A separate warning is being issued for rain in parts of the South East of the country.
Winds of up to 119 kilometres an hour are being reported as Storm Chandra makes landfall.
Laois, Offaly and Westmeath along with the rest of the country is under a status yellow weather warning until 11 o'clock tonight.
Met Eireann is warning of fallen trees, flooding and hazardous driving conditions, along with a risk of wave overtopping near the coast.
Alan O'Reilly from Carlow Weather says the biggest problem is the rain Chandra is bringing:
The ESB says around 20,000 homes, farms and businesses across the country are currently without power.
122 customers have no electricity between Kilbeggan and Tyrrellspass in Westmeath - there is currently no restoration time.
While an outage has left 511 people without power in Birr - power was scheduled to be returned to these customers for 5.45am this morning but the outage is appearing on ESB Powercheck.
Network crews have been mobilised since first light and are working to assess the damage, make the network safe and restore electricity supply in what are being described as challenging conditions.
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