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Mystic-East Eagle-Chelsea Reliability Project

EFSB 22-01: Project Change request by NSTAR Electric Company d/b/a Eversource Energy ("Eversource"), in EFSB 14-04/D.P.U. 14-153/14-154, of the facility approved by the Energy Facilities Siting Board in its Final Decision dated December 1, 2017.

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Table of Contents

Project Information

Map image of the project location

Filings related to this proceeding can be found in the DPU Docket File Room.  The Fileroom page for a proceeding represents the official record for that proceeding.  The Siting Board previously approved the Project in its December 1, 2017 Final Decision in EFSB 14-04/D.P.U. 14-153/14-154.  The Board issued its final decision in this proceeding on February 26, 2021, linked below.

Final Decision | Decisión Final

The Final Decision was preceded by the Tentative Decision, which was the Board deliberated and voted on during the board meeting.  The Tentative Decision is linked below:


Tentative Decision | DECISIÓN TENTATIVA

Summary of Tentative Decision | RESUMEN DE LA DECISIÓN TENTATIVA

On February 16, 2022, Eversource requested that the Siting Board grant certain state and local permits necessary to construct and operate a new East Boston Substation (“Substation” or “Project”).  That proceeding has been docketed as EFSB 22-01.  Information on EFSB 22-01 can be found at https://www.mass.gov/info-details/east-eagle-certificate

Board Meeting

The Energy Facilities Siting Board concluded its Board meeting in EFSB 14-40A/D.P.U. 14-153A/14-154A on Monday, February 22, 2021.  The Board meeting was held over four days.  The purpose of the Siting Board meeting was to deliberate and vote on whether to approve, approve with conditions or amendments, or reject a Tentative Decision issued by the Siting Board on February 28, 2020 that recommended approval of a Project Change that NSTAR Electric Company d/b/a Eversource Energy submitted to the Siting Board on November 15, 2018 in connection with the Mystic-East Eagle-Chelsea Reliability Project (“Project”). 

Recordings and transcripts of the meetings, where available, are linked below.

December 16, 2020:  English Transcript | Spanish Transcript

February 8, 2021:  English Transcript (Part 1) | English Transcript (Part 2) | Spanish Transcript (Part 1) | Spanish Transcript (Part 2) | English Recording (Part 1) | English Recording (Part 2) | Spanish Recording (Full)

February 9, 2021: English Transcript | Spanish Transcript | English Recording | Spanish Recording

February 22, 2021: Agenda | English Transcript | Spanish Transcript | English Recording | Spanish Recording

Contact for Mystic-East Eagle-Chelsea Reliability Project


(617) 443-1116


Department of Public Utilities
1 South Station, 3rd floor, Boston, MA 02110

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