AMEREN CORP
U5S, 2000-04-28
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549







                                    FORM U5S








                                  ANNUAL REPORT

                      For the Year Ended December 31, 1999






       Filed pursuant to the Public Utility Holding Company Act of 1935 by










                               AMEREN CORPORATION
                 1901 Chouteau Avenue, St. Louis, Missouri 63103


<PAGE>

<TABLE>
<CAPTION>

                                TABLE OF CONTENTS

                                                                                                              Page

<S>                                                                                                         <C>
ITEM 1.   SYSTEM COMPANIES AND INVESTMENTS THEREIN AS OF DECEMBER 31, 1998                                     1

ITEM 2.   ACQUISITIONS OR SALES OF UTILITY ASSETS                                                             10

ITEM 3.   ISSUE, SALE, PLEDGE, GUARANTEE OR ASSUMPTION OF SYSTEM SECURITIES                                   10

ITEM 4.   ACQUISITION, REDEMPTION OR RETIREMENT OF SYSTEM SECURITIES                                          10

ITEM 5.   INVESTMENTS IN SECURITIES OF NON-SYSTEM COMPANIES                                                   10

ITEM 6.   OFFICERS AND DIRECTORS

          Part I.   Name, principal business address and positions held as of December 31, 1999               10

          Part II.  Financial connections as of December 31, 1999                                             19

          Part III. Compensation and other related information                                                20

ITEM 7.   CONTRIBUTIONS AND PUBLIC RELATIONS                                                                  20

ITEM 8.   SERVICE, SALES AND CONSTRUCTION CONTRACTS

          Part I.   Intercompany sales and service                                                            20

          Part II.  Contracts to purchase services or goods between any system company                        20
                      and affiliate

          Part III. Employment of any person by any system company for the performance                        20
                      on a continuing basis of management services

ITEM 9.    WHOLESALE GENERATORS AND FOREIGN UTILITY COMPANIES                                                 21

ITEM 10.   FINANCIAL STATEMENTS AND EXHIBITS

     Index to Financial Statements                                                                            21

     Financial Statement                                                                              Appendix B

     Exhibits                                                                                                 22

SIGNATURES                                                                                                    24

</TABLE>


<PAGE>


ITEM 1.  SYSTEM COMPANIES AND INVESTMENTS THEREIN AS OF DECEMBER 31, 1999.

<TABLE>
<CAPTION>

                                                 Number of
                                                  Common        % of       Issuer              Owner's
                                                  Shares       Voting      Book                 Book
        Name of Company                           Owned        Power       Value                Value          Business Type
        ---------------                           -----        -----       -----                -----          -------------

<S>                                             <C>           <C>         <C>               <C>
Ameren Corporation                                                          3,089,545,688     3,089,545,688   Holding Company

     Union Electric Co.                          102,123,834                2,433,682,282     2,433,682,282   Electric & Gas Utility

              Envirotech Investment                                          (1)                              Energy-Related
              Fund, L.L.C.

         Electric Energy, Inc.                        24,800                8,834,469             3,533,787   Electric

         Union Electric Development Corp.             18,500              (18,834,958)          (18,834,958)  Community Develop-
                                                                                                              ment & Energy-Related
                                                                                                              Investments

              Civic Ventures                                                 (2)                              Community
              Investment Fund, LP                                                                             Development

              Lewis & Clark Industrial                                       (3)                              Community
              Development Corporation                                                                         Development

              Laclede's Landing                                              (4)                              Community
              Redevelopment Corp.                                                                             Development

              Gateway National Bank                                          (5)                              Community
                                                                                                              Development

              NEMO Bank Community                                            (6)                              Community
              Development Corporation                                                                         Development

              St. Louis Equity Fund 1988                                     (7)                              Community
                                                                                                              Development

              St. Louis Equity Fund 1990                                     (7)                              Community
                                                                                                              Development

                                      -1-

<PAGE>

                                                 Number of
                                                  Common       % of        Issuer             Owner's
                                                  Shares      Voting       Book                 Book
        Name of Company                           Owned       Power        Value                Value         Business Type
        ---------------                           -----       -----        -----                -----         -------------

              St. Louis Equity Fund 1991                                     (7)                              Community
                                                                                                              Development

              St. Louis Equity Fund 1992                                     (7)                              Community
                                                                                                              Development

              St. Louis Equity Fund 1993                                     (7)                              Community
                                                                                                              Development

              St. Louis Equity Fund 1994                                     (7)                              Community
                                                                                                              Development

              St. Louis Equity Fund 1995                                     (7)                              Community
                                                                                                              Development

              St. Louis Equity Fund 1996                                     (7)                              Community
                                                                                                              Development

              St. Louis Equity Fund 1997                                     (7)                              Community
                                                                                                              Development

              St. Louis Equity Fund 1998                                     (7)                              Community
                                                                                                              Development

              St. Louis Equity Fund 1999 #1                                  (7)                              Community
                                                                                                              Development

              Housing Missouri, Inc.
                                                                                                              Community
                                                                                                              Development

                  Housing Missouri 1996                                      (8)                              Community
                                                                                                              Development

                  Housing Missouri 1997                                      (8)                              Community
                                                                                                              Development

                                      -2-

<PAGE>

                                                 Number of
                                                  Common       % of        Issuer             Owner's
                                                  Shares      Voting       Book                 Book
        Name of Company                           Owned       Power        Value                Value          Business Type
        ---------------                           -----       -----        -----                -----          -------------


                  Housing Missouri 1998                                      (8)                              Community
                                                                                                              Development

              Homestead Brookfield Housing                                   (9)                              Community
                                                                                                              Development

     Central Illinois Public Service Company      25,452,373              534,378,323           534,378,323   Electric & Gas

         Electric Energy, Inc.                        12,400                8,834,469             1,766,894   Electric

         *CIPS Energy, Inc.                              100                    1,000                 1,000   Inactive

     CIPSCO Investment Company                           100               11,044,488            11,044,488   Leasing and Energy-
                                                                                                              Related Investments

         CIPSCO Venture Company                          100                4,425,128             4,425,128   Civic and Economic
                                                                                                              Development

              Effingham Development                            (10)                                           Investments
              Building II, LLC

              Mattoon Enterprise Park LLC                      (11)                                           Investments

              MACC, LLC                                        (12)                                           Investments

              Illinois Equity Fund 1992                        (13)                                           Investments

              Illinois Equity Fund 1994                        (13)                                           Investments

              Illinois Equity Fund 1996                        (13)                                           Investments

              Illinois Equity Fund 1998                        (13)                                           Investments


                                      -3-

<PAGE>

                                                 Number of
                                                  Common       % of        Issuer              Owner's
                                                  Shares      Voting       Book                 Book
        Name of Company                           Owned       Power        Value                Value          Business Type
        ---------------                           -----       -----        -----                -----          -------------

              Illinois Equity Fund 1999 #2                       (13)                                         Investments

              St. Louis Equity Fund 1999 #1                      (13)                                         Investments

         CIPSCO Leasing Company                        100       (14)      35,202,658          35,202,658     Leveraged Leases

              CLC Aircraft Leasing Co.                 100       (15)                                         Equipment Leasing

              CLC Leasing Co. A                        100       (16)                                         Equipment Leasing

              CLC Leasing Co. B                        100       (17)                                         Equipment Leasing

              CLC Leasing Co. C                        100       (18)                                         Inactive

         CIPSCO Energy Company                         100                 26,491,934         26,491,934      Energy-Related
                                                                                                              Investments

              CEC-APL L.P.                                                   (19)                             Investments

                  CEC-APL-G Co.                        100       (19)                                         quipment Leasing

                  CEC-APL-L Co.                        100       (19)                                         quipment Leasing

              CEC-PGE L.P.                                                   (20)                             Investments

                  CEC-PGE-G Co.                        100       (20)                                         Equipment Leasing

                  CEC-PGE-L Co.                        100       (20)                                         Equipment Leasing

              CEC-PSPL L.P.                                                  (21)                             Investments

                  CEC-PSPL-G Co.                       100       (21)                                         Equipment Leasing

                  CEC-PSPL-L Co.                       100       (21)                                         Equipment Leasing

                                      -4-


<PAGE>

                                                 Number of
                                                  Common       % of        Issuer             Owner's
                                                  Shares      Voting       Book                 Book
        Name of Company                           Owned       Power        Value                Value          Business Type
        ---------------                           -----       -----        -----                -----          -------------

              CEC-MPS L.P.                                                   (22)                             Investments

                  CEC-MPS-G Co.                        100      (22)                                          Equipment Leasing

                  CEC-MPS-L Co.                        100      (22)                                          Equipment Leasing

              CEC-ACE L.P.                                                   (23)                             Investments

                  CEC-ACE-G Co.                        100      (23)                                          Equipment Leasing

                  CEC-ACE-L Co.                        100      (23)                                          Equipment Leasing

              CEC-ACLP-Co.                             100      (24)                                          Investments

     Ameren Energy, Inc.                                 1                 (6,794,425)        (6,794,425)     Power & Gas
                                                                                                              Marketing,
                                                                                                              Energy-Related

     Ameren Services Co.                             1,000                 16,231,478         16,231,478      Services to Ameren
                                                                                                              and its affiliates

     Ameren Development Company                      1,000                 (1,353,753)        (1,353,753)     Holding Company

         Ameren ERC, Inc.                            1,000                 (1,353,651)        (1,353,651)     Energy-Related

              Gateway Energy Systems, L.C.
              and affiliates                                                 (25)                             Energy-Related

         Ameren Energy Communications, Inc.          1,000                 (8,530,923)        (8,530,923)     Communications-
                                                                                                              Related

              CellNet Data Systems                 536,193                    761,394            761,394      Wireless Data
                                                                                                              Communication

     Ameren Energy Resources Company #3              1,000                   (202,679)          (202,679)     Holding Company

                                      -5-

<PAGE>


                                             NOTES RELATING TO VOTING POWER AND BOOK VALUE

Union Electric Company

  (1)  Envirotech Investment Fund, L.L.C.
           Capital   investments  in  energy-related   businesses  with  Company
contributions amounting to $1,920,000 as of 12/31/99.


Union Electric Development Corporation

  (2)  Civic Ventures Investment Fund, LP
           Investment  fund to  promote  growth  and  development  of small  and
           minority business enterprises with Company contributions amounting to
           $178,200 as of 12/31/99.

  (3)  Lewis and Clark Industrial Development Corporation
           Capital contribution in civic development as of 12/31/99 of $5,000.

  (4)  Laclede's Landing Redevelopment Corporation
           Capital contribution in civic development as of 12/31/99 of $10,000.

