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Sudbury to Hudson Transmission Reliability Project

Why Are We Doing This Project?

This new,115-kilovolt (kV) transmission line 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.

Where Is This Work Being Done?

The new line is being constructed between the Eversource substation in Sudbury, and the Hudson Light and Power substation in Hudson. Sign up to receive routine email updates about the project. 

The approved route includes 7.6 miles of underground line within an existing, inactive Massachusetts Bay Transportation Authority (MBTA) railroad corridor, passing through Sudbury, Marlborough, Stow and Hudson. The remaining 1.4 miles of line is being built under streets in Hudson. Click here to sign up to receive routine email updates about the project. 

Eversource is working closely with the Massachusetts Department of Conservation and Recreation (DCR) to co-locate compatible uses within the existing, inactive MBTA corridor. Eversource will conduct the civil work and bridge replacement to prepare the site, install the new transmission line and leave a compacted gravel sub-base to support the Massachusetts Central Rail Trail (MCRT). After the Eversource project is complete, DCR will pave their trail, install safe road crossings and complete final restoration of this publicly accessible shared-use path. This partnership and close coordination of projects has been designed to avoid and minimize impacts to environmental resource areas while leaving behind a key recreational asset.

map-sudbury-to-hudson-dec-18-2019

* View the interactive project map

Traffic Management and Rail Trail Access

Working in consultation with town officials, we developed Traffic Management Plans (TMPs) for construction of the project.

The TMPs include conditions specific to routing by the EFSB in its decision, a detailed site plan showing underground line location, hours of construction, and area-specific traffic controls. All TMPs are subject to change and may be updated often. Due to size, TMPs may take extra time to open/download.

We, in partnership with local officials, developed a plan detailing access and time of year restrictions to rail trails, between White Pond Road and Dutton Road, that intersect with the MBTA corridor.

During construction (including after hours and on weekends), we ask people in the area to avoid walking along and crossing the inactive MBTA corridor. Two crossings of the MBTA corridor will be put in place from May 1 through July 31 during the project construction: one at the Town Line and one at the Marsh to Desert Trail. There may be potential for additional periods of time for these crossings to be open and notice will be provided.

When Is The Work Being Done?

  • Filed Environmental Notification Form for review under the Massachusetts Environmental Policy Act (MEPA): May 15, 2017
  • Received Certificate of the Secretary of Energy and Environmental Affairs on the Final Environmental Impact Report (FEIR): September 14, 2018
  • Filed siting petition with the EFSB: April 20, 2017
  • EFSB public hearings: May 25 and June 1, 2017
  • Received EFSB approval: December 17, 2019
  • Start of construction: Q4 2022
  • Projected in-service date: December 2023 (subject to change)

About this project

  • Route length: 9 miles
  • Line voltage: 115,000-volt (115-kV) transmission line
  • Siting review: Massachusetts Energy Facilities Siting Board (EFSB)

Construction Updates

We're committed to keeping neighbors, businesses and community members informed on project activities during construction.

You can sign up to receive email updates like the ones below:

This work will not interrupt your electric service.

Sudbury

Off Boston Post Road, at the Eversource Sudbury Substation, G. Greene Construction is excavating and building foundations inside the fence line and on Eversource property. Additional Eversource crews are at the site installing structures and other electrical equipment.

In the inactive MBTA rail corridor from the Town line to Dutton Road, crews are installing erosion controls which will be followed by rail/tie removal for the coming weeks. From Dutton Road to Peakham Road in the corridor, vegetation removal is ongoing starting near Dutton Road and moving east, which will be followed by erosion controls and rail/tie removal. Clearing is expected to start between Peakham Road and Horse Pond Road soon. Between the Sudbury Substation and Bridge 127, rail/tie removal is progressing and grading of the limits of work will start in the coming weeks. You can view the project map for details on the locations of these crews in the inactive MBTA corridor.

Approved construction work hours are 7 a.m. to 6 p.m., Monday to Friday, but crews will generally work from 7 a.m. to 3:30 p.m. Occasional work may extend beyond these hours based on approval from local officials.

As construction continues, the Sudbury Police Department may modify the traffic management plans based on their judgement and expertise. This includes street closures and traffic detours to ensure public safety. 

Please use caution when approaching active work areas to minimize risks to personal safety and to avoid interfering with construction. Final restoration activities will occur when the project is complete.

Hudson

In the inactive MBTA rail corridor from Wilkins Street to Bridge 130, crews are grading the limits of work for the next several weeks. Between Bridge 130 and Main Street, the installation of another cable vault (MH8) north of Main Street will start soon. Cable vaults, often also called manholes (MH), are access points that are used for underground public utilities, allowing inspection and maintenance. From Main Street to Parmenter Road, work crews are currently installing a cable vault (MH10) south of Main Street. Between Parmenter Road and White Pond Road, two cable vaults (MH12 and MH13) were successful completed in the last several weeks. Going forward, between MH12 and MH13, crews will be excavating trenches, installing a protective tube called conduit, which will eventually house the transmission line, and backfilling the trench. Work in this area is where most of the construction is happening for the coming weeks. View the project map for additional details on the locations of work crews.

Approved construction work hours are 7 a.m. to 6 p.m., Monday to Friday, but crews are working from 7 a.m. to 3:30 p.m. Occasional work may extend beyond these hours based on approval from local officials.

Off Forest Avenue, on Hudson Light & Power a crew recently installed a small hand hole that will be used to access the new transmission line. Active construction will NOT occur on Forest Avenue until Spring 2023.. As construction continues, the Hudson Police Department may modify the traffic management plans based on their judgment and expertise. This includes street closures and traffic detours to ensure public safety.

Please exercise caution when approaching active work areas to minimize risks to personal safety and to avoid interfering with construction. Final restoration activities will occur when the project is complete.

Stow

Construction activities are not expected to begin in Stow in the coming weeks.

Marlborough

Construction activities are not expected to begin in Marlborough in the coming weeks.

Siting and Environmental Notification Form Review

The EFSB Petition Filing is part of the siting regulatory review process for an electric transmission line project. On December 17, 2019, Eversource received approval from the EFSB to construct the Sudbury to Hudson Reliability Project. The Massachusetts Supreme Judicial Court upheld the decision on June 25, 2021.

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.

Community Outreach

We will maintain an active field outreach presence during construction in case members of the public have questions.

Have Questions?

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

For more information about this project, please call the project information hotline at 1-833-836-0302 or email ProjectInfoMA@eversource.com.