Not fixing the problem
"chose to black out South Australians rather than turn on a power station"
The problem is not that there isn't enough generation capacity, but rather that the operator refused to actually use the available capacity when necessary. Building a big pile of batteries and a small back-up plant isn't going to fix the problem, since the lack of back-up wasn't the issue in the first place. Proper oversight preventing the operator from blacking out 60,000 homes for no reason seems to be what's needed.