There were plans to build a hydrogen plant near Whyalla in South Australia, a famous steel-making site; see e.g. [1]. The tl;dr uses were export (I expected ammonia but the whole thing was vague enough to include hydrogen) on boats, reduction of iron ore ("decarbonisation", apparently requires magnetite) and while all the financial engineering that didn't happen was going to happen, energy storage for the grid, soaking up S.A.'s over-abundant solar.

Someone observed that this was the entirety of the presently-outgoing (but sure to be re-elected) state regime's story about reducing electricity bills in the state.

[1] https://research.csiro.au/hyresource/south-australian-govern...