Question

a nuclear power facility harnesses energy via what energy process?
nuclear fusion
chemical reaction
nuclear fission
cold fusion

Explanation:

Nuclear power facilities use nuclear fission. In nuclear fission, heavy - nucleus atoms (such as uranium - 235) are split into smaller nuclei, releasing a large amount of energy. Nuclear fusion (combining light nuclei) is not yet used in commercial power plants. Chemical reactions involve electron transfer and do not release as much energy as nuclear reactions. Cold fusion is a theoretical and unproven concept.

Answer:

nuclear fission