Oireachtas Joint and Select Committees

Tuesday, 30 August 2022

Joint Oireachtas Committee on Climate Action

Energy Supply and Security: Discussion

Mr. Rodney Doyle:

That is a good explanation. I will deal with the plant reliability piece. It is a positive that the plants that were on outage are returning and we talked about Great Island and Dublin Bay earlier on. We hope that some other plants will come back before the winter starts, plants which have used their outages to get their maintenance done to put themselves in a good position for the winter.

On ageing plant, as one would expect, the older the plant the less reliable the supply would become. The forced outage rate - which is a rate we look at to determine whether one would expect the plant to go off the system or not and whether it was a planned or forced outage - has increased over the past number of years as plants have aged. We understand that when we are planning the system, so we factor that in to our plans then for the coming winter. When we look at the winter to come, we factor in what that means as to what we might perceive to be a gap between demand and supply at any one time. We try to maintain a buffer between demand and supply at any one time and if plant is not available, then that would eat into the buffer we have. That is when one would see things like alerts.

An alert on the system is a signal to the system to say that the buffer between supply and demand has been decreased. That is what an amber alert indicates to the system. We are trying to maintain that as best we can and then will we will do trading with our colleagues across the water to try to maintain that buffer.

Returning to the point that as we come into this winter, if plant goes off the system or if we have low wind days, then that will put more pressure on the system and that heightens the risk to the supply.

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