The UK’s climate saw a record-breaking 2025, with the year being both the warmest and sunniest seen since observations began.
The year 2025 has joined 2024, 2023, 2022 and 2014 in the UK’s top-five warmest years.
In this review, we take a look back at the UK’s climate in 2025 and place the record-breaking year in the context of human-caused climate change. We find:
- It was the warmest and sunniest year on record. January and September were the only months that were cooler than average.
- A Met Office attribution study estimates that 2025’s average temperature would have been exceptionally unlikely in pre-industrial times – but could now occur, on average, every three years.
- Spring was the warmest on record, breaking a record set in 2024.
- Spring was not only the sunniest on record, but the fourth-sunniest season ever recorded, after the summers of 1976, 1996 and 1911.
- It was the warmest summer on record. The summer temperature record was made around 70 times more likely due to human-induced climate change.
- The persistent high-pressure systems in spring and summer, which contributed to the warm and sunny conditions, also resulted in an extended dry spell – including the driest spring since 1974.
- Wetter conditions at the end of the year alleviated some of the rain shortfall. The year concluded with 90% of average annual rainfall.
- Storm Éowyn in late January was the most powerful wind storm in over a decade and the most severe storm in Northern Ireland since 1998.
- Storm Floris in early August was not unprecedented for a storm, but was one of the most severe wind storms to affect Scotland during the summer.
- Storm Amy in early October hit north-western parts of the UK, with heavy rain falling widely, resulting in the wettest day of the year for the UK overall.
(See our previous annual analysis for 2024, 2023, 2022, 2021, 2020, 2019 and 2018.)
The year in summary
The Met Office relies on the long-running HadUK-Grid dataset to place recent UK weather and climate into its historical context. The gridded, geographically complete dataset combines observational data for monthly temperature since 1884, rainfall since 1836 and sunshine since 1910.
Unless stated otherwise, the rankings of events and statements (such as “warmest on record”) in this article relate to the HadUK-Grid series.
The “climate anomaly” maps below show the difference between the average temperature (left), rainfall total (middle) and sunshine duration (right) between 2025 and the 1991-2020 period. In other words, they show how much warmer, cooler, wetter, drier, sunnier or cloudier the year was than average for each county of the UK.
The maps show that the whole country was warmer than average, with central and north-east England, parts of Northern Ireland and the tip of north-west Scotland, Orkney and Shetland seeing the greatest change.
The UK overall had 90% of average rainfall. The driest regions relative to average were around Essex, Moray and Aberdeenshire, which received less than 75% of normal annual rainfall.
In contrast, some western counties were slightly wetter than average – including Cornwall (110%) and Cumbria (107%).
Sunshine was above average across the UK, with eastern England and north Scotland exceeding 120% of the average.
Attribution
The UK’s absolute temperature averaged at 10.09C in 2025. This follows 2022 (at 10.03C) as the second time that the annual average temperature has exceeded 10C.
In our analysis of the UK’s climate in 2022 for Carbon Brief, we reported on a Met Office attribution study that found that human-caused climate change had increased the likelihood of UK annual absolute temperature averaging above 10C by a factor 160.
That study concluded that exceeding 10C – while unprecedented in the historical observational record – would become increasingly common and would likely occur every three-to-four years.
Three years on from that analysis and the 10C threshold has been breached for a second time – and an updated attribution analysis has been produced exploring the likelihood of a return of temperatures above the 10.09C recorded in 2025.
The study, which uses the same methodology as the 2022 paper, finds that UK annual mean temperatures above 10.09C are estimated to occur approximately every three years in the current climate. In contrast, they would have occurred around every 780 years in pre-industrial times.
Human-caused climate change has, therefore, increased the probability of average temperatures in excess of 10.09C by a factor of 260.
These results show that 2025’s record-breaking annual temperature – while unprecedented in the historical observational record – should be considered fairly normal in the current climate.
Climate projections indicate that, by the later part of the 21st century, a year like 2025 could be a relatively cool year.
The figure below compares observations of UK annual average temperatures (black line) – relative to the long-term average – to climate model simulations that include (red/purple) or exclude (green) human-caused emissions of greenhouse gases and land-use change.
The green and red curves start to diverge from around the 1980s, suggesting that human influence is indeed the dominant factor in the warming trend. The shaded range of the simulations show that in our current and future climate, much warmer years than 2025 are plausible.
Colder years are also still possible, but it is much less likely that we would experience a cold year like 2010 – and exceptionally unlikely for a year to be in the top-10 coldest years for the UK. The most recent year to feature in the top-10 coldest years was 1963.
Warmer, wetter, sunnier
Four of the UK’s last five years all appear in the top-five warmest years since 1884.
The Central England Temperature (CET) series is the longest continuous instrumental climate record in the world, dating back to 1659. Covering a region roughly enclosed by Lancashire, London and Bristol, it does not represent the whole of the UK. However, when averaged across a year and analysed across centuries, it does provide a multi-century perspective that is representative of climate variations and changes that impacted the UK.
