If the demand for electricity in Juneau were to grow while the region grappled with a handful of low precipitation years, could the existence of a pumped-hydro storage system prevent facilities like Greens Creek, the Federal Building and others from having to burn thousands of gallons of diesel fuel for their energy needs? Add this ‘natural battery’ concept to an increase in our region’s generating capacity and Juneau could be energy secure for decades.

Could pumped-hydro storage underpin a nationwide green-energy economy?

Source: The role of pumped-hydro storage in a 100% renewable world | RenewEconomy