Historically South Australia has generally had the most expensive electricity in Australia.
The Australian Energy Minister, Mr Frydenberg has even placed some of that blame on the SA Government's and it's "self-inflicted wounds" on deciding to transition away from coal to clean energy.
However, in the article above has there is a link to this page:
https://reneweconomy.com.au/south-australia-had-lowest-cost-...
which states:
The renewable energy state of South Australia recorded the lowest prices in Australia’s main grid in October, a month when it sourced well over half of its it's electricity supply from wind and solar.
That would suggests that transition to clean energy is working out just fine.