approximately 60% of these employees were ratified in 1999 with terms expiring
in 2002. Negotiations with collective bargaining units representing
approximately 38% of those union employees are currently underway. The current
collective bargaining agreements which expired in July 1999 have been extended
to facilitate those negotiations. At this time, the Company is unable to predict
the impact of these negotiations on its future financial condition, results of
operations or cash flows. The collective bargaining agreement covering the
remaining 2% of represented employees expires in 2000.
    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 the Company's 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


<PAGE>   28

www.ameren.com    page 41


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.

NOTE 13
CALLAWAY NUCLEAR PLANT
    Under the Nuclear Waste Policy Act of 1982, the Department of Energy (DOE)
is responsible for the permanent storage and disposal of spent nuclear fuel. The
DOE currently charges one mill per 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 the Callaway Plant site until 2020 and has the
capability for additional storage capacity through the licensed life of the
plant. The delayed availability of the DOE's disposal facility is not expected
to adversely affect the continued operation of the 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 $509 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 approximately
$7 million in each of the years 1999, 1998 and 1997. Every three years, the
MoPSC and ICC require 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 studies were filed in 1999. Costs
collected from customers are deposited in an external trust fund to provide for
Callaway's decommissioning. Fund earnings are expected to average approximately
9% annually through the date of decommissioning. If the assumed return on trust
assets is not earned, the Company believes it is probable that any 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 14
FAIR VALUE OF FINANCIAL INSTRUMENTS
    The following methods and assumptions were used to estimate the fair value
of each class of financial instruments for which it is practicable to estimate
that value:

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
    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.

DERIVATIVE FINANCIAL INSTRUMENTS
    Market prices used to determine fair value are based on management's
estimates, which take into consideration factors like closing exchange prices,
over-the-counter prices, time value of money and volatility factors.
    Carrying amounts and estimated fair values of the Company's financial
instruments at December 31:

<TABLE>
<CAPTION>

                                       1999                  1998
                               --------------------------------------
                               Carrying     Fair     Carrying     Fair
In Millions                     Amount      Value     Amount      Value
- -----------------------------------------------------------------------
<S>                          <C>        <C>         <C>      <C>
Marketable securities          $     -    $     -     $   14   $   14
Preferred stock                    235        192        235      235
Long-term debt
  (including current portion)    2,577      2,552      2,491    2,659
                               --------------------------------------
</TABLE>


    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 13 - 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, 1999
and 1998. In 1999, 1998 and 1997, the proceeds from the sale of investments were
$83 million, $29 million and $24 million, respectively. Using the specific
identification method to determine cost, the gross realized gains on those sales
were approximately $11 million for 1999, and $2 million for 1998 and 1997. 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:


<PAGE>   29


page 42  Ameren Corporation  1999 Annual Report

<TABLE>
<CAPTION>

                                    Gross Unrealized
1999 In Millions                    ----------------
Security Type                Cost    Gain      (Loss)  Fair Value
- -----------------------------------------------------------------
<S>                        <C>     <C>        <C>       <C>
Debt securities              $ 67    $ -        $  -      $ 67
Equity securities              45     73           -       118
Cash equivalents                2      -           -         2
                             ---------------------------------
                             $114    $73        $  -      $187
                             ---------------------------------
<CAPTION>
                                    Gross Unrealized
1998 In Millions                    ----------------
Security Type                Cost    Gain      (Loss)  Fair Value
- -----------------------------------------------------------------
<S>                        <C>     <C>        <C>       <C>
Debt securities              $ 48    $ 4        $ -       $ 52
Equity securities              46     62          -        108
Cash equivalents                2      -          -          2
                             ---------------------------------
                             $ 96    $66        $ -       $162
                             ---------------------------------
</TABLE>

The contractual maturities of investments in debt securities at December 31,
1999 were as follows:

<TABLE>
<CAPTION>

In Millions                                 Cost  Fair Value
- ------------------------------------------------------------
<S>                                       <C>      <C>
1 year to 5 years                           $ 6      $  6
5 years to 10 years                          30        30
Due after 10 years                           31        31
                                            -------------
                                            $67      $ 67
                                            -------------
</TABLE>


