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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

* Click to Enlarge

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)

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: 2019

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.

In July 2018, Eversource will open the pavement in three locations -- two between Maffa Way and Main Street, and one on Alford Street -- to confirm the location of existing utilities along the new line route and at manhole locations.

Construction within public roadways around Sullivan Square will begin in 2019, once 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.

Mystic Avenue between Golden Avenue and Moreland Street - Crews continue to install underground concrete vaults and dig trenches on Mystic Avenue in Medford. Construction hours for this area are 9 p.m. to 5 a.m. Construction in this section of Medford is expected to be complete in early August 2018.

Construction in the remaining sections of Medford will begin in the fourth quarter of 2018, once we receive all necessary permits.

Crews continue to install pipe on Mystic Avenue in Somerville, north of Temple Street. Construction hours in this area will be 9 a.m. to 3 p.m. Monday through Friday. Construction in this section of Somerville is expected to be complete in late July 2018. 

Construction in the remaining sections of Somerville will begin in the fourth quarter of 2018. 

Construction will begin in the first quarter of 2019, once we receive all necessary permits. 

Construction is ongoing at the Woburn Substation. Excavating and trenching on the right of way (power line corridor) outside the substation fence began in November 2017, and will continue into the third quarter of 2018.

CONTACT INFORMATION

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