Hundreds of businesses and homes in Letterkenny are still without electricity this morning.
The ESB reported that as of 11.47am today, Wednesday, 291 customers were affected by the outage.
The numbers of affected areas have been reduced from earlier this morning, when ESB reported that 988 customers had been affected.
ESB Network technicians are investigating the cause of the outage, which was centred around Ballyraine.
ESB reported that they expect power to be fully restored by 12.30pm today.