The story

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. Read full article »

CNN's Susan Candiotti, Allan Chernoff, John Couwels, Cristy Lenz, Jeanne Meserve, Rich Phillips and John Zarrella contributed to this report.

All About Florida • Nuclear Energy