[cbmuser]

Unless you produce it using the Sulfur-Iodine cycle in a high-temperature nuclear reactor.

See: https://en.wikipedia.org/wiki/Sulfur%E2%80%93iodine_cycle

and: https://www.jaea.go.jp/04/o-arai/nhc/en/research/hydrogen_he...

[Rygian]

According to the Wikipedia article, it is still significantly worse than Just Using the Electricity (~21 to 48% efficiency just on the hydrogen production part, not counting distribution and consumption).