The Tennessee Valley Authority is a federal corporation and the nations largest public power company. As a regional development agency, TVA supplies affordable, reliable power, supports a thriving river system, and stimulates sustainable economic development in the public interest. TVA operates fossil-fuel, nuclear, and hydropower plants, and also produces energy from renewable sources. It manages the nations fifth-largest river system to minimize flood risk, produce power, maintain navigation, provide recreational opportunities, and protect water quality in the 41,000-square-mile watershed.