The polar vortex may give new life to aging coal and nuclear power plants in the U.S. Masses of arctic air rolling down from the North Pole have driven electricity prices to more than 10 times last year’s average in many parts of the country and have threatened some cities with winter blackouts. They’ve also emboldened energy companies to call for extending the lives of older and dirtier coal plants, as well as aging nuclear reactors. Despite a concerted campaign by environmentalists and public health experts to stanch its use, coal, the most plentiful and cheapest fuel in the world, is proving globally resilient. In the U.S., rising natural gas prices are prodding utilities to switch back to coal at levels not seen since 2011. Now, Edison Electric Institute, the Washington-based trade group of U.S. investor-owned utilities, is turning to the latest series of cold snaps to bolster their […]