TRIGEN ENERGY CORP
SC 13D, 1996-10-10
STEAM & AIR-CONDITIONING SUPPLY
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  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)

                                September 30, 1996
             ------------------------------------------------------
             (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 13
<PAGE>

  
CUSIP No.  895930105                                               Schedule 13D

- --------------------------------------------------------------------------------
1      NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

       Societe 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                         6,317,944

                      ------- --------------------------------------------------
                      ------- --------------------------------------------------
       SHARES         8       SHARED VOTING POWER
    BENEFICIALLY
      OWNED BY                         1,511,432
                      ------- --------------------------------------------------
                      ------- --------------------------------------------------
        EACH          9       SOLE DISPOSITIVE POWER
     REPORTING
       PERSON                          6,317,944
                      ------- --------------------------------------------------
                      ------- --------------------------------------------------
        WITH          10      SHARED DISPOSITIVE POWER

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

                  7,829,376
- -------- -----------------------------------------------------------------------
- -------- -----------------------------------------------------------------------
12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
         SHARES                                                             |_|
 
- -------- -----------------------------------------------------------------------
- -------- -----------------------------------------------------------------------
13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                  65.6%
- -------- -----------------------------------------------------------------------
- -------- -----------------------------------------------------------------------
14       TYPE OF REPORTING PERSON

                  OO
- -------- -----------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1--7
       (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION

                                  Page 2 of 13
<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                         6,317,944

                      ------- --------------------------------------------------
                      ------- --------------------------------------------------
       SHARES         8       SHARED VOTING POWER
    BENEFICIALLY
      OWNED BY                         1,511,432
                      ------- --------------------------------------------------
                      ------- --------------------------------------------------
        EACH          9       SOLE DISPOSITIVE POWER
     REPORTING
       PERSON                          6,317,944
                      ------- --------------------------------------------------
                      ------- --------------------------------------------------
        WITH          10      SHARED DISPOSITIVE POWER

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

                  7,829,376
- -------- -----------------------------------------------------------------------
- -------- -----------------------------------------------------------------------
12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) 
         EXCLUDES CERTAIN SHARES                                           |_|
- -------- -----------------------------------------------------------------------
- -------- -----------------------------------------------------------------------
13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                  65.6%
- -------- -----------------------------------------------------------------------
- -------- -----------------------------------------------------------------------
14       TYPE OF REPORTING PERSON

                  OO
- -------- -----------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1--7
       (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION

                                  Page 3 of 12
<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                         4,680,670

                      ------- --------------------------------------------------
                      ------- --------------------------------------------------
       SHARES         8       SHARED VOTING POWER
    BENEFICIALLY
      OWNED BY                         1,511,432
                      ------- --------------------------------------------------
                      ------- --------------------------------------------------
        EACH          9       SOLE DISPOSITIVE POWER
     REPORTING
       PERSON                          4,680,670
                      ------- --------------------------------------------------
                      ------- --------------------------------------------------
        WITH          10      SHARED DISPOSITIVE POWER

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

                  6,192,102
- -------- -----------------------------------------------------------------------
- -------- -----------------------------------------------------------------------
12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) 
         EXCLUDES CERTAIN SHARES                                           |_|


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

                  51.8%
- -------- -----------------------------------------------------------------------
- -------- -----------------------------------------------------------------------
14       TYPE OF REPORTING PERSON

                  CO
- -------- -----------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1--7
       (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION

                                  Page 4 of 13
<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                         1,511,432
                      ------- --------------------------------------------------
                      ------- --------------------------------------------------
        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

                  3,148,706
- -------- -----------------------------------------------------------------------
- -------- -----------------------------------------------------------------------
12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) 
         EXCLUDES CERTAIN SHARES                                           |_|


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

                  26.4%
- -------- -----------------------------------------------------------------------
- -------- -----------------------------------------------------------------------
14       TYPE OF REPORTING PERSON

                  OO
- -------- -----------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1--7
       (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION

                                  Page 5 of 13
<PAGE>

Item 1.           Security and Issuer
                  Common Stock, par value $.01 per share ("Common Stock")

                  CUSIP Number
                  895930105
 
                  Trigen Energy Corporation ("Trigen")
                  One Water Street
                  White Plains, New York  10601

Item 2.           Identity and Background

                  (a)      Name

                           Societe 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

                           Societe Lyonnaise des Eaux
                           72, Avenue de la Liberte
                           Nanterre 92022  France

                           Elyo S.A.
                           235, Avenue Georges Clemenceau
                           Nanterre 92000  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/Cogenera-
                           tion/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 party to a civil proceeding  
                           before a judicial or administrative body of com-
                           petent 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 activi-
                           ties subject to, Federal or State securities laws 
                           or finding any violation with respect to such laws.

