Power has been restored to over 12,200 customers in the Shannonside region.
The ESB says a fault this morning at the Athlone station caused three substations to trip – Roscommon Town, Ballygar and Glenamaddy.
Phone and internet networks were also down in a number of areas today.
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Power was restored gradually throughout the day as crews worked through the system and full service was restored to all areas by four o’ clock this afternoon.