CENTRAL ILLINOIS PUBLIC SERVICE CO
DEF 14A, 2000-03-29
ELECTRIC & OTHER SERVICES COMBINED
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[AMERENCIPS LOGO]


NOTICE OF ANNUAL MEETING OF
STOCKHOLDERS AND PROXY STATEMENT OF
CENTRAL ILLINOIS PUBLIC SERVICE COMPANY



      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>



CENTRAL ILLINOIS PUBLIC SERVICE COMPANY

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

To the Stockholders of

        CENTRAL ILLINOIS PUBLIC SERVICE COMPANY


     We will hold the Annual Meeting of Stockholders of Central  Illinois Public
Service Company 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; and

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

     If you owned shares of the Company's capital 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 President and the Board of Directors.



                                    STEVEN R. SULLIVAN
                                    Secretary



St. Louis, Missouri
March 30, 2000


<PAGE>


PROXY STATEMENT OF CENTRAL ILLINOIS
PUBLIC SERVICE COMPANY
(First sent or given to stockholders March 30, 2000)

Principal Executive Offices:
607 East Adams Street, Springfield, IL 62739

     The  enclosed  proxy is  solicited  by the Board of  Directors  of  Central
Illinois Public Service Company, d/b/a AmerenCIPS ("CIPS" or the "Company"), 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, Union Electric Company,  d/b/a AmerenUE ("Union Electric"),  and Ameren
Services   Company  are  the  principal   subsidiaries  of  Ameren   Corporation
("Ameren").

     As  information,  the CIPS annual meeting will be held in conjunction  with
the Ameren and Union Electric annual meetings.


                                     VOTING

     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  25,452,373  shares of Common  Stock,  all of
which were owned by Ameren, and 800,000 shares of Cumulative  Preferred Stock of
various series.  In order to conduct the meeting,  a majority of the outstanding
shares entitled to vote must be represented. Each stockholder is entitled to one
vote, for each share of stock of the Company (whether common or preferred) held,
on each matter  submitted to a vote at the meeting,  except that in the election
of directors,  each  stockholder is entitled to vote  cumulatively and therefore
may give one  nominee  votes  equal to the number of  directors  to be  elected,
multiplied by the number of shares held by such  stockholder,  or such votes may
be distributed  among any two or more nominees.  The proxies seek  discretionary
authority to cast cumulative votes in the election of directors.

     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

                                      -1-

<PAGE>

choices, your shares will be voted as recommended by the Board - FOR the Board's
nominees for Director.  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,  withheld
votes, abstentions, and non-votes by banks and brokers are not included.

     Holders of depositary shares ("Depositary Shares") representing one-quarter
of one share of 6.625% Cumulative  Preferred Stock of the Company will receive a
form of proxy so that they may instruct Ameren Services  Company,  as depository
agent, as to the manner of voting such Depositary  Shares.  The depository agent
will vote  whole  shares of 6.625%  Cumulative  Preferred  Stock  based on those
instructions from holders of Depositary Shares.

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


                             ITEMS TO BE CONSIDERED

Item (1):  Election of Directors

     Five  directors are to be elected 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,  all of whom are executive officers of the
Company  or its  affiliates,  are  listed  below with  information  about  their
principal occupations and backgrounds.

PAUL A. AGATHEN

Senior Vice President of Ameren  Services  Company.  Mr. Agathen was employed by
Union  Electric in 1975 as an attorney.  He was named General  Attorney of Union
Electric in 1982,  Vice President,  Environmental  and Safety in 1994 and Senior
Vice  President  in 1996.  He was  elected  to his  present  position  at Ameren
Services  Company  upon the Merger.  Director of the Company  since 1997.  Other
directorships: Union Electric (since 1998). Age: 52.

                                      -2-

<PAGE>


WARNER L. BAXTER

Vice  President and  Controller of the Company and Vice President and Controller
of Ameren,  Union Electric and Ameren Services  Company.  From 1983 to 1995, Mr.
Baxter was employed by Price  Waterhouse (now  PricewaterhouseCoopers  LLP). Mr.
Baxter joined Union Electric in 1995 as Assistant Controller. He was promoted to
Controller  of  Union  Electric  in 1996  and was  elected  Vice  President  and
Controller of Union Electric, Ameren and Ameren Services Company in 1998. He was
elected  Vice   President  and   Controller  of  the  Company  in  1999.   Other
directorships: Union Electric (since 1999). Age: 38.

