- Bay State Gas Company d/b/a Columbia Gas of Massachusetts
- Berkshire Gas Company
- Blackstone Gas Company
- Boston Gas Company d/b/a National Grid
- Colonial Gas Company d/b/a National Grid
- Fitchburg Gas and Electric Light Company d/b/a Unitil
- Liberty Utilities (New England Natural Gas Company) Corp. d/b/a Liberty Utilities
- NSTAR Gas Company
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