Exhibit 10tt AMENDATORY AGREEMENT The Amendment is entered into this 1st day of June, 1995, between SOUTHERN NATURAL GAS COMPANY ("Company") and ATLANTA GAS LIGHT COMPANY ("Shipper"). WITNESSETH: WHEREAS, Company and Shipper are parties to a firm transportation agreement dated November 1, 1994, (#904460) for 259,812 Mcf per day, as amended March 1, 1995 ("FT Agreement"); and WHEREAS, Shipper has released 4,000 Mcf per day of its capacity under the FT Agreement on a permanent basis to the City of Lawrenceville, Georgia, effective June 1,1995; and WHEREAS, the parties wish to memorialize such permanent release through this amendment to the FT Agreement; NOW THEREFORE, in consideration for the premises and the mutual promises and covenants contained herein, the parties agree as follows: 1. The Transportation Demand set forth in Section 1.1 of the FT Agreement shall be revised to be 255,812 Mcf per day effective June 1,1995. 2. Section 4.1 of the FT Agreement shall be deleted in its entirety and the following Section 4.1 substituted therefor: 4.1 Subject to the provisions hereof, this Agreement shall become effective as of the date first hereinabove written and shall be in full force and effect for a primary term through the following dates: (a) April 30, 2007 for 110,905 Mcf per day of Transportation Demand and June 30, 2007 for 1,000 Mcf per day of Transportation Demand, and shall continue and remain in force and effect for successive terms of one year each after the end of each primary term for the specified volume, unless and until cancelled with respect to the associated volume by either party giving 180 days written notice to the other party prior to the end of the specified primary term or any yearly extension thereof; and (b) February 28, 1998, for 143,907 Mcf per day of Transportation Demand, and shall continue and remain in force and effect for successive terms of one year each thereafter if the parties mutually Amendatory Agreement Page 2 agree in writing to each such yearly extension at least 60 days prior to the end of the primary term or subsequent yearly extension. 3. The current Exhibits A and B to the FT Agreement shall be deleted in their entirety and the First Revised Exhibits A and B attached hereto effective June 1, 1995, shall be substituted therefor. 4. Except as provided herein, the FT Agreement shall remain in full force and effect as written and as amended effective March 1,1995. 5. This Amendment is subject to all applicable, valid laws, orders, rules and regulations of any governmental entity having jurisdiction over the parties or the subject matter hereof. WHEREFORE, the parties have executed this Amendment through their duly authorized representatives to be effective as of the date first written above. ATTEST: SOUTHERN NATURAL GAS COMPANY By: By: /s/ Joel Anderson Title: Secretary Title: Vice President ATTEST: ATLANTA GAS LIGHT COMPANY By: /s/ Melanie M. Platt By: /s/ Stephen J. Gunther Title: Corporate Secretary Title: Vice President SERVICE AGREEMENT NO: 904460 EXHIBIT A The legal description of the Receipt Points listed below are more particularly set forth in Company's Receipt Point catalog, a copy of which can be requested from Company or accessed through