Despite, the inefficiencies (losing 20-30%) there are large environmental impacts associated with turning a large amount of land into a lake. Additionally, whe

Despite, the inefficiencies (losing 20-30%) there are large environmental impacts associated with turning a large amount of land into a lake. Additionally, when a drought occurs almost all the storage capacity is lost. We are at the stage with battery technologies, where it would make absolutely to build hydro storage, even given the current trend of removing dams.