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| Merrimack Station | |
|---|---|
| Name | Merrimack Station |
| Country | United States |
| Location | Merrimack, New Hampshire |
| Status | Decommissioned (united phases) |
| Owner | Public Service Company of New Hampshire; later Granite Shore Power |
| Primary fuel | Coal; oil; natural gas |
| Units decommissioned | Multiple units (steam turbines and gas turbines) |
| Commissioned | 1960s–1970s |
| Decommissioned | 2016–2019 (staged) |
| Electrical capacity | Formerly ~190 MW (nameplate varied by unit) |
Merrimack Station
Merrimack Station was a fossil-fuel–fired thermal power complex in Merrimack, New Hampshire, constructed in the mid-20th century and operated by regional utilities through the late 2010s. The plant played a role in New England electricity supply, environmental regulation debates, and local labor and land-use decisions, interacting with entities such as Public Service Company of New Hampshire, Eversource Energy, Exelon Corporation, and regional regulators including the New Hampshire Public Utilities Commission. Over its operational life Merrimack Station was involved with fuel markets tied to the Appalachian Basin, transmission networks connected to ISO New England, and environmental policy frameworks influenced by the Clean Air Act and Environmental Protection Agency rulemakings.
Construction began during an era of expansion in the 1960s and 1970s when utilities such as Public Service Company of New Hampshire and developers responded to demand growth after World War II and during the Interstate Highway System era. The facility initially burned oil and coal, reflecting national fuel patterns tied to the Oil Crisis of 1973 and the evolution of coal mining and natural gas supply chains. Ownership and operational control shifted through corporate transactions involving regional firms analogous to moves by NSTAR Electric and National Grid plc in New England energy markets. Regulatory developments stemming from the Clean Air Act Amendments of 1990 and state permitting processes led to retrofits, emissions controls, and debates with organizations such as the New Hampshire Department of Environmental Services and environmental NGOs including Sierra Club and local citizen groups. Economic and competitive pressures from wholesale market reforms implemented by Federal Energy Regulatory Commission policies and the advent of natural gas pipeline expansions contributed to decisions to curtail and ultimately retire generating units in phased decommissioning during the 2010s.
Situated on the banks of the Merrimack River in southern New Hampshire, the complex occupied industrially zoned land near transportation corridors including Interstate 93, local rail lines once operated by carriers like Boston and Maine Railroad, and coastal shipping routes connected to Port of Boston logistics. The site comprised multiple steam turbine units, auxiliary buildings, fuel storage tanks, and switchyards tied into high-voltage lines managed by ISO New England and regional transmission owners similar to Eversource Energy. Nearby municipalities such as Nashua, New Hampshire and Manchester, New Hampshire and institutions including Southern New Hampshire University factored into land-use planning, municipal tax assessments, and workforce availability. The plant's infrastructure included water intakes and cooling systems drawing from the Merrimack River regulated under state water-quality statutes enforced by the New Hampshire Department of Environmental Services.
Merrimack Station used conventional steam-generation technology with boilers fired by coal and oil in earlier decades, later converting or supplementing with natural gas and peaking gas turbines as market conditions shifted. The generating equipment reflected designs produced by manufacturers such as General Electric, Westinghouse Electric Corporation, and turbine auxiliaries analogous to those used at contemporaneous plants like Seabrook Station and Schiller Station. Emissions-control retrofits included selective catalytic reduction and particulate control technologies that paralleled installations at facilities responding to EPA standards and state implementation plans under the Clean Air Act. Grid integration required coordination with regional dispatchers at ISO New England and compliance with reliability standards promulgated by the North American Electric Reliability Corporation.
Operations resulted in emissions of criteria pollutants and greenhouse gases, contributing to conversations about air pollution, acid rain, and regional haze issues addressed by interstate compacts and New England Governors and Eastern Canadian Premiers collaborations. The plant's legacy included monitoring and mitigation efforts related to sulfur dioxide, nitrogen oxides, particulate matter, and carbon dioxide, with oversight from the Environmental Protection Agency and the New Hampshire Department of Environmental Services. Fish and aquatic habitat impacts associated with once-through cooling systems drew attention from conservation organizations such as The Nature Conservancy and state fisheries agencies managing stocks of species in the Merrimack River. Community-led activism and litigation involved environmental groups including the Sierra Club and regional public-interest law firms that engaged permitting authorities and utilities over compliance and remediation.
Throughout its operation the plant experienced equipment failures, regulatory notices, and at least one high-profile incident prompting state inspections and federal reporting under frameworks like the Occupational Safety and Health Administration standards and EPA compliance protocols. Decommissioning proceeded in stages as older units were retired amid economic pressures from low natural gas prices and competition from renewable energy sources such as offshore wind and solar power installations in New England. Site closure involved asset transfers, demolition planning, asbestos abatement consistent with OSHA regulations, and remediation overseen by state environmental authorities and developers experienced in brownfield redevelopment.
The station provided jobs for plant operators, engineers, and contractors tied to unions and training programs similar to those of the International Brotherhood of Electrical Workers and local trade schools. Tax revenues and utility payments influenced municipal budgets for towns like Merrimack and nearby Nashua, New Hampshire, while decommissioning raised questions about property-tax base replacement, workforce transition, and retraining opportunities coordinated with agencies like the New Hampshire Department of Labor. Community stakeholders including chambers of commerce, local school districts, and nonprofit service providers engaged in planning for post-closure economic diversification, reflecting strategies used in other former industrial communities such as Lowell, Massachusetts and Lawrence, Massachusetts.
Redevelopment proposals for the site considered mixed-use, industrial, and energy-focused alternatives, drawing interest from developers, utilities, and municipal planners referencing precedents like the redevelopment of Battery Park City and port-adjacent transformations at the South Boston Waterfront. Proposals evaluated grid-supportive projects such as battery storage, peaking plants, and grid interconnection upgrades under oversight by the New Hampshire Site Evaluation Committee and regional planning bodies. Regulatory approvals, community input, and market conditions will shape outcomes in coordination with entities such as ISO New England, state agencies, private developers, and conservation organizations aiming to balance economic redevelopment with environmental restoration.
Category:Energy infrastructure in New Hampshire