DONALD E. BRANDT

Senior Vice  President  - Finance of Ameren and Senior Vice  President - Finance
and Corporate Services of Union Electric and Ameren Services Company. Mr. Brandt
worked for Price Waterhouse (now PricewaterhouseCoopers LLP) from 1975 until his
appointment  as  Controller  of Union  Electric  in 1983.  He was  elected  Vice
President of Union  Electric in 1985 and Senior Vice  President in 1988.  He was
elected to his present  positions at Ameren and Ameren Services Company upon the
Merger. Director of the Company since 1997. Other directorships:  Union Electric
(since 1998); Huntco, Inc.; Mercantile Mutual Funds, Inc. Age: 45.

CHARLES W. MUELLER

Chairman,  President  and Chief  Executive  Officer of Ameren 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 President and
Chief Executive  Officer of Ameren and Ameren Services  Company upon the Merger.
Director  of the  Company  since  1997.  Mr.  Mueller is Deputy  Chairman of the
Federal  Reserve Bank of St. Louis.  Other  directorships:  Ameren (since 1997);
Union Electric (since 1993); Angelica Corporation. Age: 61.

GARY L. RAINWATER

President and Chief Executive Officer of the Company.  Mr. Rainwater was elected
Executive  Vice  President  of the Company in January  1997 and was named to his
present  position in  December  1997.  Before  joining the Company he worked for
Union Electric for 17 years, beginning his career in 1979 as an engineer. He was
named General

                                      -3-

<PAGE>


Manager-Corporate  Planning in 1988 and Vice President in 1993.  Director of the
Company since 1997. Other directorships: Union Electric (since 1998). Age: 53.

     The five 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 five times.  All nominees  attended
all of the meetings of the Board for which they were eligible.

     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 Officer 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.

     Board Committees - The Board of Directors has an Executive  Committee which
has such duties as may be  delegated  to it from time to time by the Board.  The
members of the Executive  Committee are Messrs.  Brandt,  Mueller and Rainwater.
The Executive Committee did not meet in 1999.

     The Board does not have any standing  committees  other than the  Executive
Committee.  The  Board  committees  of the  Company's  parent,  Ameren,  perform
committee functions for the Company's Board.

     Directors'  Compensation - All nominees for director are executive officers
of Ameren or its  subsidiaries,  and they do not receive  compensation for their
services as a director.

Item (2):  Other Matters

     The  Board  of  Directors  does  not know of any  matters,  other  than the
election of directors, which may be presented to the meeting.

                                      -4-

<PAGE>


                               SECURITY OWNERSHIP

Securities of the Company

     All of the  outstanding  shares of the Company's  Common Stock are owned by
Ameren. Of the 800,000 shares of the Company's outstanding  Cumulative Preferred
Stock,  an aggregate of eight shares were owned by all  directors  and executive
officers of the Company as a group as of February 1, 2000.


Securities of Ameren

<TABLE>
<CAPTION>

                                                    Shares of Common Stock
                                                           of Ameren
                                                      Beneficially Owned<F1><F2>
             Name                                  as of February 1, 2000
       <S>                                                  <C>
       Paul A. Agathen                                      15,043
       Warner L. Baxter                                      4,319
       Donald E. Brandt                                     14,580
       Gilbert W. Moorman                                    1,223
       Charles W. Mueller                                   45,054
       Gary L. Rainwater                                     4,416
       Steven R. Sullivan                                      426
       Thomas R. Voss                                        3,926

       All Directors and executive officers as a group         105,059

<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.
     Baxter,  4,175;  Mr. Brandt,  13,200;  Mr. Mueller,  36,175;  and Mr. Voss,
     1,683.  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>

                                      -5-

<PAGE>


                             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  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

                                      -6-

<PAGE>

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  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
Officer,  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 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.

                                      -7-

<PAGE>

<TABLE>
<CAPTION>

                           SUMMARY COMPENSATION TABLE
                                                            Long-Term
                                         Annual            Compensation
                                       Compensation         Securities    All Other
      Name and                         ------------          Underlying   Compen-
 Principal Position      Year     Salary($)      Bonus($)    Options(#)   sation($)
 ------------------      ----     ---------      --------    ----------   ---------
<S>                      <C>       <C>            <C>          <C>          <C>
G. L. Rainwater          1999      342,000        97,500       27,900       4,825 <F1>
President and Chief      1998      325,000        93,000       25,800          66
Executive Officer<F2>    1997      246,000           -            -           134

T. R. Voss               1999      190,000        50,800       10,700       6,728 <F1>
Senior Vice President -  1998      142,000        23,000        3,350       4,164
Customer Services;       1997      117,200         9,800        1,070       3,631
Senior Vice President,
Union Electric and
Ameren Services
Company<F4>

S. R. Sullivan           1999      190,000        40,600       10,700       4,624 <F1>
Vice President, General  1998       98,000        21,000        5,300       1,075 <F3>
Counsel and Secretary;   1997          -             -            -            -  <F3>
and Vice President,
General Counsel and
Secretary, Ameren,
Union Electric and
Ameren Services
Company<F4>

