TRIGEN ENERGY CORP
SC 13D/A, 1998-04-07
STEAM & AIR-CONDITIONING SUPPLY
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                               Amendment No. 2 to

                                  SCHEDULE 13D

                   Under the Securities Exchange Act of 1934*

                            Trigen Energy Corporation
  ---------------------------------------------------------------------------
                                (Name of Issuer)

                     Common Stock, $.01 par value per share
  ---------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    895930105
                       -----------------------------------
                                 (CUSIP Number)

                                Ray A. Mantle, Esq.
                               Piper & Marbury L.L.P.
                            1251 Avenue of the Americas
                           New York, New York 10020-1104
                                   (212) 835-6180
- - ---------------------------------------------------------------------------
 (Name, Address and Telephone Number of Person Authorized to Receive Notices
                               and Communications)

                                 August 10, 1997
                  --------------------------------------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to
report the acquisition which is the subject of this Schedule 13D, and is
filing this schedule because of Rule 13d-1(b)(3) or (4), check the
following box  |_|.

Check the following box if a fee is being paid with the statement  |_|. 
(A fee is not required only if the reporting person: (1) has a previous
statement on file reporting beneficial ownership of more than five percent
of the class of securities described in Item 1; and (2) has filed no
amendment subsequent thereto reporting beneficial ownership of five
percent or less of such class.) (See Rule 13d-7.)

Note: Six copies of this statement, including all exhibits, should be
filed with the Commission. See Rule 13d-1(a) for other parties to whom
copies are to be sent.

*The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which
would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities
Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of
that section of the Act but shall be subject to all other provisions of
the Act (however, see the Notes).


                                   Page 1 of 11
<PAGE>


CUSIP No.  895930105                                          Schedule 13D
- - ---------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    Suez Lyonnaise des Eaux
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                       (a) |X|
                                                                       (b) |_|
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
3   SEC USE ONLY
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
4   SOURCE OF FUNDS

    AF
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d) or 2(e)                                                          |_|
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

    Republic of France
- - ---------------------------------------------------------------------------
             --------------------------------------------------------------
             7   SOLE VOTING POWER

 NUMBER OF             6,507,944

             --------------------------------------------------------------
             --------------------------------------------------------------
   SHARES    8   SHARED VOTING POWER
BENEFICIALLY
  OWNED BY             - 0 -
             --------------------------------------------------------------
             --------------------------------------------------------------
    EACH     9   SOLE DISPOSITIVE POWER
 REPORTING
   PERSON              6,507,944
             --------------------------------------------------------------
             --------------------------------------------------------------
    WITH     10  SHARED DISPOSITIVE POWER

                       -0-
             --------------------------------------------------------------
- - ---------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           6,507,944
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
                                                                          |_|

- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           52.5%
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON

           OO
- - ---------------------------------------------------------------------------


                                   Page 2 of 11
<PAGE>

     CUSIP No.  895930105                                          Schedule 13D
- - ---------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    Elyo S.A.
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                      (a) |X|
                                                                      (b) |_|
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
3   SEC USE ONLY
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
4   SOURCE OF FUNDS

    AF, WC
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d) or 2(e)                                                            |_|
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

    Republic of France
- - ---------------------------------------------------------------------------
             --------------------------------------------------------------
             7   SOLE VOTING POWER

 NUMBER OF             6,507,944

             --------------------------------------------------------------
             --------------------------------------------------------------
   SHARES    8   SHARED VOTING POWER
BENEFICIALLY
  OWNED BY             - 0 -
             --------------------------------------------------------------
             --------------------------------------------------------------
    EACH     9   SOLE DISPOSITIVE POWER
 REPORTING
   PERSON              6,507,944
             --------------------------------------------------------------
             --------------------------------------------------------------
    WITH     10  SHARED DISPOSITIVE POWER

                       -0-
             --------------------------------------------------------------
- - ---------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           6,507,944
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
                                                                           |_|
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           52.5%
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON

           OO
- - ---------------------------------------------------------------------------


                                   Page 3 of 11
<PAGE>

CUSIP No.  895930105                                          Schedule 13D
- - ---------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    Cofreth American Corporation      51-0262996
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                       (a) |X|
                                                                       (b) |_|
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
3   SEC USE ONLY
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
4   SOURCE OF FUNDS

