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Sudbury to Hudson Transmission Reliability Project

Eversource is proposing to construct a new 115-kilovolt (kV) transmission line between Sudbury and Hudson, Mass. This upgrade is one of a group 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

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Project Facts (preferred route and design):

  • Route length: 9 miles
  • Line location: Sudbury, Marlborough, Stow and Hudson, Mass.
  • 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): May 15, 2017
  • Received the Certificate of the Secretary of Energy and Environmental Affairs on the Final Environmental Impact Report (FEIR): September 14, 2018
  • File Siting Petition with the EFSB: April 20, 2017
  • EFSB Public Hearings: May 25 and June 1, 2017
  • Start of construction (pending all necessary approvals): 2019
  • Estimated in-service date: 2020


As part of the design process for the project, Eversource gathered information along the preferred project route, including conducting survey work and subsurface investigations, such as taking samples of soil. All work was completed within the Massachusetts Bay Transportation Authority (MBTA) corridor.

This work was completed in Hudson and Stow in September 2018, and it was completed in Sudbury in November 2018.


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 dates 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.


On May 15, 2017, Eversource submitted an Environmental Notification Form (ENF) to the MEPA Office for review. On June 12, 2017, the MEPA Office held a public site tour and scoping session for the project.

On September 14, 2018, Eversource received the Certificate of the Secretary of Energy and Environmental Affairs on the Final Environmental Impact Report (FEIR) for the Sudbury - Hudson Transmission Reliability Project.

For more information on the MEPA process, please visit their website


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.


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