Pumped hydro is a fantastic technology. It is unfortumate that we live under capitalism where development operates according to profit and not overall human benefit, so hydro dams are planned regardless of impact on indigenous communities or environmental and population harms. Countries rum by socialists will do a better job with this, particularly China, where pumped hydro dams are even sometimes combined with aquatic solar farms. While imperfect, these developments are far better than anything you’re in fully capitalist countries.