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 was constructed between the Eversource substation in Sudbury, and the Hudson Light and Power substation in Hudson. The new transmission line was energized in December, 2024. Construction was completed November 2024 and restoration will be finalized in 2025. 

The approved route included 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 was built under streets in Hudson. 

We are working closely with the Massachusetts Department of Conservation and Recreation (DCR) to co-locate compatible uses within the existing, inactive MBTA corridor. We conducted the civil work and bridge replacement to prepare the site, installed the new transmission line and left a compacted gravel sub-base to support the Massachusetts Central Rail Trail (MCRT). DCR will pave the trail, install safe road crossings and complete final restoration of this publicly accessible shared-use path. Construction on the shared-use path will be completed in 2025.

* 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.

• Sudbury Traffic Management Plans
• Hudson Traffic Management Plans

Construction Updates

We're committed to keeping neighbors, businesses and community members informed on project activities. This work will not interrupt your electrical service. 

We placed the transmission line in-service before the end of 2024. This concluded our portion of the work in the corridor outside of targeted restoration efforts, which will occur over the coming weeks. 

From there, we will turn over work in the inactive MBTA corridor to the Massachusetts Department of Conservation and Recreation (DCR) in 2025 who are in the process of installing the new shared use rail trail.

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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, we 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. Our filing is docket number EFSB17-02.

On May 15, 2017, we 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, we 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.