Bethesda, MD

Usosc Holdings, Inc.

U.S. Operating Services Holdings, Inc.

Toyan Enterprises Corporation

Heron Power Corporation

Okeechobee Power Corporation

Usgen Holdings, Inc.

Pelican Power Corporation

Negt Energy Trading Holdings Corporation

Bluebonnet Generating Company, LLC

Germantown, MD

Wellhead Power Corporation

National Energy Generating Holdings, Inc.

Dispersed Generating Company, LLC

Usg Services, L.L.C.

Washington, DC

Rockville, MD

White Energy Coal North America, Inc.

Narberth, PA

Narberth Theatre Inc

Competitive Power Ventures, Inc.

Rockville, MD

Xgen Tax & Accounting LLC