An interesting read on spinning (not "idling" reserve), solar thermal and wind capacity factors and night-time power requirements.
A nation still drawing 18,000MW in it’s sleep can’t go solar… « JoNova: Science, carbon, climate and tax
And it is all too easy to go down the Milne or Bandt road and say "let`s do it" with solar and wind - except it will be megabucks...and if Australia somehow halved its power requirements and went all renewables for stationary power...which would be available most of the time...probably...it ain`t the Greens` usual "Mr Nobody" who will be footing the bill.
Oh, I forgot - that`s what the carbon (dioxide) tax is for!
And to yet again ask
that inconvenient question - through Australia`s actions, by how much will the earth`s temperature....oh, never mind...