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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 preparing to construct the Mystic to Woburn Line Project.

The project includes a new 115-kilovolt (kV) underground transmission line that will connect the Mystic substation in Everett, MA, 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

* Click to Enlarge

Project Facts:

  • Route Length: Approximately 8  miles
  • Towns: Everett, Boston (Charlestown), Somerville, Medford, Winchester, and Woburn, MA
  • Line Voltage: 115,000 volt (115-kV) underground transmission line
  • Siting Review By: Energy Facilities Siting Board (EFSB)

Estimated Timetable (Subject to Change):

  • 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 In-Service Date: 2018

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 will begin in the first quarter of 2018, once we receive all necessary permits.

Construction started at the Mystic Substation in late July 2017. All construction activities will be inside the fence at the substation. No substation expansion is planned.

Construction will begin in the first quarter of 2018, once we receive all necessary permits.

Mystic Avenue between Memorial Road and Grant Street - In late 2017, crews completed installation of two underground concrete vaults and over 1,600 feet of the protective tube called conduit (which will house the new power line) on Mystic Avenue. 

Mystic Avenue between Memorial Road and Middlesex Avenue - Starting the week of November 13, crews installed underground concrete vaults and digging trenches in Somerville. 

Construction within additional city roads will begin in the first quarter of 2018, once we receive all necessary permits.

Aberjona River & Wedgemere MBTA Station - Construction activities near the Aberjona River began the week of February 12. Activities include survey and work site set-up, which will include brush clearing and the construction of a temporary dam within the Aberjona River at a height of about 7 feet.

Once the temporary dam is constructed, crews will dig a trench within the river and install the conduit to contain the transmission line. This work will extend from the west bank of the Aberjona River near the Wedgemere MBTA Station to the east bank near Fenwick Road. During this phase of construction, bypass pumps for water in the river will be required to run continuously at the work site.

In addition, crews will install an underground concrete vault and trench between the Aberjona River and the Wedgemere MBTA Station. While the Wedgemere MBTA Station will remain open, pedestrian detours will be used around work areas. Commuters taking inbound trains to Boston should plan accordingly.

Construction activity at the Aberjona River and Wedgemere MBTA Station is expected to be complete in April of 2018.

Construction has begun at the Woburn Substation. Excavating and trenching on the right of way outside the substation fence began in November 2017.


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