Almost 1300 homes are without power on Auckland's North Shore with Vector estimating it could be midnight before power is restored.
It was understood a damaged electricity line was causing the outage to 1280 homes in the Castor Bay area.
The outage happened about 9pm.
A further 30 households were also without power in Papatoetoe following an outage at 8.30pm.
Power was expected to be restored in South Auckland at 11.30pm.