ESB Networks in Ireland and NIE Networks say they expect significant further outages as Storm Eowyn continues to batter parts of the island.
A red wind warning has been issued for the whole of the Republic of Ireland, with Met Éireann warning of a possible "danger to life". The alert comes into effect at varying times from 02:00 on Friday and will end at varying times. Met Éireann has warned that "severe, damaging and destructive winds" are expected, with gusts of up to 130km/h.
Storm Éowyn is slowly making its way across the UK, where its heavy winds have been hitting homes and commercial properties. In Northumberland, one bungalow had its roof torn off, while Bangor leisure centre in Northern Ireland - which is under a red wind warning - also suffered damage.
There are warnings of danger to life, fallen electric lines, damaged infrastructure and widespread power outages
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Millions of people have been urged to stay at home on Friday as Storm Éowyn is set to bring potentially life-threatening winds to the north and west of the UK.
Ireland bore the brunt of the storm first, hit with wind gusts up to 114 mph, the strongest since World War II.
A man has died after a tree fell on his car in Ireland, as Storm Eowyn broke wind speed records on the British Isles. The incident, which took place at 5:30am at Feddyglass in Raphoe, is the first confirmed death in the storm which saw wind speed top 114mph in Ireland.