Irish wind farms supplied 33 per cent of the island's electricity in 2025, generating approximately 13,634 GWh of clean power, according to Wind Energy Ireland's annual report published last week.

The Republic of Ireland now has more than 5,000 MW of installed onshore wind capacity following the addition of 150 MW in 2025. Kerry led the country as the top-producing county for wind power, followed by Cork and Galway.

December saw wind farms provide 39 per cent of national electricity, with solar power and other renewables contributing an additional 4 per cent for a total renewable share of 43 per cent. Wind generation hit 1,523 GWh last month, marking the second highest December on record.

The report noted that on days with the most wind power, the average cost of a megawatt-hour of electricity fell to €76.41 but rose to €148.55 on days when the country relied almost entirely on fossil fuels.

Noel Cunniffe, chief executive of Wind Energy Ireland, said that Ireland now has over 5,000 MW of onshore wind energy with a further 450 MW in construction and 2,500 MW of projects with planning permission.

However, he noted that 13 per cent of the country's cheapest electricity was wasted last year because the existing grid was not strong enough to carry all the power that Irish wind farms produced for homes and businesses.

"Making the electricity grid strong enough to accommodate increasing volumes of affordable energy is essential. Building out energy storage infrastructure will also be important so that we can save excess renewable energy for when we need it," he added.

Explore the full article on Wind Energy Ireland's 2025 annual report.