AMEREN CORP
DEF 14A, 2000-03-15
ELECTRIC & OTHER SERVICES COMBINED
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[AMEREN LOGO]


NOTICE OF ANNUAL MEETING OF
STOCKHOLDERS AND PROXY STATEMENT OF
AMEREN CORPORATION



      Time:     9:00 A.M.
                Tuesday
                April 25, 2000


      Place:    Powell Symphony Hall
                718 North Grand Boulevard
                St. Louis, Missouri




IMPORTANT

     Admission  to the meeting  will be by ticket  only.  If you plan to attend,
please check the appropriate  box on the proxy.  Persons without tickets will be
admitted to the meeting upon verification of their stockholdings in the Company.





     Please vote,  date, sign, and return the enclosed proxy in the accompanying
reply envelope even if you own only a few shares.  If you attend the meeting and
want to  change  your  proxy  vote,  you can do so by  voting  in  person at the
meeting.


<PAGE>



AMEREN CORPORATION

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

To the Stockholders of

        AMEREN CORPORATION


     We will hold the Annual Meeting of  Stockholders  of Ameren  Corporation at
Powell  Symphony  Hall,  718 North Grand  Boulevard,  St.  Louis,  Missouri,  on
Tuesday, April 25, 2000, at 9:00 A.M., for the purposes of

      (1)electing directors of the Company for terms ending in April 2001;

      (2)considering  a  stockholder proposal  relating  to  releases  from  the
         Callaway Plant;

      (3)considering a stockholder proposal relating to cumulative voting; and

      (4)acting on other proper business presented to the meeting.

     If you owned shares of the Company's  Common Stock at the close of business
on March 6, 2000, you are entitled to vote at the meeting and at any adjournment
thereof.

     To assure that your shares are  represented  at this meeting,  please vote,
date, sign, and return the enclosed proxy in the enclosed  envelope.  The prompt
return of your proxy will reduce expenses.

By order of the Chairman and the Board of Directors.



                                    STEVEN R. SULLIVAN
                                    Secretary



St. Louis, Missouri
March 16, 2000

<PAGE>


PROXY STATEMENT OF AMEREN CORPORATION
(First sent or given to stockholders March 16, 2000)

Principal Executive Offices:
One Ameren Plaza
1901 Chouteau Avenue, St. Louis, MO 63103

     The  enclosed  proxy is  solicited  by the  Board of  Directors  of  Ameren
Corporation  (the  "Company"  or  "Ameren")  for use at the  Annual  Meeting  of
Stockholders  of the Company to be held on Tuesday,  April 25, 2000,  and at any
adjournment thereof.

     As a result of a merger  effective  December 31, 1997 (the  "Merger"),  the
Company is a holding  company,  the  principal  subsidiaries  of which are Union
Electric  Company,  d/b/a AmerenUE ("Union  Electric"),  Central Illinois Public
Service Company, d/b/a AmerenCIPS ("CIPS"), and Ameren Services Company.


                                     VOTING

     The  accompanying  proxy  represents  all shares  registered in the name(s)
shown thereon,  including shares in the Company's  DRPlus Plan.  Participants in
the Ameren  Corporation  Savings  Investment Plans will receive separate proxies
for shares in such plans.

     Only  stockholders  of record at the close of business on the Record  Date,
March 6, 2000, are entitled to vote at the meeting. The voting securities of the
Company on such date consisted of 137,215,462  shares of Common Stock.  In order
to conduct the meeting,  a majority of the  outstanding  shares entitled to vote
must be represented.

     A proxy can be revoked by delivering either a written revocation or a
signed proxy  bearing a later date to the  Secretary of the Company or by voting
in person at the meeting.

     Returned  proxies  which are  properly  marked and signed  will be voted as
directed.  If you sign the proxy but do not make specific  choices,  your shares
will be  voted  as  recommended  by the  Board - FOR the  Board's  nominees  for
Director;  AGAINST Item 2; and AGAINST Item 3. On any other  matters,  the named
proxies will use their discretion.

     In  determining  whether  a  quorum  is  present  at  the  meeting,  shares
registered  in the name of a broker  or other  nominee,  which  are voted on any
matter, will be included. In tabulating the number of votes cast,

                                      -1-

<PAGE>

withheld  votes,  abstentions,  and  non-votes  by  banks  and  brokers  are not
included.

     The  Board of  Directors  has  adopted a  confidential  voting  policy  for
proxies.


                             ITEMS TO BE CONSIDERED

Item (1):  Election of Directors

     Fourteen  directors  are to be elected at the  meeting,  to serve until the
next annual meeting of stockholders  and until their  successors are elected and
qualified.  The nominees  designated  by the Board of Directors are listed below
with information about their principal occupations and backgrounds.

WILLIAM E. CORNELIUS

Retired Chairman of the Board of Directors and Chief Executive  Officer of Union
Electric.  Mr. Cornelius joined Union Electric in 1962, held several  management
positions,  and became President in 1980. In 1988 he was elected Chairman of the
Board and served in that capacity  until his  retirement in 1994. He is a member
of the  Executive  and  Contributions  Committees  of the  Board  of  Directors.
Director of the Company since 1997. Other directorships: GenAmerica Corporation.
Age: 68.

CLIFFORD L. GREENWALT

Retired Vice Chairman of the Company and retired  President and Chief  Executive
Officer of CIPSCO  Incorporated and CIPS. Mr. Greenwalt joined CIPS in 1963, was
elected a senior vice  president  in 1980,  and was named  President  and CEO in
1989. Mr. Greenwalt is a member of the Executive and Contributions Committees of
the Board.  Director of the Company since 1997.  Other  directorships:  National
City  Corporation and its subsidiary,  National City Bank of  Michigan/Illinois.
Age: 67.

THOMAS A. HAYS

Retired  Deputy  Chairman of The May  Department  Stores  Company,  a nationwide
retailing organization.  Mr. Hays joined the May organization in 1969. He served
as Vice  Chairman  from 1982 to 1985 and  President  from 1985 to 1993,  when he
became Deputy  Chairman.  He is a member of the  Executive  and Human  Resources
Committees of the Board. Director of

                                      -2-

<PAGE>


the  Company  since 1997.  Other  directorships:  Leggett & Platt  Incorporated;
Payless Shoe Source, Inc. Age: 67.

