Intense gusts reaching speeds of as high as 155km/h (96mph) have resulted in nearly 90,000 properties lacking electricity and compelled agencies to cancel in excess of 100 air travel services, according to regional news sources.
The gales are influencing the entire South Island and southern parts of the North Island, according to the national weather agency.
New Zealand authorities have announced rare severe gust advisories - the most severe warning - in core zones such as Canterbury and Wellington.
People have been encouraged to stay indoors, refrain from journeys, and prepare for additional electricity and network failures.
Widespread Damage and Emergency Response
The power cut seems to be impacting residences mainly in the South Island, although agencies state that power was being restored progressively.
Domestic outlets have indicated that in certain areas structures have suffered roof damage, while utility poles and vegetation have been brought down by the winds.
In Wellington, a man was killed after being impacted by a tree branch at a well-known hiking path on Tuesday.
Additionally in the city, a woman was swept into approaching vehicles on a street by a strong gust of wind, in a event that was filmed in a widely shared car camera footage.
Flights to and from the urban area have been cancelled because of the weather, while various routes and public facilities are not operating.
Meanwhile authorities in Canterbury have announced a state of emergency, to facilitate recovery activities.
Strike Action Alongside Extreme Weather
The powerful gales on Thursday occur while tens of thousands of school staff, physicians and civil servants are participating in what has been called a "mega strike", demanding better pay and working conditions.
However the intense climate has pressured them to change some of their plans, with various open-air gatherings moved indoors or cancelled.
Similar gusts are also sweeping the neighboring country, ushering in a high-temperature event to the remote areas.
Agencies have announced burning restrictions for fear of bushfires.
