Forrest to build massive hydrogen, wind, solar and cabling factory in Queensland, page-120

Except … this is a plan to build the electrolysers which then are used to generate the hydrogen from renewable energy sources … a factory that has capacity to build 2GW of electrolyser output per annum is not generating hydrogen to power X number of houses, it’s building and selling the equipment which does that - and building that amount of capacity each year.

FFI also appears to plan to use some of this equipment to then itself generate hydrogen from renewable sources using other equipment which it appears FFI will also build - leading to a 100GW annual production of hydrogen by 2030. Thats 50x the amount in your calculations and your calculations appear to be out by about a factor of 1000 converting from GW/year to continuous kW/hr.