The Experimental Breeder Reactor I was constructed in 1949 to become a testing site to validate the nuclear physics theory. Although this nuclear power plant was able to accomplish its purpose, it played a bigger role in the history of nuclear energy when it became the world?s first electricity generating power plant. The plant then was able to generate enough energy to light four 200 watt light bulbs.

It was built in a desert area about 18 miles from Arco, Idaho. For a time it continued to work as an experiment and research reactor until it was decommissioned in 1964. After EBR-1 was deactivated it was replaced with a new reactor called EBR-II. It was declared a National Historic Landmark in December 21, 1965. The plant is usually open to the general public between Memorial Day and Labor Day, where two prototype reactors are on display.