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