Since its birth in 1933, the TVA has never been short of critics. Many blame the historically bad air in the Tennessee Valley on the arrogance of TVA management and the agency’s dirty, inefficient coal-fired power plants. But in the last few years, the TVA has begun retiring some of its older plants, refurbishing others and is starting to embrace different sources of fuel for the electricity it produces. WUOT's Matt Shafer Powell reports some of the utility's critics are beginning to take notice...