RICHARD A. LIDDY

Chairman,  President,  and Chief  Executive  Officer of GenAmerica  Corporation,
which provides life, health, pension, annuity and related insurance products and
services.  Mr.  Liddy  joined  GenAmerica  Corporation  as  President  and Chief
Operating  Officer in 1988 and was elected to his present  position in 1995. Mr.
Liddy is a member  of the  Auditing  Committee  of the  Board.  Director  of the
Company  since 1997.  Other  directorships:  Brown Group  Inc.;  Ralston  Purina
Company; certain subsidiaries of GenAmerica Corporation. Age: 64.

GORDON R. LOHMAN

Retired Chairman and Chief Executive Officer of AMSTED Industries  Incorporated,
Chicago,  Illinois,  a  manufacturer  of  railroad,  construction,  and  general
industrial  products.  Mr. Lohman was elected  President of AMSTED Industries in
1988 and became Chief Executive Officer in 1990 and Chairman in 1997. Mr. Lohman
is a member of the  Executive  and Human  Resources  Committees  of the Board of
Directors.  Director of the Company  since 1997.  Other  directorships:  Fortune
Brands, Inc. Age: 65.

RICHARD A. LUMPKIN

Chairman,  President  and  Chief  Executive  Officer  of  Illinois  Consolidated
Telephone  Company,  Mattoon,  Illinois,  Vice  Chairman of  McLeodUSA  Inc. and
Chairman of  Illuminet  Holdings,  Inc.  Mr.  Lumpkin was elected  Treasurer  of
Illinois Consolidated  Telephone in 1968 and President in 1977, and was named to
his present position in 1990. As the result of a September 1997 merger,  he also
serves as Vice Chairman of McLeodUSA.  He is a member of the Auditing  Committee
of  the  Board.  Director  of  the  Company  since  1997.  Other  directorships:
McLeodUSA; First Mid-Illinois Bancshares, Inc.; First Mid-Illinois Bank & Trust;
Illuminet Holdings, Inc. Age: 65.

JOHN PETERS MacCARTHY

Retired Chairman and Chief Executive  Officer of Boatmen's Trust Company,  which
conducted a general trust  business.  Prior to being elected to such position in
1988, he served as President and Chief Executive  Officer of Centerre Bank, N.A.
He is Chairman of the Human Resources and Nominating Committees of the Board and
is a member of the  Executive  Committee.  Director of the  Company  since 1997.
Other directorships: Brown Shoe Company. Age: 66.

                                      -3-

<PAGE>


HANNE M. MERRIMAN

Principal  in Hanne  Merriman  Associates,  Washington,  D.C.,  retail  business
consultants.  Ms.  Merriman  is a member  of the  Contributions  and  Nominating
Committees   of  the  Board.   Director  of  the  Company   since  1997.   Other
directorships: Ann Taylor Stores Corporation; US Airways Group, Inc.; State Farm
Mutual Automobile  Insurance Co.; The Rouse Company; T. Rowe Price Mutual Funds;
Finlay Enterprises, Inc. Age: 58.

PAUL L. MILLER, JR.

President and Chief Executive Officer of P. L. Miller & Associates, a management
consultant  firm which  specializes  in  strategic  and  financial  planning for
privately held companies and distressed businesses and in international business
development.  He is also a principal in a financial  advisory  firm for small to
middle market companies.  Mr. Miller has served as president of an international
subsidiary of an investment banking firm, and for over 20 years was president of
consumer product  manufacturing  and  distribution  firms. He is a member of the
Auditing Committee of the Board. Director of the Company since 1997. Age: 57.

CHARLES W. MUELLER

Chairman, President and Chief Executive Officer of the Company and President and
Chief  Executive  Officer of Union  Electric and Ameren  Services  Company.  Mr.
Mueller  began his career  with Union  Electric in 1961 as an  engineer.  He was
named  Treasurer  in  1978,  Vice   President-Finance   in  1983,   Senior  Vice
President-Administrative Services in 1988; President in 1993 and Chief Executive
Officer in 1994. Mr. Mueller was elected  Chairman of Ameren and Ameren Services
Company  upon the  Merger.  He is a member of the  Executive  and  Contributions
Committees  of the Board.  Director of the Company  since 1997.  Mr.  Mueller is
Deputy Chairman of the Federal Reserve Bank of St. Louis.  Other  directorships:
Union Electric (since 1993); CIPS (since 1997); Angelica Corporation. Age: 61.

ROBERT H. QUENON

Retired Chairman of Peabody Holding  Company,  Inc., which is engaged in mining,
marketing and transportation of coal. Mr. Quenon was elected President and Chief
Executive  Officer  of  Peabody  Coal in 1978.  From  1983 to 1990 he  served as
President  and Chief  Executive  Officer of Peabody  Holding and was Chairman of
that firm from 1990 until his retirement in August 1991. Mr. Quenon was Chairman
of the Federal  Reserve Bank of St.  Louis from 1993 to 1995.  He is a member of
the Human  Resources and  Nominating  Committees  of the Board.  Director of the

                                      -4-

<PAGE>


Company since 1997. Other  directorships:  Newmont Mining  Corporation;  Laclede
Steel Company. Age: 71.

HARVEY SALIGMAN

Retired   Managing  Partner  of  Cynwyd   Investments,   a  family  real  estate
partnership.  Mr.  Saligman also served in various  executive  capacities in the
consumer  products  industry  for more  than 25  years.  He is  Chairman  of the
Auditing Committee of the Board. Director of the Company since 1997. Age: 61.

JANET McAFEE WEAKLEY

President  of Janet McAfee Inc., a  residential  real estate  company  which she
founded in 1975.  She is a member of the  Auditing,  Executive,  and  Nominating
Committees and is Chairman of the Contributions Committee of the Board. Director
of the Company since 1997. Other directorships: Barnes-Jewish Hospital. Age: 70.

