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GridStor Hidden Lakes BESS

GridStor, Flatiron Energy, and Jupiter Power advance US BESS projects totalling 1.6GWh

September 22, 2025
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.
Flatiron Energy is a US BESS developer, so far focused on New England. Image: Flatiron Energy.
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Flatiron Energy proposes 672MWh BESS at former Massachusetts fossil plant, pauses indoor BESS project in Boston

September 9, 2025
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. 
SK On Flatiron BESS US manufacturing

SK On signs 7.2GWh deal to supply US-made LFP batteries to Flatiron Energy Development

September 5, 2025
South Korean company SK On has entered the US BESS market with LFP batteries, securing a supply contract with Flatiron Energy Development.

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SPP utility to invest over US$600 million in 1.9GWh BESS projects to address ‘significant capacity deficit’ 

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