Powerful winds reaching velocities of as high as 155km/h (96mph) have left around 90,000 households without power and forced agencies to call off over 100 flights, based on domestic outlets.
The gales are influencing the entire South Island and southern parts of the northern region, according to the national weather agency.
New Zealand authorities have released rare severe gust advisories - the highest alert level - in key areas including Wellington and Canterbury.
People have been advised to stay indoors, avoid travel, and prepare for further electricity and network failures.
Widespread Impact and Emergency Response
This outage appears to be affecting residences mostly in the South Island, though officials state that power was being gradually reinstated.
Regional news have reported that in various locations homes have lost their roofs, and trees and electricity poles have been toppled by the gusts.
In Wellington, a person was fatally injured after being struck by a falling limb at a popular trail walking spot on Tuesday.
Also in the capital, a female was blown onto oncoming traffic on a road by a strong gust of wind, in a moment that was recorded in a viral dashcam video.
Flights in and out of the urban area have been halted because of the winds, whereas certain highways and community centers are shut down.
Meanwhile Canterbury officials have declared a state of emergency, to assist disaster response efforts.
Work Stoppages Amid Severe Weather
The powerful gales on today coincide with many of teachers, doctors and other public workers take part in what has been described as a "significant labor action", demanding improved salaries and workplace environments.
However the intense climate has compelled them to modify various scheduled activities, with some outdoor rallies shifted to interior venues or called off.
Similar gusts are impacting the neighboring country, bringing a heatwave to the country's outback.
Authorities have announced burning restrictions for fear of forest fires.
