Allegheny Energy Supply Company, LLC

Ameren Energy

American Electric Power Service Corporation, as agent for the Operating Companies of American Electric Power Company, Inc. consisting of Appalachian Power Company, Central Power & Light Company, Columbus Southern Power Company, Indiana Michigan Power Company, Kentucky Power Company, Ohio Power Company, Public Service Company of Oklahoma, Southwestern Electric Power Company and West Texas Utilities Company.

Aquila Merchant Services, Inc.

Carolina Power & Light Company

Cinergy Services, Inc. on behalf of the Cinergy Operating Companies

Constellation Power Source, Inc.

Coral Power, L.L.C.

The Detroit Edison Company

DTE Energy Trading

Duke Energy Trading and Marketing, L.L.C.

Dynegy Power Marketing, Inc.

Edison Mission Marketing and Trading

El Paso Merchant Energy, L.P.

EnergyUSA-TPC Corp.

Engage Energy America LLC

Entergy-Koch Trading, LP

Exelon Generation Company, LLC

Florida Power Corporation

H.Q. Energy Services (U.S.) Inc.

MidAmerican Energy Company

MIECO, Inc.

Mirant Americas Energy Marketing, LP

Morgan Stanley Capital Group Inc.

Northern Indiana Public Service Company

Progress Ventures, Inc.

Reliant Energy Services, Inc.

Sempra Energy Trading Corp.

Tenaska Power Services Co.

Tractebel Energy Marketing, Inc.

TransAlta Energy Marketing U.S. Inc