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It is the largest distributor of natural gas in northeastern U.S., serving more than 3 million customers in New York, Massachusetts and Rhode Island. Follow us on Twitter, watch us on Youtube,...

The business serves over twenty million customers in Massachusetts, Rhode Island, and New York State and is headquartered in Waltham, Massachusetts in a 300,000-square-foot (28,000 m 2) LEED certified "green" facility. This subsidiary carries out its business through a number of subsidiary companies (all doing business as "National Grid").

In Massachusetts, eleven Program Administrators, including NSTAR, National Grid, Western Massachusetts Electric, Cape Light Compact, Until, and Berkshire Gas, jointly own the rights to this program, in conjunction with the MA Department of Energy Resources (DOER) and the Energy Efficiency Advisory Council (EEAC).

Massachusetts – Berkshire Gas, Blackstone Gas Company, Colonial Gas, Columbia Gas of Massachusetts, Eversource Energy, Holyoke Gas and Electric, Liberty Utilities, Middleboro Municipal Gas and Electric Department, National Grid, Unitil Corporation, Wakefield Municipal Gas and Light Department, Westfield Gas and Electric Department