The Intergovernmental Panel on Climate Change (IPCC) and other studies indicate that nuclear power's life cycle emissions range from 10 to 130 g CO2-eq/kWh, with an average of about 65 g CO2-eq/kWh, placing it on par with wind power and substantially lower than coal (around 900 g CO2-eq/kWh) and natural gas (around 450 g CO2-eq/kWh).
The World Nuclear Association reports that nuclear's lifecycle emissions are comparable to wind, hydroelectricity, and biomass,
While some analyses suggest higher emissions for nuclear due to assumptions about mine rehabilitation or energy-intensive enrichment processes, these are considered outliers.
The variability in reported emissions is largely due to differences in methodological approaches, such as the choice of life cycle assessment (LCA) method, assumptions about the electricity mix used in construction, and the grade of uranium ore.