Seacoast Reliability Project

The project was successfully completed and placed in service May 2020

Why Did We Do This Project?

We invested more than $123 million in this New Hampshire project designed to bolster the regional infrastructure.

The project resulted in direct benefits for communities, residents, and businesses ― including the enhanced system reliability for customers, the creation of local jobs, and property tax payments to host communities. It also ensures that the area's electric grid conforms to national and regional reliability standards.

Where Was The Work Done?

The new 13-mile-long, 115-kilovolt (kV) transmission line connects two existing substations in Madbury and Portsmouth.


New Hampshire Site Evaluation Committee 

The New Hampshire Site Evaluation Committee (SEC) Application Filing was part of the siting regulatory review process, as defined by the New Hampshire state statutes.  

On December 10, 2018, the SEC voted unanimously to approve the construction of the project.  

On January 31, 2019, the SEC issued its written order, reaffirming its oral approval. The committee’s approval followed a series of public information sessions and public hearings in Concord and in the communities that host the new 115-kV transmission line. 

You can read the post-certificate filings for the project, including reports for and from the Department of Environmental Services (NHDES). 

Construction Updates 

Construction and a majority of the restoration was completed in 2020, with additional restoration activities completed throughout 2021, where necessary.

Environmental monitoring is also complete, with the exception of monitoring efforts of the buried cable in Little Bay, which must be performed on a yearly basis through 2024, per the project’s state permitting requirements. 

Community Outreach

Although the project is now complete, outreach specialists are still available to answer your questions about this important project.

In the unlikely event that we are unable to address your concerns to your satisfaction, a process has been developed by the New Hampshire Counsel for the Public and Eversource to provide more help with resolving issues (pages 212-218).

Contact Information 

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