Dumb question: Why can't we store the excess capacity midday for consumption during the evening? E.g. using using solar to pump reservoirs to a higher elevati

Dumb question: Why can't we store the excess capacity midday for consumption during the evening? E.g. using using solar to pump reservoirs to a higher elevation then hydropower during the day? I know they do it with natural lakes[1] but couldn't we simply do this more? https://www.nytimes.com/interactive/2023/05/02/climate/hydroelectric-power-energy.html https://www.nytimes.com/interactive/2023/05/02/climate/hydro...