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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.

At Eversource, we're always working to serve you better. 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
  • 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


Hudson & Stow

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

In Hudson and Stow, crews are conducting limited tree cutting, brush clearing and soil sampling, starting at Wilkins Street in Hudson, moving east toward the Hudson and Sudbury town border, then crossing into Stow for approximately 300 feet.

Soil sampling is an activity where a small amount of soil is collected from underneath the ground. The condition of the soil is then evaluated to help Eversource finalize the design of the project. These activities typically take a few days at each location, with equipment on site during that time.

Eversource received approval from the Hudson Conservation Commission on April 18, 2018, and from the Stow Conservation Commission on March 6, 2018, to conduct the limited tree cutting to support soil sampling. In addition, all tree-cutting and brush-clearing activities are being completed under the supervision of a licensed arborist.

Beginning in late June, crews will be in the streets doing "test pitting," which involves opening the pavement in certain areas to locate existing underground utilities. This is for an engineering analysis. Eversource is working with local officials to manage traffic, make sure there are safe working conditions, and make it easier for vehicles and pedestrians to move through these areas. 

Hudson, Marlborough, Stow and Sudbury

In Sudbury, Marlborough, Stow and Hudson, Eversource will have crews in the field completing the following activities (schedule is subject to change):

  • Archaeological Surveying: During archaeological investigations, crews are reviewing locations for the presence of historic artifacts. This work will continue until the end of July, depending on weather and ground conditions. All investigations will be done in the MBTA corridor.
  • Turtle Surveys: Crews are currently working in the MBTA corridor approximately two days per week to survey the quantity and condition of turtles in the area. This work will continue through July 2018.
  • Wildlife Habitat Evaluations: Crews are working in the MBTA corridor to evaluate wildlife habitats. This effort should be completed by mid-June 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 July 26, 2018, Eversource submitted the Final Environmental Impact Report (FEIR) to the MEPA Office for review. The public is given the opportunity to provide comment on the FEIR.  All comments are due by Friday, September 7, 2018.

To submit comments to MEPA by mail or email:

Secretary Matthew Beaton
Executive Office of Energy and Environmental Affairs
Page Czepiga, EEA No. 15703
100 Cambridge Street, Suite 900
Boston, MA 02114

Email comments to:

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.