UK has been quietly and steadily adding wind over a longer time, and modernising the grid without so much as a hiccough, reaching around 35% (ignoring biomass). The grid is still underfunded and lacking in some respects though. The Nordics have progressed similarly, but further, though I think Denmark had a couple of missteps. Sweden is over half renewables by now, Finland not far behind, Norway and Iceland (OK, they have their geothermal advantage) up near 70%.

All over the last 15 or 20 years.

Sure, I'd like everyone to go that fast, or faster, but trying for the speed of Australia's solar rollout seems to be asking for trouble. Don't know enough to say if there was anything unavoidable, or unique to Australia in their problems...

The real issue in Australia, as I imagine it is in most countries, is the fossil fuel industries lobbying the government. Oh and because of lies and misinformation told to voters (thanks Facebook), the country voted in a creationist-level PM, who believes that if the whole world burns, it's a punishment from god.