The water behind a dam is storage too, right? There are lots of examples of pumping water up into reservoirs when electricity is plentiful so it can be release

The water behind a dam is storage too, right? There are lots of examples of pumping water up into reservoirs when electricity is plentiful so it can be released when electricity is scarce, see https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricity https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricit...