AMEREN CORP
S-8, 1998-01-05
METAL MINING
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<PAGE>   1
 



       AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 5, 1998
                                       REGISTRATION STATEMENT NO. 33-___________
================================================================================





                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                    FORM S-8
                             REGISTRATION STATEMENT
                                    UNDER THE
                             SECURITIES ACT OF 1933

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



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

      STATE OF MISSOURI                                          43-1723446
  (State or other jurisdiction                                 (IRS Employer
of incorporation or organization)                            Identification No.)
                                                   
                                                


                              1901 CHOUTEAU AVENUE
                            ST. LOUIS, MISSOURI 63103
          (Address, including zip code, of principal executive offices)

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


                 UNION ELECTRIC COMPANY SAVINGS INVESTMENT PLAN
                            (Full title of the plan)


                DONALD E. BRANDT, Senior Vice President, Finance
                          JAMES C. THOMPSON, Secretary
                 1901 Chouteau Avenue, St. Louis, Missouri 63103
                                 (314) 621-3222
(Names, address and telephone number, including area code, of agents for 
service)

<TABLE>
<CAPTION>

                                                                 CALCULATION OF REGISTRATION FEE

=============================================================================================================================
                                                                    Proposed
           TITLE OF SECURITIES                    Amount             maximum        Proposed maximum         Amount of
             TO BE REGISTERED                     to be          offering price         aggregate          registration
                                                Registered          per unit*        offering price             fee
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                             <C>                 <C>               <C>                     <C>    
COMMON STOCK, $.01 PAR VALUE,
INCLUDING RELATED PLAN INTERESTS - UNION        2,600,000
ELECTRIC COMPANY SAVINGS INVESTMENT               shares            $42.2816          $109,932,160            $33,313
PLAN
=============================================================================================================================
</TABLE>



*   Calculated in accordance with Rule 457(h) on the basis of the average of the
    high and low prices of Union Electric Company Common Stock as reported on
    the New York Stock Exchange Composite Tape on December 26, 1997.

================================================================================






<PAGE>   2



                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3.  INCORPORATION OF DOCUMENTS BY REFERENCE

         The following documents, previously filed with the Commission by CIPSCO
Incorporated ("CIPSCO") (File No. 1-10628), Union Electric Company ("Union
Electric") (File No. 1-2967), the Registrant and the Union Electric Company
Savings Investment Plan (the "Plan") pursuant to the Securities Exchange Act of
1934, as amended, are incorporated by reference in this Registration Statement:

         1. CIPSCO'S Annual Report on Form 10-K for the year ended December 31,
1996.

         2. CIPSCO's Quarterly Reports on Form 10-Q for the quarters ended March
31, 1997, June 30, 1997 and September 30, 1997.

         3. CIPSCO's Current Reports on Form 8-K dated March 20, November 24,
December 16 and December 31, 1997.

         4. Union Electric's Annual Report on Form 10-K for the year ended
December 31, 1996.

         5. Union Electric's Quarterly Reports on Form 10-Q for the quarters
ended March 31, 1997, June 30, 1997 and September 30, 1997.

         6. Union Electric's Current Reports on Form 8-K dated December 16 and
December 31, 1997.

         7. The Registrant's Current Report on Form 8-K dated December 31, 1997.

         8. The Registrant's Registration Statement on Form S-4 (Reg. No.
33-64165), filed November 13, 1995, which includes a description of the Common
Stock of the Registrant.

         9. The Plan's Annual Report on Form 11-K for the year ended December
31, 1996.

All documents subsequently filed by the Registrant or the Plan pursuant to
Sections 13(a), 13(c), 14 and 15(d) of the Securities Exchange Act of 1934, as
amended, prior to the filing of a post-effective amendment which indicates that
all securities offered have been sold or which deregisters all securities then
remaining unsold, shall be deemed to be incorporated by reference herein and to
be a part hereof from the date of the filing of such documents.

ITEM 4.  DESCRIPTION OF SECURITIES

         Not Applicable.

