Exhibit 10ww (LETTERHEAD OF TENNESSEE GAS PIPELINE APPEARS HERE) September 26, 1995 Mr. Kenneth Royse Chattanooga Gas Company 6125 Preservation Drive Chattanooga, TN 37416 Dear Mr. Royse: Attached for your records is the fully executed amendment to Chattanooga's TGP Storage Agreement No. 3999 for the increase in deliverability. If you have questions, please give me a call at (423) 694-1679 or Rick Lisenbe at (713) 757-3614. Best regards, /s/ Margie Klepper Margie Klepper Central Region Attachments CHATTANOOGA GAS COMPANY August 10,1995 Page 2 Contract Number: 3999 Amendment number: 1 Amendment effective date: July 1, 1995 ACCEPTED AND AGREED TO This 21st Day of August, 1995 TENNESSEE GAS PIPELINE COMPANY By: /s/ Lawrence G. Williams Title: Agent and Attorney-in-Fact ACCEPTED AND AGREED TO This 15th Day of August, 1995 CHATTANOOGA GAS COMPANY By: /s/ Kenneth A. Royse, President Title: Agent and Attorney-in-Fact GAS STORAGE SERVICE AGREEMENT EXHIBIT "A" AMENDMENT #1 TO GAS STORAGE SERVICE AGREEMENT DATED November 1, 1993 BETWEEN TENNESSEE GAS PIPELINE COMPANY AND CHATTANOOGA GAS CO CHATTANOOGA GAS CO EFFECTIVE DATE OF AMENDMENT: July 1, 1995 RATE SCHEDULE: FS SERVICE PACKAGE: 3999 SERVICE PACKAGE MSQ: 197,390 WITHDRAWAL QUANTITY: 1,359 INJECTION QUANTITY: 1,316 SERVICE POINT: PORTLAND METER METER NAME COUNTY ST ZONE I/W LEG TOTAL- BILLABLE- TQ TQ 060020 TGP-PORTLAND SUMNER TN 01 I 100 1,316 1,316 STORAGE INJECTION Total Injection TQ: 1,316 1,316 070020 TGP-PORTLAND SUMNER TN 01 W 100 1,359 1,359 STORAGE WITHDRAWAL Total Withdrawal TQ: 1,359 1,359 NUMBER OF INJECTION POINTS: 2 NUMBER OF WITHDRAWAL POINTS: 2 Note: Exhibit "A" is a reflection of the contract and all amendments as of the amendment effective date. GAS STORAGE SERVICE AGREEMENT EXHIBIT "A-1" SHOWING REQUESTED CHANGES AMENDMENT #1 TO GAS STORAGE SERVICE AGREEMENT DATED November 1, 1993 BETWEEN TENNESSEE GAS PIPELINE COMPANY AND CHATTANOOGA GAS CO CHATTANOOGA GAS CO EFFECTIVE DATE OF AMENDMENT: July 1, 1995 RATE SCHEDULE: FS SERVICE PACKAGE: 3999 SERVICE PACKAGE MSQ: 0 WITHDRAWAL QUANTITY: 26 INJECTION QUANTITY: 0 SERVICE POINT: PORTLAND METER METER NAME COUNTY ST ZONE I/W LEG TOTAL- BILLABLE- TQ TQ Total Injection TQ: 0 0 070020 TGP-PORTLAND SUMNER TN 01 W 100 26 26 STORAGE WITHDRAWAL Total Withdrawal TQ: 26 26 NUMBER OF INJECTION POINTS AFFECTED: 1 NUMBER OF WITHDRAWAL POINTS AFFECTED: 2