Seacoast Reliability Project

The Seacoast Reliability Project involves a new 115-kV transmission line to address reliability concerns around the Portsmouth region, NH. The new line will travel approximately 13 miles between the Madbury and Portsmouth substations. The line will be structured to run both above ground and below Little Bay.

Project Sponsor Line Miles Voltage (kV) From State To State Year in Service
Eversource Energy 13 115 NH NH 2020
Estimated Costs ($M) Voltage Type Project Status Project Group Origin Point Destination Point
84 Underground and Aboveground Under Construction Madbury Portsmouth SS
Interstate Build Start NERC ISO/RTO Country Project Partners
No NPCC ISONE US