As with the HadUK-Grid temperature record, the CET series also identifies 2025 as the warmest year on record. The longer-running temperature series identifies the same five years – in the same order – as the warmest on record. This is shown in the table below.
| Year | UK (from HadUK-Grid) | Central England Temperature |
|---|---|---|
| 2025 | 10.09C | 11.23C |
| 2022 | 10.03C | 11.18C |
| 2023 | 9.97C | 11.13C |
| 2014 | 9.88C | 11.04C |
| 2024 | 9.79C | 10.96C |
The graph below of the CET series shows that temperatures recorded in recent years are well outside the range of variability recorded over more than 300 years.
However, the UK is not only warming, it is also getting wetter and sunnier. The year 2025 was relatively dry, recording 90% of average rainfall. This made it the driest year recorded since 2010 and put it in contrast to relatively wet years in 2023 and 2024.
The longer-term trend can be seen in the figure below, which shows that 2025 was relatively dry compared to recent decades, but not exceptional in the longer-term historical context.
The last time the UK had a year in the top-10 driest was in 1955, whereas all five of the top-10 wettest years have occurred this millennium. The wettest year on record still stands as 1872.
The drivers of annual rainfall trends are more complex than for temperature.
A significant factor in rainfall trends is a warming atmosphere’s ability to hold more moisture. However, this does not completely account for recent increases in rainfall.
Large-scale atmospheric circulation patterns – particularly features such as the jet stream and associated storm tracks across the North Atlantic – also play a crucial role. These are influenced by annual and decadal fluctuations in the Earth’s climate, as well as human-caused climate change.
UK annual sunshine totals have also been rising since the 1980s, with 2025 setting a record by a considerable margin. This is in sharp contrast to 2024, which was the dullest year since 1998. This is shown in the graph below, where the dotted line shows the underlying long-term trend, with year-to-year variations removed.
The cause of the sunshine trend is also uncertain, with both natural climate variability and human activity (through reduced regional air pollution caused by a reduction in aerosol emissions) potential contributors. Climate projections do not provide any strong evidence for how sunshine trends might develop.
The year in storms
The Met Office has been naming storms since 2015. Each storm-naming period runs from September to August.
(For more on storm naming in the UK, read Carbon Brief’s explainer.)
The criteria for storm naming has changed over time. It accounts for meteorological conditions, as well as the potential severity of impacts. As a result, comparisons between years can indicate relative levels of storm activity, but should not be done on a like-for-like basis.
Between the 2015-16 and 2024-25 storm seasons, there have been, on average, 7.7 named storms each year, with a high of 12 recorded in the 2023-24 season and a low of four over 2022-23. This is shown in the line chart below.
By this measure, 2025 was not exceptional with six named storms – two from the 2024-25 season and four from 2025-26. These are listed in the table below.
| Storm name | Date(s) of impact in UK | Maximum wind gust | Notable features |
|---|---|---|---|
| 2024-25 names | |||
| Éowyn | 24 January | 87Kt (100mph), Drumalbin, Lanarkshire | Most powerful storm for over a decade |
| Floris | 4-5 August | 71Kt (82mph) at Wick Airport, Caithness | Equalled Scotland’s August gust speed record |
| 2025-26 names | |||
| Amy | 3-4 October | 83Kt (96mph) at Tiree, Argyll | Significant disruption from flooding. |
| Benjamin (named by Meteo France) | 22-23 October | 52Kt (60mph) Needles, Isle Of Wight | Strongest winds affected northern France |
| Claudia (named by AEMET, Spain) | 14 November | 59Kt (68mph) Warcop Range, Cumbria | Extensive heavy rainfall across England and Wales |
| Bram | 8-10 December | 73Kt (84mph), Capel Curig, Conwy | Flooding from heavy rainfall on saturated ground. |
Credit: Met Office storm centre
Storm Éowyn in January had the most severe winds of any storm in 2025. The Met Office issued a red warning for wind across Northern Ireland and the south-west and central belt of Scotland. An amber warning was issued for the northern half of the UK. At the peak of the storm, power outages were reported at around 1m homes.
Storms from October to December were notable for bringing some persistent and heavy rain during a period of wetter weather, in contrast to the extended dry spell earlier in the year.
Weather through the year
The charts below show the progression of temperature and rainfall through the course of 2025.
The plot below charts average daily temperature over the course of 2025, with orange shading showing warmer-than-average conditions. Overall, the year had 244 days – 66% of the total – where temperatures were above average.
On the other hand, cold spells – indicated by blue shading – were generally short-lived and not very severe, with the exception of events in early January and November.
Fifty-one days in 2025 were in the top 5% warmest for the time of year in the historical record, but only one day – 20 November – was in the 5% of coldest.
