Renewable energy sources provided around 41% of Ireland’s electricity in November 2025, according to provisional data from EirGrid, Ireland’s transmission system operator.
The figure marks a significant increase compared with November 2024, when official metered data showed that 34% of electricity came from renewable sources.
Wind power accounted for the largest share of renewable generation, supplying 35% of all electricity used during the month. Total wind generation reached 1,067 GWh, while the overall renewable share rose to 41% when other sources, including grid-scale solar and hydropower, were taken into account.
Gas-fired generation remained the single largest source of electricity, representing 42% of total generation in November. Meanwhile, 17% of electricity demand was met through imports via interconnection.
According to EirGrid, total electricity system demand stood at 3,088 GWh in November, up from 2,969 GWh in October, reflecting higher consumption as colder weather set in and daylight hours shortened.
November also saw a new all-time peak demand record for a Sunday. Demand reached 5,144 MW on Sunday 30 November, surpassing the previous Sunday peak recorded in January 2025.
In addition, a new record for Ireland’s transmission system was set during the month, when battery discharge reached 362 MW at one point on Tuesday 25 November. This occurred during a period of high demand combined with low wind generation.
The record follows a major market update launched last month by EirGrid, SONI and SEMO, which enables battery units—referred to as Energy Storage Power Stations (ESPS)—to be fully integrated into the real-time electricity market. The update allows batteries to charge and discharge electricity more efficiently within the market framework.
EirGrid is responsible for balancing electricity supply and demand every minute of the day from the National Control Centre, while also overseeing the long-term planning of Ireland’s electricity system.
Commenting on the figures, Diarmaid Gillespie, Director of System Operations at EirGrid, said that “As we would expect in November, with the clocks having changed, evenings getting shorter and the weather colder, we continued to see an increase in demand on the system last month.
“Notably we saw the highest demand for a Sunday since January of this year, with batteries playing an ever-increasing role in meeting peak demand on the power system.”