The interconnector has been out of commission since September
EirGird says the East West Interconnector will begin operating again tomorrow, two months ahead of schedule.
The interconnector - which links the British and Irish electricity grids - has been out of commission since equipment at the converter station in Meath was damaged in September.
EirGrid originally estimated it would not be up-and-running again by the end of February.
In a statement today, EirGrid says: "Following the successful completion of equipment tests, the converter station will be back up and running tomorrow, two months ahead of schedule.
"While the interconnector plays an important role in transferring power to and from the UK, EirGrid can confirm that there have been no issues regarding supply of electricity due to this issue over the past three months," it adds.
Yesterday, there was a mixed response to the news that An Bord Pleanála granted planning approval for a controversial North South interconnector.