Lines company Orion says fewer than 200 properties in Canterbury are still without power after last week's storm.
Initially, 28,000 Orion customers were affected when the storm caused major damage to power lines throughout the region.
Orion chief executive Rob Jamieson says the customers that remain without power are dispersed throughout rural Canterbury.
He says finishing the job is taking some time, as a repair that can take up most of a work crew's day only brings back electricity for a handful of properties at a time.
Mr Jamieson says residents using generators should make sure they are installed by registered electricians, so workers repairing the network aren't put in danger.
