Around 150 customers are still without power more than a week after a major storm battered Taranaki and Whanganui.
Roofs were ripped off, windows smashed, trees knocked down and power was lost in several areas on March 3.
Power was cut to about 30,000 customers, but has since been restored to all but around 150 today Powerco says.
Powerco network operations manager Phil Marsh says the storm damage was the worst the company had experienced.
A huge amount of rebuilding was required in rural and hard to access areas, with about 600 overhead lines brought down and a large number of poles damaged.
Mr Marsh says the storm is a timely reminder for homeowners to ensure their trees are kept trimmed and clear of powerlines - especially in remote locations, where power cuts are tricky to repair.
It is important customers use a professional tree trimming company because of safety issues around trimming trees near power lines, Powerco says.
The company is extending its rural tree trimming campaign until the end of the month.
For each trimming a tree owner pays for, Powerco will donate $100 to a school of their choice.
NZN