ESB crews will respond but company warns that overnight outages likely due to the damage done to infrastructure.
Storm Isha winds has caused damage to the electricity network across the country with more than 170,000 homes, farms and businesses without power, the ESB has confirmed.
ESB Networks released an update on the situation faced by many thousands as the full force of Storm Isha hit on Sunday night. As predicted by Met Éireann, many have lost power due to the storm.
It said: "While ESB Networks teams are restoring power where safe to do so, we expect that the number of customers without power will increase as Storm Isha continues to tracks across the country.
"The worst impacted counties are Mayo, Galway, Roscommon and Kerry. Further outages overnight are expected, particularly in the Northwest, with Met Éireann wind warnings remaining in place until the early hours of tomorrow morning.
"ESB Networks continue to monitor the impact of Storm Isha closely, switching customers back remotely where possible. However, due to the extent of damage to the network and adverse weather conditions, the majority of homes, farms and businesses currently impacted will remain without supply overnight," it said.
More below power check chart published by ESB on Sunday night showing outages.

The electricity supplier said its response is underway.
"ESB Networks storm response plans have been in effect since earlier today and crews will mobilise again at first light to assess the damage, making the network safe and restoring electricity supply where safe to do so.
"ESB Networks crews are responding where safe to do so. Given the extent of the storm, estimated restoration times will be updated through the day tomorrow and will be available on www.PowerCheck.ie and www.ESBNetworks.ie as restoration work progresses," said the statement.
The State electricity company also had an important public safety message
"If you come across fallen wires or damaged electricity network, never, ever touch or approach these as they may be LIVE and extremely dangerous," it said.
WATCH LIVE: Storm Isha direction Ireland
To track Storm Isha press the player on the video and you can zoom in and out using the + and - in the top corner.
The company urged the public to report any damage to electricity infrastructure by calling 1800 372 999.
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