Flywheel energy storage

https://www.energiestro.net/technology/
These guys are serious: Concrete flywheel storage system for residential PV – pv magazine International
It has to be very precisely balanced. They don’t mention a system price yet.

Metaphorically, this idea won’t take off, literally though, it will.

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I like this one …

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If you have a wife, installing something like that in your shower might yield a few kWhs every morning before sunrise and evening after sunset… :sweat_smile: