A blackout will be imposed on Opotiki township today as Transpower carries out urgent repairs to its transmission network.
It will see schools and businesses close but could prove dire for those in need of air conditioning, with the town set for a high of 24C.
Transpower has told the Opotiki District Council the work is so urgent that it if it isn't carried out it could lead to equipment failure leading to an outage for a "significantly longer period of time".
The town's library and i-Site is also closed today, as is the council's main office.
Transpower this morning released thermal imagery of the affected power lines, saying it was reaching up to a dangerous 175C.
"Our crews are currently working as fast as they are safely able, to repair the equipment and restore power to the region."
The company said it was still on track to complete the works by 5pm.
The council yesterday urged residents to prepare for the outage, especially those reliant on medical equipment for support.
Residents, who appear to have been given just 24 hours' notice, are also asked to turn off all appliances at the wall, store enough drinking water before the power goes off and fill-up petrol tanks before power is cut as pumps won't work.
Eftpos will also be down. Farmers will also be affected.
Opotiki Mayor John Forbes told NewstalkZB that if anyone started having any issues they should contact the council.
The outage would "make it tough" on those in rest homes and health centres, he said.