With 715,000 homes, farms and businesses without power as of 8:00a.m today (Friday, January 24) due to Storm Éowyn, ESB Networks has warned that some power restoration will take a "significant number of days".
The damage to electricity infrastructure so far has been "unprecedented" and "widespread", according to the ESB.
This comes as the whole country has received a Status Red weather warning, with "danger to life", according to Met Éireann.
While some counties will enter a Status Orange warning this afternoon, warnings will remain in place for most of the day, with more power outages expected as the storm tracks northwards.
ESB Networks continue to closely monitor the storm impact on power supplies and all available resources stand ready to mobilise once safe to do so.
Given the extent of the damage nationwide, estimated restoration times (ERTs) will only be provided once teams have assessed network faults and these will then be available to view throughout tomorrow (Saturday, January 25) on the ESB power check website.
Customer contact centre agents will be supporting customers throughout Storm Éowyn, but will not be in a position to provide outage information until the network assessment has been fully conducted.
The ESB has asked members of the public to report any damage to electricity infrastructure by calling 1800 372 999, and to never touch or approach the wires.
Meanwhile, gardaí have also asked the public to "stay safe" and within shelter throughout the storm.
On social media, superintendent garda press officer, Liam Geraghty, said: "Storm Éowyn is a dangerous, damaging and destructive weather event with potential serious risk to life and injury for people who do not follow the safety advice."
The Department of Agriculture, Food and the Marine (DAFM) is also urging everyone to follow closely to the advice of the authorities, noting that farmers should check that buildings and loose objects are secure.