The significant number of warmer days and absence of cool ones helps build a picture of how 2025 was the warmest year overall.
The highest daily maximum temperature recorded in the year was 35.8C at Faversham, Kent on 1 July during an early summer heatwave. The lowest minimum temperature was -18.9C, recorded at Altnaharra, Sutherland on 11 January.
A maximum annual temperature of 35.8C is not an exceptional high for recent years – especially when compared with 2022’s record of 40.3C. However it would have been a rare event in the 20th century, when just three years – 1932 (36.1C), 1976 (35.9C) and 1990 (37.1C) – saw a higher temperature.
In the 21st century, six years have seen temperatures above 35.8C – 2003, 2006, 2015, 2019, 2020, and 2022.
The plot below illustrates 2025’s below-average rainfall accumulation.
The brown shading – which represents the deficit in rainfall at that point of the year compared to the 1991-2020 average – highlights how rainfall totals were particularly low during the dry spring and summer period. The lower blue line shows how rainfall accumulation in 2025 came close to – but did not quite reach – a record low in late May and late August.
Wetter conditions in the autumn saw rainfall totals recover a little to reach 90% at the end of the year – which is below average, but not exceptional. As noted previously, there were regional variations.
Winter
In climate terms, the UK winter spans the calendar months of December, January and February.
The winter of 2024-25 was slightly warmer than average, but not exceptional, with an average temperature of 4.62C. This is 0.53C above the 1991-2020 average. The winter months had 89% of average rainfall and 94% of average sunshine.
New Year’s Day saw significant flooding that affected parts of Lancashire and the south side of Manchester. The River Mersey reached record levels in the wake of two days of heavy, persistent rain.
The coldest spell of 2025 occurred in early January, with significant snowfall in some regions.
Storm Éowyn and heavy rain at the end of January were the winter’s most impactful events, bringing high winds and flooding that resulted in considerable disruption.
Spring
Spring – which encompasses the months of March, April and May – was the warmest and sunniest on record, as well as the sixth driest.
The record high temperature came only one year after the previous record set in 2024, continuing a trend of increasing spring time temperature for the UK.
(A Met Office attribution analysis which explored the record-breaking temperatures of May 2024 showed that the temperatures were caused by a combination of a marine heatwave which persisted through May and into June and human-induced climate change.)
The timeseries below shows average spring temperature in the UK over 1884-2025. It shows a significant warming trend since the 1970s, with temperatures in 2024 and 2025 sitting well outside the range of variability observed in the late 19th and 20th centuries.
The UK’s changing climate is having an impact on the natural cycles of many species and habitats. Citizen science initiatives have highlighted how “signs of spring” – for instance, the first flowering or first nest-building – occur increasingly early in the year.
Summer
Warm, sunny and dry conditions persisted into the summer season, drying out soils.
There were four heatwave events, which impacted almost all regions of the UK. Two of these events took place in June.
A marine heatwave also took place, with sea surface temperatures of 1.5-3C above the 1983-2012 average in the Celtic Sea, English Channel and southern North Sea.
An attribution study by the World Weather Attribution service estimated that human-caused climate change had made exceeding June heatwave thresholds around 10 times more likely. The research also found that one of the June heatwaves had been made 2-4C more intense as a result of human influence.
The five warmest summers recorded in the UK to date are 2025 (16.10C), 2018 (15.76C), 2006 (15.75C), 2003 (15.74C) and 2022 (15.71C).
Met Office analysis estimates that in a pre-industrial climate, a summer like 2025 would be expected to occur every 340 years. However, in the current climate, we could expect to see these sorts of summers roughly once every five years.
The study also shows that the UK could plausibly experience much hotter summers in the current and future climate. Events that would have been seen as extremes in the past are becoming more common.
A Met Office attribution study published in 2019 estimated that the then record-breaking summer of 2018 had a statistical return period of approximately eight-to-nine years. The summer of 2025 has broken that record in seven years, consistent with these previous findings.
The science is clear that UK summers are becoming warmer and extreme heat events are becoming more common. This could mean more significant impacts on people, infrastructure and the environment – both now and in the future.
The map below plots the number of heatwaves that took place in June, July and August across the UK. It shows how a significant number of regions across saw more three (green shading) or four (pink shading) over the summer months.
Autumn
Autumn and the month of December were marked with unsettled weather, with mild and wet conditions over the four-month period.
The season was warmer and wetter than average. Northern Ireland had its third-wettest autumn on record, Northern England its fifth wettest and Wales its 10th wettest.
Storm Amy set a record for highest gust speed for a storm in October, with 80Kt (92mph) recorded at Magilligan, County Londonderry.
Other major storms were notable for heavy rainfall that caused flooding. Storm Claudia brought heavy rainfall to central England and Wales in mid-November, which fell on already saturated ground.
The second half of November saw snow cause across the North York Moors during a cold northerly spell which saw some hard frosts. This was followed by generally mild and unsettled conditions until late December, when strong easterly winds brought more low temperatures and hard frosts.
