Electricity has been restored to more than 28,000 Ausgrid customers after storms lashed Sydney, but parts of the city are facing another night without power.
Up to 24,000 houses and businesses remained without power on Wednesday afternoon after severe storms caused "extensive damage" to the city's electricity network on Tuesday.
The utility company said suburbs in the north of Sydney are now facing the prospect of extended outages.
"Customers in the worst-affected areas are being advised to prepare now for another night without power," an Ausgrid spokesman said in a statement.
At the height of Tuesday's storms, 52,000 customers were without electricity.
The worst-affected suburbs include Roseville, Gordon, Epping, Chatswood, Frenchs Forest and surrounding areas, Ausgrid said.
Extra crews are travelling from Newcastle and the Central Coast to help with repairs - with storm-related damage to be prioritised.
NSW was a "state of extremes" on Tuesday as severe storms downed trees and powerlines in Sydney, snow fell in Thredbo and other parts of the state sweltered.
Winds reached up to 104 km/h at Fort Denison, closely followed by 96km/h in Holsworthy and 95km/h in Sydney Harbour.
Sydneysiders have been warned to stay well clear of fallen wires and debris.
Australian Associated Press