Ausgrid has restored power to almost all of its customers one week after rain lashed NSW, with the energy provider now in the final stage of recovery.
The company on Sunday night said power had been restored to 139,300 storm-affected homes since the damaging weather last weekend.
Just 700 customers remained without power as of 10pm and the energy provider expected most of the remaining repair work to be carried out overnight.
However, Ausgrid said there were still some "extreme challenges including severe damage, remote access difficulties and complex rectification jobs".
The company expected outages in some remote locations like Calabash Bay, Milsons Passage and Scotland Island to extend beyond Sunday night - but Ausgrid said it would provide generators to such customers.
A small number of homes in restored areas with unique issues and faults were also facing continuing outages, with the company planning to address them on Monday.
"At this stage, Ausgrid estimates fewer than 500 customers fall into the above categories," the energy provider said in a statement on Sunday night.
Meanwhile, questions are being asked about compensation from Ausgrid.
According to the Ausgrid website, premises that have experienced a power outage for 12 hours or more in a metropolitan area or more than 18 hours in a non-metropolitan area can make a claim for $80.
However, the site also says "Interruption to supply relating to severe weather events or emergency situations may be excluded".
West Pymble man Hae Dong Choi has been keeping his three daughters' phones charged with his car battery or portable batteries his friends have kindly powered up.
"I can't make food," the father and private tutor told AAP.
"I have spent a lot of money and it's very inconvenient to have cold showers."
Mr Dong Choi says Ausgrid wants receipts or photos for what was in his fridge before paying compensation.
"They asked for proof (but) it's just common sense that whatever was in the fridge is gone," he said on Saturday.
Ausgrid did not respond to questions about compensation but said some parts of the network have had to be rebuilt from the ground up, with crews replacing snapped power poles and restringing hundreds of spans of powerlines.
Australian Associated Press