Electricity is distributed everywhere. Hydrogen isn’t. This remains one of the biggest problem for hydrogen based transportation – lack of hydrogen distribution infrastructure. And this is not going to be cheap since hydrogen very likely has to be compressed and cooled to make it easy enough to transport in quantity.
The other issue is that hydrogen, at that volume, is going to be produced and hydrogen production (existing) requires energy. If countries have excess energy (say lots of cheap solar during the day), then it might make sense to utilize this for hydrogen production (aka green hydrogen). Otherwise the cheaper method is to generate it from natural gas.
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