The UK chalked up a number of significant climate records in 2025, particularly for high temperatures. This aligns with the well-established warming trend that is the result of human-caused climate change.
Climate attribution studies continue to provide further evidence that human factors are increasing the likelihood and severity of UK climate extremes.
Many of 2025’s records will not stand for long. There is a high chance they will be broken again in the near future as the climate continues to warm.
The post Met Office: A review of the UK’s climate in 2025 appeared first on Carbon Brief.
Greenhouse Gases
DeBriefed 30 January 2026: Fire and ice; US formally exits Paris; Climate image faux pas
Welcome to Carbon Brief’s DeBriefed.
An essential guide to the week’s key developments relating to climate change.
This week
Fire and ice
OZ HEAT: The ongoing heatwave in Australia reached record-high temperatures of almost 50C earlier this week, while authorities “urged caution as three forest fires burned out of control”, reported the Associated Press. Bloomberg said the Australian Open tennis tournament “rescheduled matches and activated extreme-heat protocols”. The Guardian reported that “the climate crisis has increased the frequency and severity of extreme weather events, including heatwaves and bushfires”.
WINTER STORM: Meanwhile, a severe winter storm swept across the south and east of the US and parts of Canada, causing “mass power outages and the cancellation of thousands of flights”, reported the Financial Times. More than 870,000 people across the country were without power and at least seven people died, according to BBC News.
COLD QUESTIONED: As the storm approached, climate-sceptic US president Donald Trump took to social media to ask facetiously: “Whatever happened to global warming???”, according to the Associated Press. There is currently significant debate among scientists about whether human-caused climate change is driving record cold extremes, as Carbon Brief has previously explained.
Around the world
- US EXIT: The US has formally left the Paris Agreement for the second time, one year after Trump announced the intention to exit, according to the Guardian. The New York Times reported that the US is “the only country in the world to abandon the international commitment to slow global warming”.
- WEAK PROPOSAL: Trump officials have delayed the repeal of the “endangerment finding” – a legal opinion that underpins federal climate rules in the US – due to “concerns the proposal is too weak to withstand a court challenge”, according to the Washington Post.
- DISCRIMINATION: A court in the Hague has ruled that the Dutch government “discriminated against people in one of its most vulnerable territories” by not helping them to adapt to climate change, reported the Guardian. The court ordered the Dutch government to set binding targets within 18 months to cut greenhouse gas emissions in line with the Paris Agreement, according to the Associated Press.
- WIND PACT: 10 European countries have agreed a “landmark pact” to “accelerate the rollout of offshore windfarms in the 2030s and build a power grid in the North Sea”, according to the Guardian.
- TRADE DEAL: India and the EU have agreed on the “mother of all trade deals”, which will save up to €4bn in import duty, reported the Hindustan Times. Reuters quoted EU officials saying that the landmark trade deal “will not trigger any changes” to the bloc’s carbon border adjustment mechanism.
- ‘TWO-TIER SYSTEM’: COP30 president André Corrêa do Lago believes that global cooperation should move to a “two-speed system, where new coalitions lead fast, practical action alongside the slower, consensus-based decision-making of the UN process”, according to a letter published on Tuesday, reported Climate Home News.
$2.3tn
The amount invested in “green tech” globally in 2025, marking a new record high, according to Bloomberg.
Latest climate research
- Including carbon emissions from permafrost thaw and fires reduces the remaining carbon budget for limiting warming to 1.5C by 25% | Communications Earth & Environment
- The global population exposed to extreme heat conditions is projected to nearly double if temperatures reach 2C | Nature Sustainability
- Polar bears in Svalbard – the fastest-warming region on Earth – are in better condition than they were a generation ago, as melting sea ice makes seal pups easier to reach | Scientific Reports
(For more, see Carbon Brief’s in-depth daily summaries of the top climate news stories on Monday, Tuesday, Wednesday, Thursday and Friday.)
Captured
Sales of electric vehicles (EVs) overtook standard petrol cars in the EU for the first time in December 2025, according to new figures released by the European Automobile Manufacturers’ Association (ACEA) and covered by Carbon Brief. Registrations of “pure” battery EVs reached 217,898 – up 51% year-on-year from December 2024. Meanwhile, sales of standard petrol cars in the bloc fell 19% year-on-year, from 267,834 in December 2024 to 216,492 in December 2025, according to the analysis.
Spotlight
Looking at climate visuals
Carbon Brief’s Ayesha Tandon recently chaired a panel discussion at the launch of a new book focused on the impact of images used by the media to depict climate change.
When asked to describe an image that represents climate change, many people think of polar bears on melting ice or devastating droughts.
But do these common images – often repeated in the media – risk making climate change feel like a far-away problem from people in the global north? And could they perpetuate harmful stereotypes?
