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Mystic to Woburn Line Project

Why Are We Doing This Project?

This project improves reliability and addresses the growing need for electricity in the area. We completed construction of the project in March 2024, and the new transmission line was energized and put into service on March 30, 2024. 

Where Is This Work Being Done?

This project included a new 115-kilovolt (kV) underground transmission line that connects Eversource’s Mystic Substation in Everett and Eversource’s Woburn Substation.

The line extends approximately 8 miles between two existing substations, passing through Everett, Boston (Charlestown), Somerville, Medford, Winchester, and Woburn. The project also included 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.


About This Project

  • Route length: Approximately 8 miles
  • Line voltage: 115,000-volt (345-kilovolt [kV]) underground transmission line
  • Siting review by: EFSB

    When is the Work Being Done?

    • Start of construction: July 2017
    • Projected in-service date: First quarter 2024

    Construction Updates

    We are committed to keeping neighbors, businesses and community members informed on project activities during construction. The schedule may change due to weather or other unexpected circumstances.

    As of May 17, crews have completed work in Falmouth for the season. Work is not permitted during the summer season, so you can expect construction updates to commence again in fall 2024.  

    Boston | Charlestown

    Week of April 8

    There are no construction activities planned in Charlestown at this time. 


    Mystic Substation

    Construction started at the Mystic Substation on Alford Street in late July 2017.

    All construction activities are within and around the substation. No substation expansion is planned.


    Week of April 8

    There are no construction activities planned in Medford at this time.


    Week of April 8

    There are no construction activities planned in Somerville at this time.


    Week of April 8

    There are no construction activities planned in Winchester at this time.



    Woburn Substation

    All construction activities remaining on the Mystic to Woburn Line Project are within and around the substation fence. No substation expansion is planned.

    Energy Facilities Siting Board

    The Massachusetts ESFB Petition Filing is part of the regulatory review process, as defined by Massachusetts state statutes.

    On March 9, 2017, we received approval from the EFSB to construct the project. See EFSB 15-03 Final Decision.

    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.

    Door-to-door outreach efforts for the project are currently limited to mailing letters and leaving door hangers without knocking (to avoid face-to-face communication). Full in-person communication efforts will resume when appropriate.

    Have Questions?

    Keeping the lines of communication open is an important part of our work in your community.

    For more information about this project, please call the project information hotline at 1-833-836-0302 or email