Areas that are yet to receive power - since the cyclone on February 14 - include a list of rural communities as well as flood-ravaged locations such as Esk Valley, Dartmoor and Awatoto.
“Where a property has had flood damage ... an electrical inspection is required before the property can be reconnected to the network,” a Unison statement read.
“This is to prevent the risk of harm from electricity or damage to property [such as] an electrical fire.
“Unison, with the help of agreed contractors, is arranging for these inspections to be carried out.”
Unison incident controller Jason Larkin told RNZ on Tuesday they were working hard to get generators set up in rural communities.
“There are areas where it is going to take weeks, if not months, to repair and rebuild the network, but we are doing everything we can to try to bring back power to all our customers as soon as possible,” he said.
“We are looking at options like local generation and are now generating at a number of sites.”
He said a challenge had been getting enough fuel to some generators set up in rural communities, such as Patoka, which is hard to access.
However, he said work was being done to make sure a steady supply of fuel was getting to those generators.
“We really are concerned about these communities that have now been without power for two weeks, and are looking at all available options.”
Unison has a team of about 120 field workers on the ground trying to restore power, and about 60 electricity workers have come in to help from outside the region.
A new temporary depot has been set up in Pandora to support the crews.
- Additional reporting RNZ