JAMES W. WOGSLAND

Retired Vice Chairman of Caterpillar,  Inc. Mr.  Wogsland was elected  Executive
Vice  President and director of  Caterpillar in 1987. He served as Vice Chairman
and director from 1990 until his retirement in 1995. Mr. Wogsland is a member of
the Auditing  Committee of the Board.  Director of the Company since 1997.  Age:
68.

     The  fourteen  nominees  for  director  who  receive the most votes will be
elected.

     The Board of Directors  knows of no reason why any nominee will not be able
to serve as a director.  If, at the time of the Annual  Meeting,  any nominee is
unable or declines to serve,  the proxies may be voted for a substitute  nominee
approved by the Board.

     During 1999,  the Board of Directors  met six times.  Except for Mr. Liddy,
all  nominees  attended at least 75% of the  meetings of the Board and the Board
Committees of which they were members,  and aggregate attendance of the nominees
as a group exceeded 90%.

     Age  Policy -  Directors  who  attain age 72 prior to the date of an annual
meeting  cannot be  designated  as a nominee for  election at such  meeting.  In
addition,  the  eligibility  of former  employees,  except  for one who has been
elected Chief Executive Office of Ameren,  Union Electric or CIPS, is limited to
the date upon which they  retire,  resign or otherwise  sever active  employment
with the respective company.

                                      -5-

<PAGE>


     Board   Committees  -  The  Board  of  Directors  has  standing   Auditing,
Contributions, Executive, Human Resources and Nominating Committees, the members
of which are identified in the biographies above. The Auditing,  Human Resources
and Nominating Committees are comprised entirely of outside directors.

     The general  functions of the Auditing  Committee  include:  (1) reviewing,
with management and the independent  accountants,  the adequacy of the Company's
system of internal accounting  controls;  (2) reviewing the scope and results of
the  annual   examination  and  other  services  performed  by  the  independent
accountants;  (3)  recommending  to the Board  the  appointment  of  independent
accountants and approving fees for the services they perform;  and (4) reviewing
the  scope  of  audits  and  annual  budget  of  the  Company's  internal  audit
department. The Auditing Committee held three meetings in 1999.

     The Contributions Committee makes policies and recommendations with respect
to charitable  and other  contributions.  The  Contributions  Committee held one
meeting in 1999.

     The Executive Committee has such duties as may be delegated to it from time
to time by the Board. The Executive Committee did not meet in 1999.

     The Human Resources  Committee  considers the  qualifications  of executive
personnel  and  recommends  changes  therein,  considers  or  recommends  salary
adjustments  for certain  employees and  considers and acts on important  policy
matters affecting  Company  personnel.  The Human Resources  Committee held five
meetings in 1999.

     The  Nominating  Committee  considers  and  recommends  for Board  approval
candidates  for the Board of Directors,  as  recommended  by  management,  other
members of the Board,  stockholders and other interested parties. The Nominating
Committee held one meeting in 1999.

     Directors' Compensation - Directors who are employees of the Company do not
receive compensation for their services as a director.

     Each  director  who is not an employee  of the  Company  receives an annual
retainer of $20,000, an annual award of 400 shares of the Company's Common Stock
(increased  from 300 shares  effective  January 1, 2000) and a fee of $1,000 for
each Board meeting and each Board Committee meeting attended.

                                      -6-

<PAGE>


     An optional  deferred  compensation  plan  available to  directors  permits
non-employee directors to defer all or part of their annual retainer and meeting
fees.  Deferred  amounts,  plus an interest  factor,  are used to provide payout
distributions  following completion of Board service and certain death benefits.
Costs of the deferred compensation plan are expected to be recovered through the
purchase of life insurance on the participants, with the Company being the owner
and beneficiary of the insurance policies.

Item (2):  Stockholder Proposal Relating to Releases from the Callaway Plant

     Proponents of the stockholder proposal described below notified the Company
of their intention to attend the 2000 Annual Meeting to present the proposal for
consideration  and action.  The names and  addresses of the  proponents  and the
number of shares they hold will be  furnished  by the  Secretary  of the Company
upon receipt of any oral or written request for such information.

WHEREAS: Nuclear power plants,  including  Callaway,  during routine  operation,
     release into the air and water radioactive wastes which we believe increase
     the risk of life-shortening illnesses, genetic mutations, and environmental
     damage;
Though the federal government's "permissible"  concentration levels govern these
     releases,   we  believe  "permissible"  does  not  mean  safe,  but  merely
     expedient;
AmerenUE extracts Missouri River water for Callaway's cooling systems,  and some
     of that water becomes radioactively contaminated;
Some wastewater streams  contaminated with  concentrations of radioactivity that
     exceed  permissible  federal release  standards are placed in storage tanks
     until some of the shorter-lived isotopes can decay; some wastewater streams
     are re-filtered before being recycled (within the plant) or are released to
     the river;  some  wastewater  streams  are merely  pumped  into other waste
     processing  tanks to be diluted with cleaner water before  discharge to the
     river.   Instruments  monitoring  the  flow  of  wastewater  batches  after
     discharge  are set  only  to  detect  gamma-emitting  isotopes;  some  beta
     emitters  (including  tritium and noble  gases) and alpha  emitters  can be
     released without detection.  Unfiltered,  accidental leaks and releases can
     also occur through the established liquid effluent pathways;
One  contaminant - tritium,  a radioactive  isotope of hydrogen - accumulates in
     the cooling water as a fission and activation product;

Since no economically feasible  technology exists to filter tritium from cooling
     water effluents, it is released in gaseous emissions to the

                                      -7-

<PAGE>


     atmosphere  and in  liquid  releases  into  the  Missouri  River - 79 miles
     upstream from St. Louis County's drinking water intake;
The  medical profession typically  decontaminates a lab table for spills of even
     90 trillionths (per four-inch square) of one curie of radioactivity. During
     Callaway's operation in 1998, the Company reported releasing 1,394.1 curies
     of  tritium in 238  batches of  filtered  radioactive  wastewater  into the
     Missouri  River.  The  company  also  reported  releasing  tritium  to  the
     atmosphere.
Tritium can be ingested or inhaled, potentially causing reproductive,  cellular,
     and genetic damage. Its half-life is 12.3 years;
Because tritium  and the other  radioactive  isotopes  routinely  released  from
     Callaway will continue emitting  radiation  particles and rays for at least
     ten  half-lives,  the impacts of the Callaway  liquid  wastes on the water,
     algae, fish and other creatures  (including  humans) living downwind can be
     persistent.

