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Diversified Utilities

• Allete, Inc.
• Alliant Energy Corporation
• Ameren Corporation
• Aquila Inc.
• Avista Corporation
• CenterPoint Energy, Inc (Holding Co)
• CH Energy Group, Inc.
• CMS Energy Corporation
• Commerce Energy Group Inc.
• Consolidated Edison, Inc.
• DPL Inc.
• Energy East Corporation
• Essential Innovations Technolo
• Exelon Corporation
• Florida Public Utilities Company
• Integrys Energy Group, Inc.
• Marmion Industries Corp.
• MGE Energy Inc.
• Mirant Corp.
• Northeast Utilities
• Northern Indiana Public Service Company
• NorthWestern Corporation
• Pacific Gas & Electric Co.
• PNM Resources, Inc. (Holding Co.)
• Public Service Enterprise Group Incorporated
• SCANA Corporation
• Sierra Pacific Resources
• SUEZ ADS
• UGI Corporation
• United Utilities plc.
• UNITIL Corporation
• US Geothermal Inc.
• Vectren Corporation
• Westar Energy, Inc.
• Wisconsin Energy Corporation

Electric Utilities

• Active Power, Inc.
• AES Corp.
• Allegheny Energy, Inc.
• Alliance Recovery Corp.
• AMEN Properties, Inc.
• American Electric Power Company, Inc.
• Beacon Power Corporation
• Black Hills Corporation
• Central Vermont Public Service
• Cleco Power LLC
• Companhia Paranaense de Energia (COPEL)
• Constellation Energy Group, Inc.
• Dominion Resources, Inc.
• DTE Energy Company
• Duke Energy Corporation
• Dynegy Inc.
• E.ON AG
• Ecotality, Inc.
• Edison International
• El Paso Electric Company
• Empire District Electric Company (The)
• Entergy Corporation
• Environmental Power Corporation
• Evergreen Energy, Inc.
• First National Power Corp.
• FirstEnergy Corporation
• FPL Group, Inc.
• Great Plains Energy Inc.
• Hawaiian Electric Industries, Inc.
• IdaCorp, Inc.
• ITC Holdings Corp.
• Maine & Maritimes Corporation
• Mass Megawatts Wind Power Inc.
• Microfield Group Inc.
• MMC Energy, Inc.
• Nathaniel Energy Corp.
• NRG Energy, Inc.
• NSTAR
• OGE Energy Corporation
• Ormat Technologies, Inc.
• Otter Tail Corporation
• Pinnacle West Capital Corporation
• Portland General Electric Co.
• Potomac Electric Power Company
• PPL Corporation
• Progress Energy Inc.
• Puget Sound Energy
• Reliant Resources, Inc.
• Renewable Energy Resources, In
• Southern Company (The)
• TECO Energy, Inc.
• TransAlta Corporation
• TXU Corporation
• U.S. Energy Systems, Inc.
• UIL Holdings Corporation
• UniSource Energy Corporation
• Xcel Energy Inc.

Foreign Utilities

• Companhia de saneamento Basico Do Estado De Sao Paulo - Sabesp
• Consolidated Water Co. Ltd.
• CPFL Energia S.A.
• Empresa Nacional de Electricidad S.A.
• Endesa S.A.
• ENEL S.p.A.
• Enersis S.A.
• Huaneng Power International In
• International Power plc
• Korea Electric Power Corporation
• MetroGas, S.A.
• Transportadora de Gas del Sur SA TGS
• Vivendi Environnement Ord

Gas Utilities

• AGL Resources, Inc.
• Atmos Energy Corporation
• Cascade Natural Gas Corporation
• Chesapeake Utilities Corporation
• Corning Natural Gas Corp.
• Delta Natural Gas Company, Inc.
• Energen Corporation
• Energy West, Inc.
• EnergySouth, Inc.
• Equitable Resources, Inc.
• KeySpan Corporation
• Laclede Group, Inc.
• National Fuel Gas Company
• National Grid Transco, PLC
• NewJersey Resources Corporation
• Nicor Inc.
• Northwest Natural Gas Company
• ONEOK, Inc.
• Piedmont Natural Gas Company, Inc.
• RGC Resources Inc.
• SEMCO Energy, Inc.
• Sempra Energy
• Sino Gas International Holding
• South Jersey Industries, Inc.
• Southern Union Company
• Southwest Gas Corporation
• Transcananda Pipelines, Ltd.
• Washington Gas Light Company

Water Utilities

• American States Water Company
• Aqua America, Inc.
• Artesian Resources Corporation
• Basin Water, Inc.
• BIW Limited
• California Water Service Group Holding
• Connecticut Water Service, Inc.
• Middlesex Water Company
• Pennichuck Corporation
• SJW Corporation
• Southwest Water Company
• York Water Company (The)