Intense gales hitting speeds of as high as 155km/h (96mph) have left approximately 90,000 properties without power and forced agencies to call off in excess of 100 aircraft departures, as reported by domestic outlets.
The gales are influencing the entire South Island and lower areas of the northern region, according to the weather forecasting body.
Officials in New Zealand have issued rare severe gust advisories - the most severe warning - in core zones including Wellington and Canterbury.
People have been encouraged to remain inside, refrain from journeys, and make arrangements for additional utility disruptions.
Extensive Damage and Emergency Response
The power cut seems to be impacting residences mostly in the South Island, though authorities report that power was being gradually reinstated.
Domestic outlets have stated that in some places structures have suffered roof damage, whereas power lines and trees have been knocked down by the gusts.
Across Wellington, a person was killed after being hit by a tree branch at a popular trail walking spot on earlier this week.
Also in the capital, a individual was blown onto oncoming traffic on a thoroughfare by a intensive burst, in a moment that was captured in a popular vehicle recording.
Air travel in and out of the city have been halted as a result of the gusts, while some roads and libraries are shut down.
At the same time local leaders have announced a crisis declaration, to facilitate disaster response efforts.
Labor Protests Amid Harsh Conditions
These intense gusts on Thursday come as many of teachers, doctors and other public workers take part in what has been called a "mega strike", requesting higher wages and enhanced employment terms.
However the extreme weather has pressured them to alter some of their plans, with several external protests shifted to interior venues or cancelled.
Comparable winds are affecting the nearby nation, ushering in a heatwave to the country's outback.
Agencies have issued burning restrictions for concern about bushfires.
