Energy Storage Facility | Chelsea, Massachusetts
Energizar, developed by Flatiron Energy, is set to redefine energy storage. This cutting-edge system will bolster clean energy production while delivering dependable power to local homes and businesses during high-demand periods.
.webp)
Energizar is a battery energy storage system currently in the late stages of development by Flatiron Energy in Chelsea, Massachusetts. When completed, Energizar will store up to 1,000 megawatt-hours (MWh) of energy, supporting clean energy generation and providing reliable electricity to local homes and businesses during peak demand.
The facility is scheduled to commence operations in Q2 2027.
This is the system’s maximum power output at any given time.
1 megawatt (MW) = 1,000,000 watts.
Real-world example:
250 MW of power would light up 2.5 million 100-watt light bulbs.
This is the maximum amount of energy the system can store.
1 MW of power sustained for an hour = 1 MWh.
Real-world example:
1,000 MWh is enough energy to power around 50,000 Massachusetts households for a month.
Over the next 20 years, Energizar will direct more than $15 million toward clean energy workforce development and occupational job training. These programs will include wrap-around services to support trainees’ families.
As part of its agreement with the city of Chelsea, Flatiron Energy has made strong commitments to hire local skilled workers for the project’s construction, including hosting a local job fair and providing training for hired workers.
The finished project site will bring trees and landscape improvements to the industrial Eastern Avenue corridor. Noise mitigation measures, such as roof parapets, will be deployed to minimize the facility’s impact on local residents.
Battery storage is key to supporting renewable energy development. Energizar will store and distribute power created by solar, wind, and other forms of energy, making it cheaper and more accessible.
Energizar will invest over $45 million in total taxes, wages, and other benefits to the surrounding area and is expected to be one of Chelsea’s two largest taxpayers over its entire lifetime.
Energy storage benefits local residents by improving the reliability of power grid infrastructure. Batteries provide safe, reliable energy to local residents, reducing the likelihood of blackouts and helping the grid meet peak demand without burning fossil fuels.
For generations, Chelsea has supported vital functions of the Greater Boston economy at the cost of its residents’ health. Heavy industrial activity and freight traffic have made Chelsea one of the hottest areas in the region and frequently reduce the area’s air quality. The Commonwealth of Massachusetts considers Chelsea an Environmental Justice population, meaning its residents are more vulnerable to the impacts of climate change.
Growing awareness around environmental injustice has led to action addressing the situation. By providing a broad range of local benefits—including workforce development, environmental improvements, and community infrastructure investments—Energizar aims to reduce the effects that climate change imposes on local residents. Energizar builds on previous initiatives to improve community resilience, such as the Chelsea microgrid and heat mitigation efforts near the Jordan Boys and Girls Club on Willow Street, to reverse a long history of environmental injustice in Chelsea.
Battery energy storage systems (BESS) support clean energy deployment by holding surplus energy for use when demand increases. The result is cleaner air, reduced carbon pollution, and more affordable energy. Energizar will be a critical step in helping Massachusetts achieve its goal of net-zero greenhouse gas emissions by 2050.
Renewable energy sources produce power intermittently. Often, peak electricity demand does not align with when renewables produce the most energy.
Batteries capture and hold the energy created by renewables and other sources so it can be used later. Without storage, any energy that isn’t immediately used is lost.
During times of peak energy demand, batteries release stored energy into the grid. This helps prevent blackouts and grid strain. Batteries also provide key grid services during all hours of the day.
Project permits received, property acquired
Construction commences
Target operations date
Annual performance reviews
As a certified B Corporation, we deeply value the input of our community.
