Underground powerlines aren't the solution for dealing with Mother Nature in Auckland.

During this month's violent storm, countless trees fell onto powerlines, knocking out electricity to tens of thousands of homes and businesses.

It's prompted discussion about whether the expensive task of shifting overhead powerlines underground, would be worth the cost.

AUT Senior Lecturer in Electrical Engineering David Nutt says undergrounding presents its own problems.

"There's always an earthquake risk in New Zealand and overhead lines fair much better than overhead lines in an earthquake situation because if a flag rocks about a bit, it's much easier to deal with than a break underground where you don't even know where it's happened."

He thinks that the anger at Vector over the mass power cut was unwarranted.

Nutt says there's nothing more Vector could have done to get power back on any faster.

"They brought in a lot of people from outside of the area. They prioritised very well, they tried to get things on in the right order, but when you've got 1,000 jobs to do, you can't simply conjure up 1,000 people to deal with them."

The final few households and businesses who lost electricity have now had their power restored.

The company says restoring power to180,000 Auckland customers was the worst they've had to deal with.

Vector CEO Simon MacKenzie says he completely understands the frustrations from customers.

He says their usual channel for customers to report outages did not perform in the circumstances.

"When we have a storm of this magnitude, it just basically didn't cope. It generated response times that caused frustration and got overloaded."