More than 715,000 properties are without power in the Republic of Ireland as Storm Éowyn causes chaos across the island.
Gardaí (Irish police) are also investigating a possible weather link to a serious road incident in Donegal, near the border with Northern Ireland.
It happened on the N14, north of Lifford, near Ballinalecky Cross, but conditions are so treacherous that Gardaí have not been able to reach the scene.
They are also warning people not to travel unless absolutely necessary as there may be fallen trees across the country as well as fallen or damaged live electricity wires.
Electricity infrastructure
In Donegal alone, 86,000 households were left without electricity on Friday morning.
ESB Networks described the storm as "record-breaking" and said it had never experienced so many power cuts in the country before with any extreme weather event.
It said there was extensive damage to electricity infrastructure but that their crews would only start restoring power when it was safe to do so.
"Given the predicted extent of the damage nationwide, we anticipate restoration will take a significant number of days," ESB said.
Storm breaks Irish wind speed records
A wind speed of 183kmh (114mph) brought by Storm Eowyn has been recorded in the Republic of Ireland, the fastest since records began, Irish forecaster Met Éireann said.
Met Éireann said a gust of 183kmh had been recorded at Mace Head, County Galway, at about 05:00 local time on Friday, just above the previous record high of 182kmh (113mph) set in January 1945 in Foynes, County Limerick.
It also reported the mean wind speed record of 131kmh (81mph) set in 1945 in Foynes has been broken during the storm, with up to 135kmh (84mph) at Mace Head at 04:00 local time.
