I agree that we'll likely have a mix, but the point I was trying to make was: Before, we had low variability in demand, so things like nuclear, hydro, and geot

I agree that we'll likely have a mix, but the point I was trying to make was: Before, we had low variability in demand, so things like nuclear, hydro, and geothermal ("clean" methods of producing base load power) had a chance to compete. Now, we have high variability in demand, so all of those solutions are out (though hydro is a special case), unless externalities like future-cost of CO2 is priced into production cost via taxes or cap&trade. Wind/Solar + Storage is too expensive, so the market will shift to wind/solar + natural gas. We'll end up burning possibly more fossil fuel, or roughly the same.