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Mystic - East Eagle - Chelsea Reliability Project

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

At Eversource, we're always working to serve you better. We are installing a new substation in the East Eagle neighborhood of East Boston, Massachusetts; and 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 in Chelsea.

The East Eagle - Mystic transmission line will be constructed under the streets in Chelsea and Everett, and connect to an existing duct bank connecting Chelsea and East Boston. The East Eagle - Chelsea transmission line will be located within an existing duct bank and manhole system in East Boston and Chelsea.

Information about the project is also available in:


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Project Facts:

  • East Eagle Substation:  New substation on East Eagle Street in East Boston, Mass.
  • Route length: Approximately 5 miles
  • Cities: Boston, Chelsea and Everett, Mass.
  • Line voltage: 115,000 volts (115-kV)
  • Siting review completed by: Energy Facilities Siting Board and the Department of Public Utilities in Massachusetts

Estimated Timetable:

  • Energy Facilities Siting Board approval: December 1, 2017
  • Start of construction on transmission lines:  Second Quarter 2018
  • Projected in-service date: Second Quarter 2019 for transmission line

Construction Updates

First, 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 November 5, 2018: 

  • There will be no Eversource transmission line work for this project in Boston this week.

Week of November 5, 2018:

  • There will be a single lane closure on Williams Street for utility excavation between Spruce and Arlington streets on Monday, November 5, through Friday, November 9, from approximately 7 a.m. to 3:30 p.m. and from 6 p.m. to 4 a.m. Expect alternating traffic patterns during this period.

Week of November 5, 2018:

  • Eversource will be working day and night shifts on Beacham and Robin streets, beginning Monday, November 5, through Saturday, November 10, from 7 a.m. to 3 a.m.  This work will require alternating traffic patterns along Beacham and Robin streets. Crews will also be working on Dexter Street from 6 p.m. - 2 p.m. beginning Friday, November 2, 2018.

Community Outreach

Before starting construction in a community, we host public open houses to give local residents and business owners an opportunity to learn more about the project, and ask questions of our subject matter experts.

Open Houses were held in:

  • Chelsea - February 8, 2018, and June 14, 2018. 
  • Everett - February 27, 2018
  • East Boston - To be determined

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. 

Traffic Management Plans

Working in consultation with town and state officials, including the Mass. Department of Transportation, Eversource has developed a set of Traffic Management Plans (TMPs) for each section of the Mystic - East Eagle - Chelsea Reliability Project.

The TMPs include conditions specific to routing as made by the EFSB in its final decision. The TMPs illustrate detailed site plans, showing underground line locations, hours of construction, area-specific traffic controls, and more.

Please note, TMPs are subject to change and may be updated.

Contact Information

For more information about the project, send an email to or call 800-793-2202.