Cambridge Energy Storage Project

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Form Energy · Cambridge, MN · Minnesota DEVELOPER HEALTHWATCH

Form's first commercial iron-air battery (100-hour duration).

Long-duration storage · Multi-day, thermal and mechanical storage SEE CONNECTIONS →

ANNOUNCED
DEVELOPMENT
PERMITTED
FINANCED
CONSTRUCTION
OPERATING

Power

1.5 MW

Long-duration storage · Demonstration

Storage

150 MWh

100-hour duration

Online

2027

approximate target

Capital committed

—

closed or awarded

Capital pending

—

conditional or under review

ONLINE DATE HISTORY · 1 CHANGE · SLIPPED 1×

Nov 9, 2026: H1 2027 → 2027 · source

How it works

Iron-air

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 →

Capital stack

0 SOURCES

No project-level financing disclosed yet.

Milestones

Mid-2027 · APPROXIMATE TARGETOnline (target)

Grid, permits and build

Grid connection, permits, contractors and cost not researched yet for this project.

Who buys and who finances

Great River Energy

Utility-owned pilot

Great River EnergyUTILITY BUYER

Dependencies

SUPPLY CHAIN →

Critical inputs

Nickel

Policy that applies

45Y / 48E: all other clean power and storageACTIVE

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Cambridge Energy Storage Project

Iron-air

Capital stack

Milestones

Grid, permits and build

Who buys and who finances

Dependencies

Cambridge Energy Storage Project

Iron-air

Capital stack

Milestones

Grid, permits and build

Who buys and who finances

Dependencies

Related

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Sources