National Grid - Transmission
National Grid
Transmission Electricity Transmission: National Grid owns and operates an electricity transmission system of approximately 8,600 miles spanning upstate New York, Massachusetts, Rhode Island, New Hampshire and Vermont to customers that include local electric companies, municipalities and large commercial enterprises. Our US electricity transmission facilities operate at voltages ranging from 69 kV to 345 kV, utilizing overhead lines, nearly 90 miles of underground cable and 524 substations. We are the largest electricity transmission service provider in New England and New York by reference to the length of these high voltage transmission lines.

Canadian interconnector: National Grid owns and operates a direct current transmission line rated at 450 kV that is a key section of an interconnector between New England and Canada.

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Northeast Operations
This section contains helpful information for new and existing transmission customers and general information about our Northeast operations, the heart of our U.S. transmission activities.

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Southern Rhode Island Transmission Project
Meeting growing demand and ensuring continued reliable electric service to our customers.

Proposed Projects Transmisson Line Improvements
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Substations Public Outreach and Schedule
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Project Maps RI PUC Filings Documents and Reports

Spier Falls to Rotterdam Project
This project is critically important to the delivery of safe, reliable power to the region surrounding Saratoga Springs and north, as electric needs have increased over the years. This project includes a new, 115 kV transmission line to run 33 miles from National Grid’s Rotterdam substation to its Spier Falls substation, in addition to a 4.2 mile line in the Town of Ballston. The new lines will provide additional reliability and service to approximately 45,000 commercial and residential customers.

AuburnTransmission Project
New York State Public Service Commission Case 13-T-0235

In May 2013, NYSEG and Niagara Mohawk Power Corporation (d/b/a National Grid) filed a joint application with the New York State Public Service Commission for a Certificate of Environmental Compatibility and Public Need under Article VII of Public Service Law for the Auburn Transmission Project. In November 2013, NYSEG and National Grid filed a supplement to this application.

Nantucket Cable Project

What's the most reliable, environmentally sensitive, and cost-effective way to meet Nantucket's growing need for more electricity? We looked hard at the island's energy conservation and consumption. And in 2005, we began construction of Nantucket's second submarine cable from Cape Cod.

Delivery and distribution

We’re an alternative source of energy circulation to the people. We deliver electricity and gas to more than 3.3 million customers in Massachusetts, New York and Rhode Island.

National Grid also has related businesses, such as Liquified Natural gas (LNG) importation and storage, land remediation and metering.

Capacity update - Massachusetts

Capacity update - Rhode Island