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Probably partially due to Australia being a good place for sun and wind, and partially for targeting 99% rather than 100%.
But that's the thing if the market becomes more reliable, than larger loads become feasible, which means usage, and economics start to move in unforeseen directions.
I did the same thing as OP but didn't assume electricity teleported 3,000 km from Tasmania to Northern Queensland.
Using the proprietary data for what each pole could carry I build a first principles simulation of the Australian grid to find where medium sized battery installations should be placed to provide maximum grid frequency correction.
The grid is already close to collapse on 40C days.
Forget moving to a renewable grid, keeping the lights on during a five day heat wave over the eastern seaboard is currently impossible.