Hydrogen is extremely common* and can be produced in gigantic amounts. Hydrogen then can scale, especially if you have a lot of very cheap electricity to work with to ‘crack’ it from water and provide it to compress it. (From, for example, fusion reactors).
It’s sort of a ‘race’ between hydrogen and better battery chemistry to see what will be the energy storage of the future.
*As far as we know most of the universe is hydrogen, by a fairly large margin.
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