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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.

When Is The Work Being Done?

  • Start of construction*Second Quarter 2022
  • Projected in-service date*: Fourth Quarter 2024

* Pending all necessary siting and permit approvals

Construction Updates

We take every safety precaution while working in local communities, and all people working on the construction carry proper identification. The project work will not interrupt electric service to homes or businesses.

We are committed to updating neighbors, businesses and all community members about project activities, especially during construction. The construction schedule may change due to weather or other unexpected circumstances.

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, while adhering to COVID-19 social distancing and other related health and safety guidelines.

Sign up for weekly updates here.

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