Consumers Power in MI uses electricity (at non-peak demand hours) to pump water to a high elevation along the bluff near Ludington, MI into big reservoirs, then during summer time peak electric hours lets it run back through turbines again.

So they don't store the electricity, they store the potential to make power by just moving the water to a different place.

IN your case, if you could use the elevation difference and perhaps during low flow months of the year you could divert the water to a higher elevation reservoir and then run it through the power system when you had a use for the power (like to run an aerator in the summer months) that may give you personal benefit beyond any financial benefit.

I know with the push for solar and the limitation we have in northern states where we don't have consistent sun that large liquid 'batteries' are the hot item to store 'energy' to do work later.

I guess if you had a Tesla battery wall mounted in your garage or basement then it would make sense to harness the water supplied energy year around as you would have a energy storage device.

Some have discussed getting an old electric vehicle battery pack that is beyond its life and reusing that as an energy storage device.