Form Energy scales production of iron-based batteries enabling multi-day renewable energy storage

Form Energy manufactures long-duration iron-based batteries capable of storing energy for 100 hours using a reversible rusting process that is far cheaper than lithium-ion technology. The company has begun commercial production at its West Virginia facility and secured major deployment contracts including a 150-megawatt-hour system for Great River Energy launching in 2027 and a 30-gigawatt-hour project with Xcel Energy to support a Google data center. These batteries address the intermittency challenges of solar and wind power while supporting growing electricity demands from data centers.

Form Energy's iron-based battery technology addresses a fundamental challenge facing renewable energy adoption: the need to store power across extended periods when weather prevents solar and wind generation. Unlike conventional lithium-ion systems optimized for short-duration storage of four to six hours, Form's solution leverages an electrochemical process involving iron oxidation and reduction to enable 100-hour capacity at substantially lower material costs. The company's transition from development to commercial-scale manufacturing at its West Virginia facility marks a significant inflection point for the emerging long-duration storage sector.

The Minnesota deployments represent meaningful validation of the technology's commercial viability. Great River Energy's 150-megawatt-hour installation and Xcel Energy's 30-gigawatt-hour Google data center project demonstrate utility and corporate confidence in the approach. However, Form acknowledges it must achieve $20 per kilowatt-hour pricing to compete economically with fossil fuel generation, a target that remains unconfirmed for current production volumes.