Flatiron Energy (“Flatiron” or “the Company”) announced today the groundbreaking of its Energizar Energy Storage Project (“Energizar”), a 250 MW / 1,200 MWh battery energy storage facility located in Chelsea, Massachusetts. The milestone was marked by a groundbreaking ceremony attended by Lieutenant Governor Kim Driscoll, state and local officials, community and project partners, and construction and labor representatives.

Upon completion, Energizar is expected to be the largest BESS facility in the Northeast and one of the largest urban BESS facilities globally. The project will provide critical energy storage capacity to the Greater Boston region, storing electricity during periods of lower demand and delivering power when it is needed most. By providing affordable, flexible capacity and peak-demand resources, Energizar will help strengthen grid reliability and resilience while supporting Massachusetts’ broader affordability goals.

“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,” said Lieutenant Governor Kim Driscoll. “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.”

“Battery storage is boosting our grid’s reliability and lowering energy bills. The Energizar project shows our first-ever storage procurement is delivering real results,” said Rebecca Tepper, Massachusetts Secretary of Energy and Environmental Affairs. “This project is also a model for strong community engagement. Developers, city officials, and community groups came together to ensure there would be robust investment in local jobs and workforce development, while providing vital power to the grid.”

Today’s groundbreaking follows Flatiron’s recent announcement that it secured approximately $850 million in construction and term financing commitments from leading financial institutions to support the development of Energizar. The financing spans across construction and bridge loan facilities, term loan facilities, letter of credit facilities, a preferred equity commitment, and a tax credit transfer commitment.

“Breaking ground on Energizar represents a major milestone for Flatiron and Massachusetts – and is the culmination of years of planning, collaboration and hard work,” said Jon Poor, Flatiron’s Chief Operating Officer. “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.”

Construction of Energizar is being led by Consigli Construction Co., Inc., with Flatiron working closely alongside the City of Chelsea, local stakeholders and community partners throughout the project’s development. The battery energy storage asset is expected to reach commercial operation in Q4 2027 and will play an important role in meeting the region’s evolving energy needs.

Over the life of the project, Flatiron will make significant investments to the City’s Green New Economy Program, which the city will direct with local and regional partners toward workforce development, community development, youth development and community empowerment. Flatiron is also working to connect Chelsea residents with construction jobs, including through the Chelsea Trade Union Summit hosted earlier this year with the City, La Colaborativa and Greater Boston trade unions; and providing ongoing emergency response training to the Chelsea Fire Department.

“Today’s groundbreaking demonstrates what Chelsea can accomplish through strong collaboration between the public and private sectors,” said Fidel Maltez, City Manager of Chelsea. “Energizar represents a significant investment in our city, bringing new economic opportunities and resources to our community while supporting the region’s long-term energy needs. We appreciate Flatiron’s continued engagement with the City and our residents throughout the development process.”

“Energizar will create meaningful opportunities for the people who call this community home,” said Gladys Vega, CEO of La Colaborativa. “We’re encouraged by the commitment to connecting local residents with workforce development, training and career opportunities as this project moves forward. By ensuring our community has a role in the clean energy transition, we can help build a stronger and more inclusive economic future for Chelsea families.”

“As we work toward a cleaner energy future, it’s essential that communities like Chelsea are part of the conversation,” said Roseann Bongiovanni, Executive Director of GreenRoots. “Projects like Energizar present an opportunity to advance cleaner energy solutions while prioritizing meaningful community engagement and long-term benefits for local residents. We look forward to continued collaboration to ensure Chelsea’s needs remain at the forefront as the project progresses.”

About Flatiron

Flatiron Energy provides safe and reliable energy solutions to improve grid reliability, reduce ratepayer costs, and support communities as energy demand grows. We develop, own, and operate utility-scale energy storage projects that strengthen the electric grid and provide clean capacity where it is needed most. Flatiron’s team leverages multiple decades of deep expertise in energy storage development, structuring, and asset optimization and we are guided by our mission to have a positive impact on the local communities we reach. To learn more, please visit: https://flatiron.energy/.

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