    AF, WC
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d) or 2(e)                                                           |_|
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

    Delaware (USA)
- - ---------------------------------------------------------------------------
             --------------------------------------------------------------
             7   SOLE VOTING POWER

 NUMBER OF             4,870,670

             --------------------------------------------------------------
             --------------------------------------------------------------
   SHARES    8   SHARED VOTING POWER
BENEFICIALLY
  OWNED BY             - 0 -
             --------------------------------------------------------------
             --------------------------------------------------------------
    EACH     9   SOLE DISPOSITIVE POWER
 REPORTING
   PERSON              4,870,670
             --------------------------------------------------------------
             --------------------------------------------------------------
    WITH     10  SHARED DISPOSITIVE POWER

                       -0-
             --------------------------------------------------------------
- - ---------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           4,870,670
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
                                                                           |_|


- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           39.3%
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON

           CO
- - ---------------------------------------------------------------------------

                                   Page 4 of 11
<PAGE>


CUSIP No.  89530105                                           Schedule 13D
- - ---------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    Compagnie Parisienne de Chauffage Urbain
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                       (a)|X|
                                                                       (b)|_|
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
3   SEC USE ONLY
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
4   SOURCE OF FUNDS

    AF
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d) or 2(e)    |_|
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

    Republic of France
- - ---------------------------------------------------------------------------
             --------------------------------------------------------------
             7   SOLE VOTING POWER

 NUMBER OF             1,637,274

             --------------------------------------------------------------
             --------------------------------------------------------------
   SHARES    8   SHARED VOTING POWER
BENEFICIALLY
  OWNED BY             - 0 -
             --------------------------------------------------------------
             --------------------------------------------------------------
    EACH     9   SOLE DISPOSITIVE POWER
 REPORTING
   PERSON              1,637,274
             --------------------------------------------------------------
             --------------------------------------------------------------
    WITH     10  SHARED DISPOSITIVE POWER

                       -0-
             --------------------------------------------------------------
- - ---------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,637,274
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
                                                                           |_|
          
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           13.2%
- - ---------------------------------------------------------------------------
- - ---------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON

           OO
- - ---------------------------------------------------------------------------


                                   Page 5 of 11
<PAGE>

Item 2.    Identity and Background

           (a)  Name

                Suez Lyonnaise des Eaux ("Lyonnaise")
                Elyo S.A., formerly Ufiner-Cofreth, S.A. ("Elyo")
                Cofreth American Corporation ("CAC")
                Compagnie Parisienne de Chauffage Urbain ("CPCU")

           (b)  Business Address

                Suez Lyonnaise des Eaux
                1 rue d'Astorg
                Paris 75008 France

                Elyo S.A.
                235, Avenue Georges Clemenceau
                Nanterre 92022 France

                Cofreth American Corporation
                One Water Street
                White Plains, New York 10601

                Compagnie Parisienne de Chauffage Urbain
                185, Rue de Bercy
                Paris 75561 France

           (c)  The  principal  business of  Lyonnaise  is in  services,
                including water,  energy,  waste  management,  media and
                communications  and in construction,  including building
                and civil engineering,  concessionary  operations,  road
                building and industrial activities.

                The   principal   business  of  Elyo  is  Operation  and
                Maintenance,.         District        Heating        and
                Cooling/Cogeneration/Energy    from   waste,   gas   and
                electricity.

                The  principal  business  of  CPCU is the  Operation  of
                District Heating plants in Paris, France.

                The  principal  business  of CAC is  the  Operation  and
                Maintenance in the United States,  District  Heating and
                Cooling/Cogeneration/Energy from waste.

           (d)  None  of  Lyonnaise,   Elyo,   CPCU  or  CAC  have  been
                convicted in a criminal  proceeding within the last five
                years.

           (e)  Within the last five  years,  none of  Lyonnaise,  Elyo,
                CPCU  or  CAC  have  been   convicted   in  a   criminal
                proceeding before a judicial or  administrative  body of
                competent  jurisdiction  wherein  as a  result  of  such
                proceeding   any  of  them  was  or  is   subject  to  a
                judgment.,   decree  or  final  order  enjoining  future
                violations of, or  prohibiting  or mandating  activities
                subject to, Federal or State  securities laws or finding
                any violation with respect to such laws.



