GoKawiilForm Energy advances iron-based batteries for long-duration energy storage
Form Energy has developed a new iron-based battery technology capable of storing energy for up to 100 hours, utilizing a reversible rusting process. The company has begun commercial production at its West Virginia facility, with a 150 MWh system scheduled for deployment in Minnesota in 2027, and has secured multiple deals including a large project with Xcel Energy to power a Google data center between 2028 and 2031. These batteries aim to provide multiday energy storage to support renewable power integration and reduce reliance on fossil fuels.
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This development could position Form Energy's batteries as a cost-effective solution for stabilizing power grids with high renewable penetration, potentially enabling more widespread adoption of wind and solar energy. If successful, it might influence the future landscape of energy storage technology and infrastructure, especially for long-duration applications.
- Form Energy's iron batteries can store energy for 100 hours.
- The company is targeting a cost of $20 per kilowatt-hour.
- Large-scale projects include a 30 GWh system for a Google data center.
Source: technologyreview.com — Jonathan W. Rosen, 2026-10-06
Published there as: “Form Energy and its iron batteries”
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