Nearly 850 customers in Koutu were without power for more than two hours last night after power lines came down on Koutu Rd.
Unison relationship manager Danny Gough said it was unknown what had caused the lines to come down but a "good chunk" of customers were able to be rerouted through other lines while the repairs were carried out.
He said only those in the immediate area would have been without power for two hours.
The outage happened just after 8.30pm and power was restored to all customers by 11.02pm.