The Iron-air battery that stores electricity through controlled rusting is about to deploy at commercial scale in California — and it promises 100-hour energy storage at a fraction of lithium's cost using the most abundant metal on Earth. Form Energy's rust battery technology — which stores electricity by oxidizing iron when discharging and reversing that process during charging — is set to come online in California in 2026, delivering a 100-hour backup capability that no lithium-ion battery system can match economically at grid scale. The technology has been nicknamed the rust battery because its fundamental electrochemical process is essentially controlled, reversible rusting — iron becoming iron oxide as it releases electrons, and iron oxide becoming iron again as it absorbs electrons during charging using renewable electricity.
The 100-hour discharge duration is the specific capability that separates iron-air batteries from lithium-ion in the grid storage market. Lithium-ion batteries optimized for grid applications typically discharge over four to eight hours — enough to manage daily solar and wind variability but insufficient for the multi-day periods of low renewable generation that occur during winter weather events, extended cloud cover, or calm wind periods that can persist for 48 to 100 hours. An iron-air battery that can supply stored clean electricity through these extended low-generation windows eliminates the last significant reliability argument for keeping gas backup plants connected to renewable-dominant grids.
Iron's combination of geological abundance, low raw material cost, and the absence of the cobalt, lithium, and nickel supply chain vulnerabilities that affect lithium-ion chemistry gives iron-air batteries a structural cost and supply security advantage that the long-duration storage market has been waiting for.
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