                                  Page 6 of 13
<PAGE>

Item 3.           Source and Amount of Funds or Other Consideration.

                  On September 30, 1996, CAC purchased 240,000 shares of 
                  Common Stock from Trigen at a price of $21.25 per share,  
                  or $5.1 Million in total.  Elyo loaned the funds to CAC on 
                  an intercompany basis.  Elyo has loaned funds to CAC in the
                  past to permit it to respond quickly to business opportuni-
                  ties; although there is no firm commitment that Elyo will 
                  make such loans, CAC anticipates that Elyo will advance funds
                  for purposes consistent with CAC's and Elyo's business plans.
                  The loan to purchase the 240,000 shares of Trigen Common 
                  Stock is an open account transaction, without collateral or 
                  any loan documentation beyond a book entry.  The interest  
                  rate and repayment terms have not been settled at this time.  
                  Elyo used its own funds for the advance to CAC.

                  On September 30, 1996, CAC purchased 7,000 shares each from 
                  Raymond Roux and from Jean-Paul Paufique at a price of $22.50
                  per share, or $315,000 in total.  CAC used its own funds from
                  working capital for these purchases.

Item 4.           Purposes of Transaction.

                  Lyonnaise, Elyo, CAC and CPCU as a group had initially  
                  acquired 6,063,944 shares of Trigen's Common Stock prior to 
                  the initial public offering of Trigen in August 1994, as 
                  reported in a Schedule 13G filed in February 1995. As part 
                  of the arrangements made in August 1994 in connection with 
                  Trigen's initial public offering, the group obtained shared 
                  voting power over an additional 1,484,528 shares of Trigen's
                  Common Stock.  See Item 6 below for a further description of
                  this shared voting power.  Subsequently, Mr. Ludwig sold all
                  of his shares, and the other Management Stockholders acquired
                  additional shares, so that the total number of shares subject
                  to this shared voting power incresed to 1,511,432.

                  CAC acquired the 240,000  shares of Common Stock  purchased
                  from Trigen on September 30, 1996 to maintain its relative 
                  percentage ownership in view of Trigen's issuance of 200,000
                  shares of Common Stock to Trust Company of the West in 
                  payment of debt of a wholly-owned subsidiary of Trigen, 
                  Trigen Lindbergh Corporation.  Under its present business 
                  plan, Elyo intends to remain indirectly a major shareholder 
                  of Trigen through CAC's and CPCU's ownership of Common Stock.
                  CAC's purchase of the 240,000 shares of Common Stock was in 
                  furtherance of this policy.

                  CAC purchased the 14,000 shares of Common Stock from Messrs.
                  Roux and Paufique for the same purpose of maintaining its  
                  relative position as a major shareholder of Trigen.  Messrs.
                  Roux and Paufique had exercised options to purchase a total 
                  of 20,000 shares.  They intended to sell 14,000 shares, so 
                  CAC purchased them under Elyo's policy described above.

                                  Page 7 of 13
<PAGE>

Item 5.           Interest in Securities of the Issuer.