SoNet, Company's electronic computer system. MDRQ RECEIPT POINT: ZONE in Mcf 016400 MAIN PASS 69 PA 490 017250 GRAND BAY - MID-LOUISIANA EXCHANGE PA 4,968 017400 WEST DELTA 75 - AMOCO (wd 73) PA 17,384 017500 WEST DELTA 105 PA 9,794 018400 MAIN PASS 289 - M.P. 290 - SHELL PA 19,219 018450 VKGC - MAIN PASS 289 TO SNG PA 9,794 018600 SOUTH PASS 62 - SHELL PA 3,918 020400 SOUTH PASS 60 PA 9,794 022400 MISSISSIPPI CANYON 194 PA 28,588 022800 CARTHAGE - UPRC PA 10,420 023500 MAIN PASS 129 - HALL HOUSTON PA 2,774 023800 MAIN PASS 116 - MAXUS PA 14,691 024950 MISSISSIPPI CANYON 268 - ORYX EXCHANGE PA 25,347 026600 WEST DELTA 89 - AGIP PA 1,959 026950 SOUTH PASS 62 - BP EXCHANGE PA 7,595 027400 MAIN PASS 69(FEDERAL) PA 4,652 028050 MAIN PASS 181 - DIAMOND SHAMROCK EXCHANGE PA 2,449 030000 BAYOU SALE - TEXACO - HORSESHOE BAYOU PA 4,897 037000 MISSISSIPPI CANYON 311 PA 9,794 037400 MISSISSIPPI CANYON 268A - EXXON PA 2,449 046040 OAK GROVE #5 - TAURUS 2 3,428 046050 OAK GROVE #2 - BASIN 2 2,449 046070 OAK GROVE #4 - AMOCO 2 490 046080 OAK GROVE #6 - AMOCO 2 3,428 605200 SABINE - HENRY HUB TO SNG PA 13,884 605300 SEA ROBIN - ERATH TO SNG PA 20,617 664000 LRC - WHITE CASTLE TO SNG PA 3,763 690500 BOURBON LINE (FGT) FROM WEST DELTA 152 PA 16,777 /s/ Stephen J. Gunther /s/ Joel Anderson ATLANTA GAS LIGHT COMPANY SOUTHERN NATURAL GAS COMPANY EFFECTIVE DATE: 9/18/95 EXHIBIT B Page No. 1 of 4 ATLANTA GAS LIGHT COMPANY The legal description of the Delivery Points listed below are more particularly set forth in the Company's Delivery Point catalogs, a copy of which can be requested from Company or accessed through SoNet, Company's electronic computer system. This exhibit reflects Maximum Daily Delivery Quantities for FT Service Agreement No. 904460 and FT-NN Service Agreement No. 904461 Delivery Delivery MDDQ Meter Capability Cont. Point Point in Daily Hourly Press. Description Code MCF (Mcf/d) (Mcf/h) (psig) Notes - ---------------- -------- -------- ------------------ ------ ---------- ATLANTA AREA 683600 257,814 A FULTON IND'IAL 910800 48,000 2,000 LINE EAST POINT 911000 20,000 1,000 LINE 200#-335# SO. ATLANTA #1 911300 137,000 8,200 250 SEWELL ROAD 911400 270,000 14,000 LINE < 335#, B SO. ATLANTA #2 911600 172,000 7,165 LINE MARIETTA 912200 33,000 1,500 REG 300#-500# HAMPTON 913000 4,200 252 290 AGL FARM TAPS 907000 CHATSWORTH 907600 2,127 LINE CATOOSA COUNTY 907800 258 300 RINGGOLD 908000 3,814 275 MACON AREA 911500 53,916 A NORTH MACON 915400 50,000 3,000 LINE EAST MACON 915500 27,500 1,700 LINE WEST MACON 915600 14,400 864 LINE MACON-MVILLE#1 915800 89,395 5,360 LINE D MACON-MVILLE#2 915900 60,000 3,600 LINE D JEFFERSONVILLE 918200 2,110 126 LINE > 400# SAVANNAH AREA 911800 69,327 A SAVANNAH #1 934600 30,000 1,800 125 SAVANNAH #2 934700 46,500 2,790 LINE > 225 # SAVANNAH #3 934800 6,000 250 150 SAVANNAH #4 934900 28,800 1,200 LINE > 400 # GRIFFIN 913400 18,750 290 FORSYTH 917200 2,073 LINE ZEBULON 917400 555 LINE THOMASTON 917600 7,406 150 BARNESVILLE 917800 3,567 250 JACKSON 918000 2,385 LINE > 200 # DANVILLE 918400 350 400 EXHIBIT B Page No. 2 of 4 ATLANTA GAS LIGHT COMPANY The legal description of the Delivery Points listed below are more particularly set forth in the Company's Delivery Point catalogs, a