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Form Energy · Minnesota · MinnesotaDEVELOPER HEALTHWATCH
Could be the world's largest battery by energy; phased 2028–2031.
Power
300 MW
Long-duration storage · Scaling
Storage
30 GWh
100-hour duration
Online
2028–2031, phased
approximate target
Capital committed
—
closed or awarded
Capital pending
—
conditional or under review
How it works
Discharging lets iron pellets rust in air, which releases electricity; charging turns the rust back into iron. Cheap, plentiful materials make 100-hour storage affordable.
OPEN IN 3D →No project-level financing disclosed yet.
Grid connection, permits, contractors and cost not researched yet for this project.
Xcel Energy (for Google)
Wind and solar backed by 30 GWh of Form batteries for a Google data center
STEP 5/5 · AT RISK Risk: data-center demand forecasts fallLater phases and options depend on load growth continuing; watch hyperscaler capex guidance.