  (5)  Gateway National Bank
           Capital contribution in civic development as of 12/31/99 of $60,000.

  (6)  NEMO Bank Community Development Corporation
           Capital contribution in civic development as of 12/31/99 of $1,000.

  (7) St. Louis Equity Funds - 1988,  1990,  1991, 1992, 1993, 1994, 1995, 1996,
1997, 1998 and 1999.
           Real estate investment funds, with the Company's total  contributions
           as of 12/31/99  of  $6,259,120.41.  Includes  purchase of tax credits
           from  Mercantile  Community   Development   Corporation  and  Federal
           National Mortgage Association. No established market value.

  (8)  Housing Missouri Funds - 1996, 1997 and 1998
           Real estate  investment funds with the Company's total  contributions
           as of 12/31/99 of $273,402.63. No established market value.

  (9)  Homestead Brookfield Housing
           Capital contribution for economic development  amounting to $1,500 as
of 12/31/99.

                                      -6-

<PAGE>


CIPSCO Venture Company holdings:

Total equity  interest in the  investments  listed below,  except for the Equity
Funds as provided separately below, is $924,867:

 (10)  Effingham Development Building II LLC
           A 40% equity  interest,  but not the  managing  member,  in the above
           named limited liability company. No established market value.

 (11)  Mattoon Enterprise Park, LLC
           A 20% equity  interest,  but not the  managing  member,  in the above
           named limited liability company. No established market value.

 (12)  MACC, LLC
           A 33.33% interest,  but not the managing  member,  in the above named
limited liability company. No established market value.

 (13)      Illinois  Equity  Funds - 1992,  1994,  1996,  1998 and 1999  Limited
           Partnerships  and St.  Louis  Equity Fund 1999 LLC Various  ownership
           interests of not more than 10% in various limited partnerships. Total
           commitment  to  all  limited   partnerships   of  $4.0  million.   No
           established market value, book value is $3,500,261. Includes purchase
           of tax credits from Mercantile Community Development Corporation.


CIPSCO Leasing Company

Total current asset book value of investments listed below is $35,285,741:

 (14)  A 17.5%  undivided  interest in a leveraged  lease financing of a natural
       gas  liquids  plant  held  under the  subsidiary  name of CIPSCO  Leasing
       Company.

 (15)  A 100% interest in a leveraged lease  financing of a commercial  aircraft
       held under the subsidiary name CIPSCO Aircraft Leasing Company.

 (16)  A 25% undivided  interest in a leveraged  lease  financing of various oil
       and gas production  equipment held under the subsidiary  name CLC Leasing
       Company A.

 (17)  A 100%  interest in a leveraged  lease  financing  of certain  commercial
       properties held under the subsidiary name CLC Leasing Company B.

 (18) CLC Leasing Company C established for future investment opportunities;  no
current investments.

                                      -7-

<PAGE>


CIPSCO Energy Company

Total current asset book value of investments listed below is $26,491,934:

 (19)  CEC-APL, LP
           A 51%  limited  partnership  interest  in  the  above  named  Limited
           Partnership.  1% and 50% of this  investment  are  held in  CEC-APL-G
           Company and CEC-APL-L  Company,  respectively - both  subsidiaries of
           CIPSCO Energy Company. No established market value.

 (20)  CEC-PGE, LP
           Asset was sold in 1999 and currently the partnership has no market or
book value.

(21)   CEC-PSPL, LP
           A 51%  limited  partnership  interest  in  the  above  named  Limited
           Partnership.  1% and 50% of this  investment  are held in  CEC-PSPL-G
           Company and CEC-PSPL-L  Company,  respectively - both subsidiaries of
           CIPSCO Energy Company. No established market value.

 (22)  CEC-MPS, LP
           A 100%  limited  partnership  interest  in the  above  named  Limited
           Partnership.  1% and 99% of this investment are held in CEC-MPS-G and
           CEC-MPS-L Company,  respectively - both subsidiaries of CIPSCO Energy
           Company. No established market value.

 (23)  CEC-ACE, LP
           A 100%  limited  partnership  interest  in the  above  named  Limited
           Partnership.  1% and 99% of this  investment  are  held in  CEC-ACE-G
           Company and CEC-ACE-L Company,  respectively,  - both subsidiaries of
           CIPSCO Energy Company. No established market value.

 (24)  Appomattox Cogeneration L.P.
           A 24.75%  limited  partnership  interest in the above  named  Limited
           Partnership.   This  investment  is  held  in  CEC-ACLP  Company,   a
           subsidiary of CIPSCO Energy Company. No established market value.


Ameren ERC, Inc.

 (25)  Gateway Energy Systems, LLC and affiliates
           A 49% interest in the above named Limited Liability Company amounting
to $2,600,847.98 as of 12/31/99.

                                      -8-

<PAGE>


                                    FOOTNOTES

#1   St.  Louis  Equity  Fund  1999 is the 1999  commitment  to the real  estate
     investment fund.

#2   Illinois  Equity  Fund  1999 is the  1999  commitment  to the  real  estate
     investment fund.

#3   Ameren Energy  Resources  Company was incorporated in Illinois on September
     3,  1999  as a  nonregulated  Illinois  holding  company  for  an  Illinois
     nonregulated subsidiary and its marketing affiliate.

</TABLE>

                                      -9-

<PAGE>


ITEM 2.  ACQUISITIONS OR SALES OF UTILITY ASSETS

No sales that require reporting.


ITEM 3.  ISSUE, SALE, PLEDGE, GUARANTEE OR ASSUMPTION OF SYSTEM SECURITIES

A.   Ameren Corporation - Guarantees

     1.   The  registrant  and  its  utility  affiliates  are  self-insured  for
          Worker's  Compensation  Insurance and the Parent (Ameren  Corporation)
          guarantees  the payment of  outstanding  claims of  subsidiaries  (the
          "Reserve").  At 12/31/99  the  Reserve  amounted  to  $3,985,281.  The
          highest  amount  outstanding  at any time  during  the year  cannot be
          readily determined.


ITEM 4.  ACQUISITION, REDEMPTION OR RETIREMENT OF SYSTEM SECURITIES

A.   Union Electric Company - Debt Retirements

     1.   On October 15, 1999,  this system  company  retired,  with cash,  upon
          maturity its $100 million principal amount 6.75% First Mortgage Bonds.

B.   Central Illinois Public Serice Company - Debt Retirements

     1.   On January 22, 1999,  this system  company  redeemed prior to maturity
          its $33 million principal amount 8.50% First Mortgage Bonds Seriew W.

     2.   On March 15,  1999,  this  system  company  retired,  with cash,  upon
          maturity its $5 million  principal  amount 6.52% First Mortgage Bonds,
          Medium-Term Note Series 1997-1.

     3.   On May 15, 1999, this system company retired, with cash, upon maturity
          its $50 million principal amount 7-1/8% First Mortgage Bonds Series W.

     4.   On September 15, 1999,  this system company  retired,  with cash, upon
          maturity its $5 million  principal  amount 6.60% First Mortgage Bonds,
          Medium-Term Note Series 1997-1.


ITEM 5.  INVESTMENTS IN SECURITIES OF NON-SYSTEM COMPANIES

None.


ITEM 6.  OFFICERS AND DIRECTORS - PART l.

The  positions of officers  and director of all system  companies as of December
31, 1999 were as follows:

NAME AND ADDRESS                                                  POSITION

AMEREN CORPORATION

WARNER L. BAXTER                           ST. LOUIS, MO           VP & C
JERRE E. BIRDSONG                          ST. LOUIS, MO           T
DONALD E. BRANDT                           ST. LOUIS, MO           SVP
WILLIAM E. CORNELIUS                       ST. LOUIS, MO           D
CLIFFORD L. GREENWALT                      SPRINGFIELD, IL         D

                                      -10-

<PAGE>

NAME AND ADDRESS                                                   POSITION

AMEREN CORPORATION (CONTINUED)

THOMAS A. HAYS                             ST. LOUIS, MO           D
RICHARD A. LIDDY                           ST. LOUIS, MO           D
GORDON R. LOHMAN                           CHICAGO, IL             D
RICHARD A. LUMPKIN                         MATTOON, IL             D
JOHN PETERS MACCARTHY                      ST. LOUIS, MO           D
HANNE M. MERRIMAN                          WASHINGTON, DC          D
PAUL L. MILLER, JR.                        ST. LOUIS, MO           D
CHARLES W. MUELLER                         ST. LOUIS, MO           D,CM, P & CEO
ROBERT H. QUENON                           ST. LOUIS, MO           D
HARVEY SALIGMAN                            ST. LOUIS, MO           D
CHARLES J. SCHUKAI (1)                     ST. LOUIS, MO           D
STEVEN R. SULLIVAN                         ST. LOUIS, MO           VP,GC & S
JANET MCAFEE WEAKLEY                       ST. LOUIS, MO           D
JAMES W. WOGSLAND                          HAYDEN LAKE, ID         D

(1) Mr. Schukai retired on June 1, 1999.


UNION ELECTRIC COMPANY

PAUL A. AGATHEN                            ST. LOUIS, MO           D
WARNER L. BAXTER                           ST. LOUIS, MO           VP & C
JERRE E. BIRDSONG                          ST. LOUIS, MO           T
DONALD E. BRANDT                           ST. LOUIS, MO           D & SVP
WILLIAM J. CARR                            ST. LOUIS, MO           VP
DANIEL F. COLE                             ST. LOUIS, MO           SVP
MICHAEL J. MONTANA                         ST. LOUIS, MO           VP
CHARLES W. MUELLER                         ST. LOUIS, MO           D, P & CEO
CHARLES D. NASLUND                         ST. LOUIS, MO           VP
GARY L. RAINWATER                          SPRINGFIELD, IL         D
GARRY L. RANDOLPH                          ST. LOUIS, MO           VP
CHARLES J. SCHUKAI (1)                     ST. LOUIS, MO           D & SVP
ROBERT J. SCHUKAI (2)                      ST. LOUIS, MO           VP
WILLIAM C. SHORES                          ST. LOUIS, MO           VP
STEVEN R. SULLIVAN                         ST. LOUIS, MO           VP,GC & S

(1) Mr. C. Schukai retired June 1, 1999.
(2) Mr. R. Schukai retired on February 1, 1999.


ELECTRIC ENERGY, INC.

