Severe weather has caused flooding and uprooted trees across Northern Ireland.
A man was taken to hospital after a tree fell on his mobile home
Driving conditions are treacherous with many roads closed.
At one stage, about 68,000 homes were without power. Supplies have now been restored to more than 50,000 of these households.
Counties Down and Armagh were worst affected, particularly Downpatrick, Newry and Craigavon.
Northern Ireland Electricity spokeswoman Julie Carson said engineers were working to repair damaged power lines.
"We have over 400 engineers, linesmen and call handlers reinforcing our ability to restore supplies as quickly as possible," she said.
"Damage has been caused by trees and branches down across lines, and by flying debris which has caused damage to poles and other equipment."
Staff from the river, roads and water agencies have been working overtime to deal with emergencies.
A man had to be rescued after he was trapped when a tree fell on his mobile home in the village of Blackskull, near Dromore in County Down.
Joe Topley, 36, was in bed when the tree crashed through his bedroom and pinned him down.
He was freed by neighbours and the Fire Service, and taken to hospital where he was treated for a leg injury.