The average age of U.S. commercial nuclear power reactors that were operational as of October 31, 2020, was about 39 years. The oldest operating reactor is Nine Mile Point 1 in New York, which entered commercial service in December 1969. The newest reactor to enter service is Tennessee’s Watts Bar Unit 2, which began operation in June 2016. The next-youngest operating reactor is Watts Bar Unit 1, also in Tennessee, which entered service in May 1996.
The U.S. Nuclear Regulatory Commission (NRC) licenses U.S. commercial nuclear reactors for 40 years. Before termination of the original license, companies may apply to the NRC for 20-year license extensions.
Last updated: December 29, 2020