the National   Renewable Energy Laboratory, or NREL used well  established Geographic Information Systems,   or GIS, to assess potential new closed-loop  pumped storage hydropower, or PSH,   systems across ALL the states, including  Alaska and Hawaii, as well as Puerto Rico.  That analysis turned up no fewer than  fourteen-thousand-eight-hundred-and-forty-six   00:04:51 potential sites with a combined storage capacity  of three-point five terawatts that could be   discharged over a ten-hour period, providing  some thirty-five terawatt-HOURS of energy into   the various American grid networks.