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It is in fact a thing: https://en.m.wikipedia.org/wiki/Flywheel_storage_power_system https://en.m.wikipedia.org/wiki/Flywheel_storage_power_syste... I believe

It is in fact a thing: https://en.m.wikipedia.org/wiki/Flywheel_storage_power_system https://en.m.wikipedia.org/wiki/Flywheel_storage_power_syste... I believe (but I am 0% expert) these are mostly but not exclusively used for adding inertia to the system, rather than real energy storage.

immibis 2y ago
Close, but you're looking for: https://en.wikipedia.org/wiki/Synchronous_condenser https://en.wikipedia.org/wiki/Synchronous_condenser