despite the hype, hydrogen as an energy source is in its early phase of plant development. as such it has high cost and many flaws in the argument and too little evidence to hold hydrogen up as viable. at the present its largely hypothetical.
I've been watching this development for 10 years and so far as I;'ve leaned theres no single plant that is in full production.
https://www.hydrogeninsight.com/industrial/swedens-largest-electrolyser-project-inaugurated-to-produce-hydrogen-for-green-steelmaking/2-1-1512389
and:This pioneering project, from both a technical and commercial point of view, consists of the construction, financing, and operation of a 100% renewable hydrogen production plant with PEM technology, with a nameplate capacity of up to three tons per day, using renewable energy from a photovoltaic plant.
'In the quest for a greener energy transition, SoHyCal represents a cornerstone in California's commitment to developing and promoting clean and sustainable hydrogen fuel technologies. The project is poised to significantly contribute to the surging demand for hydrogen, particularly for transportation applications, the reduction of emissions, and the decarbonization in mobility,' said Pedro Pajares, CEO of H2B2 USA.
https://www.bignewsnetwork.com/news/274017787/h2b2-electrolysis-technologies-unveils-sohycal-the-first-operational-green-hydrogen-plant-in-north-america#google_vignette
whether Aus can get any of the several plants in development is as yet moot. huge buckets of money being poured into these projects though does say something of the perceived cost/benefit analysis and the understanding that hydrogen production will be a profitable venture.
