Flatiron Energy has reached financial close on about USD850m of financing commitments for the 1.2 GWh Energizar BESS project in Chelsea, Massachusetts, United States (Flatiron Energy press release, 15/10/2026). Commercial operation is expected in the fourth quarter of 2027. The package comprises construction and bridge loan facilities, term loan facilities, letter of credit facilities, a preferred equity commitment and a tax credit transfer commitment.
Energizar is expected to provide capacity and peaking energy for the Boston grid. The project was one of two Flatiron projects selected by the Massachusetts Department of Energy Resources during its first solicitation launched in July 2025 (KEI 31/12/2025).
According to Enerdata’s Global Energy Research, US storage capacity would reach 31 GW by 2030 from 17 GW at the end of 2025.