The best way to legitimately consider cost of different sources of energy production is to determine the kWh cost. This calculation is broken down into the following equations:
Construction/kWh + Production/kWh + Decommissioning/kWh (nuclear only) = Total Cost/kWh
Once the calculations are performed nuclear and coal come out at about .04$/kWh while wind and natural gas are between .05 and .1 $/kWh. Hydro is the cheapest; however, is not a feasible option in most places. Solar comes in as the most expensive by far.
Sources:
http://nuclearfissionary.com/2010/04/02/comparing-energy-costs-of-nuclear-coal-gas-wind-and-solar/
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