RESOLVED:  shareholders request that Ameren describe, in its next annual report,
its efforts to reduce the release of radioactive  materials to the air and water
during Callaway's routine operation.

SUPPORTING STATEMENT

Radioactive releases occur during Callaway's routine operation.  We believe that
the  impact of these  planned  radiation  releases,  no  matter  how  small,  is
cumulative,  irreversible, and potentially dangerous. In addition, the threat of
disastrous accidental releases remains.  Ameren should take responsibility for a
more complete accounting of all radiation releases,  so that the Company and its
shareholders can more accurately assess the plant's impact on the biosphere.


YOUR BOARD OF DIRECTORS RECOMMENDS A VOTE AGAINST ITEM (2).

     On-going  measurements  at Callaway  consistently  show that plant effluent
releases are less than one percent of the levels allowed by current regulations.
This  low  level  of  effluent  releases  clearly   demonstrates  the  Company's
successful  commitment to reduce the level of radioactive material released from
the Callaway Plant.  Because  effluent  releases at Callaway are already a small
fraction of allowable  standards,  additional  reporting or  expenditures by the
Company would have minimal  impact,  and the Board  therefore  recommends a vote
AGAINST ITEM (2).

      Passage of the proposal requires the affirmative vote of a majority of the
votes cast.

                                      -8-

<PAGE>


Item (3):  Stockholder Proposal Relating to Cumulative Voting

     The proponent of the  stockholder  proposal  described  below  notified the
Company of its  intention  to attend  the 2000  Annual  Meeting  to present  the
proposal for consideration and action. The name and address of the proponent and
the number of shares it holds will be furnished by the  Secretary of the Company
upon receipt of any oral or written request for such information.

     BE  IT  RESOLVED:  That  the  stockholders  of  Ameren  Corp.  ("Company"),
assembled  in annual  meeting in person and by proxy,  hereby  request  that the
Board of Directors take the steps necessary to provide for Cumulative  Voting in
the election of directors,  which means each stockholder shall be entitled to as
many votes as shall equal the number of shares he or she owns, multiplied by the
number of directors to be elected,  and he or she may cast all of such votes for
a single candidate, or any two or more candidates as he or she may see fit.

SUPPORTING STATEMENT

     Cumulative  voting is one of the few ways stockholders can attempt to elect
members who they believe represent their views.

     Cumulative voting maximizes a stockholder's voting power by allowing him or
her to concentrate  votes for a single  nominee or combination of nominees.  For
example,  Ameren Corp. has a De-classified  Board, which means that all fourteen
directors are stand for election at the same time.  Without  Cumulative  Voting,
the owners of 14.3% of the  company's  stock do not have a  realistic  chance of
electing  a  director.  They  would  only be able to cast  their  14.3% for each
nominee.  However,  with  Cumulative  Voting,  those  same  owners  would have a
realistic  chance  to elect a nominee  by  lumping  all of their  votes for that
nominee.

     Even if dissident  stockholders do not have enough votes to elect nominees,
cumulative  voting  ensures that  management  and the Board will consider  their
views.

We urge you to vote FOR this proposal.


YOUR BOARD OF DIRECTORS RECOMMENDS A VOTE AGAINST ITEM (3).

                                      -9-

<PAGE>


     The Board believes that the adoption of cumulative  voting would reduce the
effectiveness  of Ameren's  Board of Directors and would be  detrimental  to the
best interest of the Company and its shareholders.  The Company's directors have
always been chosen for their accomplishment, commitment, integrity and diversity
of background  and  experience  and share the common  objective of advancing the
best  interests  of all  shareholders,  not a special  interest or a  particular
constituency.

     Cumulative  voting has the  appearance  of fairness,  but in reality  would
benefit special interest groups. Cumulative voting could permit a shareholder or
group of shareholders  owning  substantially less than a majority of a company's
stock to elect a director  to  advance a group's  narrow  interests.  This could
alter the  proper  balance,  diversity  and  independence  of the  Board,  would
introduce the likelihood of factionalism  and discord within the Board,  and may
undermine its ability to work  effectively  on behalf of the interests of all of
the shareholders.

     Factionalism and discord within the Board would inhibit its discussions and
decision-making,   shifting  the  Board's  attention  away  from  the  Company's
strategic  plans to the director's  single  interest  agenda.  The proponent has
given no  reason,  and the Board of  Directors  knows of none,  why the  present
method of voting should not continue to work as successfully in the future as it
has in the past. Accordingly, the Board recommends a vote AGAINST ITEM (3).

     Passage of the proposal  requires the affirmative vote of a majority of the
votes cast.

Item (4):  Other Matters

     The Board of Directors does not know of any matter, other than the election
of directors and the  proposals  set forth above,  which may be presented to the
meeting.

                               SECURITY OWNERSHIP

     Based on an  Amendment  to  Schedule  13G  filed  with the  Securities  and
Exchange  Commission  on February 10,  2000,  Capital  Research  and  Management
Company,  333  South  Hope  Street,  Los  Angeles,  California  90071,  had sole
dispositive  power over 11,382,800  shares of the Company's  Common Stock and no
voting  power with  respect to any such  shares.  Pursuant to Rule  13d-4,  such
Company  disclaimed  beneficial  ownership of the reported shares.  The reported
shares  represent  approximately  8.3% of the  outstanding  Common  Stock of the
Company.

