Alberta Energy Company Ltd., Calgary, Alberta, Canada

American Gas Association, Washington, DC

American Pipeline Company, Houston, Texas

ANR Pipeline Company, Houston, Texas

Aquila Energy Corporation, Omaha, Nebraska

Arizona Public Service - Phoenix, Arizona

Baltimore Gas and Electric Company, Baltimore, Maryland

Bay Gas Storage, Mobile, Alabama

BC Gas, Vancouver, British Columbia, Canada

Blue Dolphin Energy, Houston, Texas

Bowdoin Storage Services, Inc., Boston, Massachusetts

Bridgeline Gas Distribution Company, New Orleans, Louisiana

Caledonia Energy Partners, Flower Mound, Texas

Calpine Corporation, Folsom, California

Canadian Imperial Bank of Commerce, Houston, Texas

Canatxx Ventures, Houston, Texas

Central Illinois Public Service Company, Springfield, Illinois

Chase Manhattan Bank, Houston, Texas.

Cincinnati Gas and Electric Company, Cincinnati, Ohio

City of Austin, Texas

CMS Gas Transmission, Dearborn, Michigan

Coastline Gas Storage Company, Houston, Texas

Cockrell Interests, Inc., Houston, Texas

Conoco, Inc., Houston, Texas

Continental Resources of Illinois, Inc., Mt. Vernon, Illinois

Contact Energy Ltd., Wellington, New Zealand

Corpus Christi Gas Marketing. L.P., Houston, Texas

Crystal Gas Storage, Shreveport, Louisiana

CU Gas Limited, Calgary, Alberta, Canada

Danske Olie & Naturgas AS, Horsholm, Denmark

Dayton Power and Light Company, Dayton, Ohio

Destec Inc., Houston, Texas

Direct Energy Inc., Houston, Texas

Dominion Transmission, Clarksburg, West Virginia

Duke Energy, Houston, Texas

Edmundson Management Co. Inc., New Orleans, Louisiana

El Paso Energy, Houston, Texas

Electric Power Research Institute, Inc., Palo Alto, California

Enbridge Energy Company Inc., Houston, Texas

EnCana Gas Storage, Inc., Calgary, Alberta, Canada

Energy South, Mobile, Alabama

Enermex™, Mexico City, Mexico

Enron Corporation, Houston, Texas

Enstor Inc., Houston, Texas

Entergy Power Marketing, The Woodlands, Texas

Entre Energy Corporation, Houston, Texas

Exxon Corporation, Houston, Texas

Freebird Gas Storage, Houston, Texas

Galway Group LP, Houston, Texas

Gas Research Institute, Chicago, Illinois

Gas Technology Institute, Chicago, Illinois

General Electric Capital Corporation, Stamford, Connecticut

Haynes & Boone, LLP, Dallas, Texas

HNG Storage Company, Houston, Texas

Houston Lighting and Power Company, Houston, Texas

Hunton & Williams, L.L.P., Dallas, Texas

Hutcheson & Grundy, L.L.P., Houston, Texas

HVB Americas, New York, New York

ICG Utilities Limited, Greater Winnipeg Gas Company, Winnipeg, Manitoba

IMC Salt, Overland Park, Kansas

Institute of Gas Technology, Chicago, Illinois

Intragaz, Quebec, Canada

Iroquois Gas Transmission System, Shelton, Connecticut

J. Makowski  & Associates, Boston, Massachusetts

Keogh, Cox  & Wilson Ltd., Baton Rouge, Louisiana

K N Energy, Inc., Colorado Springs, Colorado

Koch Gateway Pipeline Corporation, Houston, Texas

Lemle & Kelleher LLP, New Orleans, Louisiana

Levitan & Associates, Inc., Boston, Massachusetts

Manitoba Hydro, Centra Gas,  Winnipeg, Manitoba, Canada

Marathon Oil Company, Houston, Texas

Martin Resources,  Kilgore, Texas

Matrix Partners, Inc.,  Houston, Texas

