- Anadarko Petroleum Corporation
- BP America Production Company
- Copano Energy / Rocky Mountains, L.L.C.
- CenterPoint Energy
- CMS Energy
- Devon Energy Production Company, LP
- El Paso Energy Company
- EOG Resources, Inc.
- Kerr-McGee Oil & Gas Onshore, L.P.
- Kinder Morgan, Inc.
- NiSource Inc.
- Noble Energy, Inc.
- Petro-Canada Resources (USA) Inc.
- Rosetta Resources
- Rosewood Resources, Inc.
- SourceGas LLC
- XTO Energy Inc.
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