                                      -10-

<PAGE>


                        SECURITY OWNERSHIP OF MANAGEMENT

<TABLE>
<CAPTION>


                                                        Shares of Common Stock
                                                             of the Company
                                                        Beneficially Owned<F1><F2>
            Name                                         as of February 1, 2000
            ----                                        ------------------------
       <S>                                                      <C>
       Paul A. Agathen                                          15,043
       Donald E. Brandt                                         14,580
       William E. Cornelius                                     11,688
       Clifford L. Greenwalt                                    15,906
       Thomas A. Hays                                            9,738
       Richard A. Liddy                                          3,136
       Gordon R. Lohman                                          1,269
       Richard A. Lumpkin                                        3,270
       John Peters MacCarthy                                     9,638
       Hanne M. Merriman                                         3,165
       Paul L. Miller, Jr.                                       2,775
       Charles W. Mueller                                       45,054
       Robert H. Quenon                                          3,682
       Gary L. Rainwater                                         4,416
       Garry L. Randolph                                         7,346
       Harvey Saligman                                           3,638
       Janet McAfee Weakley                                      4,282
       James W. Wogsland                                         2,093

       All Directors and executive officers as a group         264,453

<FN>

     <F1> Includes shares held jointly.  Also includes shares issuable within 60
          days upon the  exercise  of stock  options as  follows:  Mr.  Agathen,
          10,575;  Mr. Brandt,  13,200;  Mr. Mueller,  36,175; and Mr. Randolph,
          5,150. Reported shares include those for which a director, nominee for
          director or executive  officer has voting or investment  power because
          of joint or fiduciary  ownership of the shares or a relationship  with
          the record  owner,  most  commonly a spouse,  even if such  nominee or
          executive officer does not claim beneficial ownership.

     <F2> Shares beneficially owned by all directors,  nominees for director and
          executive  officers in the  aggregate do not exceed one percent of any
          class of equity securities outstanding.

</FN>

</TABLE>

                             EXECUTIVE COMPENSATION

Ameren Corporation Human Resources Committee Report on Executive Compensation

     Ameren  Corporation  and its  subsidiaries'  (collectively  referred  to as
"Ameren") goal for executive  compensation  is to approximate  the median of the
range  of  compensation  paid  by  similar  companies.  Accordingly,  the  Human
Resources Committee of the Board of Directors of Ameren

                                      -11-

<PAGE>


Corporation, which is comprised entirely of non-employee directors, makes annual
reviews of the  compensation  paid to the  executive  officers  of  Ameren.  The
Committee's  compensation  decisions  with  respect  to the  five  highest  paid
officers of Ameren  Corporation  and its principal  subsidiaries  are subject to
approval by such company's Board of Directors. Following the annual reviews, the
Committee  authorizes  appropriate  changes  as  determined  by the three  basic
components of the executive compensation program, which are:

o        Base salary,

o        A performance-based short-term incentive plan, and

o        Long-term stock-based awards.

     First,  in evaluating  and setting base  salaries for  executive  officers,
including  the  Chief   Executive   Officers  of  Ameren   Corporation  and  its
subsidiaries,  the Committee considers:  individual responsibilities,  including
changes which may have occurred since the prior review;  individual  performance
in  fulfilling   responsibilities,   including  the  degree  of  competence  and
initiative exhibited;  relative  contribution to the results of operations;  the
impact of  operating  conditions;  the  effect  of  economic  changes  on salary
structure;  and comparisons with  compensation paid by similar  companies.  Such
considerations are subjective,  and specific measures are not used in the review
process.

     The  second   component  of  the  executive   compensation   program  is  a
performance-based  Executive  Incentive  Compensation  Plan  established  by the
Ameren Corporation Board, which provides specific,  direct relationships between
corporate results and Plan compensation.  For 1999, Ameren consolidated year-end
earnings  per  share  (EPS)  target  levels  were  set  by the  Human  Resources
Committee.  If EPS  reaches at least the minimum  target  level,  the  Committee
authorizes  incentive  payments  within  prescribed  ranges based on  individual
performance  and  degree of  responsibility.  If EPS fails to reach the  minimum
target level, no payments are made. Under the Plan, it is expected that payments
to the Chief Executive  Officers of Ameren Corporation and its subsidiaries will
range from 0-37% of base salary.  For 1999, actual payments ranged from 28.5% to
35.5% of base salary.

     The third  component  of the 1999  executive  compensation  program  is the
Long-Term  Incentive Plan of 1998, which also ties  compensation to performance.
The Plan was  approved  by Ameren  Corporation  shareholders  at its 1998 Annual
Meeting  and  provides  for the  grant of  options,  performance  awards,  stock
appreciation rights and other awards. The Human Resources  Committee  determines
who participates

                                      -12-

<PAGE>


in the Plan and the  number  and types of  awards  to be made.  It also sets the
terms,  conditions,  performance requirements and limitations applicable to each
award  under the  Plan.  Awards  under  the 1998  Plan have been at levels  that
approximate the median of the range of awards granted by similar companies.

     In  determining  the  reported  1999  compensation  of the Chief  Executive
Officers,  as well as compensation for the other executive  officers,  the Human
Resources Committee considered and applied the factors discussed above. Further,
the reported  compensation  reflects an  above-average  level of  achievement in
attaining 1999 EPS. Authorized compensation for the Company's executive officers
fell within the ranges of those paid by similar companies.


                                      /s/ John Peters MacCarthy, Chairman
                                      /s/ Thomas A. Hays
                                      /s/ Gordon R. Lohman
                                      /s/ Robert H. Quenon


Compensation Tables

     The following  tables  contain  compensation  information,  for the periods
indicated,  for (a) the Chairman,  President and Chief Executive  Officer of the
Company and (b) the four other most highly compensated executive officers of the
Company who were serving as executive officers at the end of 1999.

