CALDWELL TIME
7:0407AM
Monday
October 19, 2026
12369
America/Boise
Temperature
4°C
☀️
Conditions
Clear skyHum
72%
Wind
2.5 mph
CITY EVENTS CALDWELL
Idaho CURIO • #1 OF 2
Arco: First City in the World Powered by Nuclear Energy
On July 17, 1955, the desert town of Arco became the first community on Earth to have its entire municipal electrical grid powered by atomic energy, generated by the nearby BORAX-III reactor.
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Community Guide & Municipal Profile
About Caldwell, Idaho
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