Thousands of homes and business are with out power in Auckland, Whangārei and Kaipara and Northland.
About a quarter of Northpower's customers are without power right now, Northpower chief executive Andrew Mcleod told Checkpoint.
The lines company covers the Kaipara and Whangārei districts.
"We've got about 15,000 families off at the moment," he said.
"Really difficult conditions up here. very high winds, very wet. We've had about 150 people... construction crews out there just working continuously to fix things, but as quickly as we can fix them, we're finding that we're getting more damage behind us.
"A lot of that is trees... wet, high winds, trees are just falling over, straight through our lines," he said.
