Flatiron Energy announced the groundbreaking of its Energizar Energy Storage Project, 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.

Strengthening Greater Boston Grid Reliability

Upon completion, Energizar is expected to be the largest battery energy storage system 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.

State Leaders Tout Reliability and Affordability Benefits

Lieutenant Governor Kim Driscoll said projects like Energizar are helping 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," she said, calling the project an important investment in Massachusetts' energy future.

Rebecca Tepper, Massachusetts Secretary of Energy and Environmental Affairs, said battery storage is boosting the grid's reliability and lowering energy bills and that the Energizar project shows the state's first-ever storage procurement is delivering real results.

She also described the project as a model for strong community engagement, noting that developers, city officials, and community groups came together to ensure robust investment in local jobs and workforce development while providing vital power to the grid.

USD 850 Million in Financing Commitments Backs the Project

The groundbreaking follows Flatiron's recent announcement that it secured approximately USD 850 million in construction and term financing commitments from leading financial institutions to support the development of Energizar.

The financing spans construction and bridge loan facilities, term loan facilities, letter of credit facilities, a preferred equity commitment, and a tax credit transfer commitment.

Jon Poor, Flatiron's Chief Operating Officer, said breaking ground on Energizar represents a major milestone for the company and Massachusetts and is the culmination of years of planning, collaboration, and hard work.

He expressed gratitude for the strong state and local support received throughout the process and said the company is excited to move into the next phase of construction as it works to bring the energy infrastructure online.

Construction Timeline and Leadership

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.

Community Investment and Workforce Development Commitments

Over the life of the project, Flatiron will make significant investments in 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 is providing ongoing emergency response training to the Chelsea Fire Department.

Fidel Maltez, City Manager of Chelsea, said the groundbreaking demonstrates what Chelsea can accomplish through strong collaboration between the public and private sectors.

He described Energizar as a significant investment in the city, bringing new economic opportunities and resources to the community while supporting the region's long-term energy needs, and thanked Flatiron for its continued engagement with the City and residents throughout the development process.

Gladys Vega, CEO of La Colaborativa, said Energizar will create meaningful opportunities for the people who call the community home.

She said the organization is encouraged by the commitment to connecting local residents with workforce development, training, and career opportunities as the project moves forward, adding that ensuring the community has a role in the clean energy transition can help build a stronger and more inclusive economic future for Chelsea families.

Roseann Bongiovanni, Executive Director of GreenRoots, said that as the region works toward a cleaner energy future, it is essential that communities like Chelsea are part of the conversation.

She said projects like Energizar present an opportunity to advance cleaner energy solutions while prioritizing meaningful community engagement and long-term benefits for local residents, and that GreenRoots looks forward to continued collaboration to ensure Chelsea's needs remain at the forefront as the project progresses.

Stay Ahead of the US Power Sector Expansion; From Grid Modernization to Renewable Integration

The United States is embarking on a transformative era in the power sector, with significant investments directed towards grid modernization, renewable energy integration, and infrastructure upgrades. How can you identify which projects are legitimate, funded, and progressing before your competitors do?

The Global Project Tracking (GPT) platform by Blackridge Research provides power sector professionals with a single, reliable source of intelligence throughout the entire US project lifecycle. From early-stage announcements to final commissioning, every data point is verified and continuously updated, enabling your business development teams to act with confidence.

Whether you provide equipment, engineering services, or construction expertise, early visibility into the power sector pipeline is the key to securing contracts rather than losing them to competitors.

• Upcoming Projects

• Tender Notices

• Contract Awards

• Projects Under Construction

• Completed Projects

Book a Free Demo today and see how the Global Project Tracking (GPT) platform by Blackridge Research can sharpen your competitive edge in the United States power market.