DONALD W. CAPONE                           ST. LOUIS, MO           D
ALEC G. DREYER                             DECATUR, IL             D
JAMES M. HELM                              JOPPA, IL               S
R. ALAN KELLEY                             ST. LOUIS, MO           D & P
WAYNE T. LUCAS                             LOUISVILLE, KY          D
GILBERT W. MOORMAN                         SPRINGFIELD, IL         D
CHARLES W. MUELLER                         ST. LOUIS, MO           D
ROBERT L. POWERS                           JOPPA, IL               VP
JOHN D. PRUNKL                             DECATUR, IL             D
GARY L. RAINWATER                          SPRINGFIELD, IL         D

                                      -11-

<PAGE>

NAME AND ADDRESS                                                   POSITION

UNION ELECTRIC DEVELOPMENT CORPORATION

PAUL A. AGATHEN                            ST. LOUIS, MO           D
JERRE E. BIRDSONG                          ST. LOUIS, MO           D,VP & T
DONALD E. BRANDT                           ST. LOUIS, MO           D,VP & C
CHARLES W. MUELLER                         ST. LOUIS, MO           D,P
STEVEN R. SULLIVAN                         ST. LOUIS, MO           D,VP & S


ST. LOUIS EQUITY FUND 1988, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
  1998, 1999

DONALD E. BRANDT                           ST. LOUIS, MO           CM


HOUSING MISSOURI, INC. 1996, 1997, 1998

JERRE E. BIRDSONG                          ST. LOUIS, MO           D


CENTRAL ILLINOIS PUBLIC SERVICE COMPANY

PAUL A. AGATHEN                            ST. LOUIS, MO           D
WARNER L. BAXTER                           ST. LOUIS, MO           C
JERRE E. BIRDSONG                          ST. LOUIS, MO           T
JAMES T. BIRKETT (1)                       SPRINGFIELD, IL         VP
DONALD E. BRANDT                           ST. LOUIS, MO           D
JOHN L. HEATH (2)                          PHOENIX, AZ             D
ROBERT W. JACKSON (2)                      SPRINGFIELD, IL         D
MICHAEL J. MONTANA                         ST. LOUIS, MO           VP
GILBERT W. MOORMAN                         SPRINGFIELD, IL         VP
CHARLES W. MUELLER                         ST. LOUIS, MO           D
CRAIG D. NELSON                            ST. LOUIS, MO           VP
GARY L. RAINWATER                          SPRINGFIELD, IL         D,P & CEO
CHARLES J. SCHUKAI (3)                     ST. LOUIS, MO           D
THOMAS L. SHADE (2)                        QUINCY, IL              D
STEVEN R. SULLIVAN                         ST. LOUIS, MO           VP,GC & S
THOMAS R. VOSS                             SPRINGFIELD, IL         SVP

(1) Mr. Birkett retired on June 1, 1999.
(2) Term ended April 27, 1999.
(3) Mr. Schukai retired on June 1, 1999.


CIPS ENERGY, INC.

GARY L. RAINWATER                          SPRINGFIELD, IL         D & P

                                      -12-

<PAGE>

NAME AND ADDRESS                                                   POSITION

CIPSCO INVESTMENT COMPANY

WARNER L. BAXTER                           ST. LOUIS, MO           C
JERRE E. BIRDSONG                          ST. LOUIS, MO           D,PEO,P,T
DONALD E. BRANDT                           ST. LOUIS, MO           D
ROBERT C. PORTER                           ST. LOUIS, MO           D,VP
STEVEN R. SULLIVAN                         ST. LOUIS, MO           S


CIPSCO SECURITIES COMPANY

WARNER L. BAXTER                           ST. LOUIS, MO           C
JERRE E. BIRDSONG                          ST. LOUIS, MO           D,PEO,P,T
DONALD E. BRANDT                           ST. LOUIS, MO           D
ROBERT C. PORTER                           ST. LOUIS, MO           D,VP
STEVEN R. SULLIVAN                         ST. LOUIS, MO           S


CIPSCO VENTURE COMPANY

WARNER L. BAXTER                           ST. LOUIS, MO           C
JERRE E. BIRDSONG                          ST. LOUIS, MO           D,PEO,P,T
DONALD E. BRANDT                           ST. LOUIS, MO           D
ROBERT C. PORTER                           ST. LOUIS, MO           D,VP
STEVEN R. SULLIVAN                         ST. LOUIS, MO           S


EFFINGHAM DEVELOPMENT BUILDING II, LLC

ROBERT C. PORTER                           ST. LOUIS, MO           D


MATTOON ENTERPRISES PARK LLC

ROBERT C. PORTER                           ST. LOUIS, MO           D


MACC, LLC

ROBERT C. PORTER                           ST. LOUIS, MO           D


ILLINOIS EQUITY FUND 1992, 1994, 1996, 1998.

ROBERT C. PORTER                           ST. LOUIS, MO           D


CIPSCO LEASING COMPANY

WARNER L. BAXTER                           ST. LOUIS, MO           C
JERRE E. BIRDSONG                          ST. LOUIS, MO           D,PEO,P,T
DONALD E. BRANDT                           ST. LOUIS, MO           D
ROBERT C. PORTER                           ST. LOUIS, MO           D,VP
STEVEN R. SULLIVAN                         ST. LOUIS, MO           S

                                      -13-

<PAGE>

NAME AND ADDRESS                                                   POSITION

CLC AIRCRAFT LEASING CO.

WARNER L. BAXTER                           ST. LOUIS, MO           C
JERRE E. BIRDSONG                          ST. LOUIS, MO           D,PEO,P,T
DONALD E. BRANDT                           ST. LOUIS, MO           D
ROBERT C. PORTER                           ST. LOUIS, MO           D,VP
STEVEN R. SULLIVAN                         ST. LOUIS, MO           S


CLC LEASING CO. A

WARNER L. BAXTER                           ST. LOUIS, MO           C
JERRE E. BIRDSONG                          ST. LOUIS, MO           D,PEO,P,T
DONALD E. BRANDT                           ST. LOUIS, MO           D
ROBERT C. PORTER                           ST. LOUIS, MO           D,VP
STEVEN R. SULLIVAN                         ST. LOUIS, MO           S


CLC LEASING CO. B

WARNER L. BAXTER                           ST. LOUIS, MO           C
JERRE E. BIRDSONG                          ST. LOUIS, MO           D,PEO,P,T
DONALD E. BRANDT                           ST. LOUIS, MO           D
ROBERT C. PORTER                           ST. LOUIS, MO           D,VP
STEVEN R. SULLIVAN                         ST. LOUIS, MO           S


CLC LEASING CO. C

WARNER L. BAXTER                           ST. LOUIS, MO           C
JERRE E. BIRDSONG                          ST. LOUIS, MO           D,PEO,P,T
DONALD E. BRANDT                           ST. LOUIS, MO           D
ROBERT C. PORTER                           ST. LOUIS, MO           D,VP
STEVEN R. SULLIVAN                         ST. LOUIS, MO           S


CIPSCO ENERGY COMPANY

WARNER L. BAXTER                           ST. LOUIS, MO           C
JERRE E. BIRDSONG                          ST. LOUIS, MO           D,PEO,P,T
DONALD E. BRANDT                           ST. LOUIS, MO           D
ROBERT C. PORTER                           ST. LOUIS, MO           D,VP
STEVEN R. SULLIVAN                         ST. LOUIS, MO           S


CEC-APL-G CO.

WARNER L. BAXTER                           ST. LOUIS, MO           C
JERRE E. BIRDSONG                          ST. LOUIS, MO           D,PEO,P,T
DONALD E. BRANDT                           ST. LOUIS, MO           D
ROBERT C. PORTER                           ST. LOUIS, MO           D,VP
STEVEN R. SULLIVAN                         ST. LOUIS, MO           S

                                      -14-

<PAGE>

NAME AND ADDRESS                                                   POSITION

CEC-APL-L CO.

DIANE L. BORTMESS                          SPRINGFIELD, IL         D,T
RONALD K. EVANS                            ST. LOUIS, MO           D,S
JOY D. HUSTON                              ST. LOUIS, MO           D,C
GREGORY L. NELSON                          ST. LOUIS, MO           D,PEO,P


CEC-PGE-G CO.

WARNER L. BAXTER                           ST. LOUIS, MO           C
JERRE E. BIRDSONG                          ST. LOUIS, MO           D,PEO,P,T
DONALD E. BRANDT                           ST. LOUIS, MO           D
ROBERT C. PORTER                           ST. LOUIS, MO           D,VP
STEVEN R. SULLIVAN                         ST. LOUIS, MO           S


CEC-PGE-L CO.

DIANE L. BORTMESS                          SPRINGFIELD, IL         D,T
RONALD K. EVANS                            ST. LOUIS, MO           D,S
JOY D. HUSTON                              ST. LOUIS, MO           D,C
GREGORY L. NELSON                          ST. LOUIS, MO           D,PEO,P


CEC-PSPL-G CO.

WARNER L. BAXTER                           ST. LOUIS, MO           C
JERRE E. BIRDSONG                          ST. LOUIS, MO           D,PEO,P,T
DONALD E. BRANDT                           ST. LOUIS, MO           D
ROBERT C. PORTER                           ST. LOUIS, MO           D,VP
STEVEN R. SULLIVAN                         ST. LOUIS, MO           S


CEC-PSPL-L CO.

DIANE L. BORTMESS                          SPRINGFIELD, IL         D,T
RONALD K. EVANS                            ST. LOUIS, MO           D,S
JOY D. HUSTON                              ST. LOUIS, MO           D,C
GREGORY L. NELSON                          ST. LOUIS, MO           D,PEO,P


CEC-MPS-G CO.

WARNER L. BAXTER                           ST. LOUIS, MO           C
JERRE E. BIRDSONG                          ST. LOUIS, MO           D,PEO,P,T
DONALD E. BRANDT                           ST. LOUIS, MO           D
ROBERT C. PORTER                           ST. LOUIS, MO           D,VP
STEVEN R. SULLIVAN                         ST. LOUIS, MO           S

                                      -15-

<PAGE>

NAME AND ADDRESS                                                   POSITION

CEC-MPS-L CO.

DIANE L. BORTMESS                          SPRINGFIELD, IL         D,T
RONALD K. EVANS                            ST. LOUIS, MO           D,S
JOY D. HUSTON                              ST. LOUIS, MO           D,C
GREGORY L. NELSON                          ST. LOUIS, MO           D,PEO,P


CEC-ACE-G CO.

WARNER L. BAXTER                           ST. LOUIS, MO           C
JERRE E. BIRDSONG                          ST. LOUIS, MO           D,PEO,P,T
DONALD E. BRANDT                           ST. LOUIS, MO           D
ROBERT C. PORTER                           ST. LOUIS, MO           D,VP
STEVEN R. SULLIVAN                         ST. LOUIS, MO           S


CEC-ACE-L CO.

