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New provisional figures from EirGrid indicate that 43% of Ireland’s electricity in October 2025 came from renewable sources.
Wind energy was the dominant contributor, supplying 36% of total electricity, while grid-scale solar accounted for around 2%. Total wind generation reached 1,073 GWh in October, up from 920 GWh in September. Overall electricity demand for the month stood at 2,969 GWh, slightly higher than September.
By comparison, official metered data from October 2024 showed system demand of 2,877 GWh, with 41.5% of electricity sourced from renewables, including 35% from wind and 1.1% from grid-scale solar. Gas generation provided 39% of electricity last month, and imports via interconnectors made up 16%.
EirGrid recently published its Winter Outlook for 2025/26, covering 3 November 2025 to 5 April 2026, which informs the electricity sector and helps plan for the winter months. The report highlights that a 1°C drop in temperature typically drives a 55 MW increase in peak electricity demand, demonstrating the impact of weather on system use.
Diarmaid Gillespie, Director of System Operations at EirGrid, commented: "Wind energy accounted for the majority of renewable generation in October, with total generation from wind energy amounting to 1,073 GWh (Gigawatt hours) over the month.
"As we would expect at this time of year, we saw an increase in demand for electricity as we head into the colder months and darker evenings. We recently released our Winter Outlook, which forecast that there will be adequate generation capacity and a reduced risk of system alerts in the coming months."
