EXHIBIT 10.13.1 Tenneco Energy 1010 Milam Street P0 Box 2511 Houston, Texas 77252 2511 Tel 713 757 2131 [LOGO] TENNECO December 28, 1995 Energy ESSEX COUNTY GAS COMPANY 7 North Hunt Street P.O. Box 500 Amesbury, MA 01913 Attention: Allen R. Neale Vice President, Supply Planning Dear Allen: Re: Amendment No. 1 to Gas Transportation Agreement Dated September 1, 1993 Service Package No. 2065 TENNESSEE GAS PIPELINE COMPANY and ESSEX COUNTY GAS COMPANY agree to amend the Gas Transportation Agreement, effective July 1, 1995, to change the Transportation Quantity from 1,033 dekatherms to 645 dekatherms. Except as amended herein, all terms and provisions of the Agreement shall remain in full force and effect as written. If the foregoing is in accordance with your understanding of the Agreement, please so indicate by signing and returning to my attention both originals of this letter. Upon Tennessee's execution, an original will be forwarded to you for your files. If I may be of further assistance, please contact me at (713) 757-3636. Your prompt cooperation to this matter is greatly appreciated. Sincerely, /s/ Paige Metersky Paige Metersky Customer Service Representative PM/egg Enclosures cc: K. Haas - w/enc. M. Sprague - w/enc. ESSEX COUNTY GAS COMPANY December 28, 1995 Page 2 Service Package 2065 Amendment No. 1 Amendment Effective Date: July 1, 1995 ACCEPTED AND AGREED TO this _____ day of ___________, 1995. TENNESSEE GAS PIPELINE COMPANY By: __________________________________ Agent and Attorney-in-Fact ACCEPTED AND AGREED TO this _____ day of ___________, 1995. ESSEX COUNTY GAS COMPANY By: __________________________________ Agent and Attorney-in-Fact