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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 2019 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.

 

Crews will soon complete pipe installation on Mystic Avenue between Harvard Street and Crescent Street. The pipe within the trenches at these locations will contain the new transmission cable. Once installation is complete, the area will be backfilled and patched until final restoration. This work is expected to be completed the week of November 18.

A temporary traffic/work setup is currently in place on South Street to support work associated with a Horizontal Directional Drill (HDD) under the Mystic River. HDD is a method for installing underground pipe without digging trenches. The work setup will also occupy a Department of Conservation and Recreation (DCR) property on both sides of the Mystic River, 24 hours a day, seven days a week. Work at this location is expected to continue for the next two weeks.

  • The temporary work zone will require a modified traffic pattern on South Street.
  • On-street parking spots on South Street between Winthrop Street and Touro Avenue will be restricted for the duration of the work.
  • A pedestrian detour around the work zone will be necessary for the duration of the work.
  • Eversource will use local police when needed to assist with traffic management.

A temporary work zone on Department of Conservation and Recreation land on the north side of the Mystic River in the vicinity of the Winthrop Street Garden will remain in place until late November as crews complete the Horizontal Directional Drill (HDD) under the Mystic River.

Crews recently completed the installation of an underground vault within a temporary work zone on Winthrop Street between Exeter Street and Brooks Street. This work zone will remain in place on Winthrop Street until late November as crews backfill the vault location. The pedestrian detour around this work zone will remain in place until the work zone is removed. Pedestrians walking on the north side of Winthrop Street will be directed via a temporary crosswalk to the south side of Winthrop Street. This detour will impact students walking to and from Medford High School. 

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.

In November, crews will install an underground concrete vault on Mystic Avenue near the corner of Mystic Avenue and Grand Union Boulevard. The vault is not located within a travel lane on Mystic Avenue, but an alternate traffic pattern around the work zone will be necessary during construction. These vaults give workers access to underground electrical cables and connections.  

 

Crews are currently installing an underground concrete vault on Woodside Road between Wildwood Street and Pond Street. The work is expected to be complete in mid-November.

Construction hours in this section of Winchester are from 8:30 a.m. to 5 p.m., Monday through Friday.

Crews recently completed cleaning and lining the Massachusetts Water Resources Authority (MWRA) sewer pipes around the MBTA Wedgemere Station on Bacon Street. Initial restoration of areas disturbed by the project is ongoing, with full restoration scheduled for the spring.

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

COMMUNITY OUTREACH

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. 

CONTACT INFORMATION

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