Home » Which isotope is used in the nuclear power plants to generate electricity? Atomic Structure MCQs Which isotope is used in the nuclear power plants to generate electricity? January 8, 2022 7 Views Q. Which isotope is used in the nuclear power plants to generate electricity? A. Uranium 235 B. Iodine 131 C. Cobalt 60 D. Uranium 238 Answer: Uranium 235