Airco Cryoplants, Inc.

Algonquin Gas Transmission Co.

Alliance Pipeline L.P.

Alyeska Pipe Line Service Company

A.N.R. Pipeline Company


Arco Pipe Line Company

Arkansas Louisiana Pipe Line Company

Arkla Energy Resources, Inc.

Ashland Pipe Line Company

Boardwalk Pipeline Partners

CenterPoint Energy Gas Transmission

Central Valley Gas Storage

Centurion Pipeline

Chandeleur Pipe Line Company

Cheniere Energy

Chevron Pipe Line Company

Cities Service Oil Company

CMS Energy

Coastal States Gas Corporation

Columbia Pipeline Group

Colonial Pipe Line Company

Columbia Gas Transmission Corporation

Columbia Gulf Transmission Co.

Dixie Pipe Line Company

Dow Chemical Company

Duke Energy Corporation

El Paso Natural Gas Company

Energy Transfer Fuel

Enterprise Products

Explorer Pipe Line Company

Express Pipeline Partnership

Exxon Pipe Line Company

Florida Gas Transmission Company

Great Lakes Gas Transmission Company

Gulf Refining Company

Gulf South Pipeline Company

Intratex Gas Company

Kern River Gas Transmission Company

Kinder Morgan, Inc.

Liberty Gas Storage, LLC

Louisiana Offshore Oil Port

Louisiana Power & Light Company

Louisiana State Gas Corporation


Marathon Pipeline Company


Michigan Consolidated Gas Company

MichiganWisconsin Pipe Line Company

Mobil Pipeline Company

Nato Germany

Natural Gas Pipeline Company of America

NikiskiAlaska Pipeline Company

NiSource Transmission & Storage

NiSource Midstream LLC

Northern Border Pipeline Company

Northwest Pipeline Corporation

Occidental Petroleum Corporation Libya

Pan American Argentina Oil Company Argentina

Pennsylvania Power & Light

Petroleos Mexicanos – Mexico

Fluor Engineering

Phillips Pipe Line Company

Plantation Pipe Line Company

Puget Sound Energy, Inc.

Republic of Turkey Turkey

Rockies Express Pipeline / Entrega

Rotterdam Rijn Pipeline Company – Germany

Seadrift Pipeline Company

Sea Robin Pipe Line Company

Sempra Pipelines & Storage, LLC

Shell Pipe Line Corporation

Southern Natural Gas Co.

Standard Oil of Indiana

Stauffer Chemical Company

TC Energy (TransCanada)

Tennessee Gas Pipeline Company

Texas Eastern Gas Pipeline Company

Texas Gas Transmission Company

Texas Pipeline Company

Texoma Pipeline Co.

TransColorado Gas Transmission Company

Transcontinental Gas Pipe Line Corporation

Trunkline Gas Company

Union Carbide Corporation

United Gas Pipe Line Company

USA Environment, LP

Williams Companies