The state of South Australia already has 75% solar and wind electricity averaged over a year. It has no coal, hydro or nuclear, and is joined to the eastern states with skinny interconnections. South Australia is tracking towards 100% in 2027 as more solar, wind, transmission and batteries are deployed.
The contribution from wind and solar in South Australia was recently above 100% almost continuously for 3 days. The grid remained stable.
Australia generates more solar energy per capita than any other country and is in fourth place for combined per capita solar and wind generation. All other leading countries are in Europe and can share electricity, which helps to balance the grid.