Per NY Times

A spokesman for Georgia Power, John Kraft, said the shutdown was caused when a piece of electrical equipment called a switchgear broke down. The power cutoff did not affect other parts of Atlanta.

“We believe that Delta Air Lines experienced an equipment failure overnight that caused their outage,” he said. “Our Georgia Power crews have been on site this morning. We’re working closely with the team at Delta as they repair that equipment.”

Good luck to everyone affected.