                  Lyonnaise and Elyo
<TABLE>         
                  <S>                                                                            <C>
                  (a)      Amount Beneficially Owned                                             7,829,376

                           Percent of Class                                                          65.6%
 
                  (b)      Number of shares as to which such person has:

                           (i)      sole power to vote or direct the vote                        6,318,944

                           (ii)     share power to vote or direct the vote                       1,511,432

                           (iii)    sole power to dispose or to direct the disposition of        6,318,944

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

                           CAC

                  (a)      Amount Beneficially Owned                                             6,192,102

                           Percent of Class                                                          51.8%

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

                           (i)      sole power to vote or to direct the vote                     4,680,670

                           (ii)     shared power to vote or to direct the vote                   1,511,432

                           (iii)    sole power to dispose or to direct the disposition of        4,680,670

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

                           CPCU

                  (a)      Amount Beneficially Owned                                             3,148,706

                           Percent of Class                                                          26.4%

                  (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                   1,511,432

                           (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 pro-
                           ceeds 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.
</TABLE>

                                  Page 8 of 13
<PAGE>

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

                  CAC and CPCU (collectively, the "Companies") and Thomas R.
                  Casten, Richard E. Kessel, John J. Ludwig, Michael Weiser and
                  Eugene E. Murphy (collectively, "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 may 
                  direct the voting of the Management Stockholders in certain 
                  circumstances.  A copy of the Stockholders Agreement was 
                  filed as Exhibit 9 to Trigen's Registration Statement on Form
                  S-1 filed with the SEC on August 11, 1994.  Subsequently, Mr.
                  Ludwig sold all of his shares and is no longer included in
                  the group under the terms of the Stockholders Agreement.

                  CAC, CPCU, Elyo and Lyonnaise may be deemed to form a group. 
                  Lyonnaise owns 78.3% of the outstanding  voting stock of Elyo.
                  Elyo directly owns 72.3% of the outstanding voting stock of 
                  CAC and may be deemed to own beneficially 89% of the out-
                  standing voting stock of CAC due to its ownership of stock in 
                  certain other entities which are themselves owners of out- 
                  standing 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.

Item 7.           Material to be Filed as Exhibits.

                  None.

                                                         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:  October 10, 1996                      SOCIETE LYONNAISE DES EAUX

   
                                             By: /s/ Raymond F. Steckel*
                                                    Attorney-in-Fact


Date:  October 10, 1996                      ELYO S.A.

                                             By:  /s/ Raymond F. Steckel*
                                                      Attorney-in-Fact


Date:  October 10, 1996                      COFRETH AMERICAN CORPORATION

                                             By:  /s/ Raymond F. Steckel*
                                                      Attorney-in-Fact


Date:  October 10, 1996                      COMPAGNIE PARISIENNE DE
                                             CHAUFFAGE URBAIN
 
                                             By:  /s/ Raymond F. Steckel*
                                                      Attorney-in-Fact


* See attached Power of Attorney.

                                  Page 9 of 13
<PAGE>

                                POWER OF ATTORNEY


     COMPAGNIE  PARISIENNE DE CHAUFFAGE  URBAIN hereby  authorizes  any of 
RAYMOND F. STECKEL,  RAY A. MANTLE or GARRY P. McCORMACK,  acting alone, to sign
and file with the Securities and Exchange  Commission on its behalf Form 3, 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:  October 10, 1996

                                  Page 10 of 13
<PAGE>

                                POWER OF ATTORNEY


     ELYO S.A hereby  authorizes  any of RAYMOND F.  STECKEL,  RAY A.  MANTLE or
GARRY P.  McCORMACK,  acting  alone,  to sign and file with the  Securities  and
Exchange  Commission  on its behalf  Form 3, 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: Chairman and CEO

Date:  October 10, 1996

                                 Page 11 of 13
<PAGE>

                                POWER OF ATTORNEY


     SOCIETE LYONNAISE DES EAUX hereby authorizes any of RAYMOND F. STECKEL, RAY
A.  MANTLE  or GARRY  P.  McCORMACK,  acting  alone,  to sign and file  with the
Securities  and  Exchange  Commission  on its  behalf  Form 3,  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.

                                      SOCIETE LYONNAISE DES EAUX
 

                                      By:  /s/ Michel Cassou  
                                      Name:  Michel Cassou
                                      Title: Deputy General Manager

Date:  October 10, 1996

                                 Page 12 of 13
<PAGE>

                                POWER OF ATTORNEY


     COFRETH AMERICAN  CORPORATION  hereby authorizes any of RAYMOND F. STECKEL,
RAY A. MANTLE or GARRY P.  McCORMACK,  acting  alone,  to sign and file with the
Securities  and  Exchange  Commission  on its  behalf  Form 3,  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:  October 4, 1996

                                 Page 13 of 13
<PAGE>



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