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Andrew Square to Dewar Street Reliability Project

As part of always working to serve you better, and to address customer demand, reliability and capacity issues throughout the Boston area, Eversource is proposing to install a new underground 115-kilovolt (kV) transmission line.

The proposed 2.1-mile transmission line will support future growth in the area – passing through Dorchester and South Boston while connecting Eversource’s Andrew Square Substation to the Dewar Street Substation. (See map below.) The proposed project also includes improvements within the existing fence lines of the substations. 

The project information presented on this webpage is also available in:

Energy Facilities Siting Board

To construct and operate the new 115-kV transmission line, Eversource must file a petition with the Massachusetts Energy Facilities Siting Board (EFSB) for approval. The petition filing is part of the regulatory review process, as defined by Massachusetts state statutes.

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

The EFSB will hold a Public Comment Hearing on Wednesday, June 26, 2019, at 7 p.m., at Boston College High School, Cadigan Lecture Hall, 150 Morrissey Blvd., Boston, Mass., where individuals and groups affected by the initial petition may voice feedback to the Siting Board.


Click map to enlarge

Project Facts: 

  • Route length: Approximately 2.1 miles
  • City: Boston (Dorchester and South Boston), Mass.
  • Line voltage: 115,000-volt (115-kV) underground transmission line
  • Siting review by: Energy Facilities Siting Board (EFSB)
  • Public Open Houses: October 10 & 11, 2018
  • File Siting Petition with the EFSB: March 12019
  • EFSB Public Comment Hearing: June 26, 2019

Estimated Timetable (subject to change): 

  • Tentative Decision from the EFSB: First Quarter 2020
  • Final Decision from the EFSB: Second Quarter 2020
  • Pre-construction Open House*: Second Quarter 2020
  • Start of construction*: Second Quarter 2020
  • Estimated in-service date*: Fourth Quarter 2021

*  Pending all necessary siting and permit approvals

Community Outreach

We will be engaging town officials, residents, businesses, community groups and other stakeholders through municipal briefings, open houses, mailings and meetings – answering questions and listening to any feedback about the project.

Eversource hosted a public open house in South Boston on October 10, 2018, and in Dorchester on October 11, 2018, to give local residents, business owners, and other interested stakeholders an opportunity to learn more about the project, ask questions, and provide feedback.

As the proposed project proceeds through the siting and permitting process, we will continue our community outreach efforts.

Contact Information

For more information about the Andrew Square to Dewar Street Reliability Project, send an email to or call 800-793-2202.