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.

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Power was expected to be restored in South Auckland at 11.30pm.