ITEM 5.  INTERESTS OF NAMED EXPERTS AND COUNSEL

         William E, Jaudes, Esq., Vice President and General Counsel of the
Registrant, will pass upon the legality of the shares of Common Stock of the
Registrant and Plan interests to be issued under the Plan.  Mr. Jaudes is 
eligible to participate in the Plan.


                                     II - 1

<PAGE>   3



ITEM 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

         Article IV of the Registrant's By-Laws, consistent with the applicable
provisions of the Missouri General and Business Corporation Law (the "MGBCL"),
provides for indemnification of directors and officers. These provisions provide
that any person shall be indemnified for expenses and liabilities imposed upon
such person in connection with any threatened, pending or completed action,
suit, or proceeding, whether civil, criminal, administrative or investigative,
other than an action by or in the right of the Registrant, by reason of the fact
that such person is or was a director, officer, employee or agent of the
Registrant, or is or was serving at the request of the Registrant as a director,
officer, employee or agent of another corporation, partnership, joint venture,
trust or other enterprise, against expenses, including attorneys' fees,
judgments, fines and amounts paid in settlement actually and reasonably incurred
by such person in connection with such action, suit or proceeding if such person
acted in good faith and in a manner such person reasonably believed to be in or
not opposed to the best interests of the Registrant, and, with respect to any
criminal action or proceeding, had no reasonable cause to believe his conduct
was unlawful.

         In a proceeding brought by or in the right of the Registrant, no
indemnification shall be made with respect to any claim as to which an officer
or director has been adjudged to have been liable to Registrant, unless the
court determines that such a person is reasonably and fairly entitled to
indemnification for expenses. However, no indemnification shall be made in
respect of any claim, issue or matter as to which such person shall have been
adjudged to be liable for negligence or misconduct in the performance of his
duty to the Registrant unless and only to the extent that the court in which the
action or suit was brought determines upon application that, despite the
adjudication of liability and in view of all the circumstances of the case, the
person is fairly and reasonably entitled to indemnity for such expenses which
the court shall deem proper.

         The By-laws, consistent with the applicable provisions of the MGBCL,
provide that indemnification shall be made by the Registrant only if a
determination has been made by a majority vote of a quorum of the disinterested
directors or by the shareholders or by independent legal counsel, that the
director or officer met the required standard of conduct. The Registrant is
authorized to purchase liability insurance on behalf of an officer or director
whether or not the Registrant would otherwise have the power to indemnify such
person.

         The By-laws, consistent with the applicable provisions of the MGBCL,
further provide that, in addition to the indemnities described in the preceding
paragraphs, the Registrant will further indemnity its officers and directors to
the maximum extent permitted by law, provided that no indemnity may be given for
conduct that is adjudged to be knowingly fraudulent, deliberately dishonest, or
willful misconduct.

ITEM 7.  EXEMPTIONS FROM REGISTRATION CLAIMED

         Not Applicable.

ITEM 8.  EXHIBITS

         Exhibit No.

           4.1        Article III of the Restated Certificate of Incorporation
                      of the Registrant (incorporated by reference to Exhibit
                      3(i) of the Form S-4 Registration Statement of the
                      Registrant, Reg. No. 33-64165).

           4.2        By-Laws of the Registrant (incorporated by reference to
                      Annex G of the Joint Proxy Statement/Prospectus included
                      in the Form S-4 Registration Statement of the Registrant,
                      Reg. No. 33-64165).


                                     II - 2

<PAGE>   4



           5          Opinion of William E. Jaudes as to the legality of the
                      securities being issued.

          23.1        Consent of Price Waterhouse LLP.

          23.2        Consent of Arthur Andersen LLP.

          23.3        Consent of William E. Jaudes (included in Exhibit 5).

          24          Powers of Attorney.

ITEM 9.  UNDERTAKINGS

  (a)     The undersigned Registrant hereby undertakes:

          (1) To file, during any period in which offers or sales are being
made, a post-effective amendment to this registration statement:

                  (i)  To include any prospectus required by Section 10(a)(3) 
                       of the Securities Act of 1933;

