Britain’s renewable electricity generation hit a new record for the third quarter of 2025, with wind and solar output combining to deliver the country’s cleanest power mix on record, according to the latest data from Montel Analytics.
In the three months to the end of September, total renewable output — including wind, solar, hydro and biomass — reached 31.9 terawatt hours (TWh), the highest Q3 figure since records began in 2014. Renewables accounted for 51% of Britain’s total power generation, overtaking all fossil-fuelled sources combined.
Wind power led the charge with 17.7TWh, up 6% year on year and the highest third-quarter output ever recorded by Montel. The increase came despite several periods of curtailment, particularly in September when strong winds coincided with weak demand, driving electricity prices into negative territory for several hours.
Solar generation also saw exceptional gains, producing 6.2TWh — the second-highest quarterly total since records began, behind only Q2 2025. This marked a 32% increase on Q3 2024’s total of 4.7TWh, fuelled by prolonged sunshine and intense summer heatwaves in early July and mid-August that sent temperatures soaring and boosted cooling demand across the UK.
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