Nuclear energy is energy contained within the nuclei of atoms. Currently, we can only harness the energy of large nuclei, but we may eventually be able to also utilize small nuclei which are far more abundant. In either case, a fuel is required and rather large/complex containment systems used, as well as tight safety regulations. Nuclear power is able to provide quite a lot of energy, but has drawbacks including limited downscaling, radioactive waste (albeit in small quantities), nuclear proliferation, and expensive infrastructure.
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