ESB repair crews are working to restore power to more than 6,500 homes and businesses after high winds caused blackouts.
Most of the damage was done in the southern half of the country as an Atlantic storm swept in yesterday and overnight but pockets of Donegal were also badly hit.
— ESB Networks (@ESBNetworks) October 6, 2014
The ESB said it had recorded thousands of outages.
The two areas worst affected were in Blessington, Co Wicklow, and Enniscorthy, Co Wexford, but there were also reports of supplies hit across Cork, Kerry, Waterford and Clare.
Lightning in the West and some customers still out since last nights winds please see https://t.co/SoQMBZAM4e if not listed ring 1850372999— ESB Networks (@ESBNetworks) October 6, 2014
The highest winds were recorded at Roche’s Point in Cork where gusts peaked at 63 knots – the equivalent of 117kph and just shy of hurricane force.
In Dublin, gusts were recorded at around 100kph and Malin Head experienced winds of 90kph.
The travel network did not escape, with thousands of commuters disrupted on their way to work because of trees down and damage to overhead lines on railway routes into Dublin.
There were some disruptions to rail services earlier, but they have now been fixed.
Irish Rail said the lines were cleared by about 8am, with Dart services north and south of the capital back up before 9am but running with delays.
Update: North and Southbound DART and Commuter services now operating with delays up to 15 minutes due to earlier line closure.— Iarnród Éireann #StayHomeSaveLives (@IrishRail) October 6, 2014
The intercity to and from Belfast was also disrupted, along with delays on the commuter services north of the capital.
Elsewhere, a number of planes diverted from Shannon and Cork at the peak of the storm last night while Irish Ferries cancelled two of the fast ferry sailings across the Irish Sea.
ESB Networks had warned customers in some parts of the country to expect to wake up to a power cut but they also urged people to steer clear of damaged lines and to check its online updates before calling to report a fault.
It is expected power supplies will restored throughout the day.
Met Eireann is forecasting further heavy but scattered showers during today.