                                   Page 6 of 11
<PAGE>

Item 5.    Interest in Securities of the Issuer.

           Lyonnaise and Elyo

           (a)  Amount Beneficially Owned                             6,507,944

           Percent of Class
                                                                          52.5%
 
           (b)  Number of shares as to which such person has:

                (i)  sole power to vote or direct the vote
                                                                      6,507,944

                (ii) shared power to vote or direct the vote
                                                                          - 0 -

                (iii) sole power to dispose or to direct the 
                      disposition of                                  6,507,944

                (iv) shared power to dispose or to direct the
                     disposition of                                       - 0 -

                CAC

           (a)  Amount Beneficially Owned
                                                                      4,870,670
                Percent of Class
                                                                          39.3%

           (b)  Number of shares as to which such person has:

                (i)  sole power to vote or to direct the vote
                                                                      4,870,670

                (ii) shared power to vote or to direct the vote
                                                                          - 0 -

                (iii)sole power to dispose or to direct the
                     disposition of                                   4,870,670

                (iv) shared power to dispose or to direct the
                     disposition of                                       - 0 -

                CPCU

           (a)  Amount Beneficially Owned
                                                                      1,637,274
                Percent of Class
                                                                          13.2%

           (b)  Number of shares as to which such person has:

                (i)  sole power to vote or to direct the vote
                                                                      1,637,274

                (ii) shared power to vote or to direct the vote           - 0 -


                                   Page 7 of 11
<PAGE>

                (iii)sole power to dispose or to direct the
                     disposition of                                   1,637,274

                (iv) shared power to dispose or to direct the
                     disposition of                                       - 0 -

           (c)  Not applicable.
 
           (d)  No person except for  Lyonnaise,  Elyo, CAC and CPCU, is
                known to have a right to  receive or the power to direct
                the receipt of dividends  from, or the proceeds from the
                sale of, the Common Stock owned by CAC and CPCU.

           (e)  Not applicable.

           (f)  Citizenship.

                Lyonnaise,  Elyo and CPCU are  organized  under the laws
                of  the   Republic   of   France.   CAC  is  a  Delaware
                corporation.

Item 6.    Contracts,  Arrangements,   Understandings  or  Relationships
           with Respect to Securities of the Issuer.

           CAC,  CPCU,  Elyo  and  Lyonnaise  may be  deemed  to  form a
           group.  Lyonnaise  owns 98% of the  outstanding  voting stock
           of Elyo. Elyo directly owns 76.9% of the  outstanding  voting
           stock of CAC and may be deemed to own  beneficially  89.6% of
           the  outstanding  voting stock of CAC due to its ownership of
           stock in certain other entities  which are themselves  owners
           of  outstanding  voting stock of CAC. CPCU is a subsidiary of
           Elyo,  which owns 64.5% of the  outstanding  voting  stock of
           CPCU.  CAC and  CPCU  will  most  likely  take  actions  in a
           concerted manner.

           CAC and CPCU  (collectively,  the  "Companies") and Thomas R.
           Casten,  Richard  E.  Kessel,  Michael  Weiser  and Eugene E.
           Murphy (collectively.,  the "Management Stockholders") may be
           deemed   to  have   formed  a  group  as  a  result   of  the
           Stockholders  Agreement dated as of August 10, 1994,  entered
           into among these  parties,  pursuant  to which the  Companies
           could  direct the voting of the  Management  Stockholders  in
           certain   circumstances.   The  voting   obligations  of  the
           Management  Stockholders  under  the  Stockholders  Agreement
           expired  on August  10,  1997.  Accordingly,  the  Management
           Stockholders'  shares (1,515,745) are no longer  beneficially
           owned by the Companies.

Item 4.         Material to be Filed as Exhibits

           None.

                                   Page 8 of 11

<PAGE>

                               SIGNATURE

      After  reasonable  inquiry  and to the  best of my  knowledge  and
belief,  I certify that the  information  set forth in this statement is
true, complete and correct.


