30% of electricity demand was met by Irish wind farms in June, making it the best June on record, the latest figures from Wind Energy Ireland show.
Wholesale electricity prices also fell for the fifth month in a row to €95.21 - the lowest since April 2024.
This marked the first time that average wholesale prices dropped under €100 so far this year.
On days last month with the most wind power, the average cost of a megawatt-hour of electricity was €67.15 but this rose to €115.06 on days when the country relied almost entirely on fossil fuels.
The monthly report also shows that the demand for electricity in June increased marginally from 3,019 gigawatt-hours (GWh) to 3,151 GWh in the same month last year.
Kerry wind farms provided more electricity than any other county last month with 105 GWh of power, around 11% of the country's wind energy. Kerry was followed by Cork (83 GWh), then Mayo (65 GWh), Galway (64 GWh) and Offaly (61 GWh).
Noel Cunniffe, CEO of Wind Energy Ireland, said its members provided nearly a third of Ireland's electricity during the first half of 2025 and last month was a particularly strong June for renewable energy generation.
"Our wind farms are Ireland's leading source of renewable electricity, playing a key role in reducing our dependency on imported fossil fuels and boosting Ireland's energy security," he said.
"If we can accelerate the delivery of new wind and solar farms, we can continue to reduce our reliance on imported fossil fuels and put money back in people's pockets," he added.