                  (ii) To reflect in the prospectus any facts or events arising
after the effective date of the registration statement (or the most recent
post-effective amendment thereof) which, individually or in the aggregate,
represent a fundamental change in the information set forth in the registration
statement. Notwithstanding the foregoing, any increase or decrease in volume of
securities offered (if the total dollar value of securities offered would not
exceed that which was registered) and any deviation from the low or high end of
the estimated maximum offering range may be reflected in the form of prospectus
filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the
changes in volume and price represent no more than a 20% change in the maximum
aggregate offering price set forth in the "Calculation of Registration Fee"
table in the effective registration statement;

                  (iii) To include any material information with respect to the
plan of distribution not previously disclosed in the registration statement or
any material change to such information in the registration statement;

Provided, however, that paragraphs (a)(l)(i) and (a)(l)(ii) do not apply in the
registration statement is on Form S-3, Form S-8 or Form F-3, and the information
required to be included in a post-effective amendment by those paragraphs is
contained in periodic reports filed with or furnished to the Commission by the
registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange
Act of 1934 that are incorporated by reference in this registration statement.

          (2) That, for the purpose of determining any liability under the
Securities Act of 1933, each such post-effective amendment shall be deemed to be
a new registration statement relating to the securities offered therein and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

          (3) To remove from registration by means of a post-effective amendment
any of the securities being registered which remain unsold at the termination of
the offering.

  (b) The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to Section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement

                                     II - 3

<PAGE>   5



relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

  (c) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors, officers and controlling persons of
the Registrant pursuant to the provisions referred to in Item 6 of this
Registration Statement, or otherwise, the Registrant has been advised that in
the opinion of the Securities and Exchange Commission such indemnification is
against public policy as expressed in the Act and is, therefore, unenforceable.
In the event that a claim for indemnification against such liabilities (other
than the payment by the Registrant of expenses incurred or paid by a director,
officer or controlling person of the Registrant in the successful defense of any
action, suit or proceeding) is asserted by such director, officer or controlling
person in connection with the securities being registered, the Registrant will,
unless in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the Act and
will be governed by the final adjudication of such issue.


                                     II - 4

<PAGE>   6



                                   SIGNATURES


          THE REGISTRANT. Pursuant to the requirements of the Securities Act of
1933, the Registrant certifies that it has reasonable grounds to believe that it
meets all of the requirements for filing on Form S-8 and has duly caused this
Registration Statement to be signed on its behalf by the undersigned thereunto
duly authorized, in the City of St. Louis, State of Missouri, on the 2nd day of
January, 1998.




                                                AMEREN CORPORATION


                                                By   /s/Donald E. Brandt
                                                  ------------------------------
                                                        DONALD E. BRANDT
                                                  Senior Vice President, Finance


         Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the date above indicated.


      SIGNATURE                                       TITLE


                                                 
/s/ Charles W. Mueller*                    Chairman, President and Chief
- ------------------------------             Executive Officer and Director
    CHARLES W. MUELLER                      (Principal Executive Officer)

                                           
                                          
                                           


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


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



                                                     



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

                                                     




/s/ Thomas A. Hays*                                  Director
- ------------------------------               
    THOMAS A. HAYS
                                                     


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


                                                     


/s/                                                  Director
- ------------------------------
    GORDAN R. LOHMAN


                                                     

                                     II - 5

<PAGE>   7





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


                                                     


/s/ John Peters MacCarthy*                           Director
- ------------------------------
    JOHN PETERS MACCARTHY                                           

                                                     


/s/                                                  Director
- ------------------------------
    HANNE M. MERRIMAN

                                                     


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

                                                     


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

                                                     


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

                                                     


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

                                                     


/s/ Janet McAfee Weakley*                            Director
- ------------------------------
    JANET MCAFEE WEAKLEY

                                                     

 
/s/                                                  Director
- ------------------------------
   JAMES W. WOGSLAND

                                                     

                                       *By      /s/James C. Thompson
                                          --------------------------------------
                                                   JAMES C. THOMPSON
                                                    Attorney-In-Fact

                                     II - 6

<PAGE>   8



       THE PLAN. Pursuant to the requirements of the Securities Act of 1933, the
persons who administer the undersigned employee benefit plan have duly caused
this Registration Statement to be signed on their behalf by the undersigned
thereunto duly authorized, in the City of St. Louis, State of Missouri, on the
2nd day of January, 1998.


