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Deep diveENERGY

Iron-Air Battery Grid Storage System IronGrid Deep Dive: Grid-Scale Storage at One-Tenth the Cost of Lithium

Form Energy's IronGrid iron-air battery storage system is deployed in Minnesota, reducing storage costs to $20 per kilowatt-hour.

Iron-Air Battery Grid Storage System IronGrid Deep Dive: Grid-Scale Storage at One-Tenth the Cost of Lithium

In April 2029, US energy storage company Form Energy completed deployment of its first 100MW/1,000MWh IronGrid iron-air battery storage system in Minnesota. The system can store 1,000 megawatt-hours of electricity—enough to power a town of 100,000 households for 10 hours—at a storage cost of just $20 per kilowatt-hour, one-tenth that of lithium-ion battery storage.

Iron-air batteries operate on the iron redox reaction. During charging, current reduces rust (iron oxide) back to metallic iron; during discharging, iron reacts with atmospheric oxygen to regenerate rust, releasing electricity. Iron is one of Earth's most abundant metals at under $100 per ton, far cheaper than lithium, cobalt, or nickel.

Form Energy CEO Mateo Jaramillo stated: "Renewable energy's biggest bottleneck isn't generation—it's storage. Wind doesn't always blow, sunlight doesn't always shine. IronGrid lets grid operators store days or even weeks of electricity at extremely low cost, completely solving renewable energy's intermittency problem."

IronGrid's other advantage is ultra-long lifespan. Iron-air batteries exceed 10,000 cycles—at one charge-discharge per day, that's nearly 30 years of use. And when decommissioned, the iron material is 100% recyclable.

However, iron-air batteries' energy conversion efficiency (approximately 45%) is far below lithium batteries (approximately 90%), meaning every kilowatt-hour stored requires about 2.2 kilowatt-hours of input energy. Form Energy argues that for grid-scale storage, low cost matters more than high efficiency.

Minnesota Energy Agency director Dr. Katherine Miller stated: "IronGrid lets us see, for the first time, the possibility of a 100% renewable energy grid. When storage costs are low enough, over-building wind and solar to compensate for intermittency becomes economically viable."