NOTE 15
SEGMENT INFORMATION
    In 1998, the Company adopted SFAS 131, "Disclosures about Segments of an
Enterprise and Related Information." Ameren's principal business segment is
comprised of the two regulated utility operating companies that provide electric
and gas service in portions of Missouri and Illinois. The other reportable
segment includes the nonregulated subsidiaries, as well as the Company's 60%
interest in Electric Energy, Inc.
    The accounting policies of the segments are the same as those described in
Note 1 - Summary of Significant Accounting Policies. Segment data includes
intersegment revenues, as well as a charge allocating costs of administrative
support services to each of the operating companies. These costs are accumulated
in a separate subsidiary, Ameren Services Company, which provides a variety of
support services to Ameren and its subsidiaries. The Company evaluates the
performance of its segments and allocates resources to them, based on revenues,
operating income and net income.
    The table below presents information about the reported revenues, operating
income, net income, and total assets of Ameren for the years ended December 31:

<TABLE>
<CAPTION>

                         Regulated                 Reconciling
1999 In Millions         Utilities     All Other      Items       Total
- ------------------------------------------------------------------------
<S>                     <C>            <C>         <C>          <C>
Revenues                  $ 3,455        $243        $(174)*      $3,524
Net income                    384           1            -           385
Total assets                8,825         435          (82)        9,178
                          ----------------------------------------------
</TABLE>

<TABLE>
<CAPTION>

                         Regulated                 Reconciling
1998 In Millions         Utilities     All Other      Items       Total
- ------------------------------------------------------------------------
<S>                     <C>            <C>         <C>          <C>
Revenues                  $3,230         $190        $(102)*      $3,318
Net income                   380            6            -           386
Total assets               8,594          237           16         8,847
                          ----------------------------------------------
</TABLE>


<TABLE>
<CAPTION>


1997 In Millions
- ------------------------------------------------------------------------
<S>                     <C>            <C>         <C>          <C>
Revenues                  $3,139         $243        $ (55)*      $3,327
Net income                   321           14            -           335
Total assets               8,591          243           (6)        8,828
                          ----------------------------------------------
</TABLE>

*Elimination of intercompany revenues.

Specified items included in segment profit/loss for the year ended December 31:

<TABLE>
<CAPTION>

1999 In Millions         Regulated Utilities       All Other         Total
- --------------------------------------------------------------------------
<S>                          <C>                    <C>             <C>
Interest expense               $163                   $ 9             $172
Depreciation, depletion
  and amortization expense      337                    12              349
Income tax expense              261                    (2)             259
                                ------------------------------------------
</TABLE>

<TABLE>
<CAPTION>

1998 In Millions
- --------------------------------------------------------------------------
<S>                          <C>                    <C>             <C>
Interest expense               $170                   $ 9             $179
Depreciation, depletion
 and amortization expense       334                    14              348
Income tax expense              263                     5              268
                               -------------------------------------------
</TABLE>

<TABLE>
<CAPTION>

1997 In Millions
- --------------------------------------------------------------------------
<S>                          <C>                    <C>             <C>
Interest expense               $168                   $10             $178
Depreciation, depletion
 and amortization expense       331                    15              346
Income tax expense              226                     8              234
Extraordinary items             (52)                    -              (52)
                               -------------------------------------------
</TABLE>

Specified items related to segment assets as of December 31:

<TABLE>
<CAPTION>

1999 In Millions               Regulated Utilities       All Other      Total
- -----------------------------------------------------------------------------
<S>                                  <C>                 <C>          <C>
Expenditures for additions
 to long-lived assets                  $342                $179         $521
                                       --------------------------------------
<CAPTION>

1998 In Millions
- -----------------------------------------------------------------------------
<S>                                  <C>                 <C>          <C>
Expenditures for additions
 to long-lived assets                  $290                $ 31         $321
                                       --------------------------------------
<CAPTION>

1997 In Millions
- -----------------------------------------------------------------------------
<S>                                  <C>                 <C>          <C>
Expenditures for additions
 to long-lived assets                  $375                $ 6          $381
                                       --------------------------------------
</TABLE>


