Operating U.S. commercial power reactors

There are currently 94 units of commercial nuclear power reactors operating at 54 sites in 28 of the United States. Nuclear power regulation and operations in the country are subdivided into four regions by the US Nuclear Regulatory Commission: 20 units in Region 1 (CT, MD, NJ, NY, NH, PA); 35 units in Region 2 (AL, FL, GA, NC, SC, TN, VA); 21 units in Region 3 (IL, MI, MN, OH, WI), and; 18 units in Region 4 (AR, AZ, CA, KS, LA, MO, MS,  NE, TX, WA).

The entire US commercial power fleet is presently comprised entirely of light water fission reactors, meaning that normal water is used as both the reactor coolant and neutron moderator to control the atomic reaction. There are two basic designs for US light water reactors; the pressurized water reactor (PWR) and the boiling water reactor (BWR). The US commercially operates 63 PWR units and 31 BWR units.

The US NRC Information Digest (NUREG-1350, Vol. 34, 2022-2023 ), updated biennially, maintains the list of operating power reactors by their location, operator, manufacturer, power rating, licensing date, relicensing date, current license expiration date and other data. See NRC Information Digest (2022-2023), Appendix A, Operating Reactors. [NOTE: Georgia Power Vogtle Units 3 & 4,  are presently the only U.S. Generation III reactors to become commercially operational, both Westinghouse Electric AP1000 Pressurized Water Reactors,  which started generating commercial electrical power onto the grid on June 8, 2023 and May 3, 2024, respectively. The current published edition of the NRC Information Digest (Vol. 34) does not include the operational status for these two new units.]