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Walpole To Holbrook Reliability Project

To improve reliability and address the growing need for electricity in the Greater Boston and surrounding areas, Eversource is constructing the Walpole to Holbrook Reliability Project.

At Eversource, we're always working to serve you better. The project includes a new overhead 115-kilovolt (kV) transmission line on an existing right of way (power line corridor) that will connect the Walpole Substation in Walpole, Mass., and the Holbrook Substation in Holbrook. 

The project will cover approximately 14.7 miles between the West Walpole and Holbrook Substations. The new line between Walpole and Holbrook will be placed on almost entirely on existing structures.

We will also install new structures between the West Walpole Substation and the Walpole Substation, install a new switching station – a type of substation – in Sharon, and make modifications to the existing substations in Walpole and Holbrook.


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Project Facts:

  • Route Length: Approximately 14.7 miles
  • Towns: Avon, Canton, Holbrook, Randolph, Sharon, Stoughton and Walpole, Mass.
  • Line Voltage: 115,000-volt (115-kV) overhead transmission line
  • Siting Review By: Energy Facilities Siting Board (EFSB)

Estimated Timetable (subject to change):

  • File Environmental Notification (ENF) Form for review under the Massachusetts Environmental Policy Act (MEPA): April 15, 2014
  • ENF Certificate Granted: August 29, 2014
  • File Siting Petition with the Energy Facilities Siting Board (EFSB): April 28, 2014
  • Public Comment Hearings: July 21 & 22, 2014, and December 16, 2015
  • Petition approval by the EFSB: September 20, 2017
  • Start of construction: November 2017
  • Estimated In-Service Date: Mid-2019

Energy Facilities Siting Board

For an electric transmission line project, such as the Walpole to Holbrook Reliability Project, the Massachusetts Energy Facilities Siting Board (EFSB) Petition Filing is part of the siting regulatory view process, as defined by Massachusetts state statutes.

On September 20, 2017, Eversource received approval from the EFSB to construct the Walpole to Holbrook Reliability Project.

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.

Eversource is committed to updating neighbors, businesses and the community about project activities, especially during construction. Please note that the project work will not interrupt electric service to homes or businesses.

Project construction began in November 2017 and is expected to be complete in mid-2019.

Work hours during construction will typically be 7 a.m. to 6 p.m., Monday through Friday, and 9 a.m. to 5 p.m. on Saturdays. Due to unexpected weather or other circumstances, the work hours may be extended or performed on a Sunday.

Police officers will be stationed at every major intersection where construction is taking place. More information is available in the Traffic Management Plans below.

No construction planned in the near future.

No electric transmission work is currently taking place. 

 No electric transmission work is currently taking place. 

 No electric transmission work is currently taking place. 

  • Crews are pouring foundations at the Switching Station in Sharon. We expect to complete the work in December 2018. 
No electric transmission work is currently taking place.  

 No electric transmission work is currently taking place.  

Traffic Management Plans

There will be some traffic impacts at certain street crossings during work hours. Police officers and/or construction crews will direct pedestrian and vehicle traffic, as needed. Eversource has worked in consultation with town and state officials, including the Mass. Department of Transportation, to develop a Traffic Management Plan (TMP) for each section of the Walpole to Holbrook Reliability Project. 

The TMPs include conditions specific to routing, as directed by the EFSB in its decision; a detailed site plan showing the overhead line location; the hours of construction; area-specific traffic controls; and more. Please note, this information is approximate and subject to change. Some of the TMP documents are large and might take some time to load or download.

Contact Information

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