Published DatePLYMOUTH — Major upgrades to New Hampshire Electric Co-op's (NHEC) Green Street substation ware designed to greatly improve the reliability of electric service to downtown Plymouth and Plymouth State University.
The rebuilt substation, which went online March 14, provides electricity at 12.47 kilovolts (kv) in an area that runs from Route 175 in Holderness north to McDonalds on Route 3 and west to the end of Highland Street where it meets Tenney Mountain Highway. It also serves all of the university's facilities.
Prior to the recent renovations, the Green Street substation provided power at 5 kv and was not connected to other NHEC substations in the area. The refurbished substation has more than doubled that voltage capacity and is now connected to NHEC substations in Bridgewater and Fairgrounds Road in Plymouth. This means that for the first time, NHEC will be able to reroute power to downtown Plymouth in the event of a loss of power to the Green Street substation, or when the substation is de-energized for maintenance. Work scheduled for this summer will also tie NHEC's Rumney substation to the Green Street, Fairgrounds Road and Bridgewater substations.
"The work at Green Street represents a major investment in the reliability of electric service to downtown Plymouth," said James Bakas, NHEC Vice President of Operations and Engineering. "Power outages have an economic impact, particularly in a commercial area like downtown Plymouth, so we're glad to complete this project which should reduce the number and duration of outages there."
Work at the Green Street site included a significant expansion of the substation's footprint and the installation of all new transformers and voltage regulators. Due to the proximity of the substation to the Pemigewasset River, a number of environmental measures were taken, including the construction of a retaining wall on the side that faces the river. Like other NHEC substations, the Green Street facility also has an oil containment system that includes a polypropylene membrane and a 2,000 gallon catch basin beneath the new transformers.
NHEC is a member-owned electric distribution cooperative serving 83,000 homes and businesses in 115 New Hampshire communities.