Sudbury to Hudson Transmission Reliability Project
Eversource is constructing 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 is being constructed between the Eversource substation in Sudbury, and the Hudson Light and Power substation in Hudson. Sign up here 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 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 coordination of projects has been designed to avoid and minimize impacts to environmental resource areas while leaving behind a key recreational asset.
* View the interactive project map
Project Facts (approved underground route):
- Route length: 9 miles
- Line location: Hudson, Marlborough, Stow and Sudbury, Mass.
- Line voltage: 115,000-volt (115-kV) transmission line
- Siting review: Massachusetts Energy Facilities Siting Board (EFSB)
- 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
Estimated Timetable (subject to change):
- Start of construction: Q4 2022
- Projected in-service date: Q4 2023
MASSACHUSETTS ENERGY FACILITIES SITING BOARD (EFSB)
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.
MASSACHUSETTS ENVIRONMENTAL POLICY ACT (MEPA)
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.
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.
Eversource, 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), Eversource asks 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.
Eversource is committed to keeping neighbors, businesses and community members informed on project activities during construction. Sign up to receive email updates. Below are the most recent construction update messages.
Please be assured that this work will not interrupt your electrical service.
Off Boston Post Road, at the Eversource Sudbury Substation, G. Greene Construction is making upgrades to electrical equipment inside the Substation. Construction activities for this portion of the Project are within the fence line, on Eversource property and will be completed in 2023. There will be no work at the Sudbury Substation on November 24.
Initial vegetation clearing is expected to happen in early December, 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. There will be no work on November 24 in the corridor.
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.
Vegetation clearing in the inactive MBTA rail corridor, starting at White Pond Road and moving west towards Wilkins Street is expected to be completed in the coming weeks. Erosion controls will also be installed, beginning at White Pond Road, working towards Sudbury. The removal of rails and ties will start in Hudson in early December. 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.. There will be no work on November 24 in the corridor.
Off Forest Avenue, one crew is installing the first vault (MH1) and duct bank on Hudson Light & Power (49 Forest Avenue) property. Construction on Forest Avenue will not commence until Spring 2023. As construction continues, the Hudson 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. There will be no work on November 24.
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.
Crews have completed installing sediment and erosion controls in Stow. Clearing of vegetation will begin over the next few weeks.
Construction activities are not expected to begin in Marlborough in the coming weeks.
Eversource will maintain an active field outreach presence during construction in case members of the public have questions.
For more information about the Sudbury to Hudson Transmission Reliability Project, send an email to ProjectInfoMA@eversource.com or call 833-836-0302.