Reuters: The U.S. government on Wednesday filed a clean air lawsuit against Westar Energy, claiming the utility updated a Kansas coal-fired power plant without installing modern pollution controls. The U.S. Justice Department and the Environmental Protection Agency allege that Westar’s 1,857-megawatt Jeffrey Energy Center in St. Marys, Kansas, violated the Clean Air Act for more than a decade. The suit filed in U.S. district court in Kansas City, Kansas says Westar violated the ‘new …