Yeah, but pumped hydro is really hard to implement in the Midwest since we don't even have hills. You can use quarries that are mined to two different depths, b

Yeah, but pumped hydro is really hard to implement in the Midwest since we don't even have hills. You can use quarries that are mined to two different depths, but you can't build a quarry large enough to really matter. Molten salt is interesting though, and I am not particularly familiar with that.