Storm Darragh: Risk to energy supply because of storm damage

SONI says that means that three of six large generating units in Northern Ireland have been “forced into extended outage”.

It is not yet clear when the repairs at Ballylumford will be complete.

That has prompted SONI to update its annual winter forecast which assesses the balance between supply and demand.

SONI Director of Operations, Emma Morris, said: “Our latest assessments show that while we still expect there to be sufficient generation to meet consumer demand, assuming the remaining portfolio of conventional generation can be fully utilised, the power system will experience tighter margins for the remainder of the winter period”.

For SONI’s purposes the winter period lasts until March and it expects this month to be “the most onerous period from a capacity margin perspective”.

During winter 2023 Kilroot power station was not operating because its coal-fired generation had been shut down and its new gas-fired units were not ready for use.

Despite fears of supply shortages when Kilroot was off-line, there was only one brief “amber alert”, meaning the buffer between electricity supply and demand was tighter than SONI would have liked.

At that time Northern Ireland was heavily dependent on electricity from GB coming via the Moyle Interconnetor.

It has a GB-NI capacity of 450MW and was providing 440MW at times of low wind generation.