Officials say power has been fully restored at Hartsfield-Jackson Atlanta International Airport.

The airport announced on its Twitter page minutes after its midnight deadline, “Power has been restored on all concourses. 5,000+ meals are being delivered to passengers. Trains will be operational soon.”

The world’s busiest airport lost power earlier in the day, halting all incoming and outgoing flights and leaving thousands stranded.

Georgia Power had said in a statement that a fire caused extensive damage in an underground electrical facility, impacting substations serving the airport. The cause of the fire is not yet known.