                                      -13-

<PAGE>


                           SUMMARY COMPENSATION TABLE

<TABLE>
<CAPTION>

                                                         Long-Term
                                      Annual            Compensation
          Name and                 Compensation          Securities   All Other
                                   ------------          Underlying   Compen-
  Principal Position<F1> Year    Salary($)   Bonus($)    Options(#)   sation($)
  ---------------------  ----    ---------   --------    ----------   ---------

<S>                      <C>      <C>        <C>           <C>         <C>
C. W. Mueller,           1999     580,000    206,000       75,300      45,850 <F2>
Chairman of Ameren;      1998     550,000    198,000       63,800      53,751
President and            1997     500,000    155,000       23,000      45,723
Chief Executive Officer,
Ameren, Union Electric
and Ameren Services
Company

G. L. Rainwater          1999     342,000     97,500       27,900       4,825 <F2>
President and Chief      1998     325,000     93,000       25,800          66
Executive Officer, CIPS  1997     246,000        -            -           134

D. E. Brandt             1999     292,000     78,800       27,900      35,781 <F2>
Senior Vice President,   1998     274,000     79,000       25,800      31,947
Ameren, Union Electric   1997     254,000     64,000        7,800      27,580
and Ameren Services
Company

P. A. Agathen            1999     242,000     65,300       27,900      22,435 <F2>
Senior Vice              1998     230,000     63,000       25,800      19,644
President, Ameren        1997     215,000     51,000        7,800      18,045
Services Company

G. L. Randolph           1999     236,000     47,800       10,700       6,833 <F2>
Vice President,          1998     220,000     47,000        9,700       6,294
Union Electric           1997     192,000     38,000        3,400       5,953

<FN>


<F1> Includes   compensation   received   as  an   officer  of  Ameren  and  its
     subsidiaries.
<F2> Amounts  include  (a)  matching  contributions  to the 401(k)  plan and (b)
     above-market earnings on deferred compensation, as follows:

                                       (a)           (b)

                  C. W. Mueller      $4,800        $41,050
                  G. L. Rainwater     3,952            873
                  D. E. Brandt        5,313         30,468
                  P. A. Agathen       4,605         17,830
                  G. L. Randolph      5,706          1,127

</FN>

</TABLE>


                                      -14-

<PAGE>


                              OPTION GRANTS IN 1999

<TABLE>
<CAPTION>


                    Number of      % of Total                          Grant
                      Shares         Options                            Date
                    Underlying     Granted to   Exercise               Present
                     Options        Employees    Price     Expiration  Value<F2>
         Name       Granted<F1>      in 1999     ($/Sh)      Date        ($)
         ----       ----------       -------     ------      ----        ---

<S>                   <C>             <C>        <C>        <C>        <C>
C. W. Mueller         75,300          9.8        36.625     2/12/09    354,663
G. L. Rainwater       27,900          3.63       36.625     2/12/09    131,409
D. E. Brandt          27,900          3.63       36.625     2/12/09    131,409
P. A. Agathen         27,900          3.63       36.625     2/12/09    131,409
G. L. Randolph        10,700          1.39       36.625     2/12/09     50,397

<FN>

<F1> Options vest 25%  annually  beginning  February  12, 2001.  Options are not
     transferable.

<F2> The Grant Date Present  Values were  determined  using the binomial  option
     pricing  model,  a derivative of the  Black-Scholes  option  pricing model.
     Assumptions used for the model are as follows: an option term of ten years,
     stock volatility of 18.80%, a dividend yield of 6.51%,  risk-free  interest
     rate of 5.44%, and a vesting restrictions discount rate of 3% per year over
     the five-year  vesting period.  The Grant Date Present Value calculation is
     presented in accordance with SEC proxy requirements, and the Company has no
     way to determine whether the pricing model can properly determine the value
     of an option.  There is no assurance  that the value,  if any,  that may be
     realized by the optionee unless the stock price increases from the exercise
     price, in which case shareholders would benefit commensurately.

</FN>

</TABLE>

                       AGGREGATED OPTION EXERCISES IN 1999
                               AND YEAR-END VALUES

<TABLE>
<CAPTION>

                                                                           Value of
               Shares                        Unexercised                 In-the-Money
              Acquired       Value             Options                      Options
                 on        Realized         at Year End(#)               at Year End($)
     Name     Exercise        $         Exercisable Unexercisable   Exercisable Unexercisable
     ----     --------  -------------   ----------- -------------   ----------- -------------

<S>              <C>         <C>           <C>         <C>              <C>         <C>
C. W. Mueller     -           -            25,925      169,715           -           -

G. L. Rainwater   -           -               -         53,700           -           -

D. E. Brandt      -           -            9,550        64,350           -           -

P. A. Agathen     -           -            6,925        63,475           -           -

G. L. Randolph    -           -            3,675        24,725           -           -

</TABLE>

                                      -15-

<PAGE>


Ameren Retirement Plan

     Most salaried  employees of Ameren and its subsidiaries earn benefits under
the Ameren  Retirement Plan  immediately  upon  employment.  Benefits  generally
become  vested  after five years of service.  On an annual  basis a  bookkeeping
account in a participant's name is credited with an amount equal to a percentage
of the participant's  pensionable  earnings for the year.  Pensionable  earnings
equals base pay,  overtime and annual  bonuses,  which are equivalent to amounts
shown as "Annual Compensation" in the Summary Compensation Table. The applicable
percentage is based on the  participant's age as of December 31 of that year. If
the participant was an employee prior to July 1, 1998, an additional  transition
credit percentage is credited to the  participant's  account through 2007 (or an
earlier  date if the  participant  had less than 10 years of service on December
31, 1998.

<TABLE>
<CAPTION>

Participant's Age     Regular Credit for     Transition Credit
on December 31     Pensionable Earnings<F1> Pensionable Earnings    Total Credits
- --------------     ---------------------   --------------------    -------------
<S>                        <C>                      <C>                  <C>
Less than 30                3%                       1%                   4%

30 to 34                    4%                       1%                   5%

35 to 39                    4%                       2%                   6%

40 to 44                    5%                       3%                   8%

45 to 49                    6%                      4.5%                 10.5%

50 to 54                    7%                       4%                   11%

55 and over                 8%                       3%                   11%

<FN>

<F1> An additional  regular  credit of 3% is received for  pensionable  earnings
     above the Social Security wage base.
</FN>

</TABLE>

     These accounts also receive interest credits based on the average yield for
one-year U.S.  Treasury  Bonds for the previous  October,  plus 1%. In addition,
certain annuity benefits earned by participants under prior plans as of December
31,  1997  were  converted  to  additional  credit  balances  under  the  Ameren
Retirement Plan as of January 1, 1998. When a participant terminates employment,
the amount credited to the  participant's  account is converted to an annuity or
paid to the  participant in a lump sum. The participant can also choose to defer
distribution, in which case the account balance is credited with interest at the
applicable rate until the future date of distribution.  Benefits are not subject
to any deduction for Social Security or other offset amounts.

