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Eversource, National Grid finish $129M, 345-kV power line for New England

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Eversource, National Grid finish $129M, 345-kV power line for New England

Eversource Energy and National Grid USA completed construction of their joint Merrimack Valley Reliability Project, a $129 million transmission line that seeks to improve reliability in southern New Hampshire and the Greater Boston area.

Eversource announced Dec. 6 the completion of the overhead 345-kV transmission line along an existing right of way and its expected start of operations later in the month. The 24.5-mile power line runs from the Scobie Pond substation in Londonderry, N.H., to the state border at Pelham, N.H., before extending to Tewksbury, Mass.

The project was unveiled by Eversource and National Grid at the start of 2015 as a solution to reliability issues identified by regional grid overseer ISO New England in its 2008 Greater Boston Solutions study. The project was selected by ISO New England in February 2015 and given final permitting approvals by Massachusetts and New Hampshire regulators in April 2016 and October 2016, respectively.

In a news release, Eversource New Hampshire President Bill Quinlan said the project was completed under budget and on schedule. Construction began in fall 2016. Eversource was responsible for developing about 10 miles of the line and National Grid, through its subsidiary New England Power Co., for 8 miles

Eversource is known legally in New Hampshire as the Public Service Co. of New Hampshire. National Grid is the U.S. arm of the U.K.'s National Grid plc.