An emergency warning is in place for a three-hectare grass fire burning in the area of Richmond Road and Bennett Road at Windsor.
The Rural Fire Service says the grass fire is threatening properties around George Street and the area of Bligh Park.
The fire has crossed Garfield Road and is buring in the Windsor Downs Nature Reserve.
About 3200 homes in the Richmond area have lost power and Endeavour Energy says it is working to get the supply back.
For the latest on the fire threat in Sydney's west, read our live article: Bushfires threaten Sydney's western suburbs.