Best September on record for Irish wind farms

23 October 2025

Wind generation in Ireland was the highest on record for a September month, according to Wind Energy Ireland (WEI), which today published its monthly wind energy report as delegates arrived for the second day of Ireland’s Wind Energy Expo 2025 in the RDS.

Wind energy provided 35 per cent of the country’s electricity last month while solar and other renewables provided an additional 7 per cent for a total renewable share of 42 per cent.

The average wholesale price of electricity in September was €94.48 per MWh, down from €112.73 during the same month last year, and a slight drop from the €96.38 recorded in August 2025.

The latest figures show that wind power generation in September 2025 totalled around 1,129 gigawatt-hours (GWh), with Kerry once again leading the way as Ireland’s top county for wind energy production (129 GWh). It was followed by Cork (117 GWh), Galway (95 GWh), Derry (77 GWh) and Mayo (71 GWh). 

Noel Cunniffe, CEO of Wind Energy Ireland, said: “Wind energy is our number one source of renewable energy. Renewables provided over 40 per cent of our electricity last month and that figure is set to rise as we build more wind and solar farms.

 “The more wind energy that we produce here in Ireland, the more we can secure our own supply of clean, affordable electricity and reduce the need to import expensive fossil fuels.

 “Rather than importing hundreds of millions of euros of gas, Irish wind farms ensure money stays where it belongs, at home, supporting Irish workers and businesses.”

Price of electricity

Prices on days with the most wind power saw the average cost of a megawatt-hour of electricity fall to €62.01 per megawatt hour and rise to €117.37 on days when we relied almost entirely on fossil fuels.

Noel Cunniffe added: “Every time a wind turbine is generating electricity it is pushing down the wholesale electricity prices which leads to lower electricity bills for consumers.

 “Research published in 2025 shows that between 2020 and 2023 renewable energy cut energy bills by an average of €320 per person.

 “That’s an example of how investing in clean energy can deliver real savings for households and as Ireland grows its renewable energy capacity, those savings will continue to grow.”

 Budget 2026

The launch of the monthly wind energy report follows the launch of the Government’s Budget 2026 which was welcomed by the wind energy industry.

It includes significant investment to support the development of Ireland’s offshore wind resources and increase capacity within our key Stage agencies. 

 Noel Cunniffe concluded: “Ensuring we have the right people, expertise and resources in place to deliver more clean, affordable energy for communities across Ireland is essential.

 “The Government’s Budget for 2026 provides the confidence that the necessary funding will be available to help grow our renewable energy sector.

“The investment to support the development of Ireland’s national DMAP, along with additional funding to increase capacity within our State agencies, will help transform our electricity system and accelerate the delivery of clean, affordable and secure energy for Irish families and businesses.”

The results of this report are based on EirGrid’s SCADA data compiled by MullanGrid, market data provided by ElectroRoute and county-level wind generation data provided by Green Collective.