The correct topology is very common. All you need is water and a hill. We've already tapped most of the suitable places for hydro dams because those need flo

The correct topology is very common. All you need is water and a hill. We've already tapped most of the suitable places for hydro dams because those need flowing water. Pumped storage does not need flowing water so the number of potential sites is massively larger. ANU identified 616,000 potential sites: https://re100.eng.anu.edu.au/global/ https://re100.eng.anu.edu.au/global/