Intense winds attaining velocities of approximately 155km/h (96mph) have caused around 90,000 properties without power and led authorities to cancel over 100 air travel services, according to local media.
The gales are influencing the entire South Island and southern parts of the North Island, according to the weather forecasting body.
Officials in New Zealand have issued rare severe gust advisories - the most severe warning - in key areas including Canterbury and Wellington.
Residents have been advised to avoid going outside, refrain from journeys, and get ready for further power and communication outages.
Extensive Impact and Crisis Response
The power cut appears to be affecting households mainly in the South Island, though agencies say that energy was being restored progressively.
Domestic outlets have indicated that in some places homes have lost their roofs, whereas trees and electricity poles have been brought down by the winds.
Within the capital, a individual was killed after being struck by a falling limb at a frequent walking route on Tuesday.
Meanwhile in Wellington, a individual was swept into moving cars on a street by a intensive burst, in a incident that was captured in a viral dashcam video.
Aircraft services to and from the urban area have been halted because of the weather, while some roads and libraries are shut down.
At the same time authorities in Canterbury have issued a crisis declaration, to support emergency management operations.
Work Stoppages Alongside Harsh Weather
These intense gusts on Thursday come as many of teachers, doctors and other public workers are participating in what has been termed a "significant labor action", requesting improved salaries and workplace environments.
But the extreme weather has compelled them to change certain arrangements, with several external protests moved indoors or cancelled.
Like conditions are also sweeping the nearby nation, causing a high-temperature event to the remote areas.
Authorities have announced burning restrictions for concern about bushfires.
