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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 recently installed an underground concrete vault on Winthrop Street, located between Robinson Road and Winford Way. During the week of August 19, crews will continue working at this location to connect the vault to the pipe that will contain the new transmission cable. These vaults give workers access to underground electrical cables and their connections.

During the week of August 19, crews will begin digging a trench on Winthrop Street between Robinson Road and Playstead Road.

During the week of August 26, crews will begin digging trenches on Mystic Avenue between Harvard Street and Crescent Street.

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.

 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.

Construction within public roadways will begin in 2019 after we receive all necessary permits. 

 

In August, crews will begin cleaning and lining the Massachusetts Water Resources Authority (MWRA) sewer pipes around the MBTA Wedgemere Station on Bacon Street. Construction will begin in 2019 after 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.

COMMUNITY OUTREACH

Before starting construction in a community, we host public open houses to give local residents and business owners an opportunity to learn more about the project and ask questions of our subject matter experts.

A pre-construction information session was held on April 25, 2019. In addition, as we begin construction in the local communities, 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 TransmissionInfo@eversource.com or call 800-793-2202.