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Somersworth transforms Superfund site into innovative solar power plant

Somersworth partners with Ameresco to develop the first solar power plant on a Superfund site in New Hampshire, generating 67 million kWh over 20 years and reducing CO2 emissions.
Superfund solar power plant

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The town of Somersworth, in partnership with Ameresco Inc. is launching a first-of-its-kind solar project on the formerly contaminated Somersworth Landfill site. This initiative marks a first in New Hampshire, with the installation of a photovoltaic power plant on a Superfund site.
The project, with a capacity of 2,577 kW-DC, is set to produce 67 million kWh over the next two decades, representing a significant step towards reducing CO2 emissions.
This annual production will reduce the region’s carbon footprint by avoiding the emission of 2,461 metric tons of carbon dioxide, equivalent to the energy consumption of 486 homes.

An exemplary collaboration for a sustainable project

The success of this operation is based on close cooperation between several players.
Ameresco, a specialist in renewable energy technologies, worked hand in hand with the municipality of Somersworth and the regulators, including the U.S. Environmental Protection Agency (EPA) and the New Hampshire Department of Environmental Services (NH DES).
Obtaining the necessary approvals was an essential milestone, enabling work to begin as early as August 2024.
The project’s financing model is based on the state’s group net metering program, which allows the town to benefit from the energy produced while generating additional revenue through a land lease and payments in lieu of taxes (PILOT).

Implications and future of contaminated site use

This project illustrates the strategic use of contaminated land to meet growing energy needs, while contributing to the energy transition.
By redeveloping the Somersworth Landfill, the city is demonstrating that it is possible to transform environmental liabilities into productive assets, while complying with the strict environmental standards imposed by regulators.
This model could inspire other municipalities in the United States to consider similar solutions for Superfund sites, reinforcing the resilience and sustainability of energy infrastructures.
Somersworth’s initiative highlights the importance of public-private partnerships in the realization of large-scale projects, particularly those requiring technological innovation and rigorous resource management.
By contributing its expertise, Ameresco is helping to move the energy industry towards a cleaner future, while making efficient use of previously under-utilized sites.

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