Ireland's Hottest Summer on Record Boosts Solar Generation 58%

Ireland's Hottest Summer on Record Drives 58% Solar Generation Surge

Ireland just experienced its hottest summer since records began in 1900, and solar panels across the country responded exactly as you would expect. Solar electricity generation jumped 58% compared to summer 2025, reaching 692 GWh and contributing up to 9.4% of Ireland's electricity mix in a single month.

If you have ever heard someone say "Ireland is too cloudy for solar," this summer just proved them spectacularly wrong.

Ireland's Record-Breaking Summer 2026

According to Met Éireann's climate statement, summer 2026 (June, July and August) posted an average temperature of 16.28°C, making it 0.09°C warmer than 2025 and 2.03°C above the long-term average. The peak came on 25 June when Athenry in County Galway hit 32.2°C, the highest single reading of the season.

July 2026 was particularly extreme. It became the second hottest July since 1900 and the driest July on record for Ireland. Cork Airport, Johnstown Castle, Moore Park and Oak Park all recorded their warmest and driest month ever. Johnstown Castle in Wexford broke the national record for the sunniest month on record with 332.4 hours of sunshine.

Six of the ten hottest summers in Ireland have occurred since 2001. Records are being broken with increasing frequency, and Met Éireann's climatologist Paul Moore confirmed what many already suspected: "Records are being toppled nearly every month because our climate is warming at a rapid pace now."

Solar Responded with Record Generation

While the heat made headlines, Ireland's solar panels were quietly delivering the kind of performance that changes the conversation about renewable energy.

According to EirGrid's latest figures, solar generation across June, July and August 2026 totalled 692 GWh, up 58% from 439 GWh during the same three months in 2025.

*Figures from EirGrid, September 2026.

July's 9.4% solar share was a national record. Nearly one in every ten units of electricity consumed in Ireland that month came from solar panels.

Grid-scale solar farms also set new peak generation records. On 11 August at 12.41pm, solar hit 1.25 GW. Just 13 days later on 24 August at 11.43am, it reached 1.3 GW, enough to power nearly half a million homes at that moment.

Diarmaid Gillespie, EirGrid's Director of System Operations, called it "a significant time for the contribution of solar powered energy in Ireland."

"Notably in April we reached the milestone of over 1 GW of electricity provided by grid-scale solar power for the first time," he said. "This record has since been surpassed a number of times over the last months."

What This Means for Irish Homeowners

If you are considering solar panels for your home, this summer offers three important lessons.

1. Solar Works Brilliantly in Irish Sunshine

The "too cloudy" objection has always been overblown, but summer 2026 put hard numbers on the table. When conditions are right, solar delivers. And with climate change driving hotter, sunnier summers, those conditions are becoming more frequent.

A typical 5 kWp home solar system in Ireland generates around 4,700 kWh per year. During a summer like 2026, with record sunshine and heat, systems can outperform expectations by 10% to 20% or more, especially in the South and East where Cork Airport and Johnstown Castle both broke sunshine records.

2. Climate Change Is Making Solar More Valuable

Ireland's climate is warming faster than many realise. Six of the ten hottest summers have happened since 2001. July 2026 alone saw heatwaves lasting up to 13 days at Moore Park in Cork, the second longest heatwave on record for Ireland.

Warmer, sunnier summers mean more solar generation. And with electricity prices still high (the average Irish household pays around €1,870 annually at the time of writing), every extra kilowatt-hour your panels generate is money saved.

3. Solar Reduces Your Climate Impact While Prices Rise

Ireland's electricity system still relies heavily on gas. In August 2026, gas accounted for 42% of all electricity used, and 26% was imported via interconnection.

Every home solar system reduces demand for gas-fired electricity. Over a year, a typical 5 kWp system offsets around 2 tonnes of CO₂. Multiply that by the 200,000+ Irish homes now running solar, and the impact becomes significant.

What Happens in Winter?

EirGrid acknowledged that solar generation will drop as the days get shorter. "As we head into the autumn and the days get shorter, solar generation will contribute less to the fuel mix," Gillespie said. "However it is still expected to provide support to the power system during day light hours, even in the depths of winter."

Winter solar output in Ireland is typically 30% to 40% of summer output. A system generating 650 kWh in July might produce 200 kWh in December. But even in winter, Irish solar panels continue to generate electricity during daylight hours, especially on clear, cold days when panel efficiency actually improves.

Final Thoughts

Summer 2026 was a historic moment for Ireland's climate and its energy system. Record-breaking heat drove record-breaking solar generation, proving once and for all that solar panels work in Ireland, and they work well.

As summers get hotter and electricity prices remain high, solar is no longer a niche technology. It is a practical, proven way to cut your energy bills, reduce your carbon footprint and hedge against future price increases.

Ready to Join Ireland's Solar Revolution?

Over 200,000 Irish homes are already generating their own electricity with solar panels. With the SEAI grant at €1,800 (at the time of writing August 2026), there has never been a better time to make the switch.

Get your free solar quote from WattCharger and see how much you could save this year.