High Quality Content by WIKIPEDIA articles! The Oconee Nuclear Station is a nuclear power plant located on Lake Keowee near Seneca, South Carolina, and has an energy output capacity of over 2,500 megawatts. It is the second nuclear power plant in the United States to have its operating license extended for an additional twenty years by the U.S. Nuclear Regulatory Commission (NRC) (the application for the Calvert Cliffs plant in Maryland preceded it).