3 ms·
> You're thinking too small though ;). You can dig a mile deep. And you can lift enormous weights. But at that point, why wouldn't you just do a classic pumped
by gspr 6y ago
> You're thinking too small though ;). You can dig a mile deep. And you can lift enormous weights.
But at that point, why wouldn't you just do a classic pumped-storage reservoir?
- syllable_studio 6y agoBecause 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.