DIANE L. BORTMESS                          SPRINGFIELD, IL         D,T
RONALD K. EVANS                            ST. LOUIS, MO           D,S
JOY D. HUSTON                              ST. LOUIS, MO           D,C
GREGORY L. NELSON                          ST. LOUIS, MO           D,PEO,P


CEC-ACLP- CO.

WARNER L. BAXTER                           ST. LOUIS, MO           C
JERRE E. BIRDSONG                          ST. LOUIS, MO           D,PEO,P,T
DONALD E. BRANDT                           ST. LOUIS, MO           D
ROBERT C. PORTER                           ST. LOUIS, MO           D,VP
STEVEN R. SULLIVAN                         ST. LOUIS, MO           S


AMEREN ENERGY, INC.

PAUL A. AGATHEN                            ST. LOUIS, MO           D
DONALD E. BRANDT                           ST. LOUIS, MO           D
JERRE E. BIRDSONG                          ST. LOUIS, MO           T
BAXTER A. GILLETTE (1)                     ST. LOUIS, MO           VP
CLARENCE J. HOPF (2)                       ST. LOUIS, MO           VP
CHARLES W. MUELLER                         ST. LOUIS, MO           D
BRIAN RETTENMAIER (3)                      ST. LOUIS, MO           C
STEVEN R. SULLIVAN                         ST. LOUIS, MO           VP,GC & S
JAMES F. WHITESIDES (4)                    ST. LOUIS, MO           PEO,P

(1) Mr. Gillette was elected Vice President on August 16, 1999.
(2) Mr. Hopf was elected Vice President on June 14, 1999.
(3) Mr. Rettenmaier was appointed Controller on March 1, 1999.
(4) Mr. Whitesides was elected President on June 11, 1999.

                                      -16-

<PAGE>

NAME AND ADDRESS                                                  POSITION

AMEREN SERVICES CO.

PAUL A. AGATHEN                            ST. LOUIS, MO           SVP
M. PATRICIA BARRETT (1)                    ST. LOUIS, MO           VP
WARNER L. BAXTER                           ST. LOUIS, MO           VP,C
JERRE E. BIRDSONG                          ST. LOUIS, MO           T
DONALD E. BRANDT                           ST. LOUIS, MO           D,SVP
CHARLES A. BREMER                          ST. LOUIS, MO           VP
DONALD W. CAPONE                           ST. LOUIS, MO           VP
WILLIAM J. CARR (2)                        ST. LOUIS, MO           VP
DANIEL F. COLE (3)                         ST. LOUIS, MO           SVP
JIMMY L. DAVIS                             ST. LOUIS, MO           VP
JEAN M. HANNIS                             ST. LOUIS, MO           VP
R. ALAN KELLEY                             ST. LOUIS, MO           VP
MICHAEL J. MONTANA                         ST. LOUIS, MO           VP
CHARLES W. MUELLER                         ST. LOUIS, MO           D,P & CEO
CRAIG D. NELSON                            ST. LOUIS, MO           VP
GREGORY L. NELSON (4)                      ST. LOUIS, MO           VP
CHARLES J. SCHUKAI (5)                     ST. LOUIS, MO           D,SVP
J. KAY SMITH (6)                           ST. LOUIS, MO           VP
STEVEN R. SULLIVAN                         ST. LOUIS, MO           VP,GC & S
SAMUEL E. WILLIS                           ST. LOUIS, MO           VP
THOMAS R. VOSS (7)                         ST. LOUIS, MO           SVP

(1) Ms. Barrett retired July 1, 1999.
(2) Mr. Carr was elected Vice President on July 7, 1999.
(3) Mr. Cole was elected Senior Vice President on June 1, 1999.
(4) Mr. Nelson was elected Vice President on February 16, 1999.
(5) Mr. Schukai retired on June 1, 1999.
(6) Mrs. Smith was elected Vice President on July 1, 1999.
(7) Mr. Voss was elected Senior Vice President on June 1, 1999.


AMEREN DEVELOPMENT COMPANY

PAUL A. AGATHEN                                    ST. LOUIS, MO       SVP
JERRE E. BIRDSONG                                  ST. LOUIS, MO       T
DONALD E. BRANDT                                   ST. LOUIS, MO       D,SVP
CHARLES W. MUELLER                                 ST. LOUIS, MO       D,P
GARY L. RAINWATER (1)                              ST. LOUIS, MO       SVP
CHARLES J. SCHUKAI (2)                             ST. LOUIS, MO       D,SVP
STEVEN R. SULLIVAN                                 ST. LOUIS, MO       VP,GC & S

(1) Mr. Rainwater was elected Director and Senior Vice President on
    May 25, 1999.
(2) Mr. Schukai retired on June 1, 1999.


AMEREN ERC, INC.

PAUL A. AGATHEN                                    ST. LOUIS, MO       SVP
JERRE E. BIRDSONG                                  ST. LOUIS, MO       T
DONALD E. BRANDT                                   ST. LOUIS, MO       D, SVP
DANIEL F. COLE (1)                                 ST. LOUIS, MO       D, P
CHARLES W. MUELLER                                 ST. LOUIS, MO       D

                                      -17-

<PAGE>

NAME AND ADDRESS                                                      POSITION

AMEREN ERC, INC. (CONTINUED)

CHARLES J. SCHUKAI (2)                             ST. LOUIS, MO      D,P
STEVEN R. SULLIVAN                                 ST. LOUIS, MO      VP,GC & S

(1) Mr. Cole was elected Director and President on May 25, 1999.
(2) Mr. Schukai retired on June 1, 1999.


GATEWAY ENERGY SYSTEMS, L.C. AND AFFILIATES

DONALD E. BRANDT                                   ST. LOUIS, MO      D


AMEREN ENERGY COMMUNICATIONS, INC.

JERRE E. BIRDSONG                                  ST. LOUIS, MO      T
DONALD E. BRANDT                                   ST. LOUIS, MO      D
DANIEL F. COLE (1)                                 ST. LOUIS, MO      D, P
CHARLES W. MUELLER                                 ST. LOUIS, MO      D
CHARLES J. SCHUKAI (2)                             ST. LOUIS, MO      D, P
STEVEN R. SULLIVAN                                 ST. LOUIS, MO      S

(1) Mr. Cole was elected Director and President on May 25, 1999.
(2) Mr. Schukai retired on June 1, 1999.


AMEREN ENERGY RESOURCES COMPANY

PAUL A. AGATHEN                                    ST. LOUIS, MO      D
DONALD E. BRANDT                                   ST. LOUIS, MO      D
JERRE E. BIRDSONG                                  ST. LOUIS, MO      T
DANIEL F. COLE                                     ST. LOUIS, MO      D
CHARLES W. MUELLER                                 ST. LOUIS, MO      D
CHARLES D. NASLUND                                 ST. LOUIS, MO      D
GARY L. RAINWATER                                  ST. LOUIS, MO      D, P
STEVEN R. SULLIVAN                                 ST. LOUIS, MO      VP, GC & S


NOTE:  Positions are indicated above by the following symbols:

C       --    Controller
CEO     --    Chief Executive Officer
CM      --    Chairman
D       --    Director
GC      --    General Counsel
P       --    President
PEO     --    Principal Executive Officer
S       --    Secretary
SVP     --    Senior Vice President
T       --    Treasurer
VP      --    Vice President

                                      -18-

<PAGE>

ITEM 6.  OFFICERS AND DIRECTORS - PART ll.

Financial Connections - The following is a list, as of December 31, 1999, of all
officers and  directors of each system  company who have  financial  connections
within the provisions of Section 17(c) of the Public Utility Holding Company Act
of 1935.

<TABLE>
<CAPTION>

                                                                                  Position
                                                                                   Held in           Applicable
     Name of Officer                                                              Financial          Exemption
      or Director            Name and Location of Financial Institution          Institution           Rules
         (1)                                  (2)                                    (3)                (4)
     -----------------      ---------------------------------------------        ------------        ----------

                                                          AMEREN CORPORATION

<S>                        <C>                                                   <C>                <C>
Clifford L. Greenwalt       National City Corporation                             Director           Rule 70(b)
                            National City Bank of Michigan/Illinois

Richard A. Lumpkin          First Mid-Illinois Bancshares Inc.                    Director           Rule 70(a)
                            First Mid-Illinois Bank & Trust NA                    Director           Rule 70(a)

</TABLE>

                                      -19-

<PAGE>

ITEM 6.  OFFICERS AND DIRECTORS - PART III.

(a)  and (b)  Directors'  and  Executive  Officers'  Compensation  and  Security
     Interests.

Information  concerning  compensation and interests in system  securities is set
forth in Exhibits A-4, A-5 and A-6 to this Form U5S and is  incorporated  herein
by reference.


(c)  Directors' and Executive  Officers'  Contracts and Transactions with System
     Companies.

None.


(d)  Indebtedness of Directors or Executive Officers to System Companies.

None.


(e)  Directors'   and   Executive   Officers'   Participation   in   Bonus   and
     Profit-Sharing Arrangements and Other Benefits.

See Exhibits A-4, A-5 and A-6 for descriptions of the participation of directors
and  executive   officers  of  System  companies  in  bonus  and  profit-sharing
arrangements and other benefits.


(f)  Directors' and Executive Officers' rights to Indemnity.

The state laws under which each of the companies is incorporated provide broadly
for  indemnification  of directors and officers  against claims and  liabilities
against them in their  capacities as such.  Each of the  companies'  charters or
by-laws  also  provides  for  indemnification  of  directors  and  officers.  In
addition,  directors  and  executive  officers  of  Ameren  and  all  subsidiary
companies are insured under directors' and officers'  liability  policies issued
to Ameren,  et.  al. by Great  American  Insurance  Company,  Reliance  National
Insurance Company, Gulf Insurance Company and Executive Risk Indemnity, Inc. The
policies are for the period  January 1, 1998 to March 1, 2003.  The  Corporation
has  entered  into a  standard  form of  indemnity  agreement  with  each of its
directors and officers.


ITEM 7.  CONTRIBUTIONS AND PUBLIC RELATIONS

Part I   None
Part II  None


ITEM 8.  SERVICE, SALES AND CONSTRUCTION CONTRACTS

Part I.   (1)  Ameren Services/Ameren  Energy Resources Company  -  September 3,
          1999.  (See Appendix A)

Part II.  The System companies  had no contracts  to purchase  services or goods
          during 1998 from any affiliated  (other than a System company) or from
          a company,  in which any officer or director of the  receiving company
          is a partner or owns  5 percent  of more of any class of equity secur-
          ities, except as reported in Item 6.