These are some of the questions addressed in a new book by Prof Saffron O’Neill, who researches the visual communication of climate change at the University of Exeter.
“The Visual Life of Climate Change” examines the impact of common images used to depict climate change – and how the use of different visuals might help to effect change.
At a launch event for her book in London, a panel of experts – moderated by Carbon Brief’s Ayesha Tandon – discussed some of the takeaways from the book and the “dos and don’ts” of climate imagery.
Power of an image
“This book is about what kind of work images are doing in the world, who has the power and whose voices are being marginalised,” O’Neill told the gathering of journalists and scientists assembled at the Frontline Club in central London for the launch event.
O’Neill opened by presenting a series of climate imagery case studies from her book. This included several examples of images that could be viewed as “disempowering”.
For example, to visualise climate change in small island nations, such as Tuvalu or Fiji, O’Neill said that photographers often “fly in” to capture images of “small children being vulnerable”. She lamented that this narrative “misses the stories about countries like Tuvalu that are really international leaders in climate policy”.
Similarly, images of power-plant smoke stacks, often used in online climate media articles, almost always omit the people that live alongside them, “breathing their pollution”, she said.
During the panel discussion that followed, panellist Dr James Painter – a research associate at the Reuters Institute for the Study of Journalism and senior teaching associate at the University of Oxford’s Environmental Change Institute – highlighted his work on heatwave imagery in the media.
Painter said that “the UK was egregious for its ‘fun in the sun’ imagery” during dangerous heatwaves.
He highlighted a series of images in the Daily Mail in July 2019 depicting people enjoying themselves on beaches or in fountains during an intense heatwave – even as the text of the piece spoke to the negative health impacts of the heatwave.
In contrast, he said his analysis of Indian media revealed “not one single image of ‘fun in the sun’”.
Meanwhile, climate journalist Katherine Dunn asked: “Are we still using and abusing the polar bear?”. O’Neill suggested that polar bear images “are distant in time and space to many people”, but can still be “super engaging” to others – for example, younger audiences.
Panellist Dr Rebecca Swift – senior vice president of creative at Getty images – identified AI-generated images as “the biggest threat that we, in this space, are all having to fight against now”. She expressed concern that we may need to “prove” that images are “actually real”.
However, she argued that AI will not “win” because, “in the end, authentic images, real stories and real people are what we react to”.
When asked if we expect too much from images, O’Neill argued “we can never pin down a social change to one image, but what we can say is that images both shape and reflect the societies that we live in”. She added:
“I don’t think we can ask photos to do the work that we need to do as a society, but they certainly both shape and show us where the future may lie.”
Watch, read, listen
UNSTOPPABLE WILDFIRES: “Funding cuts, conspiracy theories and ‘powder keg’ pine plantations” are making Patagonia’s wildfires “almost impossible to stop”, said the Guardian.
AUDIO SURVEY: Sverige Radio has published “the world’s, probably, longest audio survey” – a six-hour podcast featuring more than 200 people sharing their questions around climate change.
UNDERSTAND CBAM: European thinktank Bruegel released a podcast “all about” the EU’s carbon adjustment border mechanism, which came into force on 1 January.
Coming up
- 1 February: Costa Rican general election
- 3 February: UN Environment Programme Adaptation Fund Climate Innovation Accelerator report launch, Online
- 2-8 February: Intergovernmental Platform on Biodiversity and Ecosystem Services (IPBES) 12th plenary, Manchester, UK
Pick of the jobs
- Climate Central, climate data scientist | Salary: $85,000-$92,000. Location: Remote (US)
- UN office to the African Union, environmental affairs officer | Salary: Unknown. Location: Addis Ababa, Ethiopia
- Google Deepmind, research scientist in biosphere models | Salary: Unknown. Location: Zurich, Switzerland
DeBriefed is edited by Daisy Dunne. Please send any tips or feedback to debriefed@carbonbrief.org.
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The post DeBriefed 30 January 2026: Fire and ice; US formally exits Paris; Climate image faux pas appeared first on Carbon Brief.
DeBriefed 30 January 2026: Fire and ice; US formally exits Paris; Climate image faux pas
Electric heat pumps are set to play a key role in the UK’s climate strategy, as well as cutting the nation’s reliance on imported fossil fuels.
Heat pumps took centre-stage in the UK government’s recent “warm homes plan”, which said that they could also help cut household energy bills by “hundreds of pounds” a year.
Similarly, innovation agency Nesta estimates that typical households could cut their annual energy bills nearly £300 a year, by switching from a gas boiler to a heat pump.
Yet there has been widespread media coverage in the Times, Sunday Times, Daily Express, Daily Telegraph and elsewhere of a report claiming that heat pumps are “more expensive” to run.
The report is from the Green Britain Foundation set up by Dale Vince, owner of energy firm Ecotricity, who campaigns against heat pumps and invests in “green gas” as an alternative.
