• Boston Gas Co
• El Paso Cgp Co LLC
• Commonwealth Gas Co
• Cordillera Corp
• El Paso Co
• El Paso Natural Gas Co LLC
• Elizabethtown Gas Co
• Gateway Energy Corp/Ne
• Hadson Corp
• Anr Pipeline Co
• Gas Transmission Northwest Corp
• Panhandle Eastern Pipe Line Company, LP
• Peoples Gas Light & Coke Co
• Southeastern Michigan Gas Co
• Southern California Gas Co
• Southern Natural Gas Company, L.L.C.
• Sonat Inc
• Tejas Gas Corp
• Tennessee Gas Pipeline Company, L.L.C.
• Texas Eastern Transmission LP
• Texas Gas Transmission LLC
• Transcanada Pipelines Ltd
• Transco Energy Co
• Transcontinental Gas Pipe Line Company, LLC
• Transok Inc
• Washington Natural Gas Co
• The Williams Companies Inc.
• Wisconsin Gas LLC
• Wisconsin Natural Gas Co
• Northwest Pipeline LLC
• North Shore Gas Co
• Northern Illinois Gas Co
• Colorado Interstate Gas Company, L.L.C.
• Southern Union Co
• Panenergy Corp
• Cornerstone Natural Gas Inc
• Crystal Gas Storage Inc
• Kelley Oil Corp
• Questar Pipeline Co
• Western Gas Processors Ltd
• Eastex Energy Inc
• El Paso Tennessee Pipeline Co LLC
• Transco PLC
• Associated Natural Gas Corp
• Bbj Environmental Technologies Inc
• Kinder Morgan Energy Partners L P
• Gulfterra Energy Partners L P
• ONEOK Partners LP
• Aquila Gas Pipeline Corp
• Contour Energy Co

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