Part III. The  System  company  does  not  employ  any  other  person  for  the
          performance  on a  continuing  basis  of  management,  supervisory  or
          financial advisory services.

                                      -20-

<PAGE>

ITEM 9.  WHOLESALE GENERATORS AND FOREIGN UTILITY COMPANIES

None.


ITEM 10.  FINANCIAL STATEMENTS AND EXHIBITS

FINANCIAL STATEMENTS

Filed confidentially as Appendix B on Form SE.

                                            NOTES TO FINANCIAL STATEMENTS

Ameren Corporation                          Reference is  made to "Notes to Con-
                                            solidated Financial Statements" con-
                                            tained on pages 28 through 42 in the
                                            Ameren 1999 Annual Report to  Share-
                                            holders, which information is incor-
                                            porated by reference.


Union Electric                              Reference is  made to "Notes to  Fi-
                                            nancial   Statements"   contained on
                                            pages  22  through  37  in the Union
                                            Electric 1999 Annual  Report,  which
                                            information   is   incorporated  by
                                            reference.


Central Illinois Public Service             Reference is  made  to "Notes to Fi-
                                            nancial   Statements"  contained  on
                                            pages 22  through 36 in the  Central
                                            Illinois Public  Service 1999 Annual
                                            Report, which  information is incor-
                                            porated by reference.


                                      -21-

<PAGE>


EXHIBITS

The following  exhibits are  incorporated by reference to the indicated SEC file
number, unless a single asterisk appears next to the exhibit reference. A single
asterisk indicates exhibits which are filed herewith.

EXHIBIT
NUMBER                     DESCRIPTION

A.   ANNUAL REPORTS FILED UNDER THE SECURITIES AND EXCHANGE ACT OF 1934

     A.1  1999  Annual  Report on Form 10-K for  Ameren  Corporation.  (File No.
          001-14756)

     A.2  1999 Annual Report on Form 10-K for Central  Illinois  Public  Service
          Company. (File No. 001-03672)

     A.3  1999 Annual Report on Form 10-K for Union Electric Company.  (File No.
          001-02967)

     A.4  2000 Proxy Statement of Ameren Corporation. (File No. 001-14756)

     A.5  2000 Proxy Statement of Central Illinois Public Service Company. (File
          No. 001-03672)

     A.6  2000 Proxy Statement of Union Electric Company. (File No. 001-02967)

*B.  CHARTERS, ARTICLES OF INCORPORATION,  TRUST AGREEMENTS,  BY-LAWS, AND OTHER
     FUNDAMENTAL DOCUMENTS OF ORGANIZATION

     B.1  Ameren Energy  Resources  Company  (Ameren  Intermediate  Holding Co.)
          (Filed herewith on Form SE)

C.   NONE DURING THE YEAR 1999.

*D.  AGREEMENT   ALLOCATING   CONSOLIDATED   INCOME  TAX   LIABILITY  BY  AMEREN
     CORPORATION AND SUBSIDIARIES (filed herewith on Form SE)

*F.  SCHEDULES SUPPORTING ITEMS OF THE REPORT

     F.1  The  opinion of the  independent  accountants  as to the  consolidated
          financial  statements  and the  footnotes are included in Exhibit A.1,
          which is incorporated by reference.

     F.2  Supporting  plant,   depreciation  and  reserve  schedules  for  Union
          Electric  Company  from  FERC  Form  No. 1 -  Annual  Report  of Major
          Electric  Utilities,  Licensees,  and Others, FERC Form No. 2 - Annual
          Report of Natural Gas  Companies,  and Form 21 ILCC - Annual Report of
          Electric Utilities Licensees and/or Natural Gas Utilities as follows:
          (filed herewith on Form SE)

          Summary of Utility Plant and Accumulated  Provisions for Depreciation,
          Amortization and Depletion (Electric & Gas)

          Nuclear Fuel Materials

          Electric Plant in Service

          Gas Plant in Service

          Electric Plant Held for Future Use

          Construction Work in Progress - Electric

                                      -22-

<PAGE>

          Construction Work in Progress - Gas

          Accumulated Provision for Depreciation of Electric Utility Plant

          Accumulated Provision for Depreciation of Gas Utility Plant

          Gas Stored

          Non-utility Property

          Accumulated Provision for Depreciation and Amortization of Non-utility
          Property

          Depreciation and Amortization of Electric Plant

          Depreciation, Depletion and Amortization of Gas Plant

     F.3  Supporting  plant,  depreciation  and  reserve  schedules  for Central
          Illinois  Public Service  Company from FERC Form No. 1 - Annual Report
          of Major Electric Utilities,  Licensees, and Others and Form 21 ILCC -
          Annual  Report of  Electric  Utilities  Licensees  and/or  Natural Gas
          Utilities as follows: (filed herewith on Form SE)

          Summary of Utility Plant and Accumulated  Provisions for Depreciation,
          Amortization and Depletion (Electric & Gas)

          Electric Plant in Service

          Gas Plant in Service

          Manufactured Gas Production Plant - Supplemental Schedule

          Electric Plant Held for Future Use

          Gas Plant Held for Future Use

          Construction Work in Progress - Electric

          Construction Work in Progress - Gas

          Accumulated Provision for Depreciation of Electric Utility Plant

          Accumulated Provision for Depreciation of Gas Utility Plant

          Gas Stored

          Non-utility Property

          Accumulated Provision for Depreciation and Amortization of Non-utility
          Property

          Depreciation and Amortization of Electric Plant

          Depreciation, Depletion and Amortization of Gas Plant

*G.  FINANCIAL DATA SCHEDULES (filed herewith in Form SE)

     G.1  Financial Data Schedule of Ameren Corporation Consolidated

     G.2  Financial Data Schedule of Ameren Corporation

                                      -23-

<PAGE>

     G.3  Financial Data Schedule of Union Electric Company

     G.4  Financial Data Schedule of Central Illinois Public Service Company

     G.5  Financial Data Schedule of Ameren Services

     G.6  Financial Data Schedule of Electric Energy Inc

     G.7  Financial Data Schedule of Ameren Energy

     G.8  Financial Data Schedule of CIPSCO Investment Company

     G.9  Financial Data Schedule of Ameren Development Company

     G.10 Financial Data Schedule of Ameren Energy Resources






                                    SIGNATURE


Ameren  Corporation,  a registered holding company,  has duly caused this annual
report for the year ended  December  31,  1998 to be signed on its behalf by the
undersigned  thereunto  duly  authorized,  pursuant to the  requirements  of the
Public Utility Holding Company Act of 1935.



                                        AMEREN CORPORATION


                                        By:   /S/ Warner L. baxter
                                            -------------------------
                                                Warner L. Baxter
                                            Vice President and Controller

April 28, 2000



                                      -24-


<PAGE>

                                    APPENDIX

                                      -25-


<PAGE>

                                                                      Appendix A

                           GENERAL SERVICES AGREEMENT

                                     Between

                             AMEREN SERVICES COMPANY

                                       and

                         AMEREN ENERGY RESOURCES COMPANY

     THIS AGREEMENT,  made and entered into this Third day of September 1999, by
and  between  the  following  Parties:   AMEREN  SERVICES  COMPANY  (hereinafter
sometimes referred to as "Service Company"), a Missouri corporation;  and Ameren
Energy  Resources  Company   (hereinafter   sometimes  referred  to  as  "Client
Company"); WITNESSETH:

     WHEREAS,  Client Company, and its other subsidiaries,  desire to enter into
this agreement  providing for the  performance by Service Company for the Client
Company of certain services more particularly set forth herein; and

     WHEREAS,  Service Company is organized,  staffed and equipped and has filed
with the  Securities  and  Exchange  Commission  ("the SEC") to be a  subsidiary
service company under Section 13 of the Public Utilities  Holding Company Act of
1935 (the  "Act") to render to Ameren  Corporation,  and other  subsidiaries  of
Ameren Corporation, certain services as herein provided; and

     WHEREAS, to maximize efficiency, and to achieve merger related savings, the
Client Company desires to avail itself of the advisory, professional,  technical
and other services of persons employed or to be retained by Service Company, and
to compensate Service Company appropriately for such services,


<PAGE>

     NOW,  THEREFORE,  in  consideration  of the  premises  and  of  the  mutual
agreements herein, the parties hereto agree as follows:

Section 1. Agreement to Furnish Services
- ----------------------------------------

     Service  Company agrees to furnish to Client Company and its  subsidiaries,
if any, upon the terms and conditions herein provided,  the services hereinafter
referred to and  described  in Section 2, at such times,  for such period and in
such manner as Client  Company may from time to time  request.  Service  Company
will keep itself and its  personnel  available and competent to render to Client
Company such services so long as it is  authorized  so to do by the  appropriate
federal and state regulatory agencies.

Section 2.  Services to be Performed
- ------------------------------------

     The services to be provided by Service Company hereunder may, upon request,
include the services as set out in Schedule 1,  attached  hereto and made a part
hereof. A revised Schedule 1 will be provided on an annual basis.

     In addition to the Services set out in Schedule 1,  Service  Company  shall
render advice and  assistance  in  connection  with such other matters as Client
Company may request and Service  Company  determines  it is able to perform with
respect to Client Company's business and operations.

Section 3.  Compensation of Service Company
- -------------------------------------------

     As compensation for such services rendered to it by Service Company, Client
Company  hereby  agrees to pay to  Service  Company  the cost of such  services,
computed in accordance with applicable


<PAGE>

rules and regulations (including, but not limited to, Rules 90 and 91) under the
Act and appropriate accounting standards.

     Compensation  to be paid by Client Company shall include direct charges and
Client Company's fairly allocated pro rata share of certain of Service Company's
costs,  determined  as set out on  Schedule 2,  attached  hereto and made a part
hereof.

Section 4.  Securities and Exchange Commission Rules
- ----------------------------------------------------

     It is the intent of the Parties that the determination of the costs as used
in this Agreement shall be consistent with, and in compliance with the rules and
regulations  of the SEC,  as they now read or  hereafter  may be modified by the
Commission.

Section 5.  Service Requests
- ----------------------------

     Services will be performed in  accordance  with a Service  Request  system,
consisting  of work orders  established  to capture  the various  types of costs
incurred by Service  Company.  Costs will be charged to the appropriate  service
requests,  which  will  then be the  basis  for the  billing  of costs to Client
Company.

Section 6.  Payment
- -------------------

     Payment  shall be by making  remittance  of the amount  billed or by making
appropriate accounting entries on the books of the companies.

