US-based contractor Consigli Construction has started the construction of the Energizar Energy Storage Project in Chelsea, Massachusetts.
The battery energy storage system (BESS) facility, developed by Flatiron Energy, is designed to deliver 250MW of capacity and store up to 1.2GWh of electricity.
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The groundbreaking ceremony for the Energizar project was attended by state and local officials, including Lieutenant Governor Kim Driscoll, alongside representatives from the project team, the construction sector and community organisations.
Consigli Construction was selected as lead contractor for the project and is working in close coordination with the City of Chelsea, Flatiron Energy, and various community stakeholders throughout the build.
The facility has been designed to enhance the stability of the Greater Boston electricity grid by storing power during off-peak hours and supplying it when demand is highest.
Construction is scheduled to progress through to the fourth quarter of 2027, when the facility is expected to begin commercial operation.
Driscoll said: “Projects like Energizar are helping us build a more reliable and affordable energy future. Having the ability to store energy and use it when demand is high will help keep the lights on, lower bills, strengthen our electric grid, and better serve families and businesses across the Greater Boston region.
“This is an important investment in our energy future and another step toward making sure Massachusetts has the reliable power it needs to grow and thrive.”
To support the delivery of the Energizar project, approximately $850m in construction and term financing commitments were secured by Flatiron Energy from several financial institutions.
The financing includes a mix of construction and bridge loans, term loan facilities, as well as tax credit and equity commitments.
The project also includes measures to involve Chelsea residents in construction opportunities and workforce development, as well as ongoing emergency response training with local agencies.
Flatiron chief operating officer Jon Poor said: “Breaking ground on Energizar represents a major milestone for Flatiron and Massachusetts – and is the culmination of years of planning, collaboration and hard work.
“We’re grateful for the strong state and local support we’ve received throughout this process and excited to move into the next phase of construction as we work to bring this critical energy infrastructure online.”
