Drivers should avoid President Avenue at Kirrawee after a power pole was brought down after being hit by a vehicle.
Ausgrid crews are at the scene repairing the broken power pole and returning power.
The accident has caused the closure of President Avenue between Acacia Road/ Princes Highway and Oak Road.
People should use the Princes Highway instead.
It is causing long delays for northbound traffic heading towards Cronulla.
Bus routes are also affected with some services delayed by up to 20 minutes.