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Such as? Gravity is a terrible way to store energy, and everything else seems to be 20 years out.

https://en.wikipedia.org/wiki/Power_to_gas for example. Iron-air batteries or redox-flow batteries also look very promising.

This is the “20 years out” that I mentioned.

In the meantime, it’s lithium.

Power to gas is available today, we just need to build the electrolyzers. Several MW worth are already operating in Germany for R&D purposes.