affordable A very subjective description.
I think any proper objective assessment would come to the same conclusion if all the costs of both systems were included from the turning of the first sod for the start of construction to the site cleanup at the end of useful life.
Our local coal fired station uses 4million tons of quality thermal coal per year. I haven't been able to find out what is paid for that coal as I'm not privy to the contracts. however if we use a middle of the road figure of $50 / ton it means an annual cost of $200,000,000 just to fuel it. Fuel for renewables $0
Costing must include health effects on miners and people living in the smoke plume plus long term CO2 effects on climate. I'm sure others will add to this list.