Originally Posted by
DiscoMick
No, coal is the most expensive and is basically uncompetitive when the sun is shining and the wind is blowing. Gas is cheaper than coal, but dearer than renewables. Renewables don't have to mine and transport fuel, so they are the cheapest.
Coal power stations have to run continuously at at least about 70% of capacity to be profitable. They can't do that, unless they have fixed contracts, such as the Gladstone coal station which has fixed contracts with heavy industry until 2027. Coal stations can't easily be switched on and off, unlike gas, batteries, hydro, wind and solar.
So renewables, solar, wind, hydro and batteries will be the cheapest and gas will fill the gaps.