Thanks, NSW resident, I was going to write the same.
The Australian grid is at the forefront %age of renewable energy in the grid. This brings new challenges with it to which the answer is more batteries and more wind and solar.
But the NT (where the cable is running to) isn't connected to the Australian grid (which is effectively the East Coast, SA, and Tasmania), and there are no plans to do so. The Darwin grid is currently ~4-10% renewables depending on the day.
The Australian grid is at the forefront %age of renewable energy in the grid. This brings new challenges with it to which the answer is more batteries and more wind and solar.