Ann: Macquarie Australia Conference, page-249

The only way enough energy can be moved from Qld to Vic in the future is by converting it to electricity. This would mean urgently expanding the interconnectors between Qld and the southern states and refitting major Victorian gas consumers to run on electricity, where possible. The Portland aluminium smelter, which consumes over 10% of Victoria's electricity, may have to take one for the team and close down.
The East Coast electricity network is physically separate from the WA network because of the huge power losses which would occur if an interconnector were built across the Nullarbor, even a DC one. So WA will be going it alone as far as electricity and gas goes for the foreseeable future.
Here's a snapshot of the AEMO Dashboard from a few minutes ago. It's interesting to watch how prices and flow varies wildly across the day between the States. The page auto updates every five minutes. As a general rule, as is happening at the moment, Qld electricity [from coal] usually flows south and South Australia power generation [gas and renewables] is almost always supplemented from Victoria [brown coal]. SA pays heavily for this.
https://aemo.com.au/en/energy-systems/electricity/national-electricity-market-nem/data-nem/data-dashboard-nem

The dependence on coal is far worse in the East Coast market. Usually over 60%. At the moment it is 62%, even with several recent coal fired generator closures. Chance of relying totally on renewables by 2030? About zero.