Severe gusts reaching speeds of up to 155km/h (96mph) have caused approximately 90,000 households experiencing outages and forced agencies to call off over 100 flights, based on local media.
The gales are impacting the complete South Island and southern sections of the northern region, according to the national weather agency.
Officials in New Zealand have announced infrequent red wind warnings - the top caution category - in core zones encompassing Wellington and Canterbury.
People have been advised to stay indoors, refrain from journeys, and prepare for more utility disruptions.
Widespread Impact and Emergency Response
The electricity loss seems to be impacting homes mainly in the South Island, though officials report that energy was being gradually reinstated.
Domestic outlets have reported that in certain areas homes have lost their roofs, and trees and electricity poles have been brought down by the gusts.
Across Wellington, a man was killed after being struck by a tree branch at a frequent walking route on earlier this week.
Also in the capital, a woman was swept into moving cars on a thoroughfare by a powerful blast, in a moment that was filmed in a widely shared car camera footage.
Flights entering and leaving the city have been halted due to the gusts, whereas various routes and public facilities are shut down.
Simultaneously local leaders have issued a crisis declaration, to assist emergency management operations.
Strike Action Alongside Extreme Conditions
These intense gusts on this day occur while tens of thousands of educators, medical professionals and government employees take part in what has been called a "significant labor action", calling for improved salaries and workplace environments.
However the severe conditions has compelled them to change some of their plans, with some outdoor rallies moved indoors or abandoned.
Comparable winds are affecting Australia, bringing a heatwave to the remote areas.
Agencies have announced burning restrictions for fear of wildfires.