<PAGE>   30


                                                       www.ameren.com    page 43


SELECTED CONSOLIDATED FINANCIAL INFORMATION


<TABLE>
<CAPTION>

Millions of Dollars
Except Share and Per Share Amounts and Ratios          1999          1998          1997           1996          1995         1994
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                <C>          <C>           <C>            <C>           <C>          <C>
RESULTS OF OPERATIONS Year ended December 31,
         Operating revenues                              $3,524       $3,318        $3,327         $3,328        $3,236      $3,270
         Operating expenses                               2,961        2,747         2,744          2,752         2,658       2,685
         Operating income                                   563          571           582            576           578         585
         Income before extraordinary charge                 385          386           387            372           373         391
         Extraordinary charge, net of income taxes            -            -            52              -             -           -
         Net income                                         385          386           335            372           373         391
         Average common shares outstanding          137,215,462   137,215,462  137,215,462    137,215,462   137,215,462 137,253,617
                                                    --------------------------------------------------------------------------------
ASSETS, OBLIGATIONS
 AND EQUITY CAPITAL DECEMBER 31,
 Total assets                                           $9,178         $8,847       $8,828         $8,933        $8,788      $8,629
 Long-term debt obligations                              2,448          2,289        2,506          2,335         2,373       2,413
 Preferred stock subject to
   mandatory redemption                                      -              -            -              1             1           1
 Preferred stock not subject to
   mandatory redemption                                    235            235          235            298           298         298
 Common equity                                           3,090          3,056        3,019          3,016         2,971       2,917
                                                    --------------------------------------------------------------------------------

FINANCIAL INDICES Year ended December 31,
 Earnings per share of common stock
   before extraordinary charge                           $2.81          $2.82        $2.82          $2.71         $2.72       $2.85
 Extraordinary charge, net of income taxes                   -              -        $(.38)             -             -           -
 Earnings per share of common stock
   (based on average shares outstanding)                 $2.81          $2.82        $2.44          $2.71         $2.72       $2.85
 Dividend payout ratio                                      90%            90%          99%            88%           86%         80%
 Return on average common stock equity                   12.56%         12.82%       11.14%         12.51%        12.76%      13.69%
 Ratio earnings to fixed charges
   AmerenUE                                               5.64           4.99         4.70           4.68          4.78        4.68
   AmerenCIPS                                             2.98           4.13         3.64           4.30          4.41        4.93

 Book value per common share                            $22.52         $22.27       $22.00         $21.98        $21.65      $21.25
                                                    --------------------------------------------------------------------------------

CAPITALIZATION RATIOS DECEMBER 31,
  Common equity                                           53.5%          54.8%        52.4%          53.4%         52.6%       51.8%
  Preferred stock                                          4.1            4.2          4.1            5.3           5.3         5.3
  Long-term debt                                          42.4           41.0         43.5           41.3          42.1        42.9
                                                    --------------------------------------------------------------------------------
                                                         100.0%         100.0%       100.0%         100.0%        100.0%      100.0%
</TABLE>


<PAGE>   31

page 44  Ameren Corporation  1999 Annual Report

ELECTRIC OPERATING STATISTICS
<TABLE>
<CAPTION>

Year Ended December 31,                      1999          1998           1997             1996           1995           1994
- -------------------------------------------------------------------------------------------------------------------------------
<S>                                         <C>           <C>            <C>             <C>            <C>            <C>
ELECTRIC OPERATING REVENUES Millions
         Residential                        $1,097        $1,125         1,064           $1,070         $1,073         $1,014
         Commercial                            956           966           927              920            906            884
         Industrial                             50           511           500              500            496            487
         Wholesale                              90            91            91               91             87             84
         Other                                  24            23            24               28             28             22
                                         --------------------------------------------------------------------------------------
           Native                            2,672         2,716         2,606            2,609          2,590          2,491
         Interchange                           417           240           224              280            230            243
         EEI                                   177           152           207              198            201            276
         Miscellaneous                          60            29            47               22             20             20
         Credit to customers                   (38)          (43)          (20)             (47)           (33)            --
                                          -------------------------------------------------------------------------------------
TOTAL ELECTRIC OPERATING REVENUES           $3,288        $3,094        $3,064           $3,062         $3,008         $3,030
                                          -------------------------------------------------------------------------------------
KILOWATTHOUR SALES Millions
         Residential                        14,863        15,188        14,325           14,418         14,086         13,282
         Commercial                         15,418        15,555        14,990           14,872         14,464         14,043
         Industrial                         11,549        11,582        11,404           11,191         10,971         10,728
         Wholesale                           2,492         2,446         2,323            2,328          2,248          2,137
         Other                                 303           303           317              305            316            301
                                         --------------------------------------------------------------------------------------
           Native                           44,625        45,074        43,359           43,114         42,085         40,491
         Interchange                        12,881         8,075         9,402           10,768          8,176          8,080
         EEI                                 9,270         8,296        11,220           10,554         10,850         14,594
                                         --------------------------------------------------------------------------------------
TOTAL KILOWATTHOUR SALES                    66,776        61,445        63,981           64,436         61,111         63,165
                                         --------------------------------------------------------------------------------------
ELECTRIC CUSTOMERS End of Year
         Residential                     1,298,008     1,289,548     1,282,042        1,275,534      1,267,976      1,258,757
         Commercial                        188,503       181,678       180,206          176,621        173,810        171,072
         Industrial                          6,188         5,926         6,554            6,660          6,782          6,750
         Wholesale                              20            20            21               20             21             21
         Miscellaneous                       2,388         2,193         2,381            2,398          2,434          2,406
                                        --------------------------------------------------------------------------------------
TOTAL ELECTRIC CUSTOMERS                 1,495,107     1,479,365     1,471,204        1,461,233      1,451,023      1,439,006
                                        --------------------------------------------------------------------------------------
RESIDENTIAL CUSTOMER DATA Average
         Kilowatthours used                 11,827        11,986        11,215           11,354         11,152         10,606
         Annual electric bill              $859.53       $873.28       $833.34          $842.82        $849.62        $809.27
         Revenue per kilowatthour             7.27(cent)    7.29(cent)    7.38(cent)       7.30(cent)     7.62(cent)     7.63(cent)
                                       -----------------------------------------------------------------------------------------
GROSS INSTANTANEOUS PEAK DEMAND Megawatts
         AmerenUE                            8,831         8,429         8,055           8,085           7,965          7,430
         AmerenCIPS                          2,217         2,163         1,923           1,892           1,940          1,854
                                       ----------------------------------------------------------------------------------------
CAPABILITY AT TIME OF PEAK,