                                            UNION ELECTRIC COMPANY SAVINGS
                                            INVESTMENT PLAN



                                            By   /s/Donald E. Brandt
                                              ----------------------------------
                                                    DONALD E. BRANDT
                                              Senior Vice President, Finance
                                                  Ameren Corporation


                                     II - 7

<PAGE>   9




                                  EXHIBIT INDEX



Exhibit No.

   4.1       Article III of the Restated Certificate of Incorporation of the
             Registrant (incorporated by reference to Exhibit 3(i) of the Form
             S-4 Registration Statement of the Registrant, Reg. No. 33-64165).

   4.2       By-Laws of the Registrant (incorporated by reference to Annex G of
             the Joint Proxy Statement/Prospectus included in the Form S-4
             Registration Statement of the Registrant, Reg.
             No. 33-64165).

   5         Opinion of William E. Jaudes as to the legality of the securities
             being issued.

  23.1       Consent of Price Waterhouse LLP.

  23.2       Consent of Arthur Andersen LLP.

  23.3       Consent of William E. Jaudes (included in Exhibit 5).

  24         Powers of Attorney.



              All Exhibits are filed electronically with Form S-8.


                                     II - 8


<PAGE>   1



                                                                EXHIBIT 5










                                                  January 5, 1998


Ameren Corporation
1901 Chouteau Avenue
St. Louis, Missouri  63103

         Re:      Registration Statement on Form S-8 Relating to 2,600,000
                  Shares of Common Stock, Including Related Plan Interests

Ladies and Gentlemen:

         I have examined the Registration Statement on Form S-8 (the
"Registration Statement") filed by Ameren Corporation, a Missouri corporation
(the "Company"), with the Securities and Exchange Commission on January 5, 1998
in connection with the registration under the Securities Act of 1933, as
amended, of 2,600,000 shares of the Common Stock, $.01 par value per share,
including related plan interests (the "Common Stock"), of the Company to be
offered and sold pursuant to the Union Electric Company Savings Investment Plan.

         As Vice President and General Counsel of the Company, I have examined
the Restated Certificate of Incorporation and the By-laws of the Company, each
as amended to the date hereof, the records of corporate proceedings and other
actions taken by the Company in connection with the authorization, issuance and
sale of the Common Stock and such other documents and materials as I have deemed
necessary or appropriate to enable me to deliver this opinion.

         Based upon the foregoing, I am of the opinion that:

         Subject to (i) compliance with applicable state securities laws and
(ii) the filing and effectiveness of the Registration Statement with the
Securities and Exchange Commission, the Common Stock, when issued and sold in
the manner described in the Registration Statement, will be legally issued,
fully paid and nonassessable.

         I hereby consent to the filing of this opinion as an exhibit to the
Registration Statement.

                                           Yours truly,


                                           /s/William E. Jaudes
                                           ---------------------------
                                           William E. Jaudes
                                           Vice President and General Counsel
                                           Ameren Corporation




