Exhibit 10b (LETTERHEAD OF TENNESSEE GAS PIPELINE/TENNECO ENERGY APPEARS HERE) December 14, 1995 Chattanooga Gas Company 303 Peachtree Street Atlanta, GA 30308-4239 Attn: Debbie McNeely Dear Debbie: This letter sets forth our agreement with respect to the amendments of the Firm Storage Agreements No. 2027 and 3999 between Tennessee Gas Pipeline (TGP) and Chattanooga Gas Company (the "Parties"). Our agreement is as follows: 1. The Agreement No. 3999 is hereby amended to increase the Maximum Storage Quantity (MSQ) by 1,845,000 Dth effective January 1, 1996. 2. The Agreement No. 3999 is hereby amended to increase the Maximum Daily Withdrawal (MDQ) on meter number 07-0020 (TGP-Portland Storage Withdrawal) by 12,300 Dth/d effective January 1, 1996. 3. The Agreement No. 3999 is hereby amended to increase the Maximum Daily Injection (MDI) on meter number 06-0020 (TGP-Portland Storage Injection) by 12,300 Dth/d effective January 1, 1996. 4. The Agreement No. 2027 is hereby terminated effective December 31, 1995. Please acknowledge your acceptance of the amendments by signing below and returning to my attention the duplicate originals of the letter. Upon execution by TGP, an original will be forwarded to your for your files. Sincerely, /s/ Craig S. Harris Craig S. Harris Sr. Customer Service Representative TENNESSEE GAS PIPELINE By: /s/ L. G. Williams Director, Transportation Services Central Region ATLANTA GAS LIGHT COMPANY By: /s/ Steven J. Gunther Date: December 19, 1995