Technology

I wonder how the dissipative losses on this technology compare to just pumping water up into a reservoir behind a dam. Because in theory the most simple way of storing potential energy that is also scalable without too much effort (you can use valleys in the natural landscape as a container, you don't need to build everything from scratch) is transferring large masses of water from a lower to a higher elevation. But the problem with that has always been friction/heat losses, which can be quite an issue whenever you try to replace chemical batteries with a physical energy storage.

Either way this will be fascinating to keep an eye on, if chemical batteries can be replaced by a much cheaper and more scalable option that would be a huge win for renewables.