Industry: Energy
http://www.tva.com/

Although the Tennessee Valley Authority (TVA) may not be an expert on Tennessee attractions like Dollywood and the Grand Ole Opry, it is an authority on power generation. TVA is the largest government-owned power producer in the US, with more than 31,500 MW of generating capacity. The federal corporation transmits electricity to 158 local distribution utilities, which in turn serve 8.3 million consumers. It also provides power for industrial facilities and government agencies, and it manages the Tennessee River system for power production and flood control.
source: Hoover's.