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.
Speaking on BBC Radio Ulster's Good Morning Ulster programme, Aoife Kealy from Met Éireann says the "eye of the storm, at the moment, is centred just north of Ireland, and it is going to move off towards Scotland now in the next few hours".
Ireland's national weather service says the country has seen 114 mph wind gusts, the highest ever recorded on the island.
Storm Éowyn has begun battering Northern Ireland, bringing with it winds of more than 90mph and leaving 93,000 homes and businesses without power. Northern Ireland has seen the highest gust in 27 years.
Rail services and flights have been axed, with rare red weather warnings issued for Scotland and Northern Ireland. The Met Office extended its rare red weather warning at 11am to cover more of Scotland until 5pm, while Northern has issued a 'do not travel' warning for much of the north, including Greater Manchester.
Met Éireann, the Republic of Ireland's national meteorological service, said that the country had faced wind gusts of 114mph in County Galway– the highest recorded wind speeds ever recorded on the island.
Met Éireann forecasts extremely destructive gusts in excess of 130km/h with many schools and workplaces set to close
Met Office weather warnings are in place across the UK today and will continue until Tuesday after Storm Eowyn's disruption. Thousands of homes and businesses across Ireland are without power after it saw record-breaking wind speeds yesterday.
Winds reached 100mph as Storm Eowyn left one person dead, more than a million people without power and caused significant travel disruption across the UK and Ireland. Rail services, flights and ferries have been cancelled across the country as rare red weather warnings are in place on Friday in Scotland.
Across the border Met Eireann has issued a rare nationwide red warning for wind across the Republic of Ireland. A Met Office spokesperson said peak rush hour wind speeds of 80-90 miles per hour are expected across Northern Ireland, with up to 100mph in some exposed locations.
Further support has been promised from London as work continues to repair damage caused across Northern Ireland by Storm Eowyn. On Sunday evening, more than 75,000 people remained without power and work continued to clear fallen trees from roads.