Three US battery energy storage system (BESS) developers, GridStor, Flatiron, and Jupiter Power, have advanced BESS projects totalling 1.6GWh across Arizona, Massachusetts, and Michigan.

A flurry of large-scale BESS project news in the US from four major developer-operators, coinciding with the country’s largest clean energy trade show RE+.

Flatiron Energy has commenced initial proceedings to construct a 168MW/672MWh BESS at the site of a former coal-fired power plant located in Bristol County, Massachusetts. 

South Korean company SK On has entered the US BESS market with LFP batteries, securing a supply contract with Flatiron Energy Development.

Massachusetts’s electric distribution companies (EDCs) and the state’s Department of Energy Resources (DOER) have launched a request for proposals (RFP) for approximately 1,500MW of mid-duration energy storage systems.

Developer Rhynland Energy has applied to Massachusetts’ energy regulator for approval of a 180MW/720MWh standalone BESS, to the dismay of local authorities in the Town of Oakham.

A news roundup focusing on TerraFlow’s recent partnership with Storion, JinkoSolar’s deployment of distributed systems in Massachusetts and a credit facility for Lightshift.

Independent power producer (IPP) CleanCapital has acquired a 27MW solar and 25MWh battery storage portfolio across Massachusetts and California, from Pacifico Energy.

The US state of Massachusetts has taken steps to further its goal of procuring 5,000MW of energy storage by 2030.

According to the Q1 2025 US Energy Storage Monitor from Wood Mackenzie Power & Renewables and the American Clean Power Association (ACP), energy storage installations surpassed 12GW in 2024.