<PAGE>   1



                                                                  EXHIBIT 23.1


                       CONSENT OF INDEPENDENT ACCOUNTANTS


         We hereby consent to the incorporation by reference in this
Registration Statement on Form S-8 of our report dated February 4, 1997, which
appears on page 16 of the 1996 Annual Report to Shareholders of Union Electric
Company, which is incorporated by reference in Union Electric Company's Annual
Report on Form 10-K for the year ended December 31, 1996. We also consent to the
incorporation by reference in this Registration Statement on Form S-8 of our
report dated December 17, 1997, which appears on page 9 of Exhibit 99-2 to the
Ameren Corporation Current Report on Form 8-K dated December 31, 1997, with
respect to the supplemental consolidated financial statements of Ameren
Corporation as of December 31, 1996 and 1995 and for each of the three years in
the period ended December 31, 1996, except as such Ameren Corporation financial
statements relate to Central Illinois Public Service Company and CIPSCO
Investment Company. The Central Illinois Public Service Company and CIPSCO
Investment Company financial statements were audited by another independent
accountant. We also consent to the incorporation by reference in the
Registration Statement on Form S-4 (No. 33-64165) of Ameren Corporation dated
November 13, 1995 (the "Form S-4") of our report dated February 1, 1996, which
appears on page 16 of Union Electric Company's 1995 Annual Report to
Shareholders which is incorporated by reference in Union Electric Company's
Annual Report on Form 10-K for the year ended December 31, 1995, which Form 10-K
is incorporated by reference in the Form S-4. The Form S-4 is incorporated by
reference in this Registration Statement on Form S-8. We also consent to the
application of our reports to the Financial Statement Schedules, which appear on
pages 13 (1996 Form 10-K) and 12 (1995 Form 10-K) of Union Electric Company's
Annual Reports on Form 10-K, for each of the four years in the period ended
December 31, 1996, when such Schedules are read in conjunction with the
financial statements referred to in our reports dated February 4, 1997 and
February 1, 1996. We also consent to the incorporation by reference in this
Registration Statement on Form S-8 of our report dated June 6, 1997 appearing on
page 5 of the Annual Report of the Union Electric Company Savings Investment
Plan on Form 11-K for the year ended December 31, 1996.



/s/Price Waterhouse LLP
- ----------------------------
Price Waterhouse LLP
St. Louis, Missouri
December 31, 1997






<PAGE>   1



                                                                  EXHIBIT 23.2


                               ARTHUR ANDERSEN LLP




                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


         As independent public accountants, we hereby consent to the
incorporation by reference in this Registration Statement of our reports dated
January 31, 1997 and January 26, 1996 included in CIPSCO Incorporated's Form
10-K for the years ended December 31, 1996 and 1995, respectively, and to all
references to our Firm included in this Registration Statement.



                                                     /s/ARTHUR ANDERSEN LLP
                                                  ------------------------------
                                                        ARTHUR ANDERSEN LLP

Chicago, Illinois
December 30, 1997



<PAGE>   1



                                                                     EXHIBIT 24



                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Charles W. Mueller
hereby appoints Donald E. Brandt and/or James C. Thompson the true and lawful
attorneys-in-fact of the undersigned, for and in the name, place and stead of
the undersigned, to affix the name of the undersigned as a Director and as
Chairman of The Board, President, and Chief Executive Officer, of Ameren
Corporation to a Registration Statement(s) and any amendments thereto to be
filed with the Securities and Exchange Commission under the Securities Act of
1933, covering the issue of Common Stock under the dividend reinvestment and
stock purchase plan, stock incentive plan, and savings investment plans, as
authorized by the Company's Board of Directors on December 17, 1997, and, for
the performance of the same acts, each with power to appoint in their place and
stead and as their substitute, one or more attorneys-in-fact for the
undersigned, with full power of revocation; hereby ratifying and confirming all
that said attorneys-in-fact may do by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 23rd day of December, 1997.



                                                 Charles W. Mueller       (L.S.)
                                              ----------------------------------


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


         On this 23rd day of December, 1997, before me the undersigned Notary
Public in and for said State, personally appeared Charles W. Mueller, known to
me to be the person described in and who executed the foregoing power of
attorney and acknowledged to me that he executed the same as his free act and
deed for the purposes therein stated.

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



                                                 Barbara Lungwitz
                                              ----------------------------------




<PAGE>   2



                                                                     EXHIBIT 24



                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Donald E. Brandt
hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or James C.
Thompson the true and lawful attorneys-in-fact of the undersigned, for and in
the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to a Registration Statement(s)
and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Act of 1933, covering the issue of Common Stock
under the dividend reinvestment and stock purchase plan, stock incentive plan,
and savings investment plans, as authorized by the Company's Board of Directors
on December 17, 1997, and, for the performance of the same acts, each with power
to appoint in their place and stead and as their substitute, one or more
attorneys-in-fact for the undersigned, with full power of revocation; hereby
ratifying and confirming all that said attorneys-in-fact may do by virtue
hereof.
         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 23rd day of December, 1997.





