The damage to the electricity network in Kangaroo Valley is "substantial", with some homes still hooked up to generators.
An Endeavour Energy spokeswoman said Kangaroo Valley, Sussex Inlet, Conjola Park and Lake Conjola were the "hardest hit" in the distributor's coverage area.
"We are still doing final repairs on the network, particularly in Kangaroo Valley, so we will still have some customers that are being powered by generators in those areas," the spokeswoman said.
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She said people would not be "on generators for weeks" and their return to the network would be "sooner rather than later".
In Kangaroo Valley, it's the extent the repair job that sees homes using generators.
"In Kangaroo Valley the damage there was quite substantial so they've had to rebuild entire sections of the network, kilometres of the network," the spokeswoman said.
"We've had kilometres of bays of mains and power poles that have been destroyed."
Across the South Coast, she said Endeavour Energy crews put in a "phenomenal effort", restoring power to 20,000 premises in 10 days and replacing 600 power poles.
If people have bushfire-related concerns about connecting, they can contact Endeavour Energy on 131 003.