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Fossil Fuel Power Plants

Our New Hampshire based fossil fuel power plants play a key role in the production of economic and reliable electricity for our customers.

Using diverse fuel sources to generate power allows us to take advantage of the best fuel prices available and keep energy costs lower for our customers.

Merrimack Station, Bow, NH

Has a rated output of 439 MW and is capable of burning coal. It produces enough energy to supply 190,000 New Hampshire households, and employs about 100 people.

Guided by state and federal clean power laws, Eversource and its customers have invested in environmental initiatives to reduce emissions at Merrimack Station.

The plant today meets or exceeds all environmental regulations; and is one of the cleanest coal-fired power plants in the nation.

Compliance data and information about the station's landfill is available on

Newington Station, Newington, NH

Has a rated output of 400 MW and is capable of ramping up quickly and burning both low-sulfur fuel oil or natural gas. Having two types of fuel to burn offers several advantages.

When natural gas prices are high (or unavailable), oil can be burned. The converse is also true. Eversource can burn oil or natural gas alone, or a use a combination of the two. This flexibility keeps operating costs and electric rates low, and ensures transmission system reliability.

Over the last two decades, Newington Station has been modified to improve air quality. Large electrostatic precipitators were originally installed to remove ash particles.

Additionally, using various combustion process methods, the amount of nitrogen oxide emitted by Newington Station has been reduced by more than 50 percent since 1992. Systems have also been added to improve fly ash removal to further improve particulate capture.

Schiller Station, Portsmouth, NH

Has a rated output of 150 MW and is capable of burning coal, oil or wood chips (learn more about this award-winning power generation facility, which is called Northern Wood Power).

Schiller Station has undergone millions of dollars in environmental optimizations over the years, including the installation of electrostatic precipitators (to remove ash particles) and Selective Non-Catalytic Reduction equipment (to reduce nitrogen oxide emissions).

Peaking Units

Our fleet also includes five “peaking units” that are designed to burn jet fuel and natural gas. These units contribute to regional reliability and operate in times of high demand and when needed for transmission system reliability.

Nominally rated at approximately 20 megawatts each, these New Hampshire units are located in Bow (2 units), Groveton, Tamworth, and Portsmouth