INCLUDING NET PURCHASES AND SALES Megawatts
         AmerenUE                            9,141         9,027         8,950           9,120           8,714          8,469
         AmerenCIPS                          2,556         2,417         2,491           2,519           2,489          2,510
                                       ----------------------------------------------------------------------------------------
GENERATING CAPABILITY AT TIME OF PEAK Megawatts
         AmerenUE                            8,352         8,282         8,279           8,244           8,184          8,057
         AmerenCIPS                          3,027         3,040         3,033           3,033           3,018          3,018
                                       ----------------------------------------------------------------------------------------
COAL BURNED Tons                        23,638,000    22,959,000    21,392,000      20,062,000      17,715,000     16,885,000
                                       ----------------------------------------------------------------------------------------
PRICE PER TON OF COAL Average               $20.34        $21.29        $23.54          $25.25          $26.86         $28.02
                                       ----------------------------------------------------------------------------------------
SOURCE OF ENERGY SUPPLY
         Coal                                 85.4%         83.5%         83.8%           79.6%           76.3%          76.2%
         Nuclear                              17.9          17.7          19.3            19.2            18.3           23.0
         Hydro                                 3.1           3.8           2.7             2.8             3.6            3.9
         Purchased and interchanged, net      (6.4)         (5.0)         (5.8)           (1.6)            1.8           (3.1)
                                        ---------------------------------------------------------------------------------------
                                             100.0%        100.0%        100.0%         100.0%           100.0%         100.0%
                                        ---------------------------------------------------------------------------------------
</TABLE>




<PAGE>   32
                                  Ameren Corporation  1999 Annual Report page 45



GAS OPERATING STATISTICS

<TABLE>
<CAPTION>
Year Ended December 31                            1999            1998          1997           1996           1995           1994
- ----------------------------------------------------------------------------------------------------------------------------------
<S>                                             <C>             <C>           <C>            <C>            <C>            <C>
NATURAL GAS OPERATING REVENUES Millions
         Residential                              $146            $135          $150           $161           $137           $138
         Commercial                                 52              50            55             61             51             53
         Industrial                                 18              19            22             21             18             24
         Off system sales                            4               3            13              -              -              -
         Miscellaneous                               8              10            10             11             11             10
                                               -----------------------------------------------------------------------------------
TOTAL NATURAL GAS OPERATING REVENUES              $228            $217          $250           $254           $217           $225
                                               ===================================================================================
MMBtu SALES Millions
         Residential                                21              21            23             27             24             23
         Commercial                                  8               8             9             11             10             10
         Industrial                                  4               6             6              5              5              6
         Off system sales                            1               1             5              -              -              -
                                               -----------------------------------------------------------------------------------
TOTAL MMBTU SALES                                   34              36            43             43             39             39
                                               ===================================================================================
NATURAL GAS CUSTOMERS End of Year
         Residential                           267,086         265,405       263,588        260,989        257,848        254,328
         Commercial                             29,247          30,245        30,147         29,911         29,446         29,037
         Industrial                                436             407           412            402            378            351
                                               -----------------------------------------------------------------------------------
TOTAL NATURAL GAS CUSTOMERS                    296,769         296,057       294,147        291,302        287,672        283,716
                                               ===================================================================================
PEAK DAY THROUGHPUT Thousands of MMBtus
         AmerenCIPS                                247             229           281            302            270            303
         AmerenUE                                  184             157           181            189            159            179
                                               -----------------------------------------------------------------------------------
TOTAL PEAK DAY THROUGHPUT                          431             386           462            491            429            482
                                               ===================================================================================
</TABLE>





