Severe gusts hitting speeds of up to 155km/h (96mph) have resulted in around 90,000 properties without power and forced authorities to halt more than 100 flights, according to domestic outlets.
The winds are affecting the whole South Island and lower areas of the North Island, as stated by the country's meteorological service.
New Zealand authorities have released infrequent severe gust advisories - the highest alert level - in key areas encompassing Wellington and Canterbury.
Residents have been advised to avoid going outside, stay off roads, and make arrangements for more electricity and network failures.
Widespread Impact and Crisis Measures
The power cut is primarily influencing residences predominantly in the South Island, while authorities state that power was being restored progressively.
Local media have stated that in certain areas structures have suffered roof damage, whereas power lines and trees have been knocked down by the winds.
Across Wellington, a individual was fatally injured after being struck by a falling limb at a popular trail walking spot on Tuesday.
Meanwhile in Wellington, a individual was blown onto moving cars on a road by a intensive burst, in a event that was captured in a viral dashcam video.
Flights to and from the city have been halted because of the weather, while some roads and libraries are shut down.
At the same time local leaders have announced a crisis declaration, to facilitate emergency management operations.
Labor Protests During Harsh Conditions
The wild winds on Thursday come as tens of thousands of teachers, doctors and other public workers are engaged in what has been called a "mega strike", demanding higher wages and enhanced employment terms.
However the extreme weather has forced them to change certain arrangements, with some outdoor rallies relocated inside or abandoned.
Comparable winds are also sweeping the nearby nation, causing a period of extreme heat to the country's outback.
Authorities have announced burning restrictions for fear of bushfires.
