The combination of pumped hydro with other storage technologies can increase renewables penetration, improve operational safety and reduce maintenance costs at large-scale hydropower plants, according to new research. The study also focuses on techniques to determine the optimal size of renewables-based pumped hydro storage systems.

Pumped hydro is highly cost competitive as a large-scale energy storage solution, according to a recent report by the San Diego County Water Authority. The higher capital costs of pumped storage technology versus battery storage are outweighed by the longer lifetime of pumped storage, which gives it a lower levelized cost, the authority said.