More than 1,200 homes in Portrush were left without electricity after a helicopter struck power lines.
The incident took place at around 11:00 BST on Saturday and no injuries were reported.
Power was returned to most homes around 40 minutes later.
NIE Networks said: “A helicopter came into contact with an overhead line in the Portrush area at 11:00 interrupting supplies to approximately 1,240 customers.
“Power was restored to approximately 1,200 customers at 11:41. Emergency crews are working to repair the damage and to restore power to the remaining 40 customers as soon as possible.”