September was a strong month for wind generation nationwide, meeting 35% of Ireland’s total electricity demand.
Overall, wind farms across the country produced around 1,129 gigawatt-hours (GWh) during the month.
When combined with solar and other renewable sources, renewables accounted for a 42% share of Ireland’s electricity supply.
Record-breaking month
According to industry data, September marked the best September on record for wind energy output in Ireland.
As new wind farms continue to come online and grid connections expand, record-breaking months are expected to become more common.
However, a key challenge remains: rising electricity demand is offsetting some of the gains from increased renewable generation, keeping the overall renewable share relatively static in recent years.
Electricity prices
The average wholesale price of electricity in September stood at €94.48 per megawatt-hour (MWh), down from €112.73/MWh during the same month last year and slightly lower than €96.38/MWh recorded in August 2025.
On days with the highest wind output, prices fell as low as €62.01/MWh, while on days when the grid relied heavily on fossil fuels, prices rose to €117.37/MWh.
Impact on consumers
Noel Cunniffe, CEO at Wind Energy Ireland, commented: “Every time a wind turbine is generating electricity, it pushes down wholesale electricity prices – which ultimately leads to lower energy bills for consumers.”
Research published in 2025 found that between 2020 and 2023, renewable energy reduced average household energy bills by €320 per person.
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