CERTIFICATE OF FORMATION

                                       OF

                    Trigen-Cinergy Solutions of San Diego LLC

     The  undersigned,  being a natural  person of age  eighteen  years or more,
acting as an organizer of a limited liability company under the Delaware Limited
Liability Company Act (as the same may be amended from time to time, the "Act"),
adopts,  pursuant to Section  18-201 of the Act, the  following  Certificate  of
Formation for such limited liability company (the "Company"):

                                    ARTICLE I

                                      NAME

                        The name of the Company shall be:
                    Trigen-Cinergy Solutions of San Diego LLC

                                   ARTICLE II

                       REGISTERED OFFICE, REGISTERED AGENT

     The initial  registered office of the Company shall be: c/o The Corporation
Trust Company,  Corporation Trust Center,  1209 Orange Street,  Wilmington,  New
Castle County,  Delaware  19801, or such other location as the members by mutual
consent shall determine.  The initial  registered agent of the Company shall be:
The Corporation  Trust Company,  Corporation  Trust Center,  1209 Orange Street,
Wilmington,  New Castle County,  Delaware  19801,  or such other location as the
members by mutual consent shall determine.  Either the registered  office or the
registered agent may be changed in the manner provided by law.

                                   ARTICLE III

                               PERIOD OF DURATION

     The Company shall exist until dissolved according to law or by the terms of
the Operating Agreement (defined in Article VI).

                                   ARTICLE IV

                                     POWERS

     Except as restricted  by the  Certificate  of Formation,  the Company shall
have and may exercise all powers and rights,  which a limited  liability company
may exercise legally pursuant to the Act. ARTICLE V

                                   AMENDMENTS

     The Company  reserves the right to amend its  Certificate of Formation from
time to time in accordance with the Act,  provided,  that the unanimous approval
of the members of the Company to such amendment has been duly obtained.

                                   ARTICLE VI

                         ADOPTION OF OPERATING AGREEMENT

     The  initial  Limited  Liability  Company  Agreement  of the  Company  (the
"Operating  Agreement") shall be adopted by its members. The Operating Agreement
may contain any  provisions  for the regulation and management of the affairs of
the Company not inconsistent with law or this Certificate of Formation.

     The undersigned does hereby certify,  make and acknowledge this Certificate
of Formation on this 18th day of November, 1999.



                                                            /s/ Leonard M. Saari
                                                            --------------------
                                                             Leonard M. Saari
                                                             Authorized Person