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Why Are We Doing This Project?

As part of our ongoing commitment to deliver reliable energy and superior service to our customers, we are proposing to replace existing 345-kilovolt (kV) high pressure fluid-filled (HPFF) underground transmission lines with new 345-kV cross-linked polyethylene (XLPE) transmission lines. 

The existing underground transmission line was built in 1976 and 1986 and is past its useful life expectancy. Replacing the existing HPFF line with XLPE will modernize the existing transmission system and increase reliability.

The proposed project is part of a larger program we are conducting throughout our service territory in Connecticut and Massachusetts related to underground cable modernization. This program is designed to modernize and increase the capacity of the existing underground transmission cable systems by replacing existing fluid-filled cable with cross-linked polyethylene cable. 

Where Is This Work Being Done?

The transmission line targeted for upgrades as part of this project runs from the North Cambridge substation, near the Alewife MBTA station, to the Woburn substation next to Horn Pond. The transmission line runs through Cambridge, Arlington, Winchester and Woburn. 

We are reviewing possible routes to install the new line, including along the existing route. We welcome and appreciate the opportunity to integrate feedback into the routing.

Once the new line is installed, the existing HPFF transmission line will be retired.

*Click map to enlarge

About this project

• Route length: Approximately 6 miles
• Line voltage: 345 kilovolts (kV)
• Siting review by: Massachusetts Energy Facilities Siting Board (EFSB)
• Public open house: Later 2024 or early 2025

Siting Review

This project requires a petition filed with the Massachusetts EFSB. We intend to submit this petition to the EFSB in 2024. Environmental permits will also be required from state and federal agencies. 

Community Outreach

We're committed to engaging city officials, residents, businesses, community groups and other stakeholders about project activities through municipal briefings, mailings, virtual meetings and door-to-door outreach.

We are committed to providing meaningful opportunities to participate in the project development process, and to incorporate local feedback into the project’s development as feasible.