HALF OF IRELAND’S grid-scale electricity generated in 2025 came from renewable sources.
However, there was wide variation on a daily basis in the renewable generation share, largely due to differences in wind generation.
The Central Statistics Office (CSO) today released figures on electricity supply by source in 2025.
The electricity supply in the figures refers to output from main activity producers, whose primary activity is the supply of electricity to the grid for sale to other parties.
It does not include all supply from autoproducers who generate electricity primarily for their own use, such as generation from rooftop solar panels.
CSO infographic on electric supply in 2025 CSO
CSO
Gas was the largest energy source for electricity generation, responsible for 47% of generation.
Wind came in second and was the largest renewable source, providing 40% of generated electricity.
There was a 3% increase in electricity generated from wind last year when compared to 2024.
In winter, a higher share of electricity is generated from wind than in summer, due to typically higher mean wind speeds.
In 2025, February had the highest monthly share of electricity supply from wind at 49% of total supply, whilst May had the lowest at 22%.
However, May had the highest amount of solar electricity generation in 2025.
On a daily basis, the highest renewable generation share in 2025 was 86% on 23 February, the lowest was 11% on 20 January, again largely due to differences in wind generation.
Moreover, electricity generation from grid-scale solar farms was 1,101 GWh in 2025, a 51% increase compared with 2024.
Gigawatt-hours (GWH) are often used as a measure of the output of large electricity power stations.
Overall, grid-scale solar farms made up 4% of generated electricity in 2025.
But while half of Ireland’s grid-scale electricity generated last year can from renewable sources, this is still someways off the target of 80% renewable energy in electricity by 2030.
Electricity generation meanwhile from coal-fired power stations was 52% less last year when compared with 2024, and in June 2025, Ireland stopped all generation of electricity from coal.
Meanwhile, net imports of electricity accounted for 17% of total supply last year. In 2023, net imports of electricity were 3,275 GWh, which contributed 10% of total supply.
Net imports of electricity rose by 21% compared with 2024, and by 87% when compared with 2023.
Ireland’s electricity grid supply grew by 3.5% to 35,884 GWh in 2025 when compared with 2024. The increase in supply largely came from increases in net imports of electricity.
Elsewhere, the peak monthly average supply time was from 5pm to 6pm in November 2025, with the lowest average monthly supply was between 4am and 5am in June 2025.