Nuclear energy is the energy in the nucleus, or core, of an atom. Nuclear energy can be used to create electricity, but it must first be released from the atom. Show
Educational Resources in Your Inbox Join our community of educators and receive the latest information on National Geographic's resources for you and your students. Nuclear power plants generate electricity by using controlled nuclear fission chain reactions (i.e., splitting atoms) to heat water and produce steam to power turbines. Nuclear is often labeled a “clean” energy source because no greenhouse gases (GHGs) or other air emissions are released from the power plant. As the U.S. and other nations search for low-emission energy sources, the benefits of nuclear power must be weighed against the operational risks and the challenges of storing spent nuclear fuel and radioactive waste. Nuclear Energy Use and Potential
U.S. Electricity Generation by Source1
Nuclear Fuel
Fission of Uranium-235 in a Nuclear Reactor
Largest Identified Uranium Resources14
Energy and Environmental ImpactsThe nuclear fuel cycle is the entire process of producing, using, and disposing of uranium fuel. Powering a one-gigawatt nuclear plant for a year can require mining 20,000-400,000 mt of ore, processing it into 27.6 mt of uranium fuel, and disposing of 27.6 mt of highly radioactive spent fuel, of which 90% (by volume) is low-level waste, 7% is intermediate-level waste, and 3% is high-level waste.16,17 U.S. plants currently use “once-through” fuel cycles with no reprocessing.18,19
Uranium Fuel Cycle16
Life Cycle GHG Emissions of Nuclear Power26
Nuclear Waste
Spent Commercial Nuclear Fuel, Metric Tons40
Safety and Public Policy
Natural and Man-Made Exposures to Radiation41
Center for Sustainable Systems, University of Michigan. 2021. "Nuclear Energy Factsheet." Pub. No. CSS11-15. |