How water can save solar: Using bulk storage to flatten the duck
"This points to bulk storage as an ideal solution for the problem. While unlikely to be promoted by Elon Musk in a Tesla showroom, pumped hydro storage may be the most ideal technology, as it is a long tested, mature technology with widely understood costs and operating parameters. It is well suited for large, sustained discharges of energy via pumping water during low cost periods (i.e., solar overgeneration periods) and releasing the water through hydro turbines when needed. The size and duration of the discharge is limited only by the size of the reservoirs."
Read more: Utility Dive | May 30, 2017