July 25, 1988 Mr. Robert A. Shinn Vice President O'Brien Energy Systems 225 S. Eighth Street Philadelphia, PA 19106 Dear Bob: This letter hereby acknowledges the O'Brien Energy Systems and E. I. du Pont de Nemours & Co. mutually agree to extend the...

                                                            Exhibit 10.20.3




                                                              July 25, 1988
                                                                           
                                                                           
                                                                           
Xx. Xxxxxx X. Xxxxx
Vice President
O'Brien Energy Systems
000 X. Xxxxxx Xxxxxx
Xxxxxxxxxxxx, XX 00000

Dear Xxx:

     This letter hereby acknowledges the O'Brien Energy Systems and E. I.
du Pont de Nemours & Co. mutually agree to extend the required date by
which O'Brien must obtain all necessary permits to October 1, 1988, as is
defined in Paragraph 2 of the Amendment #1 to the Steam Purchase contract
for the proposed Xxxxxx, NJ Cogeneration Project, dated January 12, 1988.

     If you have any questions or need additional information, please call.

     Sincerely,

     /s/ X. X. Xxxxxx

     X. X. Xxxxxx
     Senior Purchasing Agent



cc:  Xxxx Xxxxxx - Du Pont