Far North lines company Top Energy has discharged its 85 workers at Mangamuka and restored power to 10,000 homes four hours ahead of schedule.
The workers had been removing high-voltage power lines from a damaged pylon teetering on the edge of a cliff and transferring them to new poles.
A spokesperson for Top Energy said the company wanted to restore the power earlier than the previous deadline of 5pm today, given the unknown effects of Cyclone Pam, which is now beginning to whip across the Far North.
The pylon, which was damaged by a 100m-long slip triggered by heavy rain in December, was in the rugged Mangamuka Ranges just north of the point where State Highway 1 crosses the Mangamuka River.
It carried the 110,000 volt cables, which were Kaitaia's only source of power.
"Power is back and running Kaitaia," he said.