1951: Experimental Breeder Reactor
On December 20, 1951 at 1:50 pm, the very first amount of nuclear electricity is provided by a turbo-generator and lit four light bulbs, whose brilliant light marks the birth of nuclear energy. The next day, the experiment is repeated and this time the entire building housing the experiment is illuminated. As its name suggests, the first Experimental Breeder Reactor (EBR) was intended to do research on fast breeder reactors, of which it demonstrated the possibility before ceasing its activities in 1964.
Idaho National Laboratory