newshound wrote:

Andy Burns wrote:

Twice as expensive?
https://en.wikipedia.org/wiki/Electrolysis_of_water#Efficiency

Yes, if you don't count the externality.

For once the guardian doesn't miss the mark

"At the moment, hydrogen is most commonly produced from natural gas. In
this situation, a typical fuel cell car generates 70€“80g CO2 for each
kilometre driven €“ similar to a modern gasoline hybrid or to a battery
electric vehicle charged with today's UK grid electricity. These
emissions can be reduced towards zero if the hydrogen is produced using
low-carbon electricity sources such as renewables, nuclear or CCS to
electrolyse water. The downside is that in this situation only around
half as much electricity comes out of the fuel cell as was put in to
produce the hydrogen in the first place."

https://www.theguardian.com/environment/2012/oct/11/hydrogen-economy-climate-change