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Mystic to Woburn Line Project

To improve reliability and address growing need for electricity identified by ISO-NE, New England’s power grid manager, Eversource is constructing the Mystic to Woburn Line Project.

At Eversource, we're always working to serve you better. The project includes a new 115-kilovolt (kV) underground transmission line that will connect the Mystic Substation in Everett, Mass., and the Woburn Substation. The line will extend approximately 8 miles between the two substations and will pass through Everett, Boston (Charlestown), Somerville, Medford, Winchester, and Woburn.

The project also includes improvements within the existing fence lines of the Woburn and Mystic Substations. Information about the project is also available in Spanish, Portuguese and Haitian Creole.

Map of the project route

Project Facts:

  • Route length: Approximately 8 miles
  • Towns: Everett, Boston (Charlestown), Somerville, Medford, Winchester, and Woburn, Mass.
  • Line voltage: 115,000-volt (115-kV) underground transmission line
  • Siting review by: Energy Facilities Siting Board (EFSB)
  • File Environmental Notification Form for review under the Massachusetts Environmental Policy Act (MEPA): April 30, 2015
  • File Siting Petition with the EFSB: May 20, 2015
  • Petition approval by the EFSB: March 9, 2017
  • Start of construction: July 2017

Estimated Timetable (subject to change):

  • Estimated in-service date: 2020

Energy Facilities Siting Board

For an electric transmission line project, such as the Mystic to Woburn Line Project, the Massachusetts Energy Facilities Siting Board (EFSB) Petition Filing is part of the siting regulatory view process, as defined by Massachusetts state statutes. On March 9, 2017, Eversource received approval from the EFSB to construct the Mystic to Woburn Line Project.

Traffic Management Plans

Working in consultation with town and state officials, including the Mass. Department of Transportation, Eversource has developed a Traffic Management Plan (TMP) for each section of the Mystic-Woburn Line Project.

The TMPs include conditions specific to routing by the EFSB in its decision, a detailed site plan showing underground line location, hours of construction, area-specific traffic controls and more.

Some of the TMPs below are large in size and might take some time to load or download.

Please note, TMPs are subject to change and may be updated often.

Construction Updates

Eversource is committed to updating neighbors, businesses and all community members about project activities, especially during construction.

The sections below feature construction updates for each town. Please note that the project work is not expected to interrupt electric service to homes or businesses.

Construction within public roadways around Sullivan Square will begin in 2020 after we receive all necessary permits.

Mystic Substation - Construction started at the Mystic Substation on Alford Street in late July 2017. All construction activities are within the fence at the substation. No substation expansion is planned. 

Mystic Substation - Construction started at the Mystic Substation on Alford Street in late July 2017. All construction activities are within the fence at the substation. No substation expansion is planned.


Beginning the week of December 2, crews will prepare to install an underground concrete vault near the corner of South Street and Maple Avenue. These vaults give workers access to underground electrical cables and their connections. 

The horizontal directional drill (HDD) under the Mystic River is now complete and all residents now have full access to their driveways.

On-street parking on South Street between Curtis Street and Touro will be restricted as crews complete vault installation work in this area.

Eversource thanks South Street and neighborhood residents for their patience and cooperation during this phase of work. 

Work in and around the Winthrop Street community garden will continue through early December. 

Parking restrictions will be necessary at various locations along the project route and will be posted in advance.

Construction hours in Medford will begin after 7 a.m. and will finish on or before 4 p.m., Monday through Friday, except in the following areas:

  • On Winthrop Street between Lawrence Road and the Mystic Valley Parkway, work hours will be 9 a.m. to 4 p.m., Monday through Friday.
  • On Mystic Avenue between Harvard Street and Crescent Street, work hours will be 9 a.m. to 3 p.m., Monday through Friday.

No additional construction activity within the public right of way is anticipated until 2020.


During the week of December 2, crews will be excavating a trench to accommodate pipe installation. Once complete, crews will then install pipe within the trenches at these locations to contain the new transmission cable. Steel road plates will be used temporarily to safely secure the area at the end of each day. 

All associated activities for this phase of work will take place on private property. Some work activities may necessitate a temporary traffic setup to allow crews and equipment to safely enter and exit the work area off Pond Street.

No additional construction activity within the public right of way is anticipated until the spring of 2020.

Construction is ongoing at the Woburn Substation on Pond Street. Currently, all construction activities are inside the fence at the substation.


Before starting construction in a community, we will mail start of construction letters to property owners along the route and conduct door-to-door outreach to nearby property owners, residents and local businesses. 


For more information about the Mystic to Woburn Line Project, send an email to or call 800-793-2202.