Emergency crews will work through Monday night to restore power to more than 3000 homes and businesses in northern Sydney.
Network operator Ausgrid says power has been restored to more than 97 per cent of its customers impacted by last Tuesday's severe storms.
However, trees and branches damaged in the storms are continuing to fall across powerlines, causing new outages.
A falling tree damaged a powerline in northern Sydney on Monday evening, creating a new outage affecting 2400 homes and businesses around Hornsby, Asquith and Mount Colah.
About 700 customers were affected by a separate new outage around North Turramurra on Monday afternoon.
"Ausgrid is reminding people to stay well clear from fallen trees and branches as they can hide electrical hazards like fallen wires," the utility company said in a statement.
"Since the storms we have safely restored power to more than 50,300 homes and businesses across Sydney's north."
Ausgrid has previously said regulations prevented its staff from repairing customer equipment past the connection point and urged those affected to contact a qualified electrician to repair damage to their own equipment.
The distributor says the cyclone-like damage was some of the worst it had seen in a concentrated area.
But the Electrical Trades Union argues the length of the large-scale blackout highlights the impact of job cuts.
It says the workforce at NSW's three electricity distributors had been slashed by 40 per cent.
Australian Associated Press