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Hydrogen fuel cells are the way forward if they can crack the production cost issues.
Might be if:
a) they can split hydrogen from water efficiently - no sign yet - but you never know.
b) you could store it for more than a week in a vehicle - big problem because it leaks out of any practical container because the molecules are so small.
a) That's one possible realistic use of wind turbines. There's a wind farm in Shetland that uses it's output to electrolyse seawater producing and storing hydrogen. I believe there are similar projects in the US and Europe now.
b) Only if you store it as gas.