AGL Resources Inc.
Alliance Pipeline Ltd.
Alliant Energy
Amerada Hess
Ameresco, Inc.
American Electric Power
Aquila, Inc.
BG Group
BP America Inc
Bruce Power
Cabot Oil & Gas, Corp.
Caithness Corporation
Calpine Corporation
Canadian Natural Resources Limited
Cargill Power & Gas Marketing
Central Electric Power Cooperative
ChevronTexaco Corporation
Cinergy Services, Inc .
Conoco Phillips
Contango Oil & Gas Company
Coral Energy Holding, L.P.
Covanta Energy Group Corp
Direct Energy Marketing Limited
Dominion Resources
DTE Energy Services, Inc.
Duke Energy
Edison Electric Institute
El Paso Corporation
Energen Corporation
ENSCO International Incorporated
Exelon Business Services Company
Exxon Mobil Corporation
Global Companies, LLC
Halliburton Company
Houston Exploration Company
Husky Energy
Kelda Group
Kern River Gas Transmission Company
KeySpan Corporation
Kinder Morgan Inc.
Koch Industries
LG&E Energy Services, Incorporated and Affiliates
Luk Oil Overseas Ltd
Marathon Oil Company
MidAmerican Energy Holdings Company
National Grid Transco PLC
National Rural Utilities Cooperative Finance Corporation
Natural Gas Partners
Nevada Power Company
Nexen Inc.
Noble Energy, Inc.
North Carolina Electric Membership Corporation
Northeast Utilities Service Company
Northwest Natural Gas
Occidental Oil & Gas Corporation
Ocean Energy, Inc.
PacifiCorp
PanCanadian Petroleum Ltd
Petro-Canada
PG&E Corporation
Phoenix Natural Gas
Pluspetrol S.A.
Portland General Electric
Precision Drilling Corporation
Premier Oil plc
PrimeWest Energy Trust
Public Service Enterprise Group Incorporated
Qatar Gas
Qatar Petroleum
Rockwell Automation
Ruhrgas AG
Samedan Oil Corporation
Samson Investment Company
SaskPower Inc
Sempra Energy
Severn Trent Water International Ltd
Shell Oil Company
Southern California Gas Co.
Southern Company
Suncor Energy Inc.
Swift Energy Company
Talisman Energy Inc.
Targa Resources Inc.
The Tokyo Electric Power Company, Inc.
TransAlta Corporation
Transocean Offshore Deepwater Drilling, Inc.
Transworld Oil U.S.A., Inc..
United Utilities
Unocal
Valero Corporate Services Company
Vermilion Resources Ltd.
Western Gas Resources, Inc.
World Fuel Services Corporation
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