Alpena Power Company

Associated Electric Power Cooperative, Inc.

Basin Electric Power Cooperative

Central Vermont Public Service Corporation

City of Pasadena, California

City of Vicksburg, Mississippi

Dalton Utilities

Dominion Resources, Inc.

• Dominion Energy

• Dominion Virginia Power

East River Electric Cooperative

Edison Electric Institute

El Paso Electric Company

Green Mountain Power Company

Integrys Energy Group

• Wisconsin Public Service Corporation

• Upper Peninsula Power Company

• Integrys Energy Services, Inc.

Intermountain Rural Electric Association

J-POWER USA Development, Ltd.

KAMO Electric Power Cooperative

Manitoba Hydro

National Rural Electric Cooperative Association

Northeast Missouri Power Electric Cooperative

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.

Ropes & Gray/Brooklyn Navy Yard

Sempra Energy

• Bay Gas Storage Company, Ltd.

• Mobile Gas Service Corporation

Sho-Me Power Electric Cooperative

Snohomish County Public Utility District No. 1

Tri-State Generation and Transmission Association, Inc.

Vectren Corporation

• Southern Indiana Gas & Electric Company

• Vectren Ohio

Vermont Electric Power Company, Inc.

Willmut Gas Company