Some states are doing better than others at energy
The top graph is South Australia’s energy grid. The bottom is Queensland’s. Yellow is solar, green is wind, orange is gas, purple is imports, and black is coal.
Something worth mentioning, at least according to the site you linked, $/Mwh SA $99.44 & QLD $214.46 at the time I’m writing this. So SA’s power is also generated at half the cost (if I’m understanding it correctly).