Drilling has to be extremely cheap and the geothermal heat extremely high to be economical, which is why it makes sense in iceland but not mainstream. Drilling

Drilling has to be extremely cheap and the geothermal heat extremely high to be economical, which is why it makes sense in iceland but not mainstream. Drilling and putting a nuclear reactor underground, much shallower than the deepest coal mines, can be quite expensive and still be cheap as a part of the total cost of the nuclear power station?