Tech

Form Energy and its iron batteries

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 06/10/2026, 11:20:24 UTC.

Briefings

Form Energy is developing iron-air batteries using reversible rusting to store energy for 100 hours, aiming for a $20/kWh cost to compete with natural gas. The company has signed commercial deals with Xcel Energy and Great River Energy, with a Google data center project expected online between 2028 and 2031. Production capacity is 2 GWh annually, yet the company promises 80 GWh through commercial agreements, raising questions about scalability. The project requires approximately 75 football fields of land for its 30 GWh capacity.

Key points

• Form Energy uses reversible rusting to convert iron metal to rust during discharge and back to iron during charging, enabling 100-hour energy storage.
• The company's 2 GWh annual production capacity is significantly lower than the 80 GWh capacity promised in commercial agreements, raising scalability concerns.

Context and limitations

Cost per kilowatt-hour is not disclosed; exact land footprint for the Google project is not specified; long-term performance data beyond the initial deployment phase is unavailable.

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