Crews are working to restore power to more than 300 homes across the Blue Mountains after bushfires ripped through power poles and lines.
More than 250 Endeavour Energy staff were on the ground on Sunday working to restore power to 320 customers across Winmalee, Yellow Rock, Springwood, Hartley Vale and Lithgow.
As long as it is safe and fire conditions don't deteriorate, Endeavour Energy said it expected power to be returned to the area on Sunday evening.
High temperatures and winds of up to 100 km/h have brought down trees and many kilometres of power lines, with fires burning 100 poles in the region, the energy provider said.
Local crews have been bolstered with additional staff from western Sydney to safely restore supply to those residents returning to their homes.
"Endeavour Energy will continue to work with the RFS and police in their investigations regarding the cause of some of the fires.
"We are also undertaking our own investigation to assist."Our thoughts remain with those families who have lost homes and property as a result of these devastating bushfires."