This has existed for quite some time to deal w/ mismatches: https://en.m.wikipedia.org/wiki/Pumped-storage_hydroelectricity https://en.m.wikipedia.org/wiki/Pum

This has existed for quite some time to deal w/ mismatches: https://en.m.wikipedia.org/wiki/Pumped-storage_hydroelectricity https://en.m.wikipedia.org/wiki/Pumped-storage_hydroelectric...