Up to 3,000 homes and businesses are without power in the Longford and Roscommon area after a large electricity supply fault.
Shops and businesses have closed early for the day in several towns across the region as a result.
The fault, which occured at a "medium voltage substation", initially affected 7,000 customers.
ESB Networks crews are working to repair the fault but the electricity provider says supply may not be returned until later this evening.
We have a large fault in the #Longford #Roscommon areas initial ert is 19.45 see https://t.co/VMtxFrW7FY Apologies
— ESB Networks (@ESBNetworks) March 27, 2017
