Form Energy

Form Energy is an American energy-storage company building iron-air batteries that store electricity for 100 hours - multiple days - at roughly one-tenth the cost of lithium-ion. Founded in 2017 by a group of storage veterans, the company uses 'reversible rusting' of cheap, abundant iron to let renewable grids stay reliable through long stretches of low wind and sun. Its first high-volume factory, Form Factory 1, sits on the site of the former Weirton Steel mill in West Virginia, and its batteries are now being deployed with utilities including Great River Energy, Xcel Energy, Georgia Power and Dominion Energy.