Is That the Engineering Challenge?

AEMO is moving from one system which has been based largely around centralized spinning machines and that has a certain quality or power to it. You're shifting now towards, as you said, wind and solar and battery storage,. maybe some hydro in the background there, but predominantly inverted based technologies. One of the challenges must be to actually manage that system because you're kind of switching from one to another and then back again. Is that a big complexity? I imagine if you were sort of doing the grid all over and starting over...