                                      -16-

<PAGE>


     In certain cases pension  benefits under the Retirement Plan are reduced to
comply  with  maximum  limitations  imposed  by the  Internal  Revenue  Code.  A
Supplemental   Retirement  Plan  is  maintained  by  Ameren  to  provide  for  a
supplemental benefit equal to the difference between the benefit that would have
been paid if such Code  limitations  were not in effect and the reduced  benefit
payable as a result of such Code limitations.  The plan is unfunded and is not a
qualified plan under the Internal Revenue Code.

     The  following  table  shows  the  estimated  annual  retirement  benefits,
including  supplemental  benefits,  which  would be  payable  to each  executive
officer listed if he were to retire at age 65 at his 1999 base salary and annual
bonus, and payments were made in the form of a single life annuity.

<TABLE>
<CAPTION>


          Name             Year of 65th Birthday     Estimated Annual Benefit
          ----             ---------------------     ------------------------
      <S>                        <C>                          <C>

      C. W. Mueller              2003                         $430,000

      G. L. Rainwater            2011                          203,000

      D. E. Brandt               2019                          273,000

      P. A. Agathen              2012                           99,000

      G. L. Randolph             2013                          192,000

</TABLE>

Change of Control Severance Plan

     Under the Ameren Corporation  Change of Control Severance Plan,  designated
officers  of Ameren and its  subsidiaries,  including  current  officers  of the
Company  named in the  Summary  Compensation  Table,  are  entitled  to  receive
severance benefits if their employment is terminated under certain circumstances
within three years after a "change of control". A "change of control" occurs, in
general,  if (i) any  individual,  entity or group  acquires  20% or more of the
outstanding  Common  Stock of  Ameren  or of the  combined  voting  power of the
outstanding  voting  securities  of  Ameren;  (ii)  individuals  who,  as of the
effective date of the Plan,  constitute the Board of Directors of Ameren, or who
have  been  approved  by a  majority  of the  Board,  cease  for any  reason  to
constitute a majority of the Board; or (iii) Ameren enters into certain business
combinations, unless certain requirements are met regarding continuing ownership
of the  outstanding  Common  Stock  and  voting  securities  of  Ameren  and the
membership of its Board of Directors.

                                      -17-

<PAGE>


     Severance benefits are based upon a severance period of two or three years,
depending on the  officer's  position.  An officer  entitled to  severance  will
receive the  following:  (a) salary and unpaid  vacation pay through the date of
termination;  (b) a pro rata bonus for the year of termination,  and base salary
and bonus for the severance period;  (c) continued employee welfare benefits for
the severance  period;  (d) a cash payment  equal to the actuarial  value of the
additional benefits the officer would have received under Ameren's qualified and
supplemental  retirement plans if employed for the severance  period;  (e) up to
$30,000 for the cost of outplacement  services;  and (f)  reimbursement  for any
excise tax  imposed  on such  benefits  as excess  payments  under the  Internal
Revenue Code.

                                      -18-

<PAGE>


                                PERFORMANCE GRAPH

<TABLE>
<CAPTION>

                         5 Year Cumulative Total Return
                 Ameren Corporaion <F1>, S&P 500, EEI Index<F2>
      Value of $100 invested 12/31/94, including reinvestment of dividends

               YEAR             AEE            S&P            EEI
               ----             ---            ---            ---
               <S>           <C>             <C>            <C>

               1994           100.00         100.00         100.00
               1995           132.87         137.50         131.02
               1996           130.33         169.47         132.59
               1997           159.54         226.04         168.88
               1998           166.30         291.05         192.34
               1999           136.80         352.57         156.56

<FN>

<F1> Information  shown for Ameren  Corporation  prior to 1/1/98  is based on an
     assumed aggrigate investment of $100 on 12/31/94 in the Common Stock of the
     companies  whose Common Stock was  exchanged for Ameren Common Stock in the
     Merger,  consisting of $74 invested in Union Electric  Common Stock and $26
     invested in CIPSCO  Incorporated Common Stock. Such amounts were determined
     based upon the percentages,  of the total number of shares of Ameren Common
     Stock  issued in the Merger,  that were issued in exchange for Common Stock
     of Union Electric and CIPSCO Incorporated.

<F2> Edison Electric Institute Index of 100 investor-owned electric utilities.
</FN>

</TABLE>

                                      -19-

<PAGE>


                             INDEPENDENT ACCOUNTANTS

     The Company has not selected its  independent  accountants  for 2000.  This
selection  is expected to be made by the Board of  Directors  after the Auditing
Committee of the Board of Directors,  the members of which are identified  under
"Item (1):  Election of  Directors",  has reviewed the prior year's audit report
with  representatives  of the independent  accountants for such year. After such
review,  the Auditing Committee will recommend to the Board of Directors for its
approval the selection of independent  accountants  for the Company for 2000 and
the fees to be paid for the regular annual audit.

     PricewaterhouseCoopers  LLP served as the Company's independent accountants
in 1999.  Representatives  of that firm are expected to be present at the annual
meeting  with the  opportunity  to make a  statement  if they so desire  and are
expected to be available to respond to appropriate questions.

     PricewaterhouseCoopers  LLP also served as independent  accountants for the
Company's subsidiaries, including Union Electric and CIPS, in 1999.


                              STOCKHOLDER PROPOSALS

     Any stockholder  proposal  intended for inclusion in the proxy material for
the Company's 2001 Annual Meeting of  Stockholders  must be received by November
16, 2000.

