[KaiserPro]

> Hydrogen is an energy store. It doesn't typically exist by itself in nature and must be produced.

I know hence the question.

to answer my question, which is also in the article you've kindly posted:

"Currently, most hydrogen is produced from fossil fuels, specifically natural gas"

Which is the point I'm getting at. Its cheaper to split natural gas than it is to do electrolysis.

What I have discovered is that state of the art electrolysis is about 80% which is far higher than I had remembered. Alas, fuel cells are still 40-60% efficient, so we could still be looking at terrible round trip efficiency.

Hydrogen might one day be the storage medium of choice, but its not yet. I suspect we'll have working fusion before we have practical grid scale hydrogen, let alone wide scale hydrogen cars.