Intense gusts attaining velocities of up to 155km/h (96mph) have caused around 90,000 homes experiencing outages and forced agencies to call off more than 100 air travel services, according to local media.
The gales are influencing the whole South Island and lower areas of the North Island, according to the national weather agency.
The nation's agencies have issued infrequent high-level wind alerts - the most severe warning - in central regions encompassing these major districts.
People have been advised to avoid going outside, avoid travel, and prepare for further electricity and network failures.
Extensive Impact and Crisis Measures
The power cut appears to be affecting households mostly in the South Island, though authorities state that power was being gradually reinstated.
Domestic outlets have reported that in some places roofs have been ripped off houses, whereas power lines and trees have been toppled by the gusts.
Within the capital, a person was fatally injured after being hit by a tree branch at a popular trail walking spot on Tuesday.
Also in the capital, a woman was pushed toward moving cars on a thoroughfare by a strong gust of wind, in a incident that was recorded in a viral dashcam video.
Aircraft services in and out of the metropolis have been cancelled as a result of the gusts, and various routes and public facilities are also closed.
At the same time Canterbury officials have announced a crisis declaration, to assist emergency management operations.
Strike Action Alongside Harsh Weather
The powerful gales on today coincide with many of teachers, doctors and other public workers are engaged in what has been called a "mega strike", requesting higher wages and enhanced employment terms.
Yet the intense climate has pressured them to modify certain arrangements, with several external protests moved indoors or cancelled.
Similar gusts are impacting the nearby nation, causing a high-temperature event to the remote areas.
Authorities have declared flame prohibitions for fear of bushfires.
