Andrew Square to Dewar Street Reliability Project
As part of always working to serve you better, and to ensure that Eversource continues to reliably serve the City of Boston, Eversource is proposing to install a new, underground, 115-kilovolt (kV) transmission line.
The proposed 2.1-mile transmission line will connect Eversource's Andrew Square Substation to the Dewar Street Substation and be installed under streets in Dorchester and South Boston (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 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.
Project Map and Construction Information
Construction Type Descriptions:
Learn about the construction techniques used in the project, and use the interactive project map to see where that construction is taking place.
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 1, 2019
- EFSB Public Comment Hearing: June 26, 2019
- EFSB Evidentiary Hearings: December 2019
Estimated Timetable (subject to change):
- Tentative Decision from the EFSB: June 17, 2021
- Final Decision from the EFSB: July 2, 2021
- Pre-construction information sessions: Beginning Third Quarter 2021
- Start of construction*: Third Quarter 2022
- Projected in-service date*: Fourth Quarter 2023
* Pending all necessary siting and permit approvals
Traffic Management Plans
Construction Updates
Please know that Eversource takes every safety precaution while working in local communities, and that all people working on the construction project carry identification. The project work will not interrupt electric service to homes or businesses.
Eversource is committed to updating neighbors, businesses, and all community members about project activities, especially during construction. Please keep in mind that the construction schedule may change due to weather or other unexpected circumstances.
Week of December 5, 2022:
- Eversource crews will be excavating and conducting survey work within the substation footprint in preparation for an upcoming control house upgrade.
- This work will include the use of excavators, concrete cutting saws, and jackhammers.
Week of December 5, 2022:
- There will be no work in Mary Ellen McCormick this week.
Week of December 5, 2022:
- Eversource crews will be conducting restoration activities on the Old Colony Avenue median under the Columbia Bridge overpass.
- This work will include the use of excavators, concrete cutting saws, jackhammers, and dump trucks.
- Crews will continue excavating for trenches, working to install conduit, and conducting survey activities heading south on Morrissey Boulevard from the MBTA UMASS Station.
- Crews will continue excavating for trenches, working to install conduit, and conducting survey activities along the grass median at the intersection of Morrissey Boulevard and Bianculli Boulevard.
- This work will include the use of excavators, concrete cutting saws, jackhammers, and dump trucks.
Week of December 5, 2022:
- There will be no work at Savin Hill this week.
Week of December 5, 2022:
- Eversource crews will be excavating and conducting survey work within the substation footprint in preparation for an upcoming control house upgrade.
- This work will include the use of excavators, concrete cutting saws, and jackhammers.
Community Outreach
As the proposed project proceeds through the siting and permitting process, we will continue to engage 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.
Sign up for weekly updates here.
Contact Information
For more information about the Andrew Square to Dewar Street Reliability Project, send an email to ProjectInfoMA@eversource.com or call 833-836-0302.