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by ben_w
864 days ago
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These kinds of gravity batteries worry me a little, because when I've seen the economics, they actually look pretty decent… and yet, that economic calculation ignores the other impacts, like them being terrible energy density and thus needing absurd volumes dedicated to them. Most proposals are even worse, as they suggest concrete rather than sand. The monetary cost works out even then, but concrete production currently emits CO2, and the combination of that with the low energy density means they'd have to run for around a century to only be as bad as fossil fuels. |
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