Alpena Power Company

Associated Electric Power Cooperative, Inc.

Basin Electric Power Cooperative

California Power Exchange

Central Vermont Public Service Corporation

City of Pasadena, California

City of Vicksburg, Mississippi

Dalton Utilities

Dominion Resources, Inc.

• Dominion Energy

• Dominion Virginia Power

Edison Electric Institute

El Paso Electric Company

Integrys Energy Group

• Wisconsin Public Service Corporation

• Upper Peninsula Power Company

• Integrys Energy Services, Inc.

KAMO Electric Power Cooperative

Manitoba Hydro

Mid-Continent Systems Group

National Rural Electric Cooperative Association

NSTAR Electric Company

Otter Tail Corporation

PEPCO Holdings, Inc.

• Atlantic City Electric Company

• Delmarva Power & Light Company

• Potomac Electric Power Company

• Conectiv

• Conectiv Energy Services, Inc.

Port Dolphin Energy LLC

Port Westward LNG, LLC

Progress Energy Services Company

• Progress Energy Carolinas, Inc.

• Progress Energy Florida, Inc.

Regulatory Commission of Alaska

Ropes & Gray/Brooklyn Navy Yard

Sempra Energy

• Bay Gas Storage Company, Ltd.

• Mobile Gas Service Corporation

Sho-Me Power Electric Cooperative

Tokyo Electric Power Company

Tri-State Generation and Transmission Association, Inc.

Vectren Corporation

• Southern Indiana Gas & Electric Company

• Vectren Ohio

Willmut Gas Company