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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.

Community Meetings

Two community meetings have been scheduled to present construction overviews:

Wednesday, May 1, 2019
Newington Town Hall
205 Nimble Hill Road
Newington, NH 03801
Drop in between 6 - 8 p.m.

Wednesday, May 8, 2019
Oyster River High School Cafeteria
55 Coe Drive
Durham, NH 03824
Drop in between 6 - 8 p.m.

Project Facts:

  • 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

Next Steps (subject to change):

  • 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 activities are currently in progress, including the flagging of the edge of the right of way (power line corridor) and wetlands, stone wall documentation, road surveys and the staking of structure locations.
  • We anticipate that construction will begin in May 2019, including work to upgrade Madbury Substation on Miles Lane. This work involves replacing and installing equipment within the existing fence. We expect to complete the work at Madbury Substation and restore areas disturbed during construction by the end of 2019.
  • More information about line work will be available soon. 
  • Survey activities are currently in progress, including the flagging of the edge of the right of way (power line corridor) and wetlands, stone wall documentation, road surveys and the staking of structure locations.
  • We anticipate that construction will begin in May 2019. More information will be available soon. 
  • We anticipate that construction will begin in May 2019. More information will be available soon. 
  • We anticipate that construction will begin in 2019. More information will be available soon. 
  • Survey activities are currently in progress, including the flagging of the edge of the right of way (power line corridor) and wetlands, stone wall documentation, road surveys and the staking of structure locations.
  • We anticipate that construction will begin in May 2019. More information will be available soon. 
  • Survey activities are currently in progress, including the flagging of the edge of the right of way (power line corridor) and wetlands, stone wall documentation, road surveys and the staking of structure locations.
  • We anticipate that construction will begin in May 2019, including work to upgrade Portsmouth Substation on Gosling Road. This work involves replacing and installing equipment within the existing fence. We expect to complete the work at Portsmouth Substation and restore areas disturbed during construction by June 2020.
  • More information about line work will be available soon.

Contact Information

If you have questions or concerns about the Seacoast Reliability Project, please send an email to NHProjectsInfo@eversource.com or call 888-926-5334.