Green Line is a high voltage direct current (HVDC) electric transmission system that will transfer up to 1000 megawatts (MW) of electric energy from Aroostook County, Maine to greater Boston, Massachusetts. The full route is via a combination of a terrestrial transmission line in Maine and submarine cable across the Gulf of Maine to Massachusetts. Converter stations at each end of a +/-320 kV direct current (DC) transmission line converts alternating current (AC), like that used in the typical household, to direct current (DC). DC is the most efficient way to move electricity long distances. HVDC systems provide great flexibility and near instantaneous control over how much and in which direction power flows, thus proving many reliability benefits to the larger electric grid.
The New England States Committee on Electricity (NESCOE) sent a letter to ISO-NE on January 21st announcing an agreement of the six New England States to issue “one or more requests for proposals…to advance the development of transmission infrastructure that would enable delivery of at least 1200 MW and as much as 3600 MW of clean energy into the New England electric system from no and/or low carbon emission resources.”… (Read the full letter.)
Green Line will strengthen the transmission grid in New England and help provide greater access to competitively priced non-carbon emitting resources in Maine and eastern Canada. Read more…
Governor LePage (ME) and Governor Patrick (MA) issue press releases announcing agreement on moving ahead with new regional infrastructure. (See releases here…)