- Alabama Gas Company
- Algonquin Gas Transmission
- Atlanta Gas & Light Resources
- Atlantic Energy, Inc.
- Baltimore Gas & Electric Company
- Bay State Gas Company - Springfield
- Bay State Gas Company - Brockton
- Berkshire Gas Co.
- Centerpoint Energy
- Citizens Gas
- Clean Energy Fuels
- Columbia Gas of VA
- Columbia Gas Transmission
- Connecticut Natural Gas
- Delta Gulf Corporation
- Dixie Pipeline
- Dominion Transmission Inc.
- Duke Energy
- Eastern Shore Gas
- EcoElectrica
- El Paso Energy Corp.
- Elizabethtown Gas
- Fairbanks Natural Gas
- Fall River Gas Company
- Granite State Gas Transmission Company
- Greenville Utilities
- Holyoke Municipal Gas
- Intermountain Gas
- Iroquois Gas Transmission
- Kokomo Gas & Fuel
- Maritimes & Northeast
- Metropolitan Utilities District
- MidAmerican Energy
- Middleboro Gas & Electric
- National Grid
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- New England Gas Company
- Nstar Corporation
- New Jersey Natural Gas Company
- Northern Natural Gas
- Northern Utilities
- Northwest Natural Gas
- Norwich Department of Public Utilities
- Orange & Rockland
- Paiute Pipeline
- PECO Energy
- Philadelphia Gas Works
- Pine Needle Energy
- Portland Natural Gas Transmission System
- Public Service Electric and Gas
- Puget Sound Energy
- Sea-3, Inc.
- Southern Connecticut Gas Co.
- South Carolina Pipeline
- South Jersey Gas Company
- Southwest Gas
- Spectra Energy
- Suez LNG NA
- Thompson Gas & Electric
- Texas Eastern Pipeline Products (TEPPCO)
- Unitil Corp./ Fitchburg Gas & Electric
- UGI Energy Services, Inc.
- Vermont Gas Systems, Inc.
- Virginia Natural Gas
- Washington Gas Light Company
- Westfield Gas & Electric
- Williams Energy Services
- Wisconsin Public Service Corp.
- Xcel Energy
- Yankee Gas Services Company
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