Power has been fully restored to 1000 homes in Auckland after branches from an overgrown council tree caused a power cut.

A Vector spokesman earlier said they became aware that a line had come down from a pole on Castle St, Grey Lynn, about 2pm today.

He said the damage was caused by an overgrown tree on council land.

The feeder supplying power was immediately shut down as precaution.

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The spokesman couldn't confirm how many homes were affected but said the feeder line supplied power to between 500 and 1000 homes.

By 3pm, crews had managed to "partially" restore the power to the area.

They asked residents who were still affected to register for updates at its outage centre.

"All lines should be treated as live at all times. If you see damaged or downed power lines, please keep a safe distance away and report it to us as soon as possible on 0508 VECTOR."

Just before 7pm Vector confirmed power had been fully restored.