Intense winds hitting velocities of up to 155km/h (96mph) have caused nearly 90,000 properties without power and forced authorities to halt over 100 aircraft departures, according to regional news sources.
The winds are affecting the complete South Island and lower areas of the northern region, according to the national weather agency.
Officials in New Zealand have announced rare severe gust advisories - the top caution category - in core zones including these major districts.
Locals have been encouraged to remain inside, refrain from journeys, and prepare for additional utility disruptions.
Widespread Damage and Emergency Response
This outage is primarily influencing residences predominantly in the southern region, while officials report that energy was being gradually reinstated.
Local media have indicated that in some places homes have lost their roofs, and power lines and trees have been toppled by the winds.
Within the capital, a person was killed after being struck by a falling limb at a frequent walking route on earlier this week.
Meanwhile in Wellington, a individual was blown onto approaching vehicles on a street by a powerful blast, in a moment that was captured in a popular vehicle recording.
Flights to and from the city have been cancelled because of the weather, whereas certain highways and community centers are shut down.
At the same time local leaders have issued a state of emergency, to facilitate emergency management operations.
Labor Protests During Severe Conditions
The powerful gales on Thursday occur while tens of thousands of teachers, doctors and other public workers are engaged in what has been termed a "significant labor action", demanding better pay and working conditions.
Yet the extreme weather has forced them to modify some of their plans, with several external protests moved indoors or cancelled.
Similar gusts are impacting the neighboring country, bringing a heatwave to the nation's interior regions.
Officials have announced flame prohibitions for concern about bushfires.