“It would take a football field of solar panels to produce 25 kilograms of hydrogen or the equivalent of filling the tanks of just five Toyota Mirai cars.” says this Recharge report ( https://bit.ly/3sbQTyQ ).
Even with lower costs for electrilyzers in future, the large requirements for solar power are not going to go away because the solar PV efficiencies are unlikely to show dramatic increases and are likely to plateau. Current highest efficiencies with commercial solar panels are in the 22-23% range, and unless technologies such as multi-junction solar cells with different semiconductor materials take over, the efficiencies even by 2030 might not be much higher than what they are right now.
Similar will be the case with wind power plants, in the context of area.
All the above are considering using renewable power for electrolysis to produce green hydrogen. Which probably is why green hydrogen production from biomass should be considered too, as this pathway could be much less energy intensive - as the plants have already done a fair amount of work for us!
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