Salt Cod Storage

Energy Storage Facility |  Somerset, Massachusetts

The Salt Cod Storage facility will use safe, reliable energy storage technology deployed by Flatiron Energy to ensure power is delivered to local homes and businesses during peak demand periods.

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Worker in hard hat pointing toward electrical transmission towers.
Aisle of battery storage cabinets.
Project Overview

Salt Cod Storage is a battery energy storage system currently in the early stages of development by Flatiron Energy in Somerset, Massachusetts. When completed, Salt Cod Storage will store up to 672 megawatt-hours (MWh) of energy and provide reliable electricity to local homes and businesses during peak demand. The facility is scheduled to commence operations in December 2028.

Power capacity — 168 MW

This is the system’s maximum power
output at any given time.

1 megawatt (MW) = 1,000,000 watts.

Real-world example:

168 MW of power would light up 1.68 million 100-watt light bulbs.

Energy capacity — 672 MWh

This is the maximum amount of energy
the system can store.

1 MW of power sustained for an hour = 1 MWh.

Real-world example:

672 MWh is enough energy to power around 33,600 Massachusetts households for one month.

Source: U.S. Energy Information Administration: “How much electricity does an American home use?”, 2024

Project Renderings
Community Impact

Community Benefits

Salt Cod Storage will deliver significant environmental, economic, and infrastructure benefits to the Town of Somerset and the broader Bristol County region throughout the project’s development, construction, and operation. During construction, the project is expected to generate more than $14 million in new local earnings, create approximately 110 local jobs, and contribute millions of dollars in property tax revenue to local taxing districts over its lifetime. In addition, the project will establish a Host Community Agreement with the Town of Somerset to ensure sustained, long-term community benefits.

People walking along a small-town main street with shops and flags.

Environmental impact

Battery storage is essential to strengthening grid reliability. Salt Cod Storage will store and distribute energy generated from solar, wind, and other resources, ensuring it is available when demand is highest. This reduces reliance on polluting fossil-fuel generators, lowers carbon emissions, and improves overall air quality.

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The finished project site will feature trees and other landscape improvements and will operate as a non-emitting, non-polluting energy resource. Noise-mitigation measures, including roof parapets, will be implemented to minimize potential impacts on nearby residents.

Tree-lined residential street with sidewalk and landscaping.

Community resilience

Energy storage benefits residents by improving the reliability of the power grid. Batteries provide safe, reliable energy to residents, reducing the risk of blackouts and the need for more expensive energy generation.

Utility worker in safety vest using a tablet near power lines.
Why Somerset?
Aerial view of a coastal city with a bridge over the water.

Supporting local reliability and resilience

Sited on the grounds of the former Montaup Power Plant, the 11-acre project site will host self-contained battery units that will connect to the existing National Grid transmission infrastructure along Riverside Avenue. Once operational, the facility will contribute millions to Somerset’s tax base, strengthen New England’s grid reliability, and reduce reliance on expensive imported fossil fuels.

Brick power plant building with people gathered outside.

Reimagining the Montaup
Power Plant

The project helps improve air and water quality by reducing reliance on fossil-fuel generators, supports the replacement of pollutive legacy energy infrastructure, and strengthens grid reliability by adding capacity and upgrading transmission systems to meet growing energy demand.

Battery energy storage system cabinets outside.
Energy Storage Explained

Battery energy storage systems

Battery energy storage systems (BESS) provide reliable energy by holding surplus energy for use when demand increases. The result is cleaner air, reduced pollution, and more affordable energy. Salt Cod Storage will be a critical step toward helping Massachusetts achieve its goals of procuring 5,000MW of BESS by 2030 and reaching net-zero emissions by 2050.

Battery energy storage system cabinets.
1

Aligning energy demand with renewable supply

Renewable energy sources such as solar and wind generate electricity intermittently, and energy demand often does not align with peak renewable production. Battery storage helps balance this mismatch by absorbing excess generation.

Solar farm with rows of solar panels.
2

Saving energy for when it’s needed most

Batteries capture and store energy from renewable and other sources for later use. Without storage, excess clean energy that is not immediately consumed would otherwise be lost.

Green illuminated battery graphic.
3

Reliable energy when demand peaks

During periods of peak demand, batteries discharge stored energy back into the grid, helping prevent blackouts, reduce grid instability, and lower peak-demand electricity pricing. Battery systems also provide essential grid services throughout the day, improving overall system reliability and resilience.

Residential neighborhood at night with lit homes.

Massachusetts Clean Energy and Climate Plan for 2050

Construction Schedule

Q1 2026

Project permitting

Ongoing

Annual performance reviews

Q2 2027

Construction commences

Q4 2028

Target operations date

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Contact

As a certified B Corporation, we deeply value the input of our community.

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