copy of which can be requested from Company or accessed through SoNet, Company's electronic computer system. This exhibit reflects Maximum Daily Delivery Quantities for FT Service Agreement No. 904460 and FT-NN Service Agreement No. 904461 Delivery Delivery MDDQ Meter Capability Cont. Point Point in Daily Hourly Press. Description Code MCF (Mcf/d) (Mcf/h) (psig) Notes - ---------------- -------- -------- ------------------ ------ ---------- DEXTER 918600 410 400 EASTMAN/C'WELL 918800 2,500 400 ALAMO 919200 9,601 750 HAZLEHURST 919400 2,035 400 BAXLEY 919600 3,821 600 JESUP 919800 14,255 450 BRUNSWICK 920200 14,605 150 WARRENTON 930600 4,429 325 BLYTHE 931600 160 300 SANDERSVILLE 932500 6,430 200 S'FIELD-GUYTON 934200 850 REG 380#-400# ROME AREA 940013 29,971 A ROME #1 904200 13,300 800 LINE > 450 # ROME #2 904300 20,000 1,100 260 ROME #3 904400 11,000 540 LINE > 400# SHANNON 906200 1,300 70 150 C AUGUSTA AREA 940016 69,381 A AUGUSTA #1 932000 53,140 3,188 400 AUGUSTA #2 932100 35,000 1,500 LINE AUGUSTA #3 932200 18,333 1,100 450 AUGUSTA #4 932300 19,200 800 LINE NEW-YAT-DAL AR 940018 47,162 A VILLA RICA 909400 150 DALLAS #2 909800 888 53 300 YATES JUNCTION 910100 9,152 548 LINE NEWNAN JUNCT'N 910200 8,500 492 LINE DOUGLASVILLE 910400 LINE > 250# CALHOUN AREA 940019 4,552 A CALHOUN #1 907200 9,640 578 190 CALHOUN #2 907300 9,640 402 LINE > 350 # CTOWN-RMART AR 940020 10,321 A EXHIBIT B Page No. 3 of 4 ATLANTA GAS LIGHT COMPANY The legal description of the Delivery Points listed below are more particularly set forth in the Company's Delivery Point catalogs, a copy of which can be requested from Company or accessed through SoNet, Company's electronic computer system. This exhibit reflects Maximum Daily Delivery Quantities for FT Service Agreement No. 904460 and FT-NN Service Agreement No. 904461 Delivery Delivery MDDQ Meter Capability Cont. Point Point in Daily Hourly Press. Description Code MCF (Mcf/d) (Mcf/h) (psig) Notes - ---------------- -------- -------- ------------------ ------ ---------- CEDARTOWN 903600 7,300 430 250 ROCKMART 903800 7,800 470 250 CAR'LLTON AREA 940026 19,209 A BOWDEN 902800 300 BREMEN 903000 300 CARROLLTON 909000 310 TEMPLE 909200 150 GRAND TOTAL 662,034 ATLANTA GAS LIGHT COMPANY SOUTHERN NATURAL GAS COMPANY By: /s/ Stephen J. Gunther By: /s/ Joel Anderson Vice President Date: September 11, 1995 Date: 9-18-95 EXHIBIT B Page No. 4 of 4 ATLANTA GAS LIGHT COMPANY Service Agreement No. 904460 (A) Company's obligation to deliver gas at each measurement station comprising this Delivery Point is limited to the delivery capacity of Company's facilities (at the measurement station and of the up-stream pipelines serving said station) as it exists from time to time. (B) At a delivery pressure of 300 PSIG, the maximum hourly rate will be 12,000 Mcf; and the maximum daily rate 258,470 Mcf. (C) Maximum hourly rate to be 80 Mcf upon the installation of additional meter (after notification by purchaser) when required increased load. (D) In accordance with ordering Paragraph (B) of the Commission's Order issued December 27, 1973, in Docket No CP74-7, combined deliveries through the Macon-Milledgeville No. 1 and No. 2 Meter Stations for any calendar year may not exceed 20,047,991 Mcf.