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

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


         On this 23rd day of December, 1997, before me the undersigned Notary
Public in and for said State, personally appeared December, known to me to be
the person described in and who executed the foregoing power of attorney and
acknowledged to me that he executed the same as his free act and deed for the
purposes therein stated.

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




                                                 Barbara Lungwitz
                                              ----------------------------------





<PAGE>   3



                                                                   EXHIBIT 24



                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Clifford L.
Greenwalt hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or
James C. Thompson the true and lawful attorneys-in-fact of the undersigned, for
and in the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to a Registration Statement(s)
and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Act of 1933, covering the issue of Common Stock
under the dividend reinvestment and stock purchase plan, stock incentive plan,
and savings investment plans, as authorized by the Company's Board of Directors
on December 17, 1997, and, for the performance of the same acts, each with power
to appoint in their place and stead and as their substitute, one or more
attorneys-in-fact for the undersigned, with full power of revocation; hereby
ratifying and confirming all that said attorneys-in-fact may do by virtue
hereof.
         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 31st day of December, 1997.





                                                 Clifford L. Greenwalt    (L.S.)
                                              ----------------------------------



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


         On this 31st day of December, 1997, before me the undersigned Notary
Public in and for said State, personally appeared December, known to me to be
the person described in and who executed the foregoing power of attorney and
acknowledged to me that he executed the same as his free act and deed for the
purposes therein stated.

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




                                                 Barbara Lungwitz
                                              ----------------------------------





<PAGE>   4



                                                                    EXHIBIT 24



                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned William E.
Cornelius hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or
James C. Thompson the true and lawful attorneys-in-fact of the undersigned, for
and in the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to a Registration Statement(s)
and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Act of 1933, covering the issue of Common Stock
under the dividend reinvestment and stock purchase plan, stock incentive plan,
and savings investment plans, as authorized by the Company's Board of Directors
on December 17, 1997, and, for the performance of the same acts, each with power
to appoint in their place and stead and as their substitute, one or more
attorneys-in-fact for the undersigned, with full power of revocation; hereby
ratifying and confirming all that said attorneys-in-fact may do by virtue
hereof.
         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 19th day of December, 1997.





                                               William E. Cornelius       (L.S.)
                                              ----------------------------------




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


         On this 19th day of December, 1997, before me the undersigned Notary
Public in and for said State, personally appeared December, known to me to be
the person described in and who executed the foregoing power of attorney and
acknowledged to me that he executed the same as his free act and deed for the
purposes therein stated.

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




                                                 Barbara Lungwitz
                                              ----------------------------------






<PAGE>   5



                                                                     EXHIBIT 24



                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Thomas A. Hays
hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or James C.
Thompson the true and lawful attorneys-in-fact of the undersigned, for and in
the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to a Registration Statement(s)
and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Act of 1933, covering the issue of Common Stock
under the dividend reinvestment and stock purchase plan, stock incentive plan,
and savings investment plans, as authorized by the Company's Board of Directors
on December 17, 1997, and, for the performance of the same acts, each with power
to appoint in their place and stead and as their substitute, one or more
attorneys-in-fact for the undersigned, with full power of revocation; hereby
ratifying and confirming all that said attorneys-in-fact may do by virtue
hereof.
         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 20th day of December, 1997.





                                                  Thomas A. Hays          (L.S.)
                                              ----------------------------------




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


         On this 20th day of December, 1997, before me the undersigned Notary
Public in and for said State, personally appeared December, known to me to be
the person described in and who executed the foregoing power of attorney and
acknowledged to me that he executed the same as his free act and deed for the
purposes therein stated.

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




                                                 Barbara Lungwitz
                                              ----------------------------------






<PAGE>   6



                                                                     EXHIBIT 24



                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Richard A. Liddy
hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or James C.
Thompson the true and lawful attorneys-in-fact of the undersigned, for and in
the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to a Registration Statement(s)
and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Act of 1933, covering the issue of Common Stock
under the dividend reinvestment and stock purchase plan, stock incentive plan,
and savings investment plans, as authorized by the Company's Board of Directors
on December 17, 1997, and, for the performance of the same acts, each with power
to appoint in their place and stead and as their substitute, one or more
attorneys-in-fact for the undersigned, with full power of revocation; hereby
ratifying and confirming all that said attorneys-in-fact may do by virtue
hereof.
         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 23rd day of December, 1997.