     In addition, under the Company's By-Laws, stockholders who intend to submit
a proposal in person at an Annual Meeting,  or who intend to nominate a director
at a Meeting,  must provide advance  written notice along with other  prescribed
information.  In general,  such notice must be received by the  Secretary of the
Company at the principal  executive  offices of the Company not later than 60 or
earlier than 90 days prior to the Meeting. A copy of the By-Laws can be obtained
by written request to the Secretary of the Company.


                       SECTION 16(a) BENEFICIAL OWNERSHIP
                              REPORTING COMPLIANCE

     A Form 4, Statement of Changes of Beneficial Ownership of Securities, filed
by Paul A. Agathen,  Senior Vice President of Ameren Services Company,  pursuant
to Section  16(a) of the  Securities  Exchange Act of 1934  relating to a single
transaction, was not filed on a timely

                                      -20-

<PAGE>


basis. The Company is not aware of any other reports on Form 3, Form 4 or Form 5
under such Act that were not filed on a timely basis.


                                  MISCELLANEOUS

     In addition to the use of the mails,  proxies may be  solicited by personal
interview,  or by  telephone or other means,  and banks,  brokers,  nominees and
other  custodians  and  fiduciaries  will be  reimbursed  for  their  reasonable
out-of-pocket  expenses in forwarding  soliciting  material to their principals,
the  beneficial  owners of stock of the  Company.  Proxies may be  solicited  by
officers,  directors  and key  employees  of the  Company on a  voluntary  basis
without  compensation.  The Company will bear the cost of soliciting  proxies on
its behalf.


                                  _____________

A COPY OF THE COMPANY'S MOST RECENT ANNUAL REPORT TO THE SECURITIES AND EXCHANGE
COMMISSION ON FORM 10-K WILL BE FURNISHED,  WITHOUT  CHARGE,  TO STOCKHOLDERS OF
THE COMPANY  UPON WRITTEN  REQUEST TO STEVEN R.  SULLIVAN,  SECRETARY,  P.O. BOX
66149, ST. LOUIS, MISSOURI 63166-6149.

FOR UP-TO-DATE  INFORMATION  ABOUT THE COMPANY,  PLEASE VISIT THE COMPANY'S HOME
PAGE ON THE INTERNET - http://www.ameren.com


                                      -21-



<PAGE>



AMEREN CORPORATION
P. O. BOX 66149, ST. LOUIS, MISSOURI 63166-6149                            PROXY




         THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS FOR
         THE ANNUAL MEETING OF STOCKHOLDERS TO BE HELD ON APRIL 25, 2000


The undersigned  hereby appoints  CHARLES W. MUELLER and STEVEN R. SULLIVAN, and
either  of  them,  each  with  the  power  of  substitution,  as  proxy  for the
undersigned,  to vote all the  shares of  capital  stock of  AMEREN  CORPORATION
represented  hereby at the Annual Meeting of  Stockholders  to be held at Powell
Symphony Hall, 718 North Grand Boulevard, St. Louis, Missouri, on April 25, 2000
at 9:00 A.M.,  and at any  adjournment  thereof,  upon all  matters  that may be
submitted to a vote of stockholders including the matters described in the proxy
statement furnished herewith, subject to any directions indicated on the reverse
side of this proxy form and in their  discretion on any other matter that may be
submitted to a vote of stockholders.

     NOMINEES FOR DIRECTOR -  WILLIAM E. CORNELUS, CLIFFORD L. GREENWALT, THOMAS
                              A. HAYS, RICHARD A LIDDY, GORDON R. LOHMAN,
                              RICHARD A. LUMPKIN, JOHN PETERS MacCARTHY, HANNE
                              M. MERRIMAN, PAUL L. MILLER, JR., CHARLES W.
                              MUELLER, ROBERT H. QUENON, HARVEY SALIGMAN,
                              JANET MCAFEE WEAKLEY AND JAMES W. WOGSLAND


PLEASE VOTE, DATE AND SIGN ON THE REVERSE SIDE hereof and return this proxy form
promptly in the enclosed envelope.  If you attend the meeting and wish to change
your vote, you may do so automatically by casting your ballot at the meeting.

                          SEE REVERSE SIDE




<PAGE>


                   - - THANK YOU FOR YOUR PROMPT ATTENTION - -

                              FOLD AND DETACH HERE

<TABLE>

<S><C>

/ x /      Please mark votes                   This proxy will be voted as specified below.  If no direction is made, this
           as in this example.                 proxy will be voted FOR all nominees listed on the reverse side and as
                                               recommended by the Board on the other items listed below.

THE BOARD OF DIRECTORS RECOMMENDS VOTING FOR ITEM 1.                THE BOARD OF DIRECTORS RECOMMENDS A VOTE AGAINST ITEMS 2 AND 3.
- ----------------------------------------------------                ---------------------------------------------------------------
            FOR all nominees    WITHHOLD AUTHORITY
            (except as listed   all nominees
             below)
                                                                 FOR    AGAINST  ABSTAIN                     FOR    AGAINST  ABSTAIN
ITEM 1            /     /          /     /          ITEM 2      /   /    /   /    /   /   ITEM 3            /   /    /   /    /   /
ELECTION OF                                         REPORT ON                             CUMULATIVE
DIRECTORS                                           CALLAWAY                              VOTING
                                                    PLANT RELEASES

FOR ALL EXCEPT:__________________________________                                             ATTENDANCE CARD REQUESTED     /    /

                                                  [AMEREN LOGO]

                                                                                                                          SEE
                                                                                DATED__________________________2000       REVERSE
                                                                                                                          SIDE


                                                                       -------------------------------------------------------
                                                                       SIGNATURE - Please sign exactly as name appears hereon.


                                                                       -------------------------------------------------------
                                                                       CAPACITY (OR SIGNATURE IF HELD JOINTLY)

                                                                       Shares registered in the name of a Custodian or Guardian
                                                                       must be signed by such.  Executors, administrators,
                                                                       trustees, etc. should so indicate when signing.


</TABLE>



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