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The grid needs more than just big batteries it also needs extremely responsive ones. This is why you see flywheels attached to the grid.

https://www.popularmechanics.com/science/energy/a4889/433775...

The total energy stored is relatively tiny, but devices want a smooth electrical signal not just energy from a wire.

Ideally you want an instant response time and GWh of energy storage on the cheap, but that instead grid operators use many different systems to simulate that.




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