Environmental News Service: A retaining wall at the Tennessee Valley Authority’s Kingston coal-fired power plant collapsed early Monday morning, causing 2.6 million cubic yards of fly ash to be spilled across hundreds of acres. The Kingston Steam Plant in Harriman, about 50 miles west of Knoxville, at the confluence of the Emory and Clinch Rivers is owned and operated by the nation’s largest public utility. The wet gray sludge buried about 400 acres six feet deep. One house was torn from its foundations, …