G. W. Moorman            1999     180,000     32,400       10,700       6,147 <F1>
Vice President-          1998     175,500     29,000        9,700       1,703
Regional Operations      1997     169,000        -            -            -

W. L. Baxter             1999     175,000     37,400        10,700      5,240 <F1>
Vice President and       1998     157,000     35,000         9,700      2,753
Controller; and Vice     1997     143,000     28,000         3,400      2,318
President and Controller,
Ameren, Union Electric
and Ameren Services
Company<F4>

<FN>

<F1> Amounts  include  (a)  matching  contributions  to the 401(k)  plan and (b)
     above-market earnings on deferred compensation, as follows:

                                       (a)           (b)
                  G. L. Rainwater   $3,952          $873
                  T. R. Voss         6,099           629
                  S. R. Sullivan     4,295           329
                  G. W. Moorman      5,966           181
                  W. L. Baxter       4,626           614

<F2> Amount  paid to Mr.  Rainwater  for  period  prior to January  13,  1997 is
     compensation earned as an employee of Union Electric.
<F3> Mr. Sullivan  commenced his employment with Ameren and its  subsidiaries on
     June 16, 1998.
<F4> Includes compensation received as an officer of Ameren and its subsidiaries
     including the Company.
</FN>
</TABLE>

                                      -8-

<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>
G. L. Rainwater      27,900          3.63       36.625     2/12/09    131,409
T. R. Voss           10,700          1.39       36.625     2/12/09     50,397
S. R. Sullivan       10,700          1.39       36.625     2/12/09     50,397
G. W. Moorman        10,700          1.39       36.625     2/12/09     50,397
W. L. Baxter         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
                                                                                       In-the-Money
                      Shares       Unexercised              Options                      Options
                     Aquired         Valued              at Year End(#)               at Year End($)
                       on           Realized             --------------               --------------
     Name           Exercise(#)         $          Exercisable    Unexercisable  Exercisable   Unexercisable
     ----           -----------   -------------    -----------    -------------  -----------   -------------
<S>                     <C>            <C>              <C>           <C>             <C>           <C>
G. L. Rainwater          -              -                -            53,700           -             -

T. R. Voss               -              -              1,207          15,443           -             -

S. R. Sullivan           -              -                -            16,000           -             -

G. W. Moorman            -              -                -            20,400           -             -

W. L. Baxter             -              -              2,700          24,400         2,763        46,660

                                      -9-
</TABLE>

<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).

Participant's Age    Regular Credit for     Transition Credit
on December 31     Pensionable Earnings*   Pensionable Earnings    Total Credits
- --------------     ---------------------   --------------------    -------------
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%


*    An additional  regular  credit of 3% is received for  pensionable  earnings
     above the Social Security wage base.

     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.

                                      -10-

<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.

          Name             Year of 65th Birthday     Estimated Annual Benefit
          ----             ---------------------     ------------------------
      G. L. Rainwater            2011                         $203,000

      T. R. Voss                 2012                          151,000

      S. R. Sullivan             2025                          156,000

      G. W. Moorman              2008                          156,000

      W. L. Baxter               2026                          150,000


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.

                                      -11-

<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.


                             INDEPENDENT ACCOUNTANTS

     The Company has not selected its  independent  accountants  for 2000.  This
selection is expected to be made by the Board of Directors of Ameren Corporation
after the  Auditing  Committee of that Board 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 that  Board for its
approval the selection of  independent  accountants  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.


                              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 December
1, 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.

                                      -12-

<PAGE>

                                  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.

                                      -13-

<PAGE>


CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
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 CENTRAL ILLINOIS PUBLIC
SERVICE COMPANY  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 - PAUL A. AGATHEN, WARNER L. BAXTER, DONALD E. BRANDT,
                          CHARLES W. MUELLER AND GARY L. RAINWATER


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




                   - - THANK YOU FOR YOUR PROMPT ATTENTION - -

                            v FOLD AND DETACH HERE v



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

THE BOARD OF DIRECTORS RECOMMENDS VOTING FOR ITEM 1.

  FOR all nominees    WITHHOLD AUTHORITY  Holders of depositary
  (except as listed      all nominees     shares representing    ATTENDANCE CARD
   below)                                 1/4 of a share of         REQUESTED
                                          6.625% cumulative Pre-
ITEM 1  /   /              /   /          ferred Stock direct         /   /
DIRECTORS                                 Ameren Services Company,
                                          as depository agent for
FOR ALL EXCEPT:__________________         holders of depositary
                                          shares, to appoint proxies
                                          to vote as indicated herein.



                              [AMERENCIPS 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.



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