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Not sure what less efficient than charging electricity is right.
????
And major barrier of refitting service stations, some have it already much the same applies to battery charging infrastructure. The future is not clear
But 100% of hydrogen would have to come from "petrol" stations, whereas at least 70+% of electricity for EVs will be delivered by slow chargers at home/work which are rather less capex-intensive, and much of the long-distance transport of electricity is through infrastructure that is already built and paid for.
Except it looks like batteries are a long way off of being and good for HGVs
The Tesla prototypes have been trucking batteries for two years, due to go into production next year with a claimed 500-600 mile range full-laden. Given that truck drivers are legally obliged to take 45 minute breaks after 4.5 hours, the driver would need 2x45 minute breaks after driving a Tesla truck on full charge. It's an ask in terms of "mega-charging" infrastructure, and the likes of Scottish fish trucks going to Dover and beyond might need to wait for the 2nd or third generation, but for the typical London-Manchester run (around 200 miles each way) it would be fine.