The country is braced for more disruption as a second storm approaches Ireland just hours after Storm Isha passed.
ESB crews are working to restore power to around 68,000 homes and businesses across the country following Storm Isha.
As the clean-up continues, a second storm - Storm Jocelyn - is due to bring "severe and damaging gusts" to the country tomorrow.
Met Éireann has issued fresh Status Orange wind warnings for counties Donegal, Galway and Mayo from 6pm tomorrow.
Caution has been advised as people can expect very difficult travelling conditions tomorrow, as well as fallen trees and damage to power lines.
Three people died on the roads during Storm Isha. In Co Louth, a woman in her 20s died following a crash; a man in his 60s died in a crash in Co Derry; and a man in his 40s died in a crash in Co Mayo.
ESB Networks said some customers may be waiting several days for power to be restored, with Storm Isha ranking among the top five most severe in the past decade in terms of damage to the network.
This morning, 235,000 homes and businesses were without power. A significant number have since been restored. However, crews are still working to restore power to 68,000 others.
ESB spokesman Brian Tapley said the arrival of a new storm tomorrow will hamper efforts to restore service, as technicians cannot work at a height during Status Orange or Red warnings.
"We will get a large number of customers back today, but it will be multi-day effort before everyone is back," Mr Tapley said.
However, he added that the next approaching storm will hit the worst-impacted region in the northwest tomorrow.
"That is only going to hamper restoration efforts really and slow us down, and probably we will have new customers out as a result of that.
"Two storms in the space of two days is never good. We would be very concerned," Mr Tapley said.
Across the border, Northern Ireland Electricity (NIE) Networks said around 17,000 customers were still without power this afternoon. At the peak, 53,000 customers were off supply.
Uisce Éireann said around 35,000 customers were hit by interruptions to their water supply following Storm Isha.
The worst affected areas were in Mayo and Donegal.
In a statement, Uisce Éireann said: "Water services staff are working around the country to make the necessary repairs at plants and on the water network."
Met Éireann said gusts of between 133km/h and 137km/h were recorded in counties Donegal and Galway last night. In Kerry, gusts of over 115km/h were recorded at Valentia, while at Cork Airport gusts of 107km/h were recorded.
Isha 'on the upper end' of recent storms
National Director for Fire and Emergency Management Keith Leonard said that the damage has been "extensive" in relation to trees down. He advised people not to attempt to clear debris themselves, especially if they are working alone.
"We have extensive trees down across the country, some spot flooding in areas and really a fair bit of disruption across the country today, but particularly along the west coast and the northwest.
He said that the west was affected most and this was "on the upper end" of the storms in recent months.
At Dublin Airport, 29 flights were cancelled, including 16 arriving flights and 13 departures. This is in addition to the 166 inbound and outbound flights that were cancelled by airlines yesterday.
Head of Communications at daa, Kevin Cullinane, said that about 5% of flights were cancelled today.
Flights resumed at Cork Airport after four inbound and six outbound flights had to be cancelled yesterday, and six flights had to be diverted.
Fifteen flights had to divert to Shannon Airport over the course of Storm Isha between yesterday and early this morning.
Council crews face fallen trees and debris on roads around country
Kerry County Council crews cleared many routes after multiple reports of fallen trees, signage and road debris on the county's roads.
Cork City and County fire brigades and local authority road crews had a busy night with multiple reports of trees down and debris on roads as well as downed power cables leading to difficult driving conditions across the county.
Emergency services responded to a number of road traffic collisions. However, there were no reports of injuries.
Tipperary County Council urged motorists to exercise caution on the roads this morning, as some routes were blocked because of fallen trees. Crews were out for several hours to clear roads which were blocked overnight.
In Waterford, the city and county council's team dealt with fallen trees and branches.
In Wexford there were trees down in the Enniscorthy area and also in Courtown last night, as well as on the road between New Ross and Wexford town.
Debris on the roads also caused problems in Kilkenny and Carlow overnight.
Winds were at their strongest in Co Donegal last night between 7pm and 10pm, and soon afterwards began to ease a little in most areas.
At around 9pm, as many as 10,000 premises were without power in the county, however ESB crews managed to restore power to most by around 11pm.
Donegal County Council Director of Roads and Transportation Bryan Cannon said that the impact of Isha was felt early on yesterday with instances of spot flooding across the county, with many trees falling in advance of the Status Red warning.
He said that homes and businesses suffered significant structural damage and the mobile phone network was disrupted.
Gardaí also reported that some aluminium sheeting blew from the roof of the Finn Valley Centre across the road in Stranorlar in Donegal.
Mayo County Council said there was a "significant number" of fallen trees and branches in multiple locations across the county. Incidents of wave overtopping and flooding were also seen in some coastal areas.
The PSNI said a number of roads were closed across the North early today due to fallen trees.
Wind warnings issued ahead of arrival of Storm Jocelyn
Status Orange warnings will be in place tomorrow from 6pm until midnight for counties Galway and Mayo, and from 6pm until 2am on Wednesday for Donegal.
A Status Yellow warning will be in place for all other counties from tomorrow afternoon until the early hours of Wednesday.
In Northern Ireland, yellow wind warnings will be in place for counties Antrim, Armagh, Down, Fermanagh, Tyrone and Derry, with strong winds expected from 4pm tomorrow until noon on Wednesday.