One expert tells Carbon Brief that Vince’s report is based on “flimsy data”, while another says that it “combines a series of worst-case assumptions to present an unduly pessimistic picture”.
This factcheck explains how heat pumps can cut bills, what the latest data shows about potential savings and how this information was left out of the report from Vince’s foundation.
How heat pumps can cut bills
Heat pumps use electricity to move heat – most commonly from outside air – to the inside of a building, in a process that is similar to the way that a fridge keeps its contents cold.
This means that they are highly efficient, adding three or four units of heat to the house for each unit of electricity used. In contrast, a gas boiler will always supply less than one unit of heat from each unit of gas that it burns, because some of the energy is lost during combustion.
This means that heat pumps can keep buildings warm while using three, four or even five times less energy than a gas boiler. This cuts fossil-fuel imports, reducing demand for gas by at least two-fifths, even in the unlikely scenario that all of the electricity they need is gas-fired.
Since UK electricity supplies are now the cleanest they have ever been, heat pumps also cut the carbon emissions associated with staying warm by around 85%, relative to a gas boiler.
Heat pumps are, therefore, the “central” technology for cutting carbon emissions from buildings.
While heat pumps cost more to install than gas boilers, the UK government’s recent “warm homes plan” says that they can help cut energy bills by “hundreds of pounds” per year.
Similarly, Nesta published analysis showing that a typical home could cut its annual energy bill by £280, if it replaces a gas boiler with a heat pump, as shown in the figure below.
Nesta and the government plan say that significantly larger savings are possible if heat pumps are combined with other clean-energy technologies, such as solar and batteries.
Both the government and Nesta’s estimates of bill savings from switching to a heat pump rely on relatively conservative assumptions.
Specifically, the government assumes that a heat pump will deliver 2.8 units of heat for each unit of electricity, on average. This is known as the “seasonal coefficient of performance” (SCoP).
This figure is taken from the government-backed “electrification of heat” trial, which ran during 2020-2022 and showed that heat pumps are suitable for all building types in the UK.
(The Green Britain Foundation report and Vince’s quotes in related coverage repeat a number of heat pump myths, such as the idea that they do not perform well in older properties and require high levels of insulation.)
Nesta assumes a slightly higher SCoP of 3.0, says Madeleine Gabriel, the organisation’s director of sustainable future. (See below for more on what the latest data says about SCoP in recent installations.)
Both the government and Nesta assume that a home with a heat pump would disconnect from the gas grid, meaning that it would no longer need to pay the daily “standing charge” for gas. This currently amounts to a saving of around £130 per year.
Finally, they both consider the impact of a home with a heat pump using a “smart tariff”, where the price of electricity varies according to the time of day.
Such tariffs are now widely available from a variety of energy suppliers and many have been designed specifically for homes that have a heat pump.
Such tariffs significantly reduce the average price for a unit of electricity. Government survey data suggests that around half of heat-pump owners already use such tariffs.
This is important because on the standard rates under the price cap set by energy regulator Ofgem, each unit of electricity costs more than four times as much as a unit of gas.
The ratio between electricity and gas prices is a key determinant of the size and potential for running-cost savings with a heat pump. Countries with a lower electricity-to-gas price ratio consistently see much higher rates of heat-pump adoption.
(Decisions taken by the UK government in its 2025 budget mean that the electricity-to-gas ratio will fall from April, but current forecasts suggest it will remain above four-to-one.)
In contrast, Vince’s report assumes that gas boilers are 90% efficient, whereas data from real homes suggests 85% is more typical. It also assumes that homes with heat pumps remain on the gas grid, paying the standing charge, as well as using only a standard electricity tariff.
Prof Jan Rosenow, energy programme leader at the University of Oxford’s Environmental Change Institute, tells Carbon Brief that Vince’s report uses “worst-case assumptions”. He says:
“This report cherry-picks assumptions to reach a predetermined conclusion. Most notably, it assumes a gas boiler efficiency of 90%, which is significantly higher than real-world performance…Taken together, the analysis combines a series of worst-case assumptions to present an unduly pessimistic picture.”
Similarly, Gabriel tells Carbon Brief that Vince’s report is based on “flimsy data”. She explains:
“Dale Vince has drawn some very strong conclusions about heat pumps from quite flimsy data. Like Dale, we’d also like to see electricity prices come down relative to gas, but we estimate that, from April, even a moderately efficient heat pump on a standard tariff will be cheaper to run than a gas boiler. Paired with a time-of-use tariff, a heat pump could save £280 versus a boiler and adding solar panels and a battery could triple those savings.”
What the latest data shows about bill savings
The efficiency of heat-pump installations is another key factor in the potential bill savings they can deliver and, here, both the government and Vince’s report take a conservative approach.
They rely on the “electrification of heat” trial data to use an efficiency (SCoP) of 2.8 for heat pumps. However, Rosenow says that recent evidence shows that “substantially higher efficiencies are routinely available”, as shown in the figure below.
