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Utilities
AES Corporation
Aggreko Plc
Allegheny Energy, Inc.
Ameren Corporation
American Electric Power Company, Inc.
American States Water Company
American Water Works Company, Inc.
Aquila, Inc.
Associated Natural Gas Corporation
Atlanta Gas Light Company
Atmos Energy Corporation
Avista Corporation
Baltimore Gas and Electric Company
Bay State Gas Company
Bayernwerk AG
Bewag AG
Big Rivers Electric Corporation
Black Hills Corporation
Bonneville Power Administration
Boston Edison Company
Bouygues S.A.
British Energy Plc
CMS Energy Corporation
California Water Service Group
Calpine Corporation
Canadian Utilities Limited
Cap Rock Energy Corporation
Carolina Power & Light Company
Cascade Natural Gas Corporation
Central Vermont Public Service Corporation
Centrica plc
Chesapeake Utilities Corporation
Chubu Electric Power Company, Inc.
Chugoku Electric Power Company Inc.
Cleco Corporation
Cogentrix Energy, Inc.
Commonwealth Energy System
Companhia Energética de Minas Gerais S.A. CEMIG
Connecticut Light and Power Co.
Consolidated Edison, Inc.
Consolidated Natural Gas Company
Consumers Power Co.
Consumers Water Company
Covanta Energy Corporation
DTE Energy Company
Dalkia Holding
Destec Energy, Inc.
Dominion Resources, Inc.
Duke Energy Corporation
E.On AG
ENDESA S.A.
EPCOR Utilities Inc.
Edison International
El Paso Electric Company
El Paso Natural Gas Company
Electrabel N.V.
Electricidade de Portugal, S.A.
Electricity Generating Authority of Thailand (EGAT)
Electricité de France
Enbridge Inc.
Enersis S.A.
Enron Corporation
Entergy Corporation
Environmental Power Corporation
Equitable Resources, Inc.
Exelon Corporation
FPL Group, Inc.
Florida Progress Corporation
Florida Public Utilities Company
Fortis, Inc.
Fortum Corporation
GPU, Inc.
Gas Natural SDG S.A.
Gaz de France
Great Plains Energy Incorporated
Hawaiian Electric Industries, Inc.
Hokkaido Electric Power Company Inc. (HEPCO)
Hong Kong and China Gas Company Ltd.
Hongkong Electric Holdings Ltd.
Hyder plc
Hydro-Quebec
ITC Holdings Corp.
Iberdrola, S.A.
Idaho Power Company
Illinois Bell Telephone Company
Indiana Energy, Inc.
International Power PLC
KU Energy Corporation
Kelda Group plc
Kenetech Corporation
KeySpan Energy Co.
Korea Electric Power Corporation (Kepco)
LG&E Energy Corporation
MDU Resources Group, Inc.
Madison Gas and Electric Company
Magma Power Company
Maine & Maritimes Corporation
Manila Electric Company (Meralco)
Middlesex Water Company
Minnesota Power, Inc.
Montana Power Company
NRG Energy, Inc.
National Grid USA
National Power PLC
Nebraska Public Power District
Nevada Power Company
New Jersey Resources Corporation
Neyveli Lignite Corporation Ltd.
Niagara Mohawk Holdings Inc.
North West Water Group plc
NorthWestern Corporation
Northeast Utilities
Northern States Power Company
Northwest Natural Gas Company
Ontario Hydro Services Company
Osaka Gas Company, Ltd.
Otter Tail Power Company
PECO Energy Company
PG&E Corporation
PNM Resources Inc.
PPL Corporation
PacifiCorp
Pennon Group Plc
Philadelphia Suburban Corporation
Piedmont Natural Gas Company, Inc.
Pinnacle West Capital Corporation
Power-One, Inc.
PowerGen PLC
Powergen PLC
Public Service Company of New Hampshire
Public Service Enterprise Group Inc.
Puerto Rico Electric Power Authority
Puget Sound Energy Inc.
Questar Corporation
RAO Unified Energy System of Russia
RWE AG
Reliant Energy Inc.
Ruhrgas AG
SCANA Corporation
SEMCO Energy, Inc.
SJW Corporation
Salt River Project
Scarborough Public Utilities Commission
Scottish Hydro-Electric PLC
Scottish and Southern Energy plc
ScottishPower plc
Seattle City Light
Sempra Energy
Severn Trent PLC
Shikoku Electric Power Company, Inc.
South Jersey Industries, Inc.
Southern Electric PLC
Southern Indiana Gas and Electric Company
Southern Union Company
Southwest Gas Corporation
Southwest Water Company
Southwestern Electric Power Co.
Suez Lyonnaise des Eaux
TenneT B.V.
Tennessee Valley Authority
Texas Utilities Company
Thames Water plc
The Coastal Corporation
The Columbia Gas System, Inc.
The Empire District Electric Company
The Kansai Electric Power Company, Inc.
The Montana Power Company
The Southern Company
The United Illuminating Company
Tokyo Gas Co., Ltd.
Trigen Energy Corporation
UGI Corporation
Unicom Corporation
United Utilities PLC
United Water Resources, Inc.
Unitil Corporation
Utah Power and Light Company
VEW AG
Vattenfall AB
Viridian Group plc
WPS Resources Corporation
Warwick Valley Telephone Company
Washington Gas Light Company
Washington Natural Gas Company
Westar Energy, Inc.
Western Resources, Inc.
Wisconsin Energy Corporation
Wisconsin Public Service Corporation
Xcel Energy Inc.