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




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


         On this 23rd day of December, 1997, before me the undersigned Notary
Public in and for said State, personally appeared December, known to me to be
the person described in and who executed the foregoing power of attorney and
acknowledged to me that he executed the same as his free act and deed for the
purposes therein stated.

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




                                                 Barbara Lungwitz
                                              ----------------------------------





<PAGE>   7



                                                                     EXHIBIT 24



                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Richard A. Lumpkin
hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or James C.
Thompson the true and lawful attorneys-in-fact of the undersigned, for and in
the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to a Registration Statement(s)
and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Act of 1933, covering the issue of Common Stock
under the dividend reinvestment and stock purchase plan, stock incentive plan,
and savings investment plans, as authorized by the Company's Board of Directors
on December 17, 1997, and, for the performance of the same acts, each with power
to appoint in their place and stead and as their substitute, one or more
attorneys-in-fact for the undersigned, with full power of revocation; hereby
ratifying and confirming all that said attorneys-in-fact may do by virtue
hereof.
         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 31st day of December, 1997.





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




STATE OF ILLINOIS              )
                               )  SS.
CITY OF MATTOON                )


         On this 31st day of December, 1997, before me the undersigned Notary
Public in and for said State, personally appeared December, known to me to be
the person described in and who executed the foregoing power of attorney and
acknowledged to me that he executed the same as his free act and deed for the
purposes therein stated.

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




                                                    Renee Spitz
                                              ----------------------------------
                                                




<PAGE>   8



                                                                     EXHIBIT 24



                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned John Peters
MacCarthy hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or
James C. Thompson the true and lawful attorneys-in-fact of the undersigned, for
and in the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to a Registration Statement(s)
and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Act of 1933, covering the issue of Common Stock
under the dividend reinvestment and stock purchase plan, stock incentive plan,
and savings investment plans, as authorized by the Company's Board of Directors
on December 17, 1997, and, for the performance of the same acts, each with power
to appoint in their place and stead and as their substitute, one or more
attorneys-in-fact for the undersigned, with full power of revocation; hereby
ratifying and confirming all that said attorneys-in-fact may do by virtue
hereof.
         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 19th day of December, 1997.





                                               John Peters MacCarthy      (L.S.)
                                              ----------------------------------




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


         On this 19th day of December, 1997, before me the undersigned Notary
Public in and for said State, personally appeared December, known to me to be
the person described in and who executed the foregoing power of attorney and
acknowledged to me that he executed the same as his free act and deed for the
purposes therein stated.

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




                                                 Barbara Lungwitz
                                              ----------------------------------




<PAGE>   9



                                                                    EXHIBIT 24



                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Paul L. Miller
hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or James C.
Thompson the true and lawful attorneys-in-fact of the undersigned, for and in
the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to a Registration Statement(s)
and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Act of 1933, covering the issue of Common Stock
under the dividend reinvestment and stock purchase plan, stock incentive plan,
and savings investment plans, as authorized by the Company's Board of Directors
on December 17, 1997, and, for the performance of the same acts, each with power
to appoint in their place and stead and as their substitute, one or more
attorneys-in-fact for the undersigned, with full power of revocation; hereby
ratifying and confirming all that said attorneys-in-fact may do by virtue
hereof.
         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 31st day of December, 1997.





                                                  Paul L. Miller          (L.S.)
                                              ----------------------------------




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


         On this 31st day of December, 1997, before me the undersigned Notary
Public in and for said State, personally appeared December, known to me to be
the person described in and who executed the foregoing power of attorney and
acknowledged to me that he executed the same as his free act and deed for the
purposes therein stated.

