Ireland hasn't mined any coal in 35 years, this plant was not operating on domestic resources to begin with.
Anyway your actual problem are data center buildouts that are causing demand to skyrocket. They've gone from 5% of your electrical demand to >20% in less than a decade, and are the primary cause of your electricity crunch.
And even when we did mine coal, it was a small amount, and this plant never received any of it. It was designed from the start to run on imported coal, brought in on ships, and did not even have a rail connection.