Nashua Millyard Substation Rebuild Project

Project Overview

The Nashua Millyard Substation is a distribution substation that serves businesses along Pine Street and parts of downtown. The electrical equipment is now obsolete after almost 70 years in service and the substation is currently being rebuilt.

We worked with city officials over the last several years to complete a land swap, which allows the new substation (distribution 34.5 – 4.16 kilovolt) to be built immediately north of the existing substation.

Many of the existing circuits (wires) entering and exiting the substation will also be rebuilt and/or relocated.

The old substation will be deconstructed when the work is complete and after the new substation is in-service. Once the old substation has been deconstructed, the land will be restored, and the property will be transferred from Eversource to the City of Nashua.

Project Location


The substation (old and new) is located off Technology Way in Nashua, N.H. The associated lines are located along and around Spine Road and Technology Way.

The lines will remain on the east side of the Nashua River within a series of new or updated easements recently secured from private property owners. This line work will happen concurrently with the rebuilding of the substation.

Construction Updates 

Week of November 22, 2021

New substation equipment will continue being delivered and assembled on-site. Most of the civil construction activity will wrap up by the end of November, and as the new equipment is being installed, areas of excavation will be backfilled.

Week of November 29, 2021

The new substation fencing and gates will start being installed, although the larger project area fencing will remain in place throughout construction. Backfilling of excavation areas will also continue into December.

Please remember to stay out of active construction zones and outside of any fenced-in areas.

Commitment to Safety

We take every safety precaution while working in local communities, and all people working on the construction project carry identification. The project work will not interrupt electric service to homes or businesses.

We remain committed to prioritizing public health as well as the health of employees and contractors during COVID-19. All Eversource personnel follow applicable health and safety guidelines to help prevent the spread of COVID-19.

We are committed to updating neighbors, businesses and all community members about project activities, especially during construction. Please keep in mind that the construction schedule may change due to weather or other unexpected circumstances. 

Anticipated Schedule

  • Permitting, Siting, Engineering: Fall 2018 – Summer 2021 (complete)
  • Environmental Clean-Up: May 2021 (complete)
  • Site Preparation Start: September 13, 2021
  • New Substation Construction: September 2021 – June 2022
  • Circuit (Line) Construction: January – May 2022
  • New Substation In-Service Date: July 2022
  • Old Substation Removal: August – September 2022
  • Final Restoration: September 2022

Public Outreach

We're committed to engaging municipal officials, residents, businesses, community groups and other stakeholders about upcoming project activities through municipal briefings, mailings, site meetings, virtual meetings and door-to-door outreach, while adhering to COVID-19 social distancing and other related health and safety guidelines.

We utilize a variety of outreach methods to ensure that all customers and property owners along our transmission lines receive adequate and timely information about our projects. For this Project, we will be sending periodic updates as letters mailed directly to all stakeholders, as well as a combination of the following additional methods:

  • Door-to-door outreach
  • Site visits (upon request)
  • Virtual meetings (upon request)
  • Signage placed strategically near construction areas or in residential areas
  • Regular field presence to ensure the safety of our customers, nearby property owners, and our construction crews

Additional Resources

Project fact sheet

Contact Us 

Keeping the lines of communication open is an important part of our work in your community.

For questions or more information about the project, please contact us at 1-888-926-5334 or