High Quality Content by WIKIPEDIA articles! As of 2008, nuclear power in the United States is provided by 104 commercial reactors (69 pressurized water reactors and 35 boiling water reactors) licensed to operate at 65 nuclear power plants, producing a total of 806.2 TWh of electricity, which was 19.6% of the nation`s total electric energy generation in 2008. The United States is the world`s largest supplier of commercial nuclear power.