Who's going to pay for these mythical natural gas and coal plants that are idle until needed? Also with coal in particular it can take days to ramp them up - c

Who's going to pay for these mythical natural gas and coal plants that are idle until needed? Also with coal in particular it can take days to ramp them up - coal is for base load, not demand. If it were only as simple as you are postulating - which is why these 2nd level effects of blindly pushing renewables without taking the whole system into account are causing issues like we are seeing in Texas, California and many other places too.