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AGL Resources, Inc.
Air Liquide America Corporation
Air Products & Chemicals, Inc.
Alcorn Exploration, Inc.
Allegheny Power
Alliant Energy
Amerada Hess Corporation
Ameren
American Meter Company
AMVEST Oil & Gas, Inc.
APGA Research Foundation*
Aquila Inc.
Arkansas Oklahoma Gas Corporation
Arkansas Western Gas Company
Atmos Energy Corporation*
Austell Gas System
Avista Corp.
Belden & Blake Corporation
Black Hills Corporation
BP Amoco Exploration & Production Sector
Burlington Resources Inc.
California Energy Commission*
Cascade Natural Gas Corporation
CB&I
Center Point Energy
Central Hudson Gas & Electric Corporation
Chandler & Associates, Inc.
Chesapeake Operating, Inc.
Chesapeake Utilities Corporation
Chevron Texaco North American Upstream
Citizens Utilities Company
City Gas Company
City of Mesa
City Utilities of Springfield
Clearwater Gas System
Colorado Springs Utilities
Conectiv
Connecticut Natural Gas Corporation
ConocoPhillips
Consolidated Edison Company of New York, Inc.*
Consumers Energy
Corning Natural Gas Corporation
CPS Energy*
Dallas Production Inc.
Dayton Power and Light Company
Delta Natural Gas Company, Inc.
Devon Energy Corporation
Distrigas of Massachusetts Corporation
Dominion
Dominion Transmission, Inc.
DTE Energy Gas*
Duke Energy Corporation
El Paso Corporation
Enbridge Gas Distribution, Inc.
Energen Corporation*
Energy Corporation of America
Energy West Incorporated
Entergy Corporation
EOG Resources, Inc
Equitable Resources, Inc.
ExxonMobil Pipeline Company
Fina Oil and Chemical Company
Fitchburg Gas and Electric Light Company
Florence Utilities
Florida Public Utilities Company
Forest Oil Corporation
Freedom Resources Company
Great Lakes Gas Transmission Company
Heath Consultants, Inc.
HNG Storage L.P.
Houston Pipe Line Company
Illinois Gas Company
Intermountain Gas Company
Iroquois Gas Transmission System, L.P.
J.M. Huber Corporation
KCS Resources
Kentucky West Virginia Gas Company
Kerr-McGee Corporation
KeySpan Corporation*
Kinder Morgan, Inc.
Laclede Gas Company
Louisville Gas and Electric Company
Madison Gas and Electric Company
Maxus Energy Corporation
MDU Resources Group, Inc.
Memphis Light, Gas and Water Division*
MidAmerican Energy Company*

Middle Tennessee Natural Gas Utility District
Midwest Energy, Inc.
Mobile Gas Service Corporation
Municipal Gas Authority of Georgia
Nashville Gas Company
National Fuel Gas Company*
New England Gas Company
New Jersey Natural Gas*
New York State Electric & Gas and Rochester Electric & Gas*
New York State Energy Research and Development Authority
Newfield Exploration
Niagara Mohawk, A National Grid Company
Nicor Gas*
Noble Energy, Inc.
Northeast Gas Markets, Inc.
Northern Indiana Public Service Company*
Northern Natural Gas Company
NorthStar Industries, Inc.
NorthWestern Energy
NStar Gas Company
NW Natural
Occidental Oil and Gas Corporation
Ohio Gas Company
Okaloosa Gas District
ONEOK Inc.*
Orange and Rockland Utilities, Inc.
Paiute Pipeline Company
Pacific Gas and Electric Company
Panhandle Energy Company
PECO Energy Company, An Exelon Company
Peerless Mfg. Co.
Penn Virginia Oil & Gas Corporation
Peoples Energy Corporation*
Piedmont Natural Gas Company, Inc.*
Pioneer Natural Resources, USA, Inc.
Pitts Energy Group
PNM Gas Services*
Polaris Corporation
PPL Utilities
PSNC Energy, Gastonia, NC
Public Service Electric and
Gas Company
Puget Sound Energy, Inc.
Questar Corporation*
RGC Resources, Inc.
River Gas Corporation
SaskEnergy
SCANA Corporation
SEMCO Energy Gas Company
Sempra Energy Utilities*
Shell Oil Company
Sierra Pacific Resources
South Carolina Electric & Gas Company
South Georgia Natural Gas Company
South Jersey Gas Company
The Southeast Alabama Gas District
Southern Cross Corp.
Southern Union Company
Southwest Gas Corporation
Stone & Webster Consultants, Inc.
Superior Water, Light & Power Company
Swift Energy Company
T.D. Williamson, Inc
TECO Peoples Gas*
The Gas Company
TransCanada PipeLines Limited
TransCanada Transmission
Tuscarora Gas Transmission Company
TXU Business Services
UGI Utilities, Inc.*
Union Oil & Gas, Inc.
Union Pacific Resources Company
Unocal Corporation
Vectren Corporation
Vermont Gas Systems, Inc.
Viking Gas Transmission Company
Ward Petroleum Corporation
Washington Gas*
We Energies*
Williams Gas Pipeline
Willmut Gas Company
Wisconsin Public Service Corporation
Xcel Energy
Yankee Gas Services Company