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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. The proposed project also includes improvements within the existing fence lines of the substations. Read a fact sheet about the project.

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:


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

Estimated Timetable (subject to change): 

  • EFSB Public Comment Hearing: Second Quarter 2019
  • 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


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 concerns 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.