IEHRA PARTICIPATING COMPANIES

AEI Services LLC
AES
AGL Resources / Sequent Energy
Air Products and Chemicals
Airtricity, Inc.
Alabama Electric Cooperative, Inc.
Allegheny Energy, Inc.
Alstom Inc.
Ameren Corporation
American Electric Power
American National Power, Inc.
American Ref-Fuel
Aquila
Arkansas Electric Cooperative Cooperation
Associated Electric Cooperative, Inc
BG Group North America
Black Hills Corporation
Browning-Ferris Gas Services, Inc.
Caithness Corporation
CalEnergy Generation
Calpine Corporation
Centennial Energy Resources,
Central Hudson Gas&Elec Corp.
Chevron Global Power Generation
Cinergy Corp
City of Austin
City Public Service of San Antonio
CLECO Corp.
CMS Energy Corp.
CMS Generations Co.
Cogentrix Energy, Inc.
Colmac Energy, Inc.
Colorado Energy Management, LLC
Conoco Gas and Power
Constellation Commodities Group
Constellation Power Generation
Coso Operating Company LLC
Covanta Energy Corporation
CPS Energy
Deseret G&T
Dominion Resources, Inc.
DTE Energy Services
Duke Energy Americas
Duke Energy Corporation
Dynegy Inc.
Edison Mission Energy
El Paso Corp
Enel North America, Inc.
Enpower Corp
Enron Wind Corp
Entegra Power
Group LLC
enXco
EON U.S., LLC
EPCOR OPERATION (US) INC.
ERCOT
Exelon Corporation

FirstEnergy Corp.
Fletcher Challenge Utilities
Florida Municipal Power Agency
Florida Power & Light
Fortis Energy Mkt & Trading
Foster Wheeler Power Systems
FPL Energy LLC
Frederickson Power LP.
Gas Recovery Systems
Globeleq Inc.
Golden Valley Electric Association, Inc.
GWF Power Systems
Idaho Power Company
Indianapolis Power & Light
Integrys Energy Services, Inc.
IPA Operating Company - Milford
Kansas City Power & Light
Kinder Morgan, Inc.
LG&E Energy LLC
Lower Colorado River Authority
Marathon Oil Company
Mid American Energy Holdings
Midland Cogeneration Venture
Midwest Generation EME, LLC
Midwest ISO
Minnesota Methane LLC
Mirant Corporation
Mississippi Power Company
Montana-Dakota Utilities Co.
Nebraska Public Power District
New York Power Authority
North American Energy Services
Northern CA Power Agency
Northern Star Generation Services Company LLC
NRG Energy Inc
OG&E Energy Corp
Oklahoma Gas & Electric
Old Dominion Electric Coop
PacifiCorp
Peoples Energy
Pepco Energy Service, Inc.
PG&E National Energy Group
Portland General Electric Co
Potomac Holdings, Inc.
PPL Corp
PPL Montana, UC
PPM Energy, Inc
Primesouth, Inc.
Progress Energy Ventures
PSEG Services Corp.
Public Service Enterprise Group, Public Utility Dist 1 of Chelan Co
Puget Sound Energy
Quixx Corporation
Reliant Energy, Inc.
Rosebud Operating Services, Inc.
SCANA Corporation
Seminole Electric Cooperative
Sempra Global
Siemens Power Generation, Inc