<PAGE>   33




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 of
Union Electric Company and CIPSCO Incorporated on December 31, 1997.
         Common stockholders of record totaled 116,922 for Ameren at December
31, 1999. The following includes the price ranges and dividends paid per common
share for AEE during 1999 and 1998.

<TABLE>
<CAPTION>
AEE 1999
Quarter Ended         High             Low       Close          Dividends Paid
- --------------------------------------------------------------------------------
<S>                 <C>            <C>         <C>            <C>
March 31             $42 15/16 $     36 3/16    $ 36 3/16        63 1/2(cent)
June 30               40 15/16       35 13/16     38 3/8         63 1/2
September 30          40 3/4         36 7/8       37 13/16       63 1/2
December 31           39 7/8         32           32 3/4         63 1/2

AEE 1998
Quarter Ended         High             Low       Close          Dividends Paid
- --------------------------------------------------------------------------------
March 31             $43 1/8       $ 35 9/16    $42 1/8          63 1/2(cent)
June 30               42 9/16        37 5/8      39 3/4          63 1/2
September 30          42 1/4         37          41 15/16        63 1/2
December 31           44 5/16        39 1/16     42 11/16        63 1/2

- --------------------------------------------------------------------------------
</TABLE>

ANNUAL MEETING

         The annual meeting of Ameren, Union Electric Company and Central
Illinois Public Service Company stockholders will convene at 9 a.m., Tuesday,
April 25, 2000, 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 direct debit to their
           bank accounts to purchase Ameren common stock, totalling up to
           $120,000 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 Company or CIPSCO
Incorporated common stock certificates for Ameren 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 Company and Central
Illinois Public Service Company 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 standard time).
Please write or call:
Ameren Services Company
Investor Services Department
P.O. Box 66887
St. Louis, MO 63166-6887
St. Louis area 314-554-3502
Toll-free 1-800-255-2237

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

TRANSFER AGENT, REGISTRAR AND PAYING AGENT

    The Transfer Agent, Registrar and Paying Agent for Ameren Corporation Common
Stock and Union Electric Company and Central Illinois Public Service Company
Preferred Stock is Ameren Services Company.

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

OFFICE

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

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


<PAGE>   1




                                                                      Exhibit 21

                       SUBSIDIARIES OF AMEREN CORPORATION
                              AT DECEMBER 31, 1999


<TABLE>
<CAPTION>

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

    Ameren Development Company                                                          Missouri
        Ameren Energy Communications, Inc.                                              Missouri
        Ameren ERC, Inc.                                                                Missouri
            Missouri Central Railroad(1)                                                Delaware

    Ameren Energy, Inc.                                                                 Missouri
    Ameren Energy Resources Co.                                                         Illinois
    Ameren Services Company                                                             Missouri

    Central Illinois Public Service Company (CIPS)                                      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 (UE)                                                         Missouri

    Electric Energy, Inc.(2)                                                            Illinois
</TABLE>

- ----------------------
(1) Ameren ERC owns 95% of the common stock.
(2) Ameren owns 60% 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 and No. 333-50793) of
Ameren Corporation of our report dated February 2, 2000, which appears on Page
14 of Ameren Corporation's 1999 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 Statements
Schedule, which appears on Page 14 of this Form 10-K.


