The impact on the cost of electricity produced by coal would vary in the range of 15% if the price of coal varied by 50%. Once a nuclear plant is up and running, it reliably produces electricity at foreseeable cost, clearly an attractive feature for investors. Doubling the carbon price, for instance, from USD 30 per tonne of CO2 to USD 60 per tonne would increase the total average cost of coal-produced power by 30%, more than doubling its variable cost in the process.