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Mystic - East Eagle - Chelsea Reliability Project

Why Are We Doing This Project?

Electric demand is growing in eastern Massachusetts, and the area needs an additional substation and transmission capacity to support the reliable delivery of electric power to meet the region's current demand.

Where Is This Work Being Done?

We are building a new substation in the East Eagle neighborhood of East Boston, the Eagle Hill Substation. We have installed two new underground transmission lines to connect the new substation to existing substations in Everett and Chelsea.

We are also making minor improvements within the fenced area of the existing Mystic Substation on Broadway in Everett, and the existing Chelsea Substation on Willoughby Street.

View an interactive Google map that shows estimated locations of manholes and duct bank that will be installed during the construction of the East Eagle Substation.

Below is an artistic rendering of the new East Boston substation, designed in collaboration with and voted on by residents of the neighborhood. The final built design may vary based on in-field conditions.

Construction Updates

​We're committed to keeping neighbors, businesses and community members informed on project activities during construction. You can also sign up to receive email updates.

This work will not interrupt your electrical service. 

Week of May 27

Next week, crews will be working on Eversource's property at 400 Condor Street and on Boston city streets, continuing with duct bank installation, as well as continuing to survey for underground utilities at various locations in Eagle Hill. 

No work will take place on Monday, May 27 in observance of Memorial Day.

Due to the complexities of underground construction and weather, this schedule is subject to change. For updates on active work locations, please view the interactive Google map.

Next week, you may see crews:

Working on foundation installations at the East Eagle substation site. Working on duct bank installation on the following streets:

  • Lexington Street between Prescott Street and Eagle Square
  • Condor Street between Putnam and Glendon Street
  • Lexington Street between Eagle Square and Shelby Street

Please follow local traffic signage.

Temporary street closures and parking restrictions may be in place on the following streets:

  • Lexington Street between Prescott Street and Eagle Square
  • Condor Street between Glendon and Putnam Street
  • Lexington Street between Eagle Square and Shelby Street

Work hours will be 7 a.m. to 6 p.m.

The map shows a pedestrian detour on Condor Street, currently in place to accommodate ongoing work at the substation.

Public access to the police station will remain open at all times.

Traffic Management Plans

Working in consultation with the City of Boston, we developed a traffic management plan (TMP) for each phase 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.

Read the temporary traffic control plans for East Eagle roads.

When Is The Work Being Done?

Transmission Lines

  • Start of construction on transmission lines: Began second quarter 2018
  • Transmission lines construction completion date: September 17, 2020


  • Start of construction on substation: January 11, 2023

Information Available in Additional Languages

Siting Review



  • Approved by the Energy Facilities Siting Board (EFSB) (EFSB 14-04/D.P.U. 14-153/14-154)December 1, 2017 
  • EFSB approval for the substation (EFSB 14-04/D.P.U. 14-153/14-154): December 1, 2017
  • File notice of substation project change petition with the EFSB: November 15, 2018
  • EFSB approval for substation project change (EFSB14-40A/D.P.U. 14-153A/14-154A): February 22, 2021
  • EFSB approval for a Certificate of Environmental Impact and Public Interest (EFSB22-01): November 30, 2022

Community Outreach

We are committed to keeping neighbors, businesses and community members informed on project activities during construction. 

See our past outreach efforts listed below by year.




Substation Enclosure Design Focus Group

As part of the EFSB’s final decision, Eversource reinitiated the public engagement process for the design of the enclosure for the East Eagle Substation in East Boston. At the direction of the EFSB, this process began with a focus group of residents and government officials, who are providing feedback into the initial design of the enclosure.

Focus Group Meetings

2019 - 2020

The East Eagle Substation information session was held on February 5, 2019. Following the information session, the Energy Facilities Siting Board held a public comment hearing. Additionally, the East Eagle Substation Aesthetic Open House was held on January 14, 2020.

East Eagle substation facts and frequently asked questions

Eversource representatives listened carefully to the community's questions and concerns during the January 14, 2020, open house. As promised during the open house, we developed "Addressing the Concerns of the Community," a document with project facts and frequently asked questions about the East Eagle Substation in East Boston.

We also created a short video that provides the history and an overview of the project.

Boston City Council - Committee on City & Neighborhood Services

On Friday May 22, 2020, the City of Boston held a public hearing to discuss the approved East Eagle Street Substation; this matter was sponsored by Councilor Lydia Edwards and referred to the Committee on City and Neighborhood Services on January 29, 2020. During the hearing Eversource representatives listened intently and responded to the community's questions and concerns. As promised during the hearing, we're publishing our load forecasting graphics and our emergency response plan.


Open houses were held in Chelsea on February 8 and June 14, 2018; and in Everett on February 27, 2018. As we begin construction in the local communities, we will mail start of construction letters to property owners along the route, and conduct door-to-door outreach to nearby property owners, residents and local businesses.

Customer notifications

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