Comment by tialaramex

To be fair Australia is very sunny. https://en.wikipedia.org/wiki/Solar_irradiance

It also has relatively wealthy people, living in lots of individual housing units. If you wanted to design a country that's perfect for rooftop solar your imagination might come up with Australia.

That said, Australia ought to be able to run almost everything off solar given how sunny it is, and instead solar is a distant second behind coal for electricity production. So there's plenty of work left to do.