Here is an article that provides an interesting summary of different
approaches to storying energy:

https://arstechnica.com/information-technology/2017/10/a-world-tour-of-some-of-the-biggest-energy-storage-schemes/

One of the drawbacks of existing green energy sources is that they do not
necessarily produce energy during convenient hours.  These energy storage
mechanisms are intended to help out with that.

I had forgotten about pumped storage — pumping water uphill from one
reservoir to another.  The pumped storage stations in the article can
deliver orders of magnitude greater power than the alternatives, and they
presumably have a lot more storage capacity as well.

Eric

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