A Record-Breaking Year for Green Energy in Great Britain: 2025
The year 2025 marked a significant milestone in Great Britain's journey towards a sustainable future. BBC analysis reveals that renewable energy sources, a cornerstone in the battle against climate change, produced an unprecedented amount of electricity, setting a new record.
Wind energy took the lead as the primary renewable source, but the real star of the show was solar power. Solar-generated electricity saw a remarkable surge, nearly a third higher than the previous year, thanks to the UK's sunniest year on record and the widespread installation of solar panels across the country.
However, the challenge of transitioning away from fossil fuels remains. Electricity from fossil gas also increased slightly, highlighting the uphill battle to meet the government's ambitious "clean power" target by 2030.
"While we've seen strong progress with renewables, we're still not on track to meet the 2030 clean power goal," said Pranav Menon, a research senior associate at the Aurora Energy Research think tank. "The targets are extremely ambitious, and we need an exponential scale-up in renewable energy deployment to get there."
The government's "clean power" target aims to virtually eliminate the use of polluting gas in electricity production by 2030. It's a tall order, especially with the added pressure to reduce energy bills by up to £300 by the same year. Clean power is seen as a key strategy to achieve this goal.
The data from the National Energy System Operator (Neso) covers Great Britain but not Northern Ireland, which has its own electricity transmission system. Despite this, the growth of renewables in Great Britain has been a bright spot in the global fight against climate change, and the trend is particularly notable over the past decade.
In 2025, wind, solar, hydro, and biomass collectively generated over 127 terawatt-hours (TWh) of electricity in Great Britain, surpassing the previous high of 119TWh in 2024. Wind alone accounted for more than 85TWh, nearly 30% of Great Britain's electricity, a slight increase from the previous year.
But the most remarkable transformation came from solar power. Throughout the year, solar panels generated over 18TWh, contributing more than 6% of British electricity. While this is still a small fraction, it represents a growth of over 4TWh compared to 2024. At its peak in July, solar was producing more than 40% of electricity for certain half-hour periods, a significant leap from 2013 when no such period had more than 5% of electricity generation from solar.
The expansion of solar panels across the UK, including the launch of large solar farms like the one at Cleve Hill near Faversham in Kent, and the record number of rooftop solar installations, played a crucial role in this success. The sunniest year on record in the UK provided ideal conditions for solar panels to shine, quite literally, through the long, sunny days of spring and summer.
"Solar has exceeded expectations, given the significant cost reduction," said Michael Grubb, professor of energy and climate change at University College London. "Renewables can be a reliable source of electricity when conditions are favorable."
Indeed, on roughly a third of days in 2025, at least half of Britain's electricity came from renewables. However, the British electricity grid still heavily relies on fossil fuel gas, which generated more than 77TWh, roughly 27% of electricity, an increase from 72TWh in 2024. This rise could be attributed to various factors, including lower imports from Europe, reduced nuclear generation, the closure of the last coal power station in 2024, and higher electricity demand.
Consequently, Britain's electricity was slightly more polluting in 2025 than in 2024, according to Neso's data. Each kilowatt-hour (kWh) of electricity generated 126g of planet-warming carbon dioxide on average, up from 124g/kWh in 2024 but down from 505g/kWh in 2012.
While the Neso figures provide a comprehensive overview, they do not include smaller-scale gas, biomass, and hydro operators feeding electricity at a local level. However, a separate analysis by the climate website Carbon Brief, which includes these smaller sources and Northern Ireland, shows very similar trends, including a new renewables record and a slight rise in gas generation.
The government's "clean power" target aims for 95% of all electricity generated in Britain to come from renewables and nuclear energy by 2030. In 2024, clean sources produced almost three-quarters of total electricity generation. However, there's still a long way to go, as gas still accounts for a significant portion of the electricity mix.
"There are still many periods in the year when the sun isn't shining, the wind isn't blowing, and demand is high. This is when the system relies heavily on gas-fired power to meet the demand," said Mr. Menon. "But there are solutions, such as battery storage to save renewable energy for less sunny and windy days, and other low-carbon sources like nuclear power, which can provide a dependable output."
One of the challenges in meeting the clean power target is the need to upgrade the electricity grid to accommodate new renewables and transport their electricity across the country. Sometimes, the grid cannot handle all the renewable electricity that could be generated, leading to wind farms being paid to reduce their output.
Grid upgrades are necessary but come at a cost in the short term, which could offset some of the savings from the cheapest renewables displacing gas power, according to Prof. Grubb. However, he expects energy bills to start decreasing in the coming years, due to both the increasing use of renewables and assuming gas prices fall from their recent high levels.
Energy Secretary Ed Miliband welcomed the renewables data, stating, "This government is taking back control of Britain's energy with clean homegrown power, protecting households against volatile fossil fuel markets."
But shadow energy secretary Claire Coutinho urged the government to reconsider its clean power target, arguing that it is driving up energy bills. "Britain is leading the way in renewable power generation, but people should be aware of the additional costs associated with it," she said.
The journey towards a clean energy future is fraught with challenges, but the progress made in 2025 is a testament to the potential of renewable energy. The debate continues: Can Britain meet its ambitious clean power target by 2030? What are your thoughts on the role of renewables and the government's energy policies? Feel free to share your opinions in the comments below!
