List of pumped-storage hydroelectric power stations https://en.wikipedia.org/wiki/List_of_pumped-storage_hydroel...
List of (non-hydro) energy storage power plants https://en.wikipedia.org/wiki/List_of_energy_storage_power_p...
Largest battery plants in particular: https://en.wikipedia.org/wiki/Battery_storage_power_station#...
"Really small capacity" here apparently means "roughly 4 hours of discharging as fast as possible".