     Payment  shall be  accomplished  on a  monthly  basis,  and  remittance  or
accounting entries shall be completed within 60 days of billing.


<PAGE>

Section 7.  Ameren Corporation
- ------------------------------

     Except as authorized by rule,  regulation,  or order of the  Securities and
Exchange  Commission,  nothing in this Agreement  shall be read to permit Ameren
Corporation,  or any person  employed  by or acting for Ameren  Corporation,  to
provide  services  for other  Parties,  or any  companies  associated  with said
Parties.

Section 8.  Client Company
- --------------------------

     Except as limited by Section 7, nothing in this Agreement  shall be read to
prohibit  Client  Company or its  subsidiaries  from  furnishing to other Ameren
companies  or their  subsidiaries  services  herein  referred to, under the same
conditions and terms as set out for Service Company.

Section 9.  Effective Date and Termination
- ------------------------------------------

     This  Agreement  is executed  subject to the  consent  and  approval of all
applicable regulatory agencies, and if so approved in its entirety, shall become
effective as of the date stated below, and shall remain in effect from said date
unless  terminated  by mutual  agreement  or by any Party  giving at least sixty
days' written notice to the other Parties prior to the beginning of any calendar
year, each Party fully reserving the right to so terminate the Agreement.

     This  Agreement may also be terminated to the extent that  performance  may
conflict  with any rule,  regulation  or order of the  Securities  and  Exchange
Commission adopted before or after the making of this Agreement.


<PAGE>

Section 10.  Assignment
- -----------------------

     This  Agreement and the rights  hereunder  may not be assigned  without the
mutual written consent of all Parties hereto.

     IN WITNESS  WHEREOF,  the Parties  hereto have caused this  Agreement to be
executed and attested by their authorized  officers as of the day and year first
above written.

                                            AMEREN SERVICES COMPANY

                                            By
                                                -----------------------------

                                            Title  Treasurer
                                                -----------------------------
ATTEST:

By
   ----------------------

Title Assistant Secretary
      --------------------
                                            AMEREN ENERGY RESOURCES COMPANY

                                            By
                                               ------------------------------

                                            Title President
                                                  ---------------------------
ATTEST:

By
   ----------------------
Title Assistant Secretary


<PAGE>


                                                                  Schedule 1
                                                                  Page 1 of 10

                        DESCRIPTION OF EXPECTED SERVICES
                      TO BE PROVIDED BY AMEREN SERVICES AND
                     EXPECTED DIRECT COST ALLOCATION FACTORS

Description of Expected Services to be Provided

A  description  of the  expected  services to be provided by Ameren  Services is
detailed  below.  Identifiable  costs  for all of the  functional  organizations
listed  below  will  be  directly   charged  to  Ameren   Corporation   and  its
subsidiaries, whenever possible.

For costs that cannot be directly  assigned or distributed,  the expected direct
cost allocation factors are reflected below for each Ameren Services department.

     a)   Building Service

     Description  - Provide  facility  management  services for owned and leased
     facilities, excluding power plants. To the extent that leasing arrangements
     are established  between Ameren Services and/or Ameren  Corporation and its
     subsidiaries,  lease  costs  will  include  rent  for  space  occupied  and
     applicable  services,  such as operation  and  maintenance  of  structures,
     capital improvements,  interior space planning, security and janitorial. As
     appropriate,  lease costs will be allocated  based on square feet  occupied
     and the allocation factors listed below.

     Expected  Allocation  Factors - 1) number of employees;  2) operations  and
     maintenance labor; 3) total capitalization; and 4) total assets

     b)   Controller's

     Description  -  Perform  all  accounting  services  necessary  to  properly
     maintain   and  report  on  the  books  and   records  of  Ameren  and  its
     subsidiaries. Provide investor relations services.

     Expected Allocation Factors - 1) composite*;  2) total capitalization;  and
     3) total assets

     c)   Corporate Communications

     Description - Develop  strategies for  advertising  and marketing  efforts,
     develop employee communication programs,


<PAGE>

                                                                  Schedule 1
                                                                  Page 2 of 10


     coordinate  community relations efforts and develop policies and procedures
     for media relations.

     Expected Allocation Factors - 1) composite*;  2) total capitalization;  and
     3) total assets

     d)   Corporate Planning

     Description - Provide rate  engineering,  interchange  marketing,  resource
     planning and business analysis services.

     Expected  Allocation  Factors - 1) composite*;  2) kwh sales;  3) peak load
     [electric]; 4) total capitalization; and 5) total assets

     e)   Customer Services/Division Support

     Description - Answer customer inquiries  pertaining to electric/gas service
     usage and perform credit activities.  Provide technical support relating to
     planning,  engineering,  constructing  and operating the  distribution  and
     transmission   systems.   Provide  technical  support  and  maintenance  of
     protective  relay  schemes,  station  meter work,  system  testing and data
     acquisition systems.

     Expected  Allocation  Factors  - 1)  number  of  customers;  2)  number  of
     employees; and 3) operations and maintenance labor

     f)   Economic Development

     Description - Provide community and business development  services, as well
     as  natural  gas  development  services.  Analyze  community  and  business
     development opportunities.

     Expected  Allocation  Factors - 1) number of  customers;  2) sales [kwh and
     dekatherm]; 3) total capitalization; and 4) total assets

     g)   Energy Supply

     Coordinate  the use of the  generating,  transmission  and  interconnection
     facilities to provide economical and reliable energy.

     Expected Allocation Factors - 1) kwh sales


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                                                                  Schedule 1
                                                                  Page 3 of 10


     h)   Engineering and Construction

     Description - Provide professional services related to engineering studies,
     design,  procurement,  planning, building and management of projects. Study
     technology  that  may  reduce  costs of  producing,  delivering  and  using
     electricity.

     Expected  Allocation  Factors  - 1) peak  load  [electric];  2)  generating
     capacity; and 3) construction expenditures

     i)   Environmental Services & Safety

     Description - Perform  analysis and advocacy of regulatory and  legislative
     issues in the areas of environment,  health and safety.  Communicate  final
     regulatory requirements to operating groups. Provide assistance and support
     and  compliance  review in meeting those  requirements.  Oversee  hazardous
     substance site investigation and remediation activities.

     Expected  Allocation  Factors  - 1)  number  of  employees;  2)  generating
     capacity;   3)  operations  and  maintenance  labor;  and  4)  construction
     expenditures

     j)   Executive

         Description - Provide  executive  management  duties for all applicable
         activities at the department, function and officer levels.

     Expected Allocation Factors - 1) total capitalization; 2) total assets; and
     3) sales [kwh and dekatherm]

     k)   Fossil Fuel Procurement

     Description  - Provide  resources  necessary to procure fuel for the fossil
     power plants and minimize production costs.

     Expected Allocation Factors - 1) kwh sales

     l)   Gas Supply

     Description  - Provide gas supply and  pipeline  capacity  procurement  and
     management  services.  Develop  policies,  procedures  and standards  which
     govern the design, construction and operation of the gas systems.


<PAGE>

                                                                  Schedule 1
                                                                  Page 4 of 10


     Expected  Allocation  Factors  - 1)  dekatherm  sales;  2)  gas  throughput
     [includes transportation]; and 3) peak load [gas]

     m)   General Counsel

     Description  - Provide  general  legal  advice  related  to all  applicable
     activities  and  legal  services  in  regards  to  legislative  activities,
     regulatory agencies and security matters. Make regulatory filings, maintain
     minutes of the board of directors, conduct stockholder meetings and procure
     property and casualty insurance bonds.

     Expected Allocation Factors - 1) composite*;  2) total capitalization;  and
     3) total assets

     n)   Human Resources

     Description  -  Administer  and  negotiate   employee  benefits   including
     pensions,  major medical,  long-term  disability,  life insurance,  defined
     contribution plans,  executive benefit and flexible spending plans. Provide
     employment   services,   including   required   regulatory   reporting  and
     maintenance   of  personnel   records.   Provide   employee   training  and
     communications services.

     Expected   Allocation   Factors  -  1)  number  of   employees;   2)  total
     capitalization; 3) total assets; and 4) operation and maintenance labor

     o)   Industrial Relations

     Description  - Negotiate,  represent  and  administer  provisions  of labor
     agreements applicable to unions representing union employees.

     Expected Allocation Factors - 1) number of employees;  and 2) operation and
     maintenance labor

     p)   Information Services

     Description  -  Provide  for the  development  and  operation  of  computer
     software,  telecommunications  and other equipment used to conduct business
     and  engineering  activities.  Maintain  all  billing  records  and process
     customer meter readings.

     Expected  Allocation  Factors - 1) composite*;  2) number of customers;  3)
     number of employees; 4)CPU cycles; and 5) operation and maintenance labor


<PAGE>

                                                                  Schedule 1
                                                                  Page 5 of 10


     q)   Internal Audit

     Description   -  Audit  company   operations,   perform   operational   and
     productivity  reviews,  review  justifications  for  capital  projects  and
     perform quality assurance reviews.

     Expected  Allocation  Factors - 1) composite*;  2) number of customers;  3)
     number of employees; and 4) operation and maintenance labor

     r)   Marketing

     Description - Provide  marketing  services  including  account  management,
     program development, market research and customer energy services.

     Expected  Allocation  Factors - 1) sales [kwh and dekatherm];  and 2) total
     assets

     s)   Merger Coordination

     Description  -  Monitor  programs  to  achieve  savings,  merger  costs and
     position reductions as they relate to the implementation plans.

     Expected Allocation Factors - 1) composite*;  2) total capitalization;  and
     3) total assets

     t)   Motor Transportation

     Description - Provide  engineering,  support,  and mechanical  servicing of
     vehicles, procurement of vehicles and safety and training programs.

     Expected Allocation Factors - 1) number of vehicles

     u)   Purchasing

     Description - Provide  procurement  of goods and services  other than fuel.
     Provide materials inventory management services.

     Expected  Allocation  Factors  - 1)  composite*;  2) total  assets;  and 3)
     construction expenditures

     v)   Real Estate

     Description  -  Acquire   necessary  land  rights  and  permits   including
     coordination  of  site  selection.  Maintain  existing  land  rights  while
     permitting  licenses and leases to minimize  investment or costs of holding
     property.

<PAGE>

                                                                  Schedule 1
                                                                  Page 6 of 10


     Expected Allocation Factors - 1) composite*; 2) number of customers; and 3)
     total assets

     w)   Stores

     Description - Provide clerical, stenographic, administrative and Electronic
     Data systems  support.  Provide  engineering  support and manage and direct
     stores operations.

