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Iron-air multi-day batteryForm Energy—Iron-air multi-day batteryForm Energy—Iron-air multi-day batteryForm Energy—

Form Energy

Iron-air batteries, 100-hour grid storage

USprivateest. 2017formenergy.com (opens formenergy.com)Checked 25 Sep

The brief

Analyst view
  • Iron, water and air are cheap and plentiful, aiming for multi-day storage far cheaper per kWh than lithium-ion.
  • First 1.5 MW / 150 MWh system delivered to Great River Energy, Minnesota, in late 2025.
  • Utility projects with Xcel Energy and Georgia Power follow in 2026.
Programs

Form Energy, one program

Updated 12 Aug 2026
Iron-air multi-day batteryEach cell discharges by rusting iron with oxygen from the air, and charges by turning the rust back into iron. Cells are grouped in container-sized units for utilities.DeployNextXcel Energy and Georgia Power projects online · 2026Updated 12 Aug 2026View program →
Research · Proto · Pilot · Deploy · Scaling

Upcoming catalysts

Company-wide
  • 2027Deliveries of iron-air batteries to Crusoe data centres beginIron-air multi-day batteryby ~15 mo
  • 2029FuturEnergy Ireland 1 GWh iron-air project due onlineIron-air multi-day batteryby ~39 mo

Company & funding

HQ
US
Founded
2017

People

Key people
Primer