I'd hope somewhere like Spain would do the same in Europe. They have all the sunshine./QUOTE]
You might be surprised to learn that Spain generates most of its renewable energy from hydro and wind, not solar.
You can create hydrogen by hydrolysis and water using electricity.
Electricity supplied via renewables when in surfeit. I understand there's at least one German plant doing this already.
Or you could have 3x as much electricity to put directly into cars "when in surfeit"and allow people to charge at home whilst asleep instead of at a filling station ata price higher than petrol (from what I've seen, the non subsidised price of H2 is approx 2x that of petrol on a per mile basis)
Excess solar capacity is the issue especially on windy days. The times that the gas power station I work with is beginning to run more at night than day time because people are charging devices at night.
Aberdeen council giving tours of their new hydrogen station now, quite a few buses are hydrogen and they have a few of those massive and dated looking cars (Mirai, is it?)
The irony of their tours is that you have to be 18.....but you can drive a hydrogen car at 17......
H2 is a very inefficient but very energy dense and very fast charging type of battery that is more dangerous than Li-Ion if there is a fire. Does that sound right? Did I miss any significant advantage/disadvantage?
The inefficient and potentially dangerous parts are there to stay, while the energy density is probably going to be hard to beat (there is maybe something about the conversion to usable energy with a size to power ratio) but the charging speed seems to be a short term advantage.
I can't see that replacing all batteries, but until the density (and to some extent charging speed) improve significantly, I can't help but wonder if that would make a good REX technology, so we can leave the H2 tank empty most of the time, but use it when we need/want to go far fast.
H2 is a very inefficient but very energy dense and very fast charging type of battery that is more dangerous than Li-Ion if there is a fire. Does that sound right? Did I miss any significant advantage/disadvantage?
Before we went to North Sea etc natural gas, the coal gas supplied to houses was mostly H. Don't recall anyone banging on about how flammable it was! They just got on with cooking dinner!!
I don't beleive it was "mostly" H2*, but even if it was, the fact it was used then is no more justification for using it now than we should start whitening bread with arsenic "because that's how they did it in the good old days"
* because if It was mostly H2 then there would have been explosions aplenty as it leaked out of pipes wholesale and as all the pipes disintegrated. AFAIK you can't put more more than 5-10% H2 into the current gas supply without hitting those issues
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