8 October 2026
43% of electricity generated by renewables in September with significant contribution from wind energy
Provisional data from EirGrid, the operator and developer of Ireland’s electricity grid, shows that 43% of electricity came from renewable sources in September.1 This compares to 29% in August.
The majority of September’s renewable electricity came from wind with it accounting for 36% of all electricity used last month. Total generation of wind amounted to 1015GWh (Gigawatt hours).
Grid-scale solar accounted for approximately 5% of electricity generated in the month.2 Elsewhere, gas generation accounted for 37% of all electricity used and 19% was imported via interconnection.
The overall electricity system demand stood at 2857 GWh for September, up from 2796 GWh in August.3
EirGrid is responsible for balancing electricity supply and demand every minute of the day from the National Control Centre, while also strategically planning for Ireland’s long-term electricity needs.
Currently, the electricity grid can accommodate up to 75% of electricity from renewable sources at any one time. This is known as the system non-synchronous penetration (SNSP) limit.
EirGrid’s Director of System Operations, Diarmaid Gillespie, said:
“As we would expect as this time of year, we saw a notable change to the fuel mix last month. There was a significant increase on the previous months in the amount of wind generated energy, with it contributing 36% to the overall fuel mix.
“Similarly, we saw a decrease in the amount of solar energy. This follows a record-breaking summer for solar energy in Ireland but is nevertheless to be expected as the days get shorter and darker. We do however expect solar power to provide support to the power system during day light hours, even in the winter months.”
About the Data
The data is based on 15-minute SCADA readings (MW). The data referenced above is Ireland-only.
Data is provisional and unmetered data, based on real-time information.
1 Average Fuel Mix is a representation of the System Generation fuel mix and net imports across the power system. The “Renewables” category includes wind, solar, hydro and biomass sources. It excludes some non-centrally monitored generation (e.g. small-scale combined heat and power and microgeneration).
2 Not including rooftop (embedded) solar.
3 System demand represents the electricity production required to meet national electricity consumption, including system losses, but net of generators' requirements.