You kill the coal power plants, it will mean going without power for plants, homes, hospitals, nursing homes, schools, gov't buildings...on and on. How will the coal miners have power to run their equipment? Won't need as many miners if the coal production need is cut by one half or more. The steel mills will close because they have no power to make steel...which means the auto industry is impacted, then there is the railroads who depend heavily on hauling coal and cars....businesses that run in tandem with the coal industry, drip, drip pretty soon a depression worse than Hoover's!
It'd take 10 years to get a nuke plant up and running or more. Natural gas is out of the question as they won't let you drill for it in the US. Ditto oil.