Detailed, real-time data on hundreds of heat pump systems around the UK is available via the website Heat Pump Monitor, where the average efficiency – a SCoP of 3.9 – is much higher.
Homes with such efficient heat-pump installations would see even larger bill savings than suggested by the government and Nesta estimates.
Academic research suggests that there are simple and easy-to-implement reasons why these systems achieve much higher efficiency levels than in the electrification of heat trial.
Specifically, it shows that many of the systems in the trial have poor software settings, which means they do not operate as efficiently as their heat pump hardware is capable of doing.
The research suggests that heat pump installations in the UK have been getting more and more efficient over time, as engineers become increasingly familiar with the technology.
It indicates that recently installed heat pumps are 64% more efficient than those in early trials.
Notably, the Green Britain Foundation report only refers to the trial data from the electrification of heat study carried out in 2020-22 and the even earlier “renewable heat premium package” (RHPP). This makes a huge difference to the estimated running costs of a heat pump.
Carbon Brief analysis suggests that a typical household could cut its annual energy bills by nearly £200 with a heat pump – even on a standard electricity tariff – if the system has a SCoP of 3.9.
The savings would be even larger on a smart heat-pump tariff.
In contrast, based on the oldest efficiency figures mentioned in the Green Britain Foundation report, a heat pump could increase annual household bills by as much as £200 on a standard tariff.
To support its conclusions, the report also includes the results of a survey of 1,001 heat pump owners, which, among other things, is at odds with government survey data. The report says “66% of respondents report that their homes are more expensive to heat than the previous system”.
There are several reasons to treat these findings with caution. The survey was carried out in July 2025 and some 45% of the heat pumps involved were installed between 2021-23.
This is a period during which energy prices surged as a result of Russia’s invasion of Ukraine and the resulting global energy crisis. Energy bills remain elevated as a result of high gas prices.
The wording of the survey question asks if homes are “more or less expensive to heat than with your previous system” – but makes no mention of these price rises.
The question does not ask homeowners if their bills are higher today, with a heat pump, than they would have been with the household’s previous heating system.
If respondents interpreted the question as asking whether their bills have gone up or down since their heat pump was installed, then their answers will be confounded by the rise in prices overall.
There are a number of other seemingly contradictory aspects of the survey that raise questions about its findings and the strong conclusions in the media coverage of the report.
For example, while only 15% of respondents say it is cheaper to heat their home with a heat pump, 49% say that one of the top three advantages of the system is saving money on energy bills.
In addition, 57% of respondents say they still have a boiler, even though 67% say they received government subsidies for their heat-pump installation. It is a requirement of the government’s boiler upgrade scheme (BUS) grants that homeowners completely remove their boiler.
The government’s own survey of BUS recipients finds that only 13% of respondents say their bills have gone up, whereas 37% say their bills have gone down, another 13% say they have stayed the same and 8% thought that it was too early to say.
The post Factcheck: What it really costs to heat a home in the UK with a heat pump appeared first on Carbon Brief.
Factcheck: What it really costs to heat a home in the UK with a heat pump
The European Union and the UK are not on track to meet their 2030 offshore wind targets.
At the same time, Chinese wind-turbine manufacturers – who account for more than half of global wind-turbine capacity – are looking to grow their footprint in the European market, where their presence is currently tiny.
To some, the solution seems clear: allowing Chinese manufacturers to invest in Europe could boost competition, alleviate supply chain bottlenecks and lower costs – not to mention bring climate targets within reach.
But the possibility of a growing role for Chinese wind-turbine manufacturers in the European market has sparked heated debate among European policymakers and industry participants.
In 2024, three of China’s top wind-turbine companies accounted for less than 1% of Europe’s installed wind capacity.
But their focus is increasingly shifting to the continent, which some are concerned could hollow out the one clean-energy industry in which Europe is still competitive.
Competition between European and Chinese manufacturers would be “unfair”, according to critics, because the discounts Chinese firms are offering seem to be at least in part due to state subsidies.
In a recent report published by the Oxford Institute for Energy Studies, we explore whether Chinese wind turbine companies are competitive in Europe and the real risks and benefits of Chinese participation in European offshore wind markets.
Our findings build on interviews with policymakers and industry experts, who have been granted anonymity to allow for candid discussion.
Cost advantages are less clear-cut than they appear
China ranks first for many of the global statistics for offshore wind. It has been by far the largest offshore wind market in the world for several years running.
China had 47 gigawatts (GW) of offshore wind installed, as of September 2025, more than all other countries combined. Furthermore, China also dominates several key fields critical to offshore wind globally, ranging from permanent magnets to offshore installation vessels.
This stands in firm contrast to Europe – where offshore development has experienced several years of slow growth – and the US, which faces an almost complete halt in new development under the Trump administration.
As happened before in solar and batteries, China’s offshore wind industry scale-up has brought about stunning declines in installation costs.
