ISO New England has selected Eversource's Transmission Initiative Down East, or TIDE, as its preferred project to address transmission needs in northern New England, the New England utility said in a statement Wednesday.
The project includes a new 18-mile, 345-kilovolt transmission line in New Hampshire, rebuilding an existing 345-kV line, reconductoring another existing line and installing equipment to regulate voltage and power quality.
Most of the work would be done within existing transmission rights-of-way in New Hampshire, with additional work in Maine and Massachusetts.
Eversource said that according to ISO New England's analysis, the project would add transmission capacity, reduce congestion and allow as much as 1,200 megawatts of future onshore wind generation in northern New England.
ISO-NE estimates the project would produce $1.42 billion in production-cost and congestion savings, $1.30 billion in avoided capital investment and $694 million in avoided transmission investment, Eversource said.
The project still needs engineering, environmental, permitting and regulatory approvals. Construction is expected to begin in 2029.