- Alabama Gas Company
- Algonquin Gas Transmission
- Atlantic Energy, Inc.
- Baltimore Gas & Electric Company
- Bay State Gas Company - Springfield
- Bay State Gas Company - Brockton
- Berkshire Gas Co.
- Boston Gas Company
- Columbia Gas of VA
- Commonwealth Gas Company
- Connecticut Natural Gas
- Delta Gulf Corporation
- Distrigas of Massachusetts/Tractebel LNG
- Dominion Transmission Inc.
- Duke Energy
- Eastern Shore Gas
- EcoElectrica
- El Paso Energy Corp.
- Elizabethtown Gas
- Fall River Gas Company
- Granite State Gas Transmission Company
- Greenville Utilities
- Holyoke Municipal Gas
- Iroquois Gas Transmission
- Keyspan Energy Delivery
- Maritimes & Northeast
- Metropolitan Utilities District
- Middleboro Gas & Electric
- Northern States Power Company
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- New England Gas Company
- Nstar Corporation
- New Jersey Natural Gas Company
- Northern Natural Gas
- Northern Utilities
- Norwich Department of Public Utilities
- PECO Energy
- Philadelphia Gas Works
- Portland Natural Gas Transmission System
- Providence Energy
- Corporation
- PSEG
- Puget Sound Energy
- Sea-3, Inc.
- Southern Connecticut Gas Co.
- South Carolina Pipeline
- South Jersey Gas Company
- Thompson Gas & Electric
- Texas Eastern Pipeline Products (TEPPCO)
- Unitil Corp./ Fitchburg Gas & Electric
- UGI Energy Services, Inc.
- Valley Gas Company
- Vermont Gas Systems, Inc.
- Virginia Natural Gas
- Washington Gas Light Company
- Westfield Gas & Electric
- Williams Energy Services
- Wisconsin Public Service Corp.
- Yankee Gas Services Company
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