Sudbury to Hudson Transmission Reliability Project

Eversource is proposing to construct a new 115-kilovolt (kV) transmission line between Sudbury and Hudson, MA. 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.

Eversource’s proposed 9-mile route includes 7.6 miles within an existing, inactive Massachusetts Bay Transportation Authority (MBTA) railroad bed. The remaining 1.4 miles are located under streets within the town of Hudson. The MBTA property portion includes two different design options – an all-overhead line and an all-underground line. Approximately 4.3 miles of the line will be in Sudbury and 4.7 miles in Hudson. This route also includes small sections within Marlborough and Stow.

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


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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)
  • Permitting by: local, state, and federal regulatory agencies

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): ​First Quarter 2017
  • File Siting Petition with the EFSB: ​​First Quarter 2017
  • EFSB Public and Evidentiary hearings:  To be determined by the EFSB
  • Start of ​construction (pending all necessary approvals): ​2018
  • Estimated ​in-​service ​date: ​2019

Massachusetts Energy Facilities Siting Board

This project requires approval from the Massachusetts 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. Abutting and nearby property owners will be informed of the public hearing date(s) and are encouraged to participate.

The regulatory approval 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​.


Keeping the lines of communication open is an important part of our work in your community. 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, if approved.

Regional Open Houses

Regional open houses were held at Hudson Town Hall on March 15, 2016, and Sudbury Town Hall on March 16, 2016. Regional 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.