The installation of solar panels and heat pumps in UK homes soared in 2023, driving the country to its highest-ever level of domestic low-carbon technology upgrades.
Registered solar photovoltaic (PV) installations rose nearly 30% to a post-subsidy record of 189,826 in 2023, according to the Microgeneration Certification Scheme (MCS).
Similarly, heat-pump installations were up 20%, reaching a record 36,799.
This growth drove a UK record for the total number of domestic renewable electricity and low-carbon heat technologies installations registered by MCS, which reached 229,618.
This brings the total MCS-certified installations of solar PV overall to 1,441,753 since 2009, equivalent to more than 5% of all UK households.
The near-record figure for home solar in 2023 is particularly significant because it came without any government support, whereas previous growth was driven by deadlines under the Feed-in-Tariff (FiT) subsidy scheme, which ended in 2019.
Below, Carbon Brief looks at MCS’s installation figures for 2023, picking out some of the most significant domestic developments.
Record clean energy growth
The UK had already recorded its “best-ever” year for renewable energy and low-carbon heat installations before 2023 came to end, as Solar Power Portal reported in December.
While solar PV and air-source heat pumps (ASHP) saw growth in their installation rates in 2023, other clean technologies dropped off somewhat.
By the end of the year, a record total of 229,618 MCS certified installations had been registered (there is the potential for a small change to the total, due to a lag with registrations, MCS told Carbon Brief).
This included a post-subsidy record 189,826 solar PV installations, up by a third from the 138,020 seen in 2022.
Solar Energy UK chief executive Chris Hewett said in a statement:
“Setting a post-subsidy record of almost 190,000 smaller-scale solar PV installations, and approaching the all-time record of 203,000, is truly a moment to celebrate. The solar industry is on a roll, particularly as we start to conclude work on the government-industry Solar Taskforce, whose roadmap for delivering 70GW [gigawatts] of capacity is due to be published in a couple of months.”
The number of MCS-registered ASHP installations grew to a record 36,799 in 2023 from 29,490 a year earlier. (The real number of heat pumps installed in the UK is likely to be higher, as there is currently no mandate for all low-carbon technology deployments to be certified, or reported in a single place.)
Bean Beanland, director for growth at trade association the Heat Pump Federation, tells Carbon Brief the growth in demand for ASHPs was being driven by increasing activity from “early movers”, as well as by the boiler upgrade scheme (BUS) subsidy, which was introduced in 2022 and increased in 2023.
The BUS initially offered a £5,000 grant for those installing an ASHP or biomass boiler and £6,000 for a ground-source heat pump (GSHP). This was raised to £7,500 for both ASHPs and GSHPs in October 2023.
Beanland adds:
“[Following the increase in the grant] one of our members went back to all the consumers who they had quoted during 2023, detailing the increase, but where they had not converted the opportunity. The result was a significant number of contracts, so the additional £2,500 has certainly made a difference.
“In parallel, the whole visibility of the technology is being driven by the likes of Octopus, Good Energy and OVO, with their very high-profile campaigns and the advent of time-of-use tariffs that improve the financial benefits considerably.”
Customers who are able to afford to deploy solar PV, a battery and a heat pump can use such tariffs to reduce operational cost, allowing the heat pump to compete with gas, he adds.
The number of GSHP installations fell from 3,420 to 2,469, while solar-thermal installations nearly halved, falling from 615 to 311.
Beanland says:
“The value of the BUS for ground-source is just far too low. Government has made a conscious decision to go for numbers rather than the highest efficiency by supporting air-source to a much greater extent. This has been compounded now that the BUS levels for air- and ground- are the same.”
The surge in ASHP means that low-carbon heating technologies still saw an overall increase in 2023, rising by 20% year-on-year, as reported by BusinessGreen.
Despite this growth, however, the installation of heat pumps remains a long way from hitting the UK government target of 600,000 installations per year by 2028.

While the MCS dashboard does not provide data on battery storage installations, a recent release from the company states that 2023 was a record-breaking year for the technology. MCS says batteries were the third most popular technology type to be installed in homes by its certified contractor base.
Of the 4,700 certified batteries registered with MCS, 4,400 were installed in 2023, it adds.
With the energy price cap on average domestic energy bills now sitting below £2,000 per year and installation costs having increased with inflation, it is unclear whether the high levels of solar PV installations in 2023 will be maintained this year.
Solar Energy UK’s chief communications officer Gareth Simkins says:
“Speculation is always a dangerous game. I think it is reasonable for current