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Seacoast Reliability Project

To help ensure that the New Hampshire Seacoast Region can continue to grow and thrive, Eversource is building the Seacoast Reliability Project, a new transmission line connecting two existing substations.

The project includes a new 115-kilovolt (kV) transmission line extending approximately 13 miles between substations in Madbury and Portsmouth, N.H., along with associated substation upgrades. 

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Once complete, the project will help improve the transmission system in the Seacoast area so that our customers will have reliable electric power to meet their current and growing energy needs. It will also ensure that the area's electric grid conforms to national and regional reliability standards.

Eversource will invest more than $84 million in New Hampshire to bolster the regional infrastructure. Though the project will result in direct benefits for New Hampshire communities, residents and businesses ― including the enhanced system reliability for customers, creation of local jobs, and property tax payments in host communities ― the cost of the project will be paid by all electric customers in New England.

See the one-page Seacoast Reliability Project information sheet for more details. 

New Hampshire Site Evaluation Committee

For an electric transmission line project, such as the Seacoast Reliability Project, the New Hampshire Site Evaluation Committee (SEC) Application Filing is 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 follows a series of public information sessions and public hearings in Concord and in the communities that will host the new 115-kV transmission line.

Click here for Post-Certificate Filings for the project, including reports for and from the Department of Environmental Services (NHDES).

Project Timeline:

  • Application filing with the SEC: April 12, 2016
  • SEC verbal decision to approve the project with conditions: December 10, 2018
  • SEC written order and conditions of approval: January 31, 2019
  • Start of construction: May 2019
  • Project completion: Second Quarter 2020

Construction Updates

Eversource is committed to updating and proactively communicating with neighbors, businesses and all community members about project activities and will continue this outreach throughout the construction process. A dedicated outreach team will provide notifications prior to the start of work and perform onsite meetings by request.

The sections below also feature construction updates for each town.

All dates are in 2019 unless otherwise noted. 

  • Survey of power line corridor, stone walls and roadways:
    • Stakes will need to be replaced periodically.
    • Environmental surveys will be performed throughout the corridor prior to tree-clearing and construction activities.

  • EMF readings: 
    • Pre-construction EMF readings: Complete
    • Post-construction EMF readings: June 2020

  • Tree clearing: Complete

  • Madbury Substation construction: May - November

  • Overhead line construction from Madbury Substation to UNH: October - December

  • Restoration of power line corridor: Spring 2020 - Summer 2020
  • Survey of power line corridor, stone walls and roadways: 
    • Stakes will need to be replaced periodically.
    • Environmental surveys will be performed throughout the corridor prior to tree-clearing and construction activities.

  • EMF readings:
    • Pre-construction EMF readings: Complete
    • Post-construction EMF readings: June 2020
  • Eversource Cable House relocation (at 295 Durham Point Road): July 2019 - August 2020
    • Relocation to temporary location (during construction): Complete
    • Relocation to permanent location (after construction): August 2020
  • Tree clearing: Complete
  •  Overhead line construction:
    • UNH to Route 108: September - December
    • Longmarsh Road, Timberbrook Lane, Cutts Road, Ffrost Drive, Sandy Brook Drive, Durham Point Road: December 2019 - January 2020

  • Restoration of power line corridor: Spring 2020 - Summer 2020
  • Tree clearing: Complete

  • UNH duct bank (underground) construction: Complete

  • UNH underground cable installation: December 2019 - January 2020
  • Overhead line construction:
    • Mill Road: August - October
    • Route 4 to UNH campus: October - December
    • Foss Farm Road, Bennett Road: October - December
  • Jet-plow trial run: Complete

  • Existing cable removal: Complete

  • Jet-plow cable burial: October - November

  • Hand-jetting in Little Bay: October - November

  • Trench backfill after cable installation at shorelines: November

  • Concrete mattress installations: November

To learn more, see the Little Bay information sheet

  • Survey of power line corridor, stone walls and roadways:
    • Stakes will need to be replaced periodically.
    • Environmental surveys will be performed throughout the corridor prior to tree-clearing and construction activities.

  • EMF readings:
    • Pre-construction EMF readings: Complete
    • Post-construction EMF readings: June 2020

  • Tree clearing: Complete

  • Overhead line construction: August - November
    • Includes: Little Bay Road, Fox Point Road, the Crossings at Fox Run, Spaulding Turnpike, Woodbury Avenue, Gosling Road

  • Underground line construction (includes testing): 
    • Gundalow Landing, Flynn Pit: August - November
    • Frink Farm, Hannah Lane: August 2019 - January 2020

  • Restoration of power line corridor: Spring 2020 - Summer 2020
  • Survey of power line corridor, stone walls and roadways:
    • Stakes will need to be replaced periodically.
    • Environmental surveys will be performed throughout the corridor prior to tree-clearing and construction activities. 
  • EMF readings:
    • Pre-construction EMF readings: Complete
    • Post-construction EMF readings: June 2020

  • Tree clearing: Complete 
  • Portsmouth Substation construction: May - Early 2020

  • Overhead line construction: September - November

  • Restoration of power-line corridor: Spring 2020 - Summer 2020




Project Outreach

We are committed to being a good neighbor and keeping you informed about our work. Throughout the project, we will continue working directly with the community to provide information about construction and to quickly answer any questions or concerns. Some of the ways that we’ll communicate with residents, businesses and others in the community include:

Project Information Letters: Letters mailed to property owners along the right of way (power line corridor), sharing project milestone information.

Public Open Houses: Information sessions held prior to the start of construction.

Field Outreach Representatives: Eversource representatives who are on-site prior to, and during, construction. They communicate with local residents and businesses in-person about the project, and respond to any questions or concerns.

Project Webpage: Route maps, project schedules, regulatory filings, regular town-by-town construction updates and contact information.

Municipal Meetings: Project update meetings with city and town officials held regularly throughout various phases of project construction.

Contact Us

For any questions or concerns about the Seacoast Reliability Project, please call us at 888-926-5334, email us at NHProjectsInfo@eversource.com, or discuss directly with the Eversource Field Outreach Representative. We will make every effort to promptly respond to your questions or address your concerns.

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. That process can be found here (see pages 212-218).