Severe gusts hitting speeds of as high as 155km/h (96mph) have resulted in nearly 90,000 households experiencing outages and forced authorities to halt in excess of 100 flights, according to local media.
The winds are affecting the entire South Island and southern parts of the North Island, per the country's meteorological service.
New Zealand authorities have issued uncommon high-level wind alerts - the highest alert level - in key areas including Canterbury and Wellington.
Residents have been urged to remain inside, avoid travel, and make arrangements for more utility disruptions.
Widespread Impact and Emergency Response
The electricity loss appears to be affecting homes predominantly in the southern region, although officials state that power was being restored progressively.
Local media have reported that in some places structures have suffered roof damage, and utility poles and vegetation have been toppled by the gales.
Within the capital, a man was killed after being struck by a wooden fragment at a popular trail walking spot on Tuesday.
Also in the capital, a female was blown onto moving cars on a street by a strong gust of wind, in a incident that was captured in a viral dashcam video.
Aircraft services to and from the metropolis have been halted because of the weather, while various routes and public facilities are also closed.
Simultaneously local leaders have declared a crisis declaration, to facilitate disaster response efforts.
Work Stoppages Alongside Severe Weather
The wild winds on Thursday coincide with many of teachers, doctors and other public workers are participating in what has been called a "mega strike", calling for better pay and working conditions.
However the extreme weather has pressured them to modify some of their plans, with various open-air gatherings moved indoors or called off.
Comparable winds are affecting Australia, bringing a heatwave to the remote areas.
Agencies have announced fire bans for fear of wildfires.
