Pumped hydro could deliver 100 percent renewable electricity

Potential global pumped hydro storage sites [CREDIT: Matthew Stocks Australian National University)Achieving 100 percent renewable power, as Congressional Democrats' Green New Deal and other proposals around the world envision, will require a lot of energy storage. And while the cost and availability of a storage batteries has made significant progress lately, they may not be the best solution to store renewable energy. A new study by...