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I doubt capacitors are cost-effective (or even feasible) at the energy-storage scale involved here, since I have not seen any serious proposals for using them. There are all kinds of alternatives that have been proposed, such as batteries and pumped water, but cost and engineering are issues that have to be considered.
A bug that farts methane may be more cost-effective. Despite the humor, that may turn out to be a useful technology.
Fred Bortz
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