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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 September, crews will perform test pit activity to determine the location of underground utilities. This work will be limited to Alford Street, Sullivan Square and Maffa Way.

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 - In September 2018, crews will perform testing at two vault locations in Medford: one at Mystic Avenue and Harvard Street, and the second at Mystic Avenue and Fulbright Street. Some of the testing will require crews to work continuously for 24 hours. When working beyond normal hours, Eversource will take steps to minimize noise and lighting disturbances.

In September, crews will also perform road repair work on Winthrop Street between Badger Road and High Street.

Also in September and October, crews will be taking soil samples along the project route to help evaluate the condition of the soils. 

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

In September, crews will perform testing at three vault locations in Somerville: one at Mystic Avenue and Memorial Road; a second at Mystic Avenue and Grant Street; and the third at Mystic Avenue and Middlesex Avenue. Some of the testing will require crews to work continuously for 24 hours. When working beyond normal work hours, Eversource will take steps to minimize noise and lighting disturbances. 

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 on Pond Street. Currently, all construction activities are inside the fence at the substation. Excavation and trenching within the right of way (power line corridor) but outside the substation fence are planned for 2019.

CONTACT INFORMATION

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