Power officials in southern California imposed rolling blackouts on Thursday after a key transmission line went down in the midst of 100-degree temperatures.
About half a million people were without power for 30 minutes to one hour.
The state’s power grid is operated by the California Independent System Operator (ISO), which declared a transmission emergency on Thursday afternoon, according to reports from ISO.
Blackouts occurred in Fontana, La Puente, Cathedral City, Huntington Beach, Long Beach and Ontario.
Although the outage seemed to cause little more than inconvenience, it has marked one of the most serious power disruptions in California since the 2000 power crisis.
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