Ireland Sets Solar Record of 1,258 MW Just Before the Eclipse

EirGrid, Ireland's electricity grid operator, recorded a new all-time high of 1,258 MW in grid-scale solar generation on August 11, close to a third of national electricity demand at that moment. The following day, the European solar eclipse cut that output to 8 MW and forced the operator to activate a backup plant.

The new daily record follows a July that was the country's record month for solar generation, according to pv magazine. On August 12, the eclipse drove solar to near-zero levels: EirGrid measured 532 MW at 18:15, 202 MW at 18:45, and 8 MW at the phenomenon's peak, The Irish Times reported. The operator then activated the emergency Tarbert plant (150 MW), and the electricity market operator issued a margin warning to suppliers, which did not escalate to an alert. Wind, the other renewable source, was low, and three large plants were under maintenance, adding further pressure to the grid.

The episode illustrates the variability grid operators face with high solar penetration, a scenario also observed in systems with growing renewables across Latin America and the United States. Ireland has gone from 2 MW of solar capacity a decade ago to more than 2.6 GW, as stated by Climate Minister Darragh O'Brien, quoted by pv magazine; the grid now has more than 8 GW of renewables, some 5 GW added in ten years. EirGrid had forecast the event and estimated a peak of 1,038 MW for the day of the eclipse; the actual record was 1,090 MW at 13:45. The four temporary emergency plants, including Tarbert, cost close to one billion euros. Ronan Power, CEO of Solar Ireland, noted that the eclipse was visible in the country's solar generation curve.

Solar continues to grow in Ireland: July was a record month and developers are expanding portfolios in a market that barely existed a decade ago. The next reference point is EirGrid's August monthly report, which will confirm whether solar capacity continues to break records and how the grid responds to new episodes of variability.

This article was drafted with artificial intelligence assistance from verified sources and reviewed by a human editor before publication.