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Our Facilities
Granite Shore Power’s generating assets are comprised of Schiller Station in Portsmouth, Merrimack Station in Bow, Newington Station in Newington and five combustion turbines located in Portsmouth, Bow, Tamworth and Northumberland. Granite Shore Power’s generating capacity is more than 1 gigawatt, that’s enough electricity to power more than 275,000 homes, over half of all the homes in New Hampshire.
The transition of our coal-fired plants to clean energy facilities will meet the changing needs of the region. These facilities will pave the way for the Granite State to be a leader in the clean energy economy.
Schiller Station
Schiller Station in Portsmouth, New Hampshire is home to three thermal steam generating units, two fueled by coal or oil and one fueled by coal or biomass, collectively generating approximately 150 megawatts. The 80-acre site is situated on the deep-water shipping channel of the Piscataqua River with on-site railway access and only 1.5 miles to major transportation infrastructure, including US Interstate 95 and Pease trade-port and international airport. The facility is located with interconnecting high-yard infrastructure to the 115kV transmission system. GSP voluntarily set a firm date of December 2025 to cease coal-fired boiler operations and announced a repowering for the approximate 150-megawatt existing interconnection to a battery energy storage system (BESS).
With more than 5,000 feet of river front access to the Piscataqua River and a deep-water port berthing, the site is an ideal location for further redevelopment for energy sectors requiring significant coastal infrastructure for manufacturing, construction, marshalling and operations and maintenance.
Merrimack Station
Merrimack Station in Bow, New Hampshire is an essential seasonal generating resource within ISO-New England, providing 438 megawatts of reliable electricity to the families and businesses of New Hampshire when needed most. Merrimack Station is the last operating coal-fired power station in New England. GSP voluntarily set a firm date of June 2028 to cease coal-fired boiler operations and announced a redevelopment of the 400-acre site located along the Merrimack River and in proximity to major energy infrastructure into a first-of-its-kind “Clean Energy Park” serving the energy needs of New Hampshire for generations to come.
The site is located with interconnecting high-yard infrastructure to the 115kV transmission system. GSP’s first clean energy project at Merrimack Station is a 120-megawatt combined solar and battery energy storage system (BESS).
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Newington Station
Newington Station in Newington, New Hampshire is a fuel-diverse generating resource with significant fuel storage capacity providing 400 megawatts of critical electric generating reliability.
Newington Stations fuel flexibility makes the generating station ideal to provide the region reliability as ISO-New England transitions to intermittent renewable solar and wind generating resources.