Re:Ask HN: What interesting problems are you working on?
by jodrellblank on Wednesday January 29, 2020 @07:36PM
(#22187734)
So the plan is to build an underground reservoir, then dig deeper and build the lower reservoir? At that point, wouldn't it be easier to use the ocean as the upper reservoir, and dig down to build the lower reservoir, and pump seawater around?
How much water do you have to move to power a house, anyway? It must be a lot - a truck pulling a tank of water goes up a hill as part of a journey without worrying about running out of gas, and they could be carrying 40,000 litres or 40 tons of water. Presumably there is no way you could move enough water at home to make a hydro plant - pump it up at night with cheap electricity and run it down at peak time to save money?
How much water do you have to move to power a house, anyway? It must be a lot - a truck pulling a tank of water goes up a hill as part of a journey without worrying about running out of gas, and they could be carrying 40,000 litres or 40 tons of water. Presumably there is no way you could move enough water at home to make a hydro plant - pump it up at night with cheap electricity and run it down at peak time to save money?