Other problems: you require a pretty significant hydrological infrastructure for PS: upper and catchment resevoirs, and a sufficient gradient to provide a net energy differential.
The logistics make multi-purpose use of PS systems (vs. typical flood-control or irrigation reservoirs) somewhat problematic as water levels may fluctuate dramatically over a brief period of time, and spillways/headways constitute a significant flash-flood drowning risk unless access-controlled.
Still, yes, pretty efficient energy storage systems overall.
Other problems: you require a pretty significant hydrological infrastructure for PS: upper and catchment resevoirs, and a sufficient gradient to provide a net energy differential.
The logistics make multi-purpose use of PS systems (vs. typical flood-control or irrigation reservoirs) somewhat problematic as water levels may fluctuate dramatically over a brief period of time, and spillways/headways constitute a significant flash-flood drowning risk unless access-controlled.
Still, yes, pretty efficient energy storage systems overall.