ESB crews are working to restore power to homes in Dublin and on the west coast.
The blackouts are because of the latest storm to batter the country.
Met Éireann says its keeping its status orange weather warning in place until lunch time and Irish Ferries has cancelled it's Swift sailings today.
Meanwhile in the US, temperatures are plummeting.
Forecasters say Chicago could see some of its coldest weather ever today, with lows of minus 23 degrees.
US authorities have warned residents to stay indoors and stock up on food as the Northwest of the country is blanketed in snow.
A state of emergency was declared in New York and New Jersey after heavy flurries last Thursday.
