Exhibit 10vv (LETTERHEAD OF TENNESSEE GAS PIPELINE APPEARS HERE) August 25, 1995 Mr. Ken A. Royse Chattanooga Gas Company 6125 Preservation Drive Chattanooga, TN 37416 RE: Amendment No. 2 to Gas Storage Agreement Dated December 1, 1994 Service Package No. 3947 Dear Mr. Royse: Enclosed for retention is a fully executed original of Amendment No. 2 to Service Package No. 3947 dated December 1, 1994 referenced above. If you have any questions, please do not hesitate to contact me at (713) 757-3614. Sincerely, TENNESSEE GAS PIPELINE COMPANY /s/ Rick Lisenbe Rick Lisenbe Southern Accounts RL/mdm Enclosure (LETTERHEAD OF TENNESSEE GAS PIPELINE APPEARS HERE) August 9, 1995 Mr. Ken A. Royse Chattanooga Gas Company 6125 Preservation Drive Chattanooga, TN 37416 Re: Amendment No. 2 to Gas Storage Contract Dated December 1, 1994 Service Package No. 3947 Dear Mr. Royse: TENNESSEE GAS PIPELINE COMPANY (Transporter) AND CHATTANOOGA GAS COMPANY (Shipper) agree to amend the above referenced gas storage contract effective July 1, 1995, to increase the Maximum Daily Withdrawal Quantity (MDWQ) when Shipper's storage balance is equal to or less than 30% of the Maximum Storage Quantity (MSQ) and 20% of the MSQ, respectively, as reflected in the attached Exhibit A-1 and as described below. The parties agree to amend Article I of the subject gas storage contract as follows: Following the commencement of services hereunder, in accordance with the terms of Transporter's Rate Schedule FS, and of this Agreement, Transporter shall receive for injection for Shipper's account a daily quantity of gas up to Shipper's Maximum Injection Quantity of 5,682 dekatherms (Dth) and Maximum Storage Quantity (MSQ) of 852,286 (Dth) (on a cumulative basis) and on demand shall withdraw from Shipper's storage account and deliver to Shipper a daily quantity of gas up to Shipper's Maximum Daily Withdrawal Quantity (MDWQ) of 7,741 Dth; provided however, that when Shipper's storage balance is equal to or less than 30% of the MSQ but greater than 20% of the MSQ, the Maximum Daily Withdrawal Quantity shall be 6,314 Dth; and provided further, that when Shipper's storage balance is less than or equal to 20% of the MSQ, the Maximum Daily Withdrawal Quantity shall be 6,314 Dth. For demand charge proposes, the MDWQ for balances greater than 30% of the MSQ shall be used. Except as amended herein, all terms and provisions of the above referenced gas storage contract shall remain in full force and effect as written. If the foregoing is in accordance with your understanding of our 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. CHATTANOOGA GAS COMPANY August 9, 1995 Service Package No.: 3947 Amendment Number: 2 Amendment Effective Date: July 1, 1995 Page -2- Should you have any questions, please do not hesitate to contact me at (713) 757-3614. Sincerely, /s/ Rick Lisenbe Rick Lisenbe Southern Accounts ACCEPTED AND AGREED TO This 23rd day August, 1995. TENNESSEE GAS PIPELINE COMPANY By: /s/ Lawrence G. Williams Title: Agent and Attorney-in-Fact Date: 8/23/95 ACCEPTED AND AGREED TO This 15th day August, 1995. CHATTANOOGA GAS COMPANY By: /s/ Kenneth A. Royse Title: President Date: 8/15/95 GAS STORAGE SERVICE AGREEMENT EXHIBIT "A" TO FIRM GAS STORAGE SERVICE AGREEMENT DATED DECEMBER 1, 1994 BETWEEN TENNESSEE GAS PIPELINE COMPANY AND CHATTANOOGA GAS COMPANY SERVICE PACKAGE: 3947 AMENDMENT: 2 SERVICE PACKAGE MSQ: 852,286 MAXIMUM DAILY INJECTION QUANTITY: 5,682 MAXIMUM DAILY WITHDRAWAL QUANTITY (MDWQ): 7,741 STORAGE BALANCE STORAGE BALANCE MAXIMUM DAILY WITHDRAWAL FROM DTH TO DTH QUANTITY DTH Ratchet 0 from 255,687 Ratchet 0 to 852,286 Ratchet 0 7,741 Ratchet I from 170,458 Ratchet I to 255,686 Ratchet I 6,314 Ratchet II from 0 Ratchet II to 170,457 Ratchet II 6,314 SERVICE POINT: Compressor Station 87 - Portland INJECTION METER: 060020 WITHDRAWAL METER: 070020 STORAGE STORAGE BALANCE BALANCE MDWQ\ METER METER NAME COUNTY ST ZONE I/W LEG FROM TO MDIQ 070020 TGP-Portland Sumner TN 01 W 100 Ratchet 0 Ratchet 0 Ratchet 0 7,741 Storage Withdrawal from 255,687 to 852,286 Ratchet I Ratchet I Ratchet I 6,314 from 170,458 to 255,686 Ratchet II Ratchet II Ratchet II 6,314 from 0 to 170,457 060020 TGP-Portland Sumner TN 01 I 100 5,682 Storage Injection