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majorprojects

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).

Community Meetings

Community meetings provide an overview of construction. One was held at the Newington Town Hall on May 1, 2019, and one was held at the Oyster River High School in Durham on May 8, 2019.

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
  • Community meetings for construction overview: May 1, 2019, at Newington Town Hall; and May 8, 2019, at the Oyster River High School Cafeteria in Durham. 
  • Start of construction: May 2019
  • Project completion: 2nd 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, roadways, and electric and magnetic frequency (EMF) readings: June - July
  • Madbury Substation construction: May - November 
  • Tree clearing in residential areas: July - August
  • Overhead line construction from Madbury Substation to UNH: October - December

 

  • Survey of power line corridor, stone walls, roadways, and electric and magnetic frequency (EMF) readings: June - July
  • Mobilization (gathering materials and resources in preparation for construction) and delivering the materials to work areas ("laydown areas") near the power line corridor: June. 
  • Clearing of access roads and tree trimming in upland areas: June - August
  • Tree clearing in residential areas: July - August
  • Overhead line construction:
    • UNH to Little Bay: July - December
      • Includes: Foss Farm Road, Bennet Road, Route 108, Longmarsh Road, Timberbrook Lane, Cutts Road, Ffrost Drive, Sandy Brook Drive, Durham Point Road
    • Madbury Substation/Route 4 to UNH: October - December
    • Packers Falls area: Early 2020
      • Includes: Mill Road, Foss Farm Road, Bennett Road
  • UNH underground construction: May - August
 
  • Survey of power line corridor, stone walls, roadways and electric and magnetic frequency (EMF) readings: June - July
  • Clearing access roads and tree trimming in upland areas: June - July
  • UNH underground construction: May - August
  • Overhead line construction:
    • Mill Road area: June - July
    • Route 4 to UNH campus: October - December
    • Packers Falls area: Early 2020
      • Includes: Mill Road, Foss Farm Road, Bennett Road

 

  • Jet plow trial: September 
  • Submarine cable installation: September - November
  • Survey of power line corridor, stone walls, roadways, and electric and magnetic frequency (EMF) readings: June
  • Clearing of access roads and tree trimming in upland areas: June - October 
  • Tree clearing in residential areas: June - October
  • Mobilization (gathering materials and resources in preparation for construction) and delivering the materials to work areas ("laydown areas") near the power line corridor: June. Mobilization is contingent upon finalized agreements with the Town of Newington.
  • Overhead line construction: August - October
    • Includes: Little Bay Road, Fox Point Road, the Crossings at Fox Run, Spaulding Turnpike, Woodbury Avenue, Gosling Road
  • Underground line construction:
    • Gundalow Landing, Flynn Pit: July - October
    • Frink Farm, Hannah Lane: August - November
 
  • Portsmouth Substation construction: May - early 2020
  • Clearing of access roads and tree trimming in upland areas: June - July
  • Tree clearing between Portsmouth Substation and the Crossings at Fox Run: May - October
  • Install structures near Portsmouth Substation in the power line corridor: September - October 

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, weekly town-by-town construction updates and contact information.

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

 

For any questions or concerns, please call us at 1-888-926-5334, 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).