Nearly a million people in South Florida lost power this afternoon, a blackout that officials are blaming on a substation failure that subsequently caused both nuclear reactors at Florida Power & Electric's Turkey Point plant to go offline.

Perhaps most notable is that the outage knocked out all but four of Miami-Dade County's 2,670 traffic lights, leading to -- and we're just guessing here -- 2,666 scenes like the above photo from the Miami Herald.

The failure occurred early this afternoon and knocked out power to customers north of Miami on both the Atlantic and Gulf coasts. The "significant equipment failure" at the substation triggered the automatic shutdown of both nearby nuclear reactors.

According to the AFP, the Federal Energy Regulatory Commission said in a statement it was "monitoring the widespread power outages in Florida" and looking into possible violations of federal rules as it consulted with other US agencies. By late this afternoon, power had been restored for the majority of Floridians.