/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP
St. Louis, Missouri
March 30, 2000



<PAGE>   1
                                                                      EXHIBIT 24


                                POWER OF ATTORNEY

       WHEREAS, AMEREN CORPORATION, a Missouri corporation (herein referred to
as the "Company"), is required to file with the Securities and Exchange
Commission, under the provisions of the Securities Exchange Act of 1934, as
amended, its annual report on Form 10-K for the year ended December 31, 1999;
and

       WHEREAS, each of the below undersigned holds the office or offices in
the Company set opposite his or her name;

       NOW, THEREFORE, each of the undersigned hereby constitutes and appoints
Charles W. Mueller and/or Donald E. Brandt and/or Steven R. Sullivan 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 to said Form 10-K
and any amendments thereto, and, for the performance of the same acts, each with
power to appoint in their place and stead and as their 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 have hereunto set their hands this
11th day of February 2000:

<TABLE>
<S>                                                               <C>
Charles W. Mueller, Chairman, President,
       Chief Executive Officer and Director
       (Principal Executive Officer)                                     /s/ Charles W. Mueller
                                                                   ----------------------------------------------

William E. Cornelius, Director                                           /s/ William E. Cornelius
                                                                   ----------------------------------------------

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

Thomas A. Hays, Director                                                 /s/ Thomas A. Hays
                                                                   ----------------------------------------------

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

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

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

John Peters MacCarthy, Director                                          /s/ John Peters MacCarthy
                                                                   ----------------------------------------------

Hanne M. Merriman, Director
                                                                   ----------------------------------------------

Paul L. Miller, Jr., Director                                            /s/ Paul L. Miller, Jr.
                                                                   ----------------------------------------------

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

Harvey Saligman, Director                                                /s/ Harvey Saligman
                                                                   ----------------------------------------------

Janet McAfee Weakley, Director                                           /s/ Janet McAfee Weakley
                                                                   ----------------------------------------------

James W. Wogsland, Director
                                                                   ----------------------------------------------

Donald E. Brandt, Senior Vice President
       (Principal Financial Officer)                                     /s/ Donald E. Brandt
                                                                   ----------------------------------------------

Warner L. Baxter, Vice President and Controller
       (Principal Accounting Officer)                                    /s/ Warner L. Baxter
                                                                   ----------------------------------------------
</TABLE>




<PAGE>   2

                                                                      EXHIBIT 24


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

       On this 11th day of February, 2000, before me, the undersigned Notary
Public in and for said State, personally appeared the above-named officers and
directors of Ameren Corporation, known to me to be the persons described in and
who executed the foregoing power of attorney and acknowledged to me that they
executed the same as their free act and deed for the purposes therein stated.

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


                                                /s/ K. A. Bell
                                    ----------------------------------------
                                                 K. A. BELL
                                           Notary Public - Notary Seal
                                               STATE OF MISSOURI
                                               St. Louis County
                                    My Commission Expires:  October 13, 2002




<TABLE> <S> <C>

<ARTICLE> UT

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               DEC-31-1999
<BOOK-VALUE>                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                    7,165,185
<OTHER-PROPERTY-AND-INVEST>                    253,236
<TOTAL-CURRENT-ASSETS>                         879,006
<TOTAL-DEFERRED-CHARGES>                        80,737
<OTHER-ASSETS>                                 799,451
<TOTAL-ASSETS>                               9,177,615
<COMMON>                                         1,372
<CAPITAL-SURPLUS-PAID-IN>                    1,582,501
<RETAINED-EARNINGS>                          1,505,827
<TOTAL-COMMON-STOCKHOLDERS-EQ>               3,089,700
                                0
                                    235,197
<LONG-TERM-DEBT-NET>                         2,343,138
<SHORT-TERM-NOTES>                              80,165
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                       0
<LONG-TERM-DEBT-CURRENT-PORT>                  117,444
                            0
<CAPITAL-LEASE-OBLIGATIONS>                    105,310
<LEASES-CURRENT>                                11,423
<OTHER-ITEMS-CAPITAL-AND-LIAB>               3,195,238
<TOT-CAPITALIZATION-AND-LIAB>                9,177,615
<GROSS-OPERATING-REVENUE>                    3,523,631
<INCOME-TAX-EXPENSE>                           258,870
<OTHER-OPERATING-EXPENSES>                   2,702,212
<TOTAL-OPERATING-EXPENSES>                   2,961,082
<OPERATING-INCOME-LOSS>                        562,549
<OTHER-INCOME-NET>                             (3,652)
<INCOME-BEFORE-INTEREST-EXPEN>                 558,897
<TOTAL-INTEREST-EXPENSE>                       161,152
<NET-INCOME>                                   385,095
                     12,650
<EARNINGS-AVAILABLE-FOR-COMM>                  385,095
<COMMON-STOCK-DIVIDENDS>                       348,527
<TOTAL-INTEREST-ON-BONDS>                      150,408
<CASH-FLOW-OPERATIONS>                         917,575
<EPS-BASIC>                                       2.81
<EPS-DILUTED>                                     2.81


</TABLE>


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