http://www.ngtgroup.com/businesses/mn_ngusa.html From below:
National Grid operates high-voltage direct current transmission lines and alternating current/direct current terminals for the Hydro-Quebec and New England transmission interconnection.
National Grid USA is one of the ten largest electric utilities (by customers) in the US. Its electricity delivery network includes 12,000 miles of transmission lines and 72,000 miles of distribution lines. National Grid has the largest transmission and distribution network in the New York/New England region.
Electricity distribution
National Grid has five US electricity distribution companies that serve approximately 3.2 million customers in the states of New York, Massachusetts, Rhode Island and New Hampshire:
* Niagara Mohawk serves more than 1.5 million customers in 669 communities in upstate New York
* Massachusetts Electric serves approximately 1.2 million customers in 168 Massachusetts communities
* Narragansett Electric serves approximately 465,000 customers in 38 Rhode Island communities
* Granite State Electric serves more than 38,000 customers in 21 New Hampshire communities
* Nantucket Electric serves more than 10,000 customers on the island community of Nantucket, 30 miles off the coast of Cape Cod, Massachusetts
Natural gas distribution
Niagara Mohawk Power Corporation delivers natural gas to more than 540,000 customers in 197 communities in upstate New York.
Electricity transmission
National Grid Transmission USA represents the combined electricity transmission interests of the National Grid USA subsidiaries, including those listed below:
* Niagara Mohawk Power Corporation owns and operates approximately 9,000 miles of transmission lines and other transmission facilities in upstate New York
* New England Power Company owns and/or operates approximately 3,000 miles of transmission lines and other transmission facilities in Massachusetts, Hampshire, Rhode Island and Vermont
* National Grid Transmission Services Corporation provides consulting, engineering, and operations support services to transmission customers
Interconnectors
National Grid operates high-voltage direct current transmission lines and alternating current/direct current terminals for the Hydro-Quebec and New England transmission interconnection.
National Grid USA
25 Research Drive
Westborough
Massachusetts 01582
USA
Telephone: +1 (508) 389 2000
Facsimile: +1 (508) 389 2605