Sudbury to Hudson Transmission Reliability Project

Eversource is proposing to construct a new 115-kilovolt (kV) transmission line between Sudbury and Hudson, M​ass. This upgrade is one of a suite of projects designed to improve the reliability of the electric system serving the Greater Boston area, both today and in the future.

The new line would be constructed between the Eversource substation in Sudbury, and the Hudson Light and Power substation in Hudson.

Throughout the project planning stages, Eversource proactively reached out to municipal officials, local community groups and other stakeholders to gather feedback on the proposed project. Based on feedback received, Eversource is proposing a 9-mile, all-underground line as the preferred route and design.

The preferred route includes 7.6 miles within an existing, inactive Massachusetts Bay Transportation Authority (MBTA) railroad corridor, passing through Sudbury, Marlborough, Stow and Hudson. The remaining 1.4 miles are located under streets in Hudson.

As part of the siting process, an alternative, in-street route will also be offered for the Massachusetts Energy Facility Siting Board’s (EFSB) consideration. This approximately 10.5-mile route would be underground, under streets in Sudbury, Hudson and Stow.  

Map Sudbury to Hudson Transmission Reliability Project map

* Click to Enlarge 

Project Facts (Proposed Route):

  • Route ​length: 9 miles
  • Line location: Sudbury, Marlborough, Stow and Hudson, MA
  • Line ​voltage: 115,000-volt (115-kV) transmission line
  • Siting ​review ​by: ​ Massachusetts Energy Facilities Siting Board (EFSB)

Estimated Timetable (Subject to Change):

  • Public Open Houses: March 15 & 16, 2016
  • File Environmental Notification Form for review under the Massachusetts Environmental Policy Act (MEPA): ​Second Quarter 2017
  • File Siting Petition with the EFSB: ​​April 20, 2017
  • EFSB Public and Evidentiary hearings: May 25 and June 1, 2017
  • Start of ​construction (pending all necessary approvals): ​2018
  • Estimated ​in-​service ​date: ​2019

Massachusetts Energy Facilities Siting Board (EFSB)

This project requires approval from the EFSB. The EFSB siting process includes both public and evidentiary hearings. The public and other interested stakeholders are given the opportunity to participate in the siting process through the EFSB-sponsored public hearing. Owners of property abutting and near the project will be informed of the public hearing date(s) and are encouraged to participate.

The regulatory process also requires approval from local, state and federal, permitting agencies, including environmental agencies.

To learn more about the siting process and how to participate, visit the EFSB website​.

On April 20, 2017, Eversource submitted a Petition to the EFSB for approval to construct the Sudbury to Hudson Transmission Reliability Project.

The EFSB's docket is available for viewing in the organization’s file room. Eversource’s filing is docket number EFSB17-02.

EFSB Public Comment Hearings 

EFSB-sponsored public hearings are being held to give local residents, business owners, and other stakeholders an opportunity to ask questions, and provide comments on the proposed project.

Thursday, May 25, 2017, 7 p.m.
Lincoln - Sudbury Regional High School Auditorium
390 Lincoln Rd., Sudbury, MA

Thursday, June 1, 2017, 7 p.m.
Hudson High School Auditorium 
69 Brigham St., Hudson, MA


We have engaged town officials, residents, businesses, community groups and other stakeholders through municipal briefings, open houses and meetings – answering questions and listening to concerns about the project.

We will continue these outreach efforts as the project proceeds through the siting process and into construction.

Regional Open Houses

Regional open houses were held at Hudson Town Hall on March 15, 2016, and Sudbury Town Hall on March 16, 2016. These open houses gave local residents and business owners an opportunity to learn more about the project, ask questions, and provide comments to subject matter experts from Eversource. 


For more information about the Sudbury to Hudson Transmission Reliability Project, send an email to or call 800-793-2202.