Winds of up to 143kmph were recorded.
ESB is working to restore power to 194 thousand homes, farms and businesses after Storm Ellen.
Severe flooding has been reported in West Cork with fallen trees and debris across the country.
Meanwhile, a status yellow rain warning for the entire country is now in place until 5am tomorrow morning.
When I say I screamed. Douglas #Cork now #StormEllen @CorkSafetyAlert pic.twitter.com/ouOzfeF6J9
— Padraig (@Padraig_WMC) August 19, 2020
Cork was one of the worst affected counties with gusts last night of 143 kilometres per hour recorded at Roches Point.
ESB's Derek Hynes said Munster was hit hardest.
''What we see this morning is that the counties most effected were in line with the Met Eireann forecast'', he said.
This shouldn’t be happening in Skibbereen.Millions spent on flood protection.The entire town should be dry even in this intense rainfall. Part of me is not surprised. The flood committee flagged that this area needed more protection.OPW need to provide answers. #StormEllen pic.twitter.com/pPr061LOz9
— Christopher O’Sullivan TD (@COSullivanTD) August 19, 2020
''They were Cork, 40,000 without power, Tipperary 35,000, Westmeath 20,000, Longford 15,000, Limerick 12,000, Roscommon and Galway about 8 thousand each''.