Power has been restored to 23,000 homes and businesses in Sydney's west after major power lines were brought down across Parramatta Road in Homebush.

Ausgrid said power was restored to homes in Strathfield, Burwood and Concord about 12.30pm on Thursday, about four hours after power lines fell across Parramatta Road at Homebush, near George and Station streets.

"Crews have successfully redirected supply to the Burwood zone substation from a different part of the network after completing emergency repairs to the power line on Parramatta Road," said a statement from Ausgrid, which operates the electricity distribution network.

Parramatta Road remained closed at Homebush until 2.30pm when all westbound lanes and one city bound lane were reopened.