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Sudbury to Hudson 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. 

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 the trail, install safe road crossings and complete final restoration of this publicly accessible shared-use path.


* 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. 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: First quarter 2025

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 electrical service.

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