You write as though coal power is constant. IN NSW and VIC, coal...

You write as though coal power is constant. IN NSW and VIC, coal has more intermittency than wind and solar.
The wind blows constantly enough for wind farms to be extremely profitable and to ride through the periods when coal and solar plants are offline. It is also well established that we have to much base load and we need more disbatchable power, hence snowy 2.0 is much needed.