Currently power storage is tiny, even largest hydropower projects would be insufficient to provide backup power in most places. And just 2x renewables overbuil

Currently power storage is tiny, even largest hydropower projects would be insufficient to provide backup power in most places. And just 2x renewables overbuilt would regularly run below demands - sadly solar/wind is not acting on demand. And during drought also hydropower may be unable to work. And in most places hydropower, geothermal is unable to provide enough power. (please correct me if I am wrong! But last time I checked nearly no place can run on renewables without relying on importing fossil-based power, and places that succeed have ideal places for hydropower/geothermal)