Intense gales reaching speeds of up to 155km/h (96mph) have caused around 90,000 homes experiencing outages and compelled officials to cancel over 100 flights, according to local media.
The winds are affecting the whole South Island and southern sections of the North Island, according to the national weather agency.
New Zealand authorities have issued uncommon severe gust advisories - the highest alert level - in central regions encompassing these major districts.
Residents have been encouraged to remain inside, refrain from journeys, and prepare for more utility disruptions.
Widespread Impact and Emergency Measures
This outage is primarily influencing households mainly in the southern region, while authorities state that the electricity supply was being restored progressively.
Local media have reported that in some places structures have suffered roof damage, and power lines and trees have been knocked down by the gales.
In Wellington, a person was killed after being struck by a tree branch at a popular trail walking spot on Tuesday.
Also in the capital, a individual was swept into approaching vehicles on a street by a strong gust of wind, in a moment that was filmed in a widely shared car camera footage.
Aircraft services in and out of the urban area have been cancelled due to the winds, while various routes and public facilities are also closed.
Meanwhile Canterbury officials have declared a crisis declaration, to support disaster response efforts.
Work Stoppages During Harsh Conditions
The wild winds on Thursday come as numerous of school staff, physicians and civil servants take part in what has been termed a "mega strike", demanding better pay and working conditions.
However the intense climate has compelled them to change some of their plans, with several external protests moved indoors or called off.
Comparable winds are also sweeping the neighboring country, ushering in a high-temperature event to the nation's interior regions.
Authorities have issued burning restrictions for apprehension regarding bushfires.
