Today ' s nuclear plants provide onefifth of our power but nearly two thirds of carbonfree electricity . Yes , the costs of wind and solar are dropping dramatically and that ' s great news . But for now , they provide just 5 % of our power supply . And scaling up their market share takes time . Retaining existing nuclear power is good for consumers . A nuclear plant operates around the clock , and wind and solar only operate when the wind is blowing and the sun is shining . In 2015 , one megawatt of wind capacityepmt 607 b produced power 32 % of the time and one megawatt of solar produced power 29 % of the t i m e n u c learpowervitaltohittingco 2 emissionstargetstel <| sep |> Y ' all childish for this lmao <| sep |> Sorry , you guys are going to be getting about 6 games of Tony Romo for a 2 nd rounder next year .