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by syllable_studio
2115 days ago
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Because as noted in other comments here, all the best natural pumped-storage reservoirs are tapped. It's not feasible to build enough dams in enough places to get the job done. Furthermore, my most optimistic estimates show that underground solid mass gravity storage could compete with pumped hydro on cost anyways. One reason is that solid mass is about 2.5x heavier than water. If excavation is one of your biggest costs, this density is important. |
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