Amendment To Service Agreement #902470

EXHIBIT 10.31


AMENDATORY AGREEMENT


This Amendment is entered into this 1st day of March, 2000, between Southern Natural Gas Company ("Company") and Atlanta Gas Light Company ("Shipper").


WITNESSETH


WHEREAS, Company and Shipper are parties to Firm Transportation Service Agreement(s) (collectively referred to as "Contract FSNG4") for the following Transportation Demands and effective dates under the indicated Rate Schedule(s) of Company's FERC Gas Tariff, Seventh Revised Volume No. 1:


- -------------------------------------------------------------------------------- Original Package Rate Transportation Effective Primary Contract Number Schedule Demand Date Term Number (Mcf/day) - -------------------------------------------------------------------------------- 902470 1 FT 100,000 9/1/1994 8/31/2002 - -------------------------------------------------------------------------------- 904460 2 FT 1,000/1/ 11/1/1994 6/30/2007 - -------------------------------------------------------------------------------- 904460 3 FT 106,905/1/ 11/1/1994 4/30/2007 - -------------------------------------------------------------------------------- 904460 4 FT 21,139 11/1/1994 8/31/2003 - -------------------------------------------------------------------------------- 904460 5 FT 122,768 11/1/1994 8/31/2002 - -------------------------------------------------------------------------------- 904461 4 FT-NN 24,133 11/1/1994 8/31/2003 - -------------------------------------------------------------------------------- 904461 5 FT-NN 382,089 11/1/1994 8/31/2002 - --------------------------------------------------------------------------------


WHEREAS, Company and Shipper are also parties to a Firm Contract Storage Service Agreement (referred to as "Contract SSNG4") for the following Maximum Storage Quantity ("MSQ") and Maximum Daily Withdrawal Quantity ("MDWQ") for the effective dates shown under Rate Schedule CSS of Company's FERC Gas Tariff, Seventh Revised Volume No. 1:


- -------------------------------------------------------------------------------- Original Package MSQ MDWQ Effective Primary Contract Number (Mcf/day) (Mcf/day) Date Term Number - -------------------------------------------------------------------------------- S20150 3 1,195,179 24,133 11/1/1994 8/31/2003 - -------------------------------------------------------------------------------- S20150 4 18,922,495 382,089 11/1/1994 8/31/2002 - --------------------------------------------------------------------------------


_____________ /1/ These Transportation Demands are not subject to pregranted abandonment pursuant to 18 C.F.R. (S) 284.221(d)(3).


WHEREAS, Shipper has chosen to support Company's rate case settlement filed with the Federal Energy Regulatory Commission ("FERC") on March 10, 2000, in Docket Nos. RP99-496-000 and RP99-496-001 ("Settlement") in order to receive the benefit of the lower settlement rates effective March 1, 2000, and the other benefits set forth in the settlement, in exchange for contract extensions of the above-referenced firm contract(s) for the period(s) specified herein;


NOW, THEREFORE, in consideration of the premises and the mutual benefits and convenants contained herein, the parties agree as follows:


1. The primary term(s) set forth in Section 4.1 of each firm Service ...