Powerful gusts attaining velocities of as high as 155km/h (96mph) have left nearly 90,000 households lacking electricity and forced authorities to halt in excess of 100 flights, according to local media.
The gales are affecting the entire South Island and lower areas of the North Island, according to the weather forecasting body.
New Zealand authorities have issued rare severe gust advisories - the top caution category - in core zones such as Wellington and Canterbury.
Residents have been urged to stay indoors, stay off roads, and make arrangements for further utility disruptions.
Widespread Destruction and Crisis Response
The power cut is primarily influencing homes predominantly in the South Island, although agencies state that power was being restored progressively.
Domestic outlets have reported that in certain areas structures have suffered roof damage, and trees and electricity poles have been brought down by the winds.
In Wellington, a man was killed after being hit by a wooden fragment at a frequent walking route on earlier this week.
Also in the capital, a woman was blown onto moving cars on a street by a intensive burst, in a moment that was captured in a popular vehicle recording.
Air travel in and out of the urban area have been cancelled as a result of the winds, and certain highways and community centers are not operating.
At the same time authorities in Canterbury have declared a state of emergency, to support disaster response efforts.
Work Stoppages Alongside Extreme Conditions
The wild winds on Thursday occur while numerous of teachers, doctors and other public workers are engaged in what has been called a "major walkout", requesting improved salaries and workplace environments.
However the intense climate has pressured them to modify some of their plans, with several external protests shifted to interior venues or abandoned.
Like conditions are also sweeping the nearby nation, bringing a period of extreme heat to the country's outback.
Agencies have declared burning restrictions for apprehension regarding bushfires.
