ESB crews have been mobilised to restore power to over 12,200 customers in Roscommon town, Ballygar and Glenamaddy.
A spokesperson for the ESB says a fault fed through the network in Athlone has caused the outage which was first reported just after 9 o'clock this morning.
The areas affected include Roscommon town, Ballygar and Glenamaddy.
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The ESB says crews hope to have power restored to the area by 12 noon.