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Andrew Square to Dewar Street Reliability Project

Why Are We Doing This Project?

To improve the reliability of Boston’s electric system now and into the future, a new 2.1 mile underground 115-kilovolt (kV) transmission line will connect Eversource's Andrew Square substation to the Dewar Street substation.

The project also includes improvements within the existing fence lines of our substations, to further ensure the delivery of safe, reliable power.

Where Is This Work Being Done?

The 2.1-mile transmission line will run under streets in Dorchester and South Boston, connecting our Andrew Square and Dewar Street substations.

View an interactive Google map that shows estimated locations of manholes and duct bank that will be installed during the construction of this project.

When Is The Work Being Done?

  • Start of construction*: Second quarter 2022
  • Projected in-service date*: Fourth quarter 2025

* Pending all necessary siting and permit approvals

About this project

  • Route length: Approximately 2.1 miles
  • Line voltage: 115,000-volt (115-kV) underground transmission line
  • Siting review by: EFSB

Information available in additional languages

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.

Please follow all local detour and traffic signage to move safely around work zones. 

Andrew Square Substation

Week of June 16

  • Crews plan to continue work at the Andrew Square substation located along Ellery Street. This work consists of forming and altering the foundation of the control house site, performing survey tests, and continued electrical work within the substation property.
  • Equipment that may be needed to complete this activity includes excavators, front-end loaders, concrete cutting saws and jackhammers.
  • All contractor vehicles will be parked inside the substation fence.

Mary Ellen McCormack

Week of June 16

O’Connor Way

  • Crews will be mobilized on O’Connor Way, inside the Mary Ellen McCormack Community to prep the Electric Manhole for future cable work.
  • Work will be conducted between the permitted hours of 7 a.m. to 4 p.m.
  • As our crews work on O’Connor Way continues, traffic will be provided access.
  • There will be 'No parking' signs posted along O’Connor Way the length of the work zone. There will be no parking allowed in these spots during daytime work hours. Police details have been requested to assist with traffic management during the use of the construction work zone.

O'Callaghan Way

  • Crews will be mobilized on O’Callaghan Way, between Gavin Way and Sterling Square, to perform restoration activities.
  • Crews will be restoring the pedestrian sidewalk with concrete-cement.
  • All work will be contained within a temporary work zone along O’Connor Way.
  • There will be 'No parking' signs posted along O’Callaghan Way the length of the work zone. There will be no parking allowed in these spots during daytime work hours.
  • For pedestrians, please adhere to all detour signs as the sidewalk will be closed while it’s being restored.

Morissey Boulevard

Week of June 16

No work is scheduled this week.

    Savin Hill

    Week of June 16

    Grampian Way

    Crews will be mobilized at the concrete vault location on Grampian Way to perform conduit testing and cable pulling activities.

    There will be 'No parking' signs posted along the length of the work zone; there will be no parking in these locations during the posted daytime hours.

    Springdale Street

    Restoration activities are scheduled to continue and last the duration of the week.

    Dewar Street Substation

    Week of June 16

    Crews plan to continue work at the Dewar Street substation located near 65 Bay Street. This work consists of forming and altering the foundation of the control house site, performing survey tests, and continued electrical work within the substation property.

    Equipment that may be needed to complete this activity includes excavators, front-end loaders, concrete cutting saws and jackhammers.

    All contractor vehicles will be parked inside the substation fence.

    Traffic Management Plans

    Working in consultation with town and state officials, including the Massachusetts Department of Transportation, we developed a traffic management plan (TMP) for each section of the project.

    The TMPs include a detailed site plan, hours of construction and area-specific traffic controls.

    All TMPs are subject to change and may be updated often.

    Siting Review

    We filed a petition with the Massachusetts EFSB for approval to construct and operate the new 115-kV transmission line.

    The petition filing is part of the regulatory review process, as defined by Massachusetts state statutes.

    On March 1, 2019, we submitted the following Siting Petition to the EFSB:

    The EFSB held a Public Comment Hearing on June 26, 2019, in Boston, where individuals and groups affected by the initial petition were given the opportunity to voice feedback to the Siting Board.

    The Siting Board conducted a remote Siting Board meeting using Zoom on June 30, 2021, at 1 p.m. to listen to comments and vote on whether to approve, approve with conditions or reject the project.

    The Siting Board's Final Decision to approve the project was issued on July 2, 2021.

    Community Outreach

    We're committed to engaging city officials, residents, businesses, community groups and other stakeholders about project activities through municipal briefings, mailings, virtual meetings and door-to-door outreach.

    Sign up for weekly updates.

    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 ProjectInfoMA@eversource.com.