However, this cost advantage is not as straightforward as these headline numbers would suggest. Despite the vast difference in capacity cost, the electricity produced by Chinese offshore wind farms is only 30% cheaper.
A key reason for this is the lower overall capacity factor of China’s offshore wind sector, referring to the actual output of windfarms in China, compared to their maximum possible output. This can be partly explained by lower wind speeds at China’s offshore sites, but could also relate to lower performance of Chinese turbines, as well as power transmission issues.
Lower production costs in China also would not necessarily translate to the European market, as Chinese cost advantages would be partly offset by transport costs, as well as higher insurance and financing premiums.
Greater localisation of turbine production could mitigate against some of these premiums, but would be offset by higher input costs in Europe.
Nonetheless, as more European governments add local content requirements, Chinese manufacturers have announced plans to set up European factories for turbine blades and towers, with core components shipped from China.
These factories could also be costlier to finance than those back home if financing for investments also comes from Europe, further reducing the cost advantage enjoyed by China’s domestic offshore-energy infrastructure.
Issues beyond costs and bottlenecks
European offshore wind development plans have faced a number of hurdles, including rising costs, slow permitting processes, inefficient auction designs, lengthy grid connection times and limited availability of parts, port capacity and installation vessels.
The small number of players in Europe’s offshore wind sector is seen as part of the problem, according to our interviews.
Currently, there are only three major wind turbine manufacturers in the European offshore wind market: Vestas, Siemens Gamesa and GE Vernova.
The latter announced in 2024 that it is downsizing its offshore wind business and has not taken new offshore orders, although it remains active in onshore wind projects. This reduces competition and could hinder efforts to bring down the cost of offshore wind projects.
Bottlenecks, inadequate industry capacity and lack of competition cannot in themselves explain the current European predicament. Developers we interviewed also note that offshore wind auctions with price caps and stringent contractual terms, designed with an expectation of falling costs, have also been part of the problem.
When these auctions have failed – as in the UK in 2023 and Germany in 2025 – this led to capacity contraction, higher costs and industry consolidation, which have only made it more difficult to reach policy targets, according to a report by European offshore wind company Ørsted.
Even with improved European auction design, it may take years for Europe’s offshore wind installation numbers to recover. With or without Chinese participation, it will also take time to build domestic manufacturing bases and installation vessels.
Pathways to Chinese involvement
Meanwhile, Chinese developers benefit from a large and growing domestic market in China. At the same time, however, intense competition on price and quality is spurring them to seek opportunities overseas.
Throughout Europe’s supply chain, Chinese components and services are already helping alleviate shortages and bottlenecks.
Still, our report found there are divergent views on whether a greater Chinese presence in Europe’s wind markets represents a threat or an opportunity – or both.
Policymakers are expected to continue to emphasise concerns about technology dependence and cybersecurity risks, leading to more domestic content requirements and increased scrutiny of Chinese deals.
The case of the 300 megawatt (MW) Luxcara project in Germany highlights the difficulties for Chinese market entry. Chinese manufacturer Mingyang was initially selected by the project owner in 2024, but was later replaced by Siemens-Gamesa, reportedly due to concerns about security and political risks.
The recent announcement of a deal between the UK’s Octopus Energy and Mingyang may illustrate an emerging model. According to Octopus, Mingyang will supply the physical equipment, while Octopus will supply the software and manage the turbines.
Mingyang will still need access to operational data to support ongoing maintenance, but this can be provided periodically by Octopus without compromising security, the energy company told us.
Meanwhile, following policy signals such as the EU’s new pricing mechanism for electric vehicle imports from China, it seems likely that policymakers will continue to encourage Chinese players to establish production bases in Europe and to require technology licensing or technology transfer in exchange for market access. This would amount to applying the Chinese industrial development model in Europe.
This could allow for technological learning in Europe. In China, the largest players have deployed advanced automated manufacturing lines, including robotic blade bonding, modular stator assembly and real-time quality monitoring – although this may have implications for job creation, a stated aim in Europe’s clean-energy policy.
Despite pointing to some advantages, our interviews suggest that Chinese participation in Europe’s offshore wind market is not a panacea.
Its low costs are unlikely to be transferrable to the European context. But greater Chinese participation in auctions and in manufacturing, with local content requirements and other guardrails, could help spur competition in Europe.
At the same time, our report suggests that the focus on China distracts from deeper issues. Without a growing domestic market, it may be difficult for European players to reduce manufacturing costs and upgrade production, with or without Chinese partners.
Ultimately, industry participants tell us that the greatest determinant of success in Europe’s offshore wind market will be consistent policy support, rather than a decision to allow – or to block – Chinese participation.
The post Experts: Will Chinese wind power help or hinder Europe’s climate goals? appeared first on Carbon Brief.
Experts: Will Chinese wind power help or hinder Europe’s climate goals?
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