Severe gusts attaining speeds of approximately 155km/h (96mph) have left nearly 90,000 homes experiencing outages and forced officials to cancel more than 100 aircraft departures, based on local media.
The gales are affecting the whole South Island and lower areas of the northern region, according to the weather forecasting body.
New Zealand authorities have announced uncommon red wind warnings - the most severe warning - in core zones encompassing Wellington and Canterbury.
Residents have been advised to avoid going outside, refrain from journeys, and get ready for more electricity and network failures.
Widespread Destruction and Crisis Measures
The power cut appears to be affecting households mainly in the southern region, while officials state that power was being gradually reinstated.
Regional news have stated that in some places structures have suffered roof damage, and utility poles and vegetation have been brought down by the gusts.
Within the capital, a man was killed after being hit by a falling limb at a frequent walking route on earlier this week.
Also in the capital, a woman was swept into moving cars on a road by a intensive burst, in a incident that was captured in a viral dashcam video.
Flights entering and leaving the metropolis have been suspended because of the gusts, while various routes and public facilities are shut down.
Meanwhile authorities in Canterbury have issued a crisis declaration, to support disaster response efforts.
Labor Protests Amid Severe Conditions
These intense gusts on this day coincide with tens of thousands of teachers, doctors and other public workers take part in what has been described as a "mega strike", requesting better pay and working conditions.
Yet the severe conditions has forced them to alter some of their plans, with some outdoor rallies relocated inside or called off.
Like conditions are also sweeping the nearby nation, causing a high-temperature event to the remote areas.
Authorities have announced flame prohibitions for concern about bushfires.
