I've seen designs for renewable energy storage that use gravity. These are often with water, but I've also seen designs using cranes and regenerative braking. I've seen designs like this that use load shedding for generating some useful feedstock material.

What I haven't seen is many people doing both at the same time. I might have seen a desal unit powered by green energy, which tops up the water towers when power is cheap, but not much beyond that.