[lacrew]

Intuitively, hydrogen cannot be as efficient as electricity. This is because it takes electricity to make hydrogen by electrolysis (there are other methods but electrolysis is the main way to do it), and that process is only 50% efficient.

So the hydrogen can be thought of as an energy storage device, not unlike a battery.

So, it uses twice as much electricity....but, the advantage is that you can ‘fill up’ the car with hydrogen much more quickly than recharging a traditional battery. But always remember, that ‘clean’ tailpipe in a hydrogen car masks a dirty smokestack earlier in the process.

Also, it is incredibly difficult to ship hydrogen around, so there never will be a large scale network of hydrogen filling stations. So, the concept is you ‘fill up’ at home, with your own water and electricity.

[robert14]

Hydrogen occupies about 6 times as much volume per BTU then gasoline. Where is the trailer that will be required to hold the Hydrogen?

[WackySam]

This is because it takes electricity to make hydrogen by electrolysis (there are other methods but electrolysis is the main way to do it)

Most Hydrogen is produced by converting natural gas, not electrolysis. This process also produces around 10 pounds of CO2 for every pound of Hydrogen.

[JimRed]

So, the concept is you ‘fill up’ at home, with your own water and electricity.

Windmill pumping well water and generating electricity for the conversion process?