     Expected Allocation Factors - 1) composite*

     x)   Tax

     Description  -  Research  and  consult  on tax  issues in  connection  with
     federal, state and local tax compliance and planning matters, including the
     preparation and filing of returns.

     Expected  Allocation  Factors - 1) composite*;  2) current tax expense;  3)
     total capitalization; and 4) total assets

     y)   Treasurer's

     Description - Provide  treasury  operation,  mailing,  financial  planning,
     investments, and executive payroll and pension disbursement services.

     Expected  Allocation  Factors - 1) composite*;  2) number of customers;  3)
     number of employees; 4) total capitalization; and 5) total assets



*Composite  consists  of the  following  three  factors  (equal  weight  to each
factor):
      Sales (kwh and dekatherm)
      Number of customers
      Number of employees


<PAGE>

                                                                  Schedule 1
                                                                  Page 7 of 10


Allocation Factors

The following allocation factors will be utilized as outlined above.

Number of Customers - Based on the number of customers  (electric and/or gas) at
the end of the most  recent  calendar  year.  The  numerator  of which is for an
Operating  Company and the denominator of which is for all Operating  Companies.
This ratio will be determined  annually,  and/or at such time as may be required
due to a significant change in circumstances.

Sales - Based on the sales  volume (kwh and/or  dekatherms)  for the most recent
calendar  year.  The  numerator  of which is for an  Operating  Company  and the
denominator  of  which  is for  all  Operating  Companies.  This  ratio  will be
determined annually, and/or at such time as may be required due to a significant
change in circumstances.

Number  of  Employees  - Based  on the  number  of  employees  (contract  and/or
non-contract, or electric operating and/or gas operating) at the end of the most
recent  calendar year. The numerator of which is for an Operating  Company or an
affected  affiliate  company.  The  denominator  of which  is for all  Operating
Companies  and  affected  affiliate  companies.  This ratio  will be  determined
annually,  and/or at such time as may be required due to a significant change in
circumstances.

Composite  - Based on an equal  weighting  Sales  (kwh &  dekatherm),  Number of
Customers  (total),  and Number of Employees  (total)  allocation  factors.  The
numerator  of which is the simple  average  of the above  three  factors  for an
Operating  Company and the denominator of which is for all Operating  Companies.
This ratio will be  determined  annually  and/or at such time as may be required
due to a significant change in circumstances.

Operations & Maintenance  Labor - Based on the  Operations &  Maintenance  Labor
(electric  and/or gas) for the most recent calendar year. The numerator of which
is for an Operating  Company or an affected  affiliate  and the  denominator  of
which is for all Operating  Companies  and affected  affiliate  companies.  This
ratio will be determined annually, and/or at such time as may be required due to
a significant change in circumstances.

Revenues - Based on revenues  (electric and/or gas) for the most recent calendar
year.  The  numerator  of  which  is for an  Operating  Company  or an  affected
affiliate  company.  The  denominator  of which is for all  Operating  Companies
and/or affected affiliate companies.  This ratio will be determined annually, or
at such time as may be required due to a significant change in circumstances.


<PAGE>

                                                                  Schedule 1
                                                                  Page 8 of 10


Total Capitalization - Based on total capitalization (total common stockholder's
equity,  preferred  stock,  and long  term  debt) at the end of the most  recent
calendar year. The numerator of which is for an Operating Company or an affected
affiliate company.  The denominator of which is for all Operating  Companies and
affected affiliate companies.  This ratio will be determined annually, and/or at
such time as may be required due to a significant change in circumstances.

Total  Assets - Based on total  assets  at the end of the most  recent  calendar
year.  The  numerator  of  which  is for an  Operating  Company  or an  affected
affiliate company.  The denominator of which is for all Operating  Companies and
affected affiliate companies.  This ratio will be determined annually, and/or at
such time as may be required due to a significant change in circumstances.

Construction  Expenditures  - Based on  construction  expenditures  for the most
recent  calendar year. The numerator of which is for an Operating  Company or an
affected  affiliate  company.  The  denominator  of which  is for all  Operating
Companies  and  affected  affiliate  companies.  This ratio  will be  determined
annually,  and/or at such time as may be required due to a significant change in
circumstances.

Peak Load  (electric)  - Based on the  highest  monthly  maximum  megawatt  load
(60-minute  integration)  for the most recent  calendar  year.  The numerator of
which  is for an  Operating  Company  and the  denominator  of  which is for all
Operating Companies. This ratio will be determined annually, and/or at such time
as may be required due to a significant change in circumstances.

Peak Load  (gas) - Based on the  highest  daily  send out in  therms  (excluding
transportation) for the most recent calendar year. The numerator of which is for
an  Operating  Company  and  the  denominator  of  which  is for  all  Operating
Companies. This ratio will be determined annually, and/or at such time as may be
required due to a significant change in circumstances.

Generating Capacity  (nameplate) - Based on installed capacity nameplate ratings
at the end of the most recent  calendar  year.  The numerator of which is for an
Operating  Company and the denominator of which is for all Operating  Companies.
This ratio will be determined  annually,  and/or at such time as may be required
due to a significant change in circumstances.

Gas   Throughput  -  Based  on  gas   throughput   in   dekatherms   (sales  and
transportation) for the most recent calendar year. The numerator of which is for
an Operating Company.  The denominator of which is for all Operating  Companies.
This ratio will be determined

<PAGE>

                                                                  Schedule 1
                                                                  Page 9 of 10


annually,  and/or at such time as may be required due to a significant change in
circumstances.

CPU Cycles - Based on cpu cycles (by  application)  for the most recent calendar
year.  The  numerator  of  which  is for an  Operating  Company  or an  affected
affiliate company.  The denominator of which is for all Operating  Companies and
affected affiliate companies.  This ratio will be determined annually, and/or at
such time as may be required due to a significant change in circumstances.

Current  Tax  Expense - Based on taxes  charged  (income and other) for the most
recent  calendar year. The numerator of which is for an Operating  Company or an
affected  affiliate  company.  The  denominator  of which  is for all  Operating
Companies  and  affected  affiliate  companies.  This ratio  will be  determined
annually,  and/or at such time as may be required due to a significant change in
circumstances.

Number of  Vehicles - Based on number of  vehicles at the end of the most recent
calendar  year.  The  numerator  of which is for an  Operating  Company  and the
denominator  of  which  is for  all  Operating  Companies.  This  ratio  will be
determined annually, and/or at such time as may be required due to a significant
change in circumstances.

In  addition  to  the  allocation  factors  listed  above,   appropriate  direct
allocations  will be made for  costs  benefiting  a single  affiliate.  Indirect
allocations  will  also  be  made  to all  affiliates,  including  non-regulated
companies and Ameren Corporation.

It may be  necessary  to  allocate a  percentage  of total  costs  allocated  to
non-regulated  companies or Ameren Corporation (see below). This will be done as
a  sub-factor  of  existing  allocation  factors.  For  example,   allocating  a
percentage of customer service costs to  non-regulated  companies and allocating
remaining costs based on number of customers.  Also,  allocating a percentage of
video presentation  costs to Ameren  Corporation and allocating  remaining costs
based on capitalization.

Non-Regulated - Based on a percentage of total costs allocated to  non-regulated
companies when existing  allocation  methods do not adequately reflect the level
of services or benefits  received.  After  allocating  this  percentage of total
costs to non-regulatory company, the remaining costs will be allocated to Ameren
Corporation  and/or  its  subsidiaries,  as  appropriate,  based upon one of the
factors above.

Corporate - Based on a percentage of total costs allocated to Ameren Corporation
(AMC) when existing  allocation  methods do not


<PAGE>

                                                                  Schedule 1
                                                                  Page 10 of 10


adequately reflect the level of services or benefits received.  After allocating
this  percentage  of total costs to AMC, the  remaining  costs will be allocated
based upon one of the factors above.


<PAGE>


                                                                  Schedule 2
                                                                  Page 1 of 1


                                 AMEREN SERVICES
                     EXPECTED ALLOCATED DIRECT COST FACTORS


 LLOCATION NUMBER               DESCRIPTION

    001A                Composite*
    002A                Number of customers
    002B                Number of gas transportation customers
    002C                Number of electric customers
    002D                Number of gas customers
    002E                % to unregulated company/number of customers
    002F                Number of Customers (Illinois Non-Residential Electric)
    002G                Number of Customers (Illinois Non-residential Gas)
    002H                Number of Customers (Illinois Non-residential)
    003A                Sales (kwh and dekatherm)
    003B                Kwh sales
    003C                Dekatherm sales
    004A                Number of employees
    004B                Number of contract employees
    004C                Number of non-contract employees
    004D                Number of AMS & UEC employees
    005A                O&M labor
    006A                Total revenues
    006B                Electric revenues
    006C                Gas revenues
    007A                Total capitalization
    007B                % to Ameren Corporation/total capitalization
    008A                Total assets
    009A                Construction expenditures
    010A                Peak load (electric)
    010B                Peak load (gas)
    011A                Generating capacity
    012A                Gas throughput (includes transportation)
    013A                CPU cycles - mainframe
    013B                CPU cycles - UNIX
    015A                Current tax expense
    016A                Number of vehicles


*Composite  consists  of the  following  three  factors  (equal  weight  to each
factor):
       Sales (kwh and dekatherm)
       Number of customers
       Number of employees



                                                                       Exhibit D

                               AMEREN CORPORATION
                         AND ITS AFFILIATED CORPORATIONS

                            TAX ALLOCATION AGREEMENT

     This  agreement  is made as of  ______________,  20__ by and  among  Ameren
Corporation,  a registered  public utility holding  company,  and its affiliated
corporations,  as  identified  in Exhibit A hereto  (collectively,  the "Group";
individually, "member of the Group").

     WHEREAS,  the members of the Group are affiliated  corporations  within the
meaning of section 1504 of the Internal  Revenue Code of 1986,  as amended,  and
will join in the annual filing of a consolidated federal income tax return;

     WHEREAS,  the  members of the Group  intend to  allocate  the  consolidated
income tax  liabilities  and  benefits to each member of the Group in a fair and
equitable manner; and

     WHEREAS,  the members of the Group intend to allocate the  liabilities  and
benefits  arising  from the Group's  annual  consolidated  income tax returns in
compliance with Title 17, section 250.45(c) of the Code of Federal  Regulations,
section   1552(a)(1)  of  the  Internal  Revenue  Code  and  Title  26,  section
1.1502-33(d)(2) of the Code of Federal Regulations;

     IT IS THEREFORE AGREED, as follows:

     Section 1. Definitions

     For purposes of this agreement, the following definitions shall apply:

     (a)  "Consolidated  tax" shall mean the Group's aggregate tax liability for
          a taxable year as shown on the consolidated federal income tax return.

