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https://en.wikipedia.org/wiki/Bath_County_Pumped_Storage_Sta...

Pumped Hydro energy storage is the #1 energy storage in America, and probably the world. A single plant provides 24GW-hrs of energy storage, dozens of more energy storage than all American utility scale Li-Ion batteries combined.

Bath County is the biggest pumped-hydro battery in the USA (and probably the world), but there are dozens of pumped-hydro plants across the country.

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Turns out that all the water in a lake can hold a huge amount of potential energy through gravity: just pump it up a mountain.

Thanks for the link and apologies for the skepticism. I didn't know we had systems that basically slosh water from upper to lower during high demand and lower to upper during low demand to even out capacity.

https://youtu.be/6Jx_bJgIFhI https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricit...

Actual mechanical pumping.

That's two separate issues. In many existing hydro systems, the turbines are operated in reverse in order to store power.

Sure, if it's all in pipes and if it's pumping into a large volume rather than just river outflow. Sounds good.