Ausgrid crews are working to restore power to Sydney homes with power still out to 29,000 homes, mostly in the north.
The storms overnight caused extensive damage to the network and customers in the worst hit areas are being advised to prepare for possibly another night without power. Traffic lights in some areas are also impacted.
The worst damage on the network in around the Belrose area and Ausgrid said customers should prepare for extended outages.
Other areas badly hit are Roseville, Gordon, Mount Colah, Epping, Lindfield, Pymble, Killara, Allambie Heights, East Lindfield and Hornsby Heights.
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Emergency crews have worked through the night to make safe life threatening hazards such as fallen powerlines. They are responding to more than 1500 hazards on the network, which must be made safe before power can be restored.
Extra crews are being brought down from Newcastle and the Central Coast to help with the storm response. All planned jobs on the network that don’t relate to storms have been cancelled to allow crews to focus on the storm repairs.
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