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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.

  • Survey of power line corridor, stone walls, roadways, and electric and magnetic frequency (EMF) readings: April - May 2019
  • Madbury Substation: Mobilization (gathering materials and resources in preparation for construction): April; start of construction: May - November 2019
  • Line construction from Madbury Substation to the University of New Hampshire (UNH): October 2019 - early 2020

 

  • Survey of power line corridor, stone walls, roadways, and electric and magnetic frequency (EMF) readings: April - May 2019
  • Mobilization (gathering materials and resources in preparation for construction) and delivering the materials to work areas ("laydown areas") near the power line corridor: May 2019. Mobilization is contingent upon finalized agreements with the Town of Durham.
  • Clearing of access roads and trimming in upland areas: May - October 2019
  • University of New Hampshire (UNH): Mobilization (gathering materials and resources in preparation for construction), tree clearing and construction: May 20, 2019 - early 2020
 
  • Survey of power line corridor, stone walls, roadways and electric and magnetic frequency (EMF) readings: April - May 2019
  • Clearing access roads, trimming upland areas (starting at Mill Road): May - September 2019
  • Mobilization (gathering materials and resources in preparation for construction), tree clearing and underground construction: May 20 - August 2019
  • Overhead construction and tree clearing: May 2019 - early 2020

 

  • Jet plow trial: September 2019
  • Submarine cable installation: September - November 2019
  • Survey of power line corridor, stone walls, roadways, and electric and magnetic frequency (EMF) readings: April - May 2019
  • Clearing of access roads and trimming in upland areas: May - October 2019
  • Mobilization (gathering materials and resources in preparation for construction) and delivering the materials to work areas ("laydown areas") near the power line corridor: May 2019. Mobilization is contingent upon finalized agreements with the Town of Newington.
  • The Crossings at Fox Run Mall parking lot: Drill foundations: May - October 2019
  • Little Bay Road to The Crossings at Fox Run Mall: Drill structure foundations: June - October 2019
  • Little Bay Road to The Crossings at Fox Run Mall: Install structures: June - October 2019
  • Little Bay Road to The Crossings at Fox Run Mall: Install overhead lines: July - October 2019
  • Gundalow Landing, Flynn Pit: Manhole (a precast concrete vault), duct bank (protective tubes to hold power lines) and cable installation: July - September 2019
  • Frink Farm/Hannah Lane: Duct bank (protective tubes to hold power lines) and cable installation: August - November 2019
  • Mall parking lot: Install structures and wire-pulling: September - October 2019
 
  • Survey of power line corridor, stone walls, roadways, and electric and magnetic frequency (EMF) readings: April - May 2019
  • Clearing of access roads and trimming in upland areas: May - October 2019
  • Portsmouth Substation: Mobilization (gathering materials and resources in preparation for construction): April; start of construction: May 2019 - early 2020
  • Overhead transmission line work for the removal of a line feeding into the Portsmouth Substation: May 2019
  • Install structures near Portsmouth Substation in the power line corridor: May - October 2019

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).