California- Pacific Gas & Electric (PG&E)
- San Diego Gas & Electric (SDG&E)
- Southern California Gas (SoCalGas)
Connecticut- Connecticut Natural Gas (CNG)
- Eversource (Formerly CL&P)
- Eversource (Formerly Yankee Gas)
- Southern Connecticut Gas (SCG)
- United Illuminating (UI)
DelawareDistrict of Columbia- Potomac Edison Power Company (PEPCO)
- Washington Gas Light (WGL)
Florida- Central Florida Gas (CFG)
- Florida City Gas (FCG)
- Florida Public Utilities (FPU)
- Peoples Gas / TECO Gas
Georgia Illinois - Ameren Utilities
- Commonwealth Edison (ComEd)
- MidAmerican Energy
- NICOR
- North Shore Gas
- Peoples Gas
Indiana- Citizens Gas
- NIPSCO
- Vectren Energy Delivery
Maine - Bangor Gas Company
- Central Maine Power (CMP)
- Emera Main (Bangor Hydro)
- Maine Natural Gas
- Unitil
Maryland - Baltimore Gas & Electric (BG&E)
- Chesapeak Utilities
- Columbia Gas of Maryland
- Delmarva Power
- Potomac Edison Power Company (PEPCO)
- Potomac Edison
- Southern Maryland Electric Co-Op (SMECO)
- Washington Gas Light (WGL)
Massachusetts- Berkshire Gas
- Columbia Gas of Massachusetts
- Liberty Utilities (Formerly New England Natural Gas)
- National Grid Massachusetts
- Eversource (Formerly NSTAR)
- Eversource (Formerly WMECO)
- Unitil (Formerly Fitchburg Gas & Electric)
| Michigan - Consumers Energy
- Mich-Con DTE
- Michigan Gas Utilities
- SEMCO Energy
New Hampshire - Eversource (Formerly PSNH)
- Liberty Utilities (Formerly Granite State)
- Unitil
New Jersey- Atlantic City Electric
- Elizabethtown Gas
- Jersey Central Power & Light (JCPL)
- New Jersey Natural Gas (NJNG)
- Public Service Gas & Electric (PSE&G)
- Rockland Electric
- South Jersey Gas
New York- Central Hudson Gas & Electric
- Consolidated Edison (ConEd)
- National Fuel Gas
- National Grid
- New York State Electric & Gas (NYSEG)
- Orange & Rockland (O&R)
- Rochester Gas & Electric (RG&E)
Ohio- AEP Ohio
- Cleveland Electric Illuminating (CEI)
- Columbia Gas of Ohio
- Dayton Power & Light (DP&L)
- Dominion East Ohio
- Duke Energy Ohio
- Ohio Edison (OE)
- Toledo Edison (TE)
- Vectren Energy Delivery
Pennsylvania- Columbia Gas of Pennsylvania
- Duquesne Power
- Metropolitan Edison
- National Fuel Gas
- Pennsylvania Electric Company (Penelec)
- Penn Power
- Peoples Gas
- Philadelphia Electric Co. (PECO)
- Philadelphia Gas Works (PGW)
- PPL Electric (PPL)
- UGI Central Penn
- UGI Penn Natural Gas
- UGI Utilities
- West Penn Power
Rhode Island Texas- Atmos Energy
- AEP Texas Central
- AEP Texas North
- Centerpoint Energy
- Oncor
- Sharyland
- Texas-New Mexico Power (TNMP)
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