Created: 2/29/2008 3:49:09 PM 
MIAMI (AP) -- Florida Power & Light says a power outage that affected more than half a million customers earlier this week was the result of human error.
The electric company released a 2-page preliminary report on the incident on Friday. It says that a field engineer investigating a switch that malfunctioned at one of the power company's substations in west Miami was to blame.
The company says ultimately two nuclear generation units and a natural gas unit at the Turkey Point facility south of Miami shut down. Two other FPL plants were also affected.
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