Bigger cable, upgraded delivery infrastructure to support that cable (think more or stronger poles), transformer upgrades, and finally the charging stations which unlike the home ones aren't just a complicated switch because DC fast charging.
H2 is a stupid fuel, but the idea that high power vehicle charging stations are a cheap or simple upgrade to a gas station is ridiculous.
Hydrogen stations don’t. If you have to build new ones, especially if you have to supply them with enough power to create their own hydrogen for water, what’s the difference from just building EV chargers?
And if you’re going to add hydrogen to existing gasoline stations then same question.
If hydrogen was somehow able to use existing gasoline infrastructure it would make a lot more sense. But it’s not.
This like saying obviously we can distribute grain using gasoline infrastructure: after all, also both transported by trucks.