     (b)  "Consolidated refund" shall mean the Group's refund for a taxable year
          as shown on the consolidated federal income tax return.

     (c)  "Corporate  taxable income" or "corporate taxable loss" shall mean the
          income or loss of a member of the Group for a taxable  year,  computed
          as though the member had filed a separate federal income tax return on
          the same basis as used in the consolidated return, except that:

          (1)  Dividend  income  from  other  members  of  the  Group  shall  be
               disregarded, and

          (2)  Intercompany transactions that are eliminated in the consolidated
               return shall be given appropriate treatment.

<PAGE>

                                      -2-

     (d)  "Separate  return tax" shall mean the federal  income tax liability or
          federal  income tax refund,  computed  with  respect to the  corporate
          taxable  income or loss of a member of the Group as though  the member
          were  not a member  of the  Group.  If the  separate  return  tax is a
          liability,  it shall be  referred to as a  "positive  separate  return
          tax." If the separate return tax is a refund,  it shall be referred to
          as a "negative separate return tax."

     (e)  A "positive"  allocation  shall be the obligation to make a payment to
          the Group.  A  "negative"  allocation  shall be the right to receive a
          payment from the Group.

     Section 2. General Allocation Method

     Each taxable year, the members of the Group shall allocate the consolidated
tax or consolidated refund in accordance with the following procedures:

     (a)  A member,  to include Ameren  Corporation,  that would have a positive
          separate  return tax shall receive a positive  allocation in an amount
          equal to such positive separate return tax.

     (b)  A member,  other than Ameren  Corporation,  that would have a negative
          separate  return tax shall receive a negative  allocation in an amount
          equal to such negative separate return tax.

     (c)  If Ameren  Corporation would have a negative separate return tax, then
          each  member  having  positive  separate  return  tax shall  receive a
          negative  allocation  in an  amount  equal to such  negative  separate
          return tax multiplied by the member's share of the sum of the positive
          separate return tax.

     Section 3. Special Allocation Rules

     (a)  Alternative  Minimum Tax. In any year in which alternative minimum tax
          (AMT) is payable by the Group, the consolidated tax shall be separated
          into two parts: regular tax and AMT.

          (1)  Regular tax shall be  allocated  in  accordance  with the general
               allocation method set forth in section 2, above.

          (2)  AMT will be  allocated  to each  member of the Group based on the
               proportion of:

               (A) the excess of its separate company tentative minimum tax over
               its separate company regular tax liability, to

<PAGE>

                                      -3-

               (B) the  aggregate of the excesses of such  companies'  tentative
               minimum tax amounts over their regular tax liability amounts.

          (3)  Each member whose  regular tax  liability  exceeds its  tentative
               minimum tax on a separate  company  basis shall be excluded  from
               this  calculation  and shall not be  impacted  by the Group's AMT
               liability.

          (4)  The minimum tax credit  shall be  allocated to the members of the
               Group to which the associated AMT was allocated, in proportion to
               the associated AMT allocated to such members.

     (b)  Investment Tax Credits; Other Tax Benefits and Material Items Taxed at
          Different  Rates.  Any investment tax credits,  other tax benefits and
          material  items  taxed at rates  other  than  the rate  applicable  to
          corporate taxable income shall be allocated directly to the members of
          the Group giving rise to them.

          Section 4. Maximum Allocation

          The tax  allocated to any member shall not exceed the separate  return
     tax of such member.

          Section 5. Payments

          Each  member of the Group is  responsible  for its own tax  liability.
     Payment of such  liability  shall be made in accordance  with the following
     procedure:

          (a)  A member of the Group with a net  positive  allocation  shall pay
               Ameren Corporation the net amount allocated.

          (b)  A  member  of the  Group  with a net  negative  allocation  shall
               receive payment from Ameren  Corporation in the amount of the net
               negative allocation.

          (c)  Ameren  Corporation shall pay to the Internal Revenue Service the
               Group's net current  federal income tax liability from the net of
               the receipts and payments to and from members of the Group.

          (d)  Ameren  Corporation  shall make any calculations on behalf of the
               members of the Group  necessary to comply with the  estimated tax
               provisions  of IRC  section  6655.  Based  on such  calculations,
               Ameren Corporation shall charge the members  appropriate  amounts
               at intervals consistent with the dates in that section.

          (e)  If the Group has a consolidated  net operating loss ("NOL") for a
               taxable year (the "loss year") and the NOL cannot be used in full
               by being carried back to a prior taxable year, the unused portion
               of the NOL shall be allocated  (as negative  allocations)  to the
               members of the Group  having  negative  allocations  for the loss
               year in  proportion  to the relative  magnitude of such  negative
               allocations  for the

<PAGE>

                                      -4-

               loss year. Each such member shall carry negative  allocation from
               the loss year forward to the  following  taxable year and combine
               it with its allocation for such following taxable year.

          (f)  A member shall make any payment  required by this section  within
               60 days  after  receiving  notice  of such  payment  from  Ameren
               Corporation.  Alternatively,  in  the  case  of any  second  tier
               subsidiary  (any company that is  wholly-owned  by Union Electric
               Company,  Central  Illinois  Public  Service  Company,  or CIPSCO
               Investment  Company),  the parent of such second-tier  subsidiary
               may make the  payment  required  by the  preceding  sentence  for
               itself and all of its second-tier  subsidiaries within the 60-day
               period,  with the  second-tier  subsidiaries  to compensate  such
               parent within a reasonable time thereafter.

          Section 6. Adjustments to Tax Liability Shown on Returns

               (a) In the event that the consolidated tax or consolidated refund
          is subsequently adjusted by the Internal Revenue Service or by a court
          decision,  the  consolidated  tax,  consolidated  refund and  separate
          return  tax  shall  be  adjusted   accordingly   consistent  with  the
          methodology set forth previously in this agreement. Any prior payments
          among the  members of the Group  shall be  adjusted  to conform to the
          change.

               (b) If any  interest  is  paid  or  received  as a  result  of an
          adjustment to  consolidated  tax or  consolidated  refund,  it will be
          allocated to the parties in the proportion  that each member's  change
          in  separate  tax  in  each  affected  year  bears  to the  change  in
          consolidated tax or consolidated refund.

               (c) Any penalty  shall be paid by the member of the Group that is
          responsible  for  the  penalty.  If  the  party  at  fault  cannot  be
          determined, the penalty shall be allocated in the same manner as if it
          were additional tax.

          Section 7. State Income Taxes

               (a) Any state  income  tax  liability  (including  liability  for
          interest or penalties)  associated with the filing of a separate state
          income tax return by a member of the Group shall be  allocated  to and
          paid directly by such member.

               (b) Any state  income  tax  liability  (including  liability  for
          interest  or  penalties)  associated  with the  filing of a unitary or
          combined  state  return shall be allocated to the members of the Group
          participating in the returns  following the procedures set forth above
          for federal income tax liabilities.

               (c) Because certain states utilize a unitary method,  the Group's
          aggregate  income tax  liability  to a state may exceed the sum of the
          members'  separate return income tax liabilities to the state. If this
          occurs,  the excess of the Group's  aggregate  liability to such state
          over the sum of the  members'  separate  return  liabilities  for such
          state shall be  allocated  to the member or

<PAGE>

                                      -5-

          members  whose  operations  caused the Group to be taxed by the state,
          following  the  procedures  set forth  above for  federal  income  tax
          liabilities.  Conversely,  the  sum of the  members'  separate  return
          liabilities  may exceed the Group's  aggregate  liability  to a state.
          Notwithstanding  section  4 of this  agreement,  if this  occurs,  the
          excess of the sum of the members' separate return liabilities for such
          state over the  Group's  aggregate  liability  to such state  shall be
          allocated to the member or members whose operations caused the excess,
          following  the  procedures  set forth  above for  federal  income  tax
          liabilities.

          Section 8. New Affiliates

          The members of the Group will cause any  corporation  which becomes an
     affiliated  corporation  within the meaning of IRC section  1504 to join in
     this agreement.

          Section 9. Amendment

          This  agreement  may be  amended  from  time to time as the  result of
     changes in federal or state law or relevant facts and circumstances.

         Section 10.       Cooperation of Members

          Each member shall execute and file such  consent,  elections and other
     documents  that may be required  or  appropriate  for the proper  filing of
     consolidated  income tax returns and for the  allocations  provided by this
     agreement.

         *        *        *        *       *        *        *        *

          The above  procedures  for  allocating  the  consolidated  income  tax
     liability  of the  Group  have been  agreed to by each of the below  listed
     members of the Group,  as evidenced by the  signature of an officer of each
     member.



     Ameren Corporation                 by:      ________________________


     Ameren Services Company            by:     _________________________


     Union Electric Company             by:     _________________________

     Union Electric Development
       Corporation                      by:      ________________________

     Central Illinois Public Service
       Company                          by:      ________________________

<PAGE>

                                      -6-

     CIPSCO Investment Company          by:      ________________________


     Ameren Energy, Inc.                by:      ________________________


     CIPS Energy Inc.                   by:     _________________________


     Illinois Steam, Inc.               by:      ________________________


     Ameren Development Company         by:      ________________________


     Ameren ERC, Inc.                   by:     _________________________


     Ameren Energy Communications,
       Inc.                             by:      ________________________

     Ameren Intermediate Holding        by:     _________________________
       Company

     Missouri Central Railroad          by:     _________________________
       Company

<PAGE>

                                      -7-

                                                               EXHIBIT A

Ameren Corporation
Ameren Services Company
Union Electric Company
Union Electric Development Corporation
Central Illinois Public Service Company
CIPSCO Investment Company
Ameren Energy, Inc.
CIPS Energy Inc.
Illinois Steam, Inc.
Ameren Development Company
Ameren ERC, Inc.
Ameren Energy Communications, Inc.
Ameren Intermediate Holding Company
Missouri Central Railroad Company


<TABLE> <S> <C>


<ARTICLE>                                                         OPUR1
<LEGEND>

                              AMEREN CORPORATION CONSOLIDATED
                              PUBLIC UTILITY HOLDING COMPANIES
                                          FORM U5S
                                       ARTICLE OPUR1
                                   (Thousands of Dollars)

</LEGEND>


<CIK>                                                        0001002910
<NAME>                                               AMEREN CORPORATION
<MULTIPLIER>                                                      1,000
<CURRENCY>                                                          USD



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





</TABLE>


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