Sydney homes lose power in heatwave

About 11,000 homes and businesses have lost power in Sydney's west, as soaring temperatures place pressure on the state's power supply.

The blackout is due to a fault at a major substation and is not load shedding, Ausgrid says.

The main suburbs affected by the blackout are Strathfield, Burwood, Croydon and Homebush.

Power to most customers in Strathfield & Burwood has been restored, and crews are working to reconnect 750 properties around Burwood Rd & Queen St, Ausgrid said.