The tree had fallen on Glenaby Road on the outskirts of Lisburn.
Thousands of homes in Northern Ireland remain without power after Storm Isha caused severe disruption.
The NIE said the storm caused widespread damage to Northern Ireland’s electricity network.
The Police Service of Northern Ireland (PSNI) announced that many roads across Northern Ireland remained impassable on Monday.
The newspaper said officers responded to about 600 calls related to the storm between 3:30pm GMT on Sunday and 2am on Monday.
About 40,000 customers were without power as of 7:30 a.m. Monday, according to NIE Networks.
The latest figures show around 235,000 homes and businesses in the Republic of Ireland are without power.
PSNI Chief Superintendent Davey Beck said: “There continues to be a significant debris risk on the road network” and urged road users to “take extreme caution”.
“Wide-spread disruption”
Colin Sykes, from the Department for Infrastructure, said it had been a “very difficult night” as they had to deal with more than 1,000 incidents.
He told BBC News NI: “930 of those were reports of trees and branches falling across roads, so there is widespread disruption across the road network.”
One of County Antrim’s historic Dark Hedge trees fell overnight.
He said the ongoing industrial action was “disrupting our ability to provide services”.
“However, given how dangerous the situation became last night, it has become increasingly difficult to respond on the streets,” he continued.
Sykes said the department had contingency plans in place, including reassigning other staff and using private contractors.
It added that this would mean a “slower response” but that it would “start working on all priority routes and unblocking them where possible.”
Belfast International Airport managing director Graham Keddie said Sunday had been a “difficult” day for the team, but most planes had landed and the airport was back to “virtually normal operations” on Monday.
Translink has announced that a tree has fallen on the Lisburn line, causing delays and disruption to the line from Portadown to Bangor.
It added that all rail lines would be disrupted on Monday morning due to the exceptional weather. Click here for the latest travel information.
image source, Liam McBurney/Pennsylvania
The car, located on Lisburn Road in Belfast, was badly damaged in the storm.
In County Londonderry, the PSNI said Ballykin Road near Dungiven and Seacoast Road in Limavady were closed due to obstructions caused by fallen trees in the area.
The PSNI said multiple agencies continue to deal with the aftermath and recovery of Storm Isha and thanked the public for their “continued patience and understanding”.
Many schools are closed on Monday. They are Nettlefield PS in Belfast, St Mary’s PS in County Tyrone, and Killinquay PS and Meadowbridge PS in County Down.
A yellow weather warning for strong winds will end at midday on Monday, following a previous yellow warning.
Another yellow wind warning will be in place from 16:00 on Tuesday until 12:00 on Wednesday.
In the Republic of Ireland, a status yellow alert is in place for counties Clare, Donegal, Galway, Leitrim, Mayo and Sligo until 7pm on Monday.
Analysis: BBC News NI Weathercaster Angie Phillips
The brunt of the strong winds was felt in the north, west and south-east of Killowen, County Down.
The peak of Storm Isha’s winds occurred on Sunday evening. 80mph in McGilligan, County Londonderry, 120mph in Castlederg, County Tyrone and 126mph in Killowen.
Although the peak winds have passed, a yellow warning for strong winds on Monday is currently in effect this morning, but it looks like this warning will be extended.
Wind gusts of 50 to 60 mph could still be seen towards the north coast late Monday, with gusts possibly as high as 40 to 50 mph elsewhere, with disruption still possible. there is.
Debris removal efforts began Monday morning.
Escalated response
NIE Networks’ Claire Scullion said 53,000 customers were without power at the peak.
“The strength of the gusts and sustained natural conditions over several hours caused significant damage and flying debris,” she told BBC News NI’s Good Morning Ulster programme.
“Falled trees and weather conditions made repairs extremely difficult overnight. We ask the public to stay away from downed utility poles, overhead lines and damaged electrical equipment.”
NIE Networks said the worst affected areas were Dungannon, Downpatrick, Enniskillen, Newry and Omagh, but added: “There are fault lines across Northern Ireland.”
If you experience a power outage or damage to the power grid, you can report it to the NIE Network Customer Helpline on 03457 643 643.
A clock tower collapsed in Galway’s Eyre Square on Sunday as a result of Storm Isha.
The disruption affected thousands of air passengers across the UK and Ireland.
Among the flights diverted from Belfast International Airport on Sunday was a plane from Bulgaria carrying a group including 19 pupils and three teachers from Mill Strand Integrated Primary School in Portrush.
Principal Philip Reid said the plane experienced “extreme turbulence” as it attempted to land twice before being diverted to Manchester.
In Belfast city center on Sunday afternoon, police advised pedestrians to avoid the Castle Lane area.
Officers closed Castle Lane at the intersection with Royal Avenue after a member of the public was hit by a falling object and required hospital treatment.
Pedestrians were advised to avoid Castle Lane in central Belfast on Sunday afternoon.