Florida authorities are investigating how a small fire and a switch failure at an electrical substation outside Miami triggered a power failure that affected millions of people.
When a nuclear power plant sensed the disruption, it shut down. In turn, the state's power grid triggered rolling blackouts Tuesday across the state.
More than 2 million people lost power at the peak of the outages, but electricity quickly was restored to most parts of the state.
Authorities said no injuries were reported.
Florida Power & Light President Armando Olivera said a disconnect switch failed at 1:08 p.m. ET Tuesday at an automated substation west of Miami, and a piece of equipment that controls voltage caught fire about the same time. Neither failure by itself would have caused a widespread outage.
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