Project Overview

The North Quincy Cable Project is an underground transmission cable replacement project. The existing cables connect National Grid’s North Quincy Substation and National Grid’s Field Street Substation.

In recent years, National Grid has made numerous repairs to this cable system to enable continued delivery of electricity to our customers. Originally installed in 1973, these cables are nearing the end of their service life and need to be replaced. National Grid plans to replace the existing cables with new, modern cables installed within a concrete duct bank, and manhole system. Replacement of these aging cables will improve electric reliability for our area customers, and minimize maintenance and repair costs, providing the capacity to meet growing electric energy needs.

Throughout the planning phase of this project, National Grid has been working with local officials in Quincy, the Department of Conservation and Recreation, and the Department of Transportation to solicit feedback and maintain an open dialogue about the important infrastructure project. In 2021, we completed construction on a small section of the project route on Newport Avenue Extension. The remainder of our work is expected to begin in the spring of 2022. The new cables are expected to go into service by late 2023. Removal of the existing cables, under our current schedule, is expected to take place in 2024.

Construction Methods

Horizontal Directional Drilling

Open Trench Excavation

Fact Sheet and FAQs

Project Virtual Open House

Project Map

Project Schedule

Spring 2020


Spring 2020

Stakeholder Outreach

Late-Spring 2021

HDD Construction Start

Spring 2022

Construction Start

Winter 2023

New Cables In-Service