Way back in the day, before electrical power of any scale was really practical, the dock at Liverpool had a clever hydraulic energy storage scheme for operating its cranes and winches.
It looked kind of like pumped storage writ small, but with the trick that the accumulator towers were really giant hydraulic rams that lifted large weights to allow high working pressures without needing the towers to be overly high... Prime power was steam plant in a few engine house locations around the dock.
Did it work? Yes, it did, but it was far more about peak power demand then bulk energy storage, and we have easier ways to do that today.
Regards, Dan.