Experimental Breeder Reactor I (EBR-I) is a decommissioned research reactor and U.S. National Historic Landmark located in the desert about 18 miles (29 km) southeast of Arco, Idaho. At 1:50 p.m. on December 20, 1951, it became one of the world's first electricity-generating nuclear power plants when it produced sufficient electricity to illuminate four 200-watt light bulbs.EBR-I subsequently generated sufficient electricity to power its building, and continued to be used for experimental purposes until it wasdecommissioned in 1964. EBR-I was deactivated in 1964 and replaced with a new reactor, Experimental Breeder Reactor II. Landmark status for EBR-I was granted by President Lyndon Johnson and Glenn T. Seaborg on August 25, 1966.It was declared a National Historic Landmark in 1965and an IEEE Milestone in 2004.

Experimental Breeder Reactor I (EBR-I) is a decommissioned research reactor and U.S. National Historic Landmark located in the desert about 18 miles (29 km) southeast of Arco, Idaho. At 1:50 p.m. on December 20, 1951, it became one of the world's first electricity-generating nuclear power plants when it produced sufficient electricity to illuminate four 200-watt light bulbs.EBR-I subsequently generated sufficient electricity to power its building, and continued to be used for experimental purposes until it wasdecommissioned in 1964. EBR-I was deactivated in 1964 and replaced with a new reactor, Experimental Breeder Reactor II. Landmark status for EBR-I was granted by President Lyndon Johnson and Glenn T. Seaborg on August 25, 1966.It was declared a National Historic Landmark in 1965and an IEEE Milestone in 2004.