A strong electrical transmission system is vital to our region’s safety and economic prosperity. To improve reliability and address growing electricity demands identified by ISO-NE, National Grid and Eversource have teamed up to implement the Greater Boston and New Hampshire Solution, comprised of various projects in Massachusetts and New Hampshire.

One of the projects is the Mystic to Woburn Line, a new 115-kilovolt (kV) underground transmission line that will connect the Mystic Substation in Everett and the Woburn Substation, both operated by Eversource. The proposed line will extend approximately 8 miles between the two substations and will pass through Everett, Boston (Charlestown), Somerville, Medford, Winchester, and Woburn. The proposed project also includes improvements within the existing fence lines of the Woburn and Mystic Substations.

On March 9, 2017, Eversource received approval from the EFSB to construct the Mystic to Woburn Line Project. For more information about the Project, please visit the Eversource website.

Construction is expected to begin in 2017, with a projected in-service date of 2018.

For more information about the Mystic to Woburn Line Project, please view our project overview sheet.

For a full listing of past events and public outreach, click HERE.

Massachusetts Energy Facilities Siting Board Filings

To view the MA EFSB's file room docket for this proceeding, please click HERE and enter "EFSB15-03" in the "Docket Number" box at the top left of the page. You can also find links to each of the individual filing documents by clicking HERE. In addition, individual documents are available below.

For more information about the Mystic to Woburn Line Project, please view our project overview sheet; or watch the Project video below, presented at the Public Open Houses in late April and early May 2015.

Mystic to Woburn Line Project Facts

  • Route Length

    • 8 miles

      Approximate Total Length

    Line Voltage

    • 115,000

      Volts (115-kV)

    Siting Regulator

    • Energy Facilities Siting Board (EFSB)


  • Locations

    • Everett, Boston (Charlestown), Somerville, Medford, Winchester, Woburn


  • Estimated Timetable

    • Began Community Outreach

    • Environmental Notification Form (ENF) Filed with Massachusetts Environmental Policy Act (MEPA)

    • Massachusetts Energy Facilities Siting Board (EFSB) Filing

    • EFSB Public Comment Hearing (held in Medford, MA)

    • Start of Construction (pending EFSB approval)

    • Estimated Project In-Service Date

Event Notifications

News and Press