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




                                                 Barbara Lungwitz
                                              ----------------------------------





<PAGE>   10



                                                                    EXHIBIT 24



                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Robert H. Quenon
hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or James C.
Thompson the true and lawful attorneys-in-fact of the undersigned, for and in
the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to a Registration Statement(s)
and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Act of 1933, covering the issue of Common Stock
under the dividend reinvestment and stock purchase plan, stock incentive plan,
and savings investment plans, as authorized by the Company's Board of Directors
on December 17, 1997, and, for the performance of the same acts, each with power
to appoint in their place and stead and as their substitute, one or more
attorneys-in-fact for the undersigned, with full power of revocation; hereby
ratifying and confirming all that said attorneys-in-fact may do by virtue
hereof.
         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 24th day of December, 1997.





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




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


         On this 24th day of December, 1997, before me the undersigned Notary
Public in and for said State, personally appeared December, known to me to be
the person described in and who executed the foregoing power of attorney and
acknowledged to me that he executed the same as his free act and deed for the
purposes therein stated.

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




                                                 Barbara Lungwitz
                                              ----------------------------------






<PAGE>   11



                                                                     EXHIBIT 24



                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Harvey Saligman
hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or James C.
Thompson the true and lawful attorneys-in-fact of the undersigned, for and in
the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to a Registration Statement(s)
and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Act of 1933, covering the issue of Common Stock
under the dividend reinvestment and stock purchase plan, stock incentive plan,
and savings investment plans, as authorized by the Company's Board of Directors
on December 17, 1997, and, for the performance of the same acts, each with power
to appoint in their place and stead and as their substitute, one or more
attorneys-in-fact for the undersigned, with full power of revocation; hereby
ratifying and confirming all that said attorneys-in-fact may do by virtue
hereof.
         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 23rd day of December, 1997.





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




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


         On this 23rd day of December, 1997, before me the undersigned Notary
Public in and for said State, personally appeared December, known to me to be
the person described in and who executed the foregoing power of attorney and
acknowledged to me that he executed the same as his free act and deed for the
purposes therein stated.

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




                                                 Barbara Lungwitz
                                              ----------------------------------






<PAGE>   12



                                                                     EXHIBIT 24



                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Charles J. Schukai
hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or James C.
Thompson the true and lawful attorneys-in-fact of the undersigned, for and in
the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to a Registration Statement(s)
and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Act of 1933, covering the issue of Common Stock
under the dividend reinvestment and stock purchase plan, stock incentive plan,
and savings investment plans, as authorized by the Company's Board of Directors
on December 17, 1997, and, for the performance of the same acts, each with power
to appoint in their place and stead and as their substitute, one or more
attorneys-in-fact for the undersigned, with full power of revocation; hereby
ratifying and confirming all that said attorneys-in-fact may do by virtue
hereof.
         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 23rd day of December, 1997.





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




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


         On this 23rd day of December, 1997, before me the undersigned Notary
Public in and for said State, personally appeared December, known to me to be
the person described in and who executed the foregoing power of attorney and
acknowledged to me that he executed the same as his free act and deed for the
purposes therein stated.

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




                                                 Barbara Lungwitz
                                              ----------------------------------





<PAGE>   13


                                                                     EXHIBIT 24



                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS: That the undersigned Janet McAfee
Weakley hereby appoints Charles W. Mueller and/or Donald E. Brandt and/or James
C. Thompson the true and lawful attorneys-in-fact of the undersigned, for and in
the name, place and stead of the undersigned, to affix the name of the
undersigned as a Director of Ameren Corporation to a Registration Statement(s)
and any amendments thereto to be filed with the Securities and Exchange
Commission under the Securities Act of 1933, covering the issue of Common Stock
under the dividend reinvestment and stock purchase plan, stock incentive plan,
and savings investment plans, as authorized by the Company's Board of Directors
on December 17, 1997, and, for the performance of the same acts, each with power
to appoint in their place and stead and as their substitute, one or more
attorneys-in-fact for the undersigned, with full power of revocation; hereby
ratifying and confirming all that said attorneys-in-fact may do by virtue
hereof.
         IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal
this 19th day of December, 1997.





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




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


         On this 19th day of December, 1997, before me the undersigned Notary
Public in and for said State, personally appeared December, known to me to be
the person described in and who executed the foregoing power of attorney and
acknowledged to me that he executed the same as his free act and deed for the
purposes therein stated.

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




                                               Kathleen D. O'Reilly
                                              ----------------------------------




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