Intense gusts reaching speeds of up to 155km/h (96mph) have resulted in approximately 90,000 properties experiencing outages and compelled authorities to cancel more than 100 air travel services, as reported by domestic outlets.
The gales are affecting the entire South Island and lower areas of the northern region, according to the country's meteorological service.
Officials in New Zealand have released infrequent severe gust advisories - the most severe warning - in key areas including Wellington and Canterbury.
People have been urged to stay indoors, refrain from journeys, and prepare for additional utility disruptions.
Extensive Damage and Crisis Response
The power cut is primarily influencing households predominantly in the South Island, while authorities report that power was being slowly brought back.
Domestic outlets have stated that in various locations homes have lost their roofs, whereas trees and electricity poles have been knocked down by the winds.
Within the capital, a person was fatally injured after being struck by a tree branch at a frequent walking route on earlier this week.
Meanwhile in Wellington, a female was blown onto moving cars on a road by a powerful blast, in a incident that was captured in a widely shared car camera footage.
Flights to and from the urban area have been suspended because of the weather, and certain highways and community centers are also closed.
Meanwhile Canterbury officials have announced a crisis declaration, to assist emergency management operations.
Work Stoppages During Harsh Weather
The powerful gales on Thursday occur while tens of thousands of teachers, doctors and other public workers are participating in what has been termed a "significant labor action", demanding better pay and working conditions.
But the intense climate has compelled them to modify some of their plans, with some outdoor rallies shifted to interior venues or abandoned.
Like conditions are also sweeping the neighboring country, ushering in a heatwave to the remote areas.
Officials have issued fire bans for apprehension regarding wildfires.
