Pure Hydrogen is highly corrosive, and highly explosive. Way too dangerous to use as fuel, for mobile vehicles, or for stationary power sources. Even as fuel cells, it is way too dangerous.

That said, Hythane which is a mixture of methane gas and hydrogen uo to about 15% is a sensible fuel for stationary power plants.

Hythane packs more punch than pure methane, and it ignites way faster, and causes the methane that with with it to burn hot, clean, and totally.

My book on Clean air covers this in detail.

By 2036 a Big Person will “discover” Hythane.

+++++

Not the same thing is hydrogen as contemplated by Amazon/Helios which would be used in a hot fusion reactor. That is possible, and if it happens it will be a game-changer.

It depends of ignition by lasers, and containment by high gauss torus shaped magnetic field.

So hydrogen as fusion reactor material, and hydrogen as fuel are quite different topics.