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How does a flywheel battery work?

Grid power spins a carbon-fiber rotor inside a vacuum. Slowing it back down turns that motion into electricity again.

Loïc Bastard, CTO · Investor Q&A, 29 Sep

The full answer

Electricity spins a magnetically levitated rotor inside a sealed vacuum, turning electrical energy into the energy of motion. When the grid needs power, the spinning rotor drives a generator and that motion becomes electricity again. There is no electrochemical cell anywhere in the system.

The commercial product is the Q500, developed under the codename Pulsar.

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