I mean, at that point you would just call it a hydro power plant. Pretty much all hydropower doubles as storage due it’s flexibility, but typically don’t bother pumping water back up as it’s a waste of energy (as opposed to waiting for the river to do it’s work)
Are all hydro storage like that though? It doesn’t seem too outlandish to think of a hydro storage plant that is also fed by a river
I said most
I mean, at that point you would just call it a hydro power plant. Pretty much all hydropower doubles as storage due it’s flexibility, but typically don’t bother pumping water back up as it’s a waste of energy (as opposed to waiting for the river to do it’s work)