When you have two thin metal plates separated by an insulator (even air) you can’t move electrons across the gap. You can crowd them, like when everybody crowds the platform waiting for the subway train to arrive (pre COVID). Since the train never comes, after a while you can open the gates and let all the electrons off the platform. Electrons can do this stupid fast, and nobody ever gets off the wires so it’s very efficient storage. Not big storage, like a chemical battery, but super fast.
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