Great Britain Achieves Record Renewable Power Generation in 2025

Great Britain recorded new highs in renewable electricity output in 2025, with both wind and solar power reaching their highest annual generation levels to date. The increase in renewable generation contributed to a larger share of the country’s electricity supply coming from clean sources.

Wind power generation in Great Britain reached 87 TWh in 2025, marking a 5 % rise compared to the previous year. Solar power also saw substantial growth, with annual generation totaling 19 TWh, representing a 31 % increase from 2024. These figures reflect the highest annual outputs for both technologies on record.

Total renewable electricity generation, including wind, solar, biomass, and hydro, amounted to 152 TWh in 2025. This total was 6 % higher than in 2024. During the year, renewables supplied 47 % of the UK’s electricity, while gas accounted for 28 %, nuclear for 11 %, and net imports for 10 %.

Several peak generation events occurred throughout 2025. On 5 December, wind generation reached a half-hour peak of 23.8 GW, meeting 52 % of the country’s electricity demand at that time. Solar generation also achieved a notable peak of 14.0 GW on 8 July, supplying 40 % of demand during that hour.

What the numbers show

• Wind generation in 2025 reached 87 TWh, up 5 % from 2024
• Solar generation in 2025 totaled 19 TWh, a 31 % increase year-on-year
• Renewables supplied 47 % of UK electricity in 2025
• Great Britain ran on 100 % clean power for 87 hours in 2025

In the second quarter of 2025, renewable electricity made up 56 % of the UK’s electricity mix, which was the highest share recorded for any second quarter. Wind and solar outputs in this period were also at their highest for a Q2, with 17.6 TWh from wind and 7.2 TWh from solar.

By mid-December 2025, solar generation had reached 18.314 TWh, which was a 30 % increase over the previous year. As of mid-August, Britain had already produced more solar energy than in the whole of 2024, with 14.08 TWh generated by that point in the year.

Great Britain also set new records for periods of clean electricity. The country operated on 100 % clean power for a total of 87 hours in 2025, up from 64.5 hours in 2024. On 4 July, combined output from wind, solar, biomass, and hydro reached a record 31.3 GW, meeting 84 % of demand during a half-hour period.

New infrastructure contributed to these achievements. Cleve Hill Solar Park, the largest solar farm in the UK, began operations in July 2025, adding 373 MW of capacity along with battery storage. This addition supported the growth in solar output and helped achieve new generation milestones throughout the year.

* This article is based on publicly available information at the time of writing.