The first reports of the outage came shortly after 10.30am.
Nearly 100 homes and businesses in Offaly are without power this afternoon.
The ESB has received reports from 90 customers in Clara.
It was first reported shortly after 10.30am this morning, and the fault is expected to be resolved between 2 and 3pm.
A spokesperson from the ESB is apologising for the loss of supply, and says its crews are working to fix the issue.