McFarland Energy, Inc., Santa Fe Springs, California

MCN Investment Company, Detroit, Michigan

MG Natural Gas Corporation, Houston, Texas

Michigan Consolidated Gas Company, Detroit, Michigan

Mid Louisiana Gas Company, Houston, Texas 

Midwest Gas Storage Company, Chicago, Illinois

Miller, Balis & O'Neal, PC, Washington, DC

Minnegasco Inc., Minneapolis, Minnesota

Montrose & Company, Reno, Nevada

Morton International, Chicago, Illinois

Murphy Oil U.S.A., Inc., El Dorado, Arkansas

Natural Gas Pipeline Company of America, Houston, Texas

Nerco Oil & Gas Company, Vancouver, Washington

NICOR, Inc., Naperville, Illinois

Northern California Gas Storage Company, Carmichael, California

Northern Indiana Fuel and Light Company, Auburn, Indiana

NW Natural Gas, Portland, Oregon

Nova Corporation of Alberta, Calgary, Alberta, Canada

Olson & Olson, Houston, Texas

Pacific Gas & Electric Company, San Francisco, California

PanCanadian Petroleum, Limited, Calgary, Alberta, Canada

Panhandle Eastern Corporation, Houston, Texas 

Peoples Natural Gas Company, Wichita, Kansas

Petro Canada, Calgary, Alberta, Canada

PNP Petroleum, Inc., San Antonio, Texas

Powergen, Coventry, England UK

P.T. Badak NGL Company, Bontang, East Kalimantan, Indonesia

P.T. Pupuk Kalimantan Timur, Bontang, East Kalimantan, Indonesia

Public Service of New Mexico, Albuquerque, New Mexico

Rand-Whitney Group, Inc., Worcester, Massachusetts

Republic Financial Corporation, Denver, Colorado

Richardson Products Co., Fort Worth, Texas

Royal Bank of Scotland, Houston, Texas

Sabine Gas Transmission Company, Houston, Texas 

SaskEnergy Corporation - TransGas Division, Regina, Saskatchewan, Canada

Seagull Pipeline Company, Houston, Texas 

Sempra Energy International, San Diego, California

Shell Oil Company, Houston, Texas 

SK Engineering, Tokyo, Japan 

Smith, Jones & Fawer, L.L.P., New Orleans, Louisiana

Societe Generale, Houston, Texas 

Southern California Gas Company, Los Angeles, California

Sowood Capital Management, Houston, Texas

Sumitomo Metal Industries, Ltd., Tokyo, Japan

Sunset Gas Storage Company, Brentwood, California

TCW Asset Management Company, Houston, Texas 

Tenaska Marketing Ventures, Omaha, Nebraska

Texaco-Sabine Hub Services, Houston, Texas 

Texas Brine, Houston, Texas 

Tex/Con Gas Pipeline Company, Houston, Texas 

The Pace Consultants, Inc., Houston, Texas 

The World Bank, Washington, DC 

Torch Energy Marketing, Inc., Houston, Texas 

Toronto Dominion Bank, New York, New York

TransCanada Pipeline, Calgary, Alberta, Canada

Transcontinental Pipeline Company, Houston, Texas 

TU Electric Company, Dallas, Texas

Union Bank, Los Angeles, California

Union Cities Gas Company, Brentwood, Tennessee

Unocal Corporation, Houston, Texas 

US Generating Company, Bethesda, Maryland

US Magnesium LLC, Salt Lake City, Utah

Ventum Energy, Houston, Texas 

Virginia Gas Company, Abingdon, Virginia

Washington Natural Gas Company, Seattle, Washington

WestLB, New York, New York

Westpark Resources, Houston, Texas

Wisconsin Natural Gas Company, Racine, Wisconsin

Wisconsin Public Service, Green Bay, Wisconsin

Wiser Oil Company, Dallas, Texas