Date:  April 7, 1998           SUEZ LYONNAISE DES EAUX


                               By: /s/ Ray A. Mantle                      
                                    Ray A. Mantle*
                                    Attorney-in-Fact

Date:  April 7, 1998           ELYO S.A.


                               By: /s/ Ray A. Mantle                       
                                    Ray A. Mantle*
                                    Attorney-in-Fact


Date:  April 7, 1998           COFRETH AMERICAN CORPORATION


                               By:/s/ Ray A. Mantle                       
                                    Ray A. Mantle*
                                    Attorney-in-Fact


Date:  April 7, 1998           COMPAGNIE PARISIENNE DE
                               CHAUFFAGE URBAIN


                               By: /s/ Ray A. Mantle                       
                                    Ray A. Mantle*
                                    Attorney-in-Fact

_____________________________


* Signed pursuant to a Power of Attorney dated March 31, 1998.

* See Power of Attorney filed October 10, 1996 with Schedule 13D, hereby 
  incorporated by reference.



                                   Page 9 of 11

<PAGE>

                         POWER OF ATTORNEY

      COMPAGNIE  PARISIENNE DE CHAUFFAGE  URBAIN hereby  authorizes
any of RAY A. MANTLE or GARRY P.  McCORMACK,  acting alone, to sign
and  file  with  the  Securities  and  Exchange  Commission  on its
behalf  Form 4, Form 5,  Schedule  13-D and  Schedule  13-G and any
amendments  thereto,  relating to its actual and deemed  beneficial
ownership  of shares of TRIGEN  ENERGY  CORPORATION.  This Power of
Attorney  is valid for twelve  (12)  months from the date set forth
below.

                     COMPAGNIE PARISIENNE DE CHAUFFAGE URBAIN


                     By:  /s/ Philippe Rappeneau        
                          Name:  Philippe Rappeneau
                          Title: President

Date: March 31, 1998


                         POWER OF ATTORNEY

      ELYO S.A hereby  authorizes  any of RAY A. MANTLE or GARRY P.
McCORMACK,  acting alone,  to sign and file with the Securities and
Exchange  Commission  on its behalf Form 4, Form 5,  Schedule  13-D
and  Schedule  13-G and any  amendments  thereto,  relating  to its
actual and deemed  beneficial  ownership of shares of TRIGEN ENERGY
CORPORATION.  This  Power of  Attorney  is valid  for  twelve  (12)
months from the date set forth below.

                          ELYO S.A.
 
                          By:  /s/ Michel Bleitrach          
                               Name:  Michel Bleitrach
                               Title: President
Date:  March 31, 1998

                                   Page 10 of 11
<PAGE>

                         POWER OF ATTORNEY

      SUEZ  LYONNAISE  DES  EAUX  hereby  authorizes  any of RAY A.
MANTLE or GARRY P.  McCORMACK,  acting alone, to sign and file with
the Securities  and Exchange  Commission on its behalf Form 4, Form
5,  Schedule  13-D and Schedule  13-G and any  amendments  thereto,
relating to its actual and deemed  beneficial  ownership  of shares
of TRIGEN  ENERGY  CORPORATION.  This  Power of  Attorney  is valid
for twelve (12) months from the date set forth below.

                          SUEZ LYONNAISE DES EAUX
 

                          By:  /s/ Michel Cassou              
                               Name:  Michel Cassou
                               Title: Managing Director

Date:  March 31, 1998

       
                              POWER OF ATTORNEY
          
      COFRETH AMERICAN  CORPORATION hereby authorizes any of RAY A.
MANTLE or GARRY P.  McCORMACK,  acting alone, to sign and file with
the Securities  and Exchange  Commission on its behalf Form 4, Form
5,  Schedule  13-D and Schedule  13-G and any  amendments  thereto,
relating to its actual and deemed  beneficial  ownership  of shares
of TRIGEN  ENERGY  CORPORATION.  This  Power of  Attorney  is valid
for twelve (12) months from the date set forth below.


                     COFRETH AMERICAN CORPORATION


                     By:  /s/ Jean Malahieude           
                          Name:  Jean Malahieude
                          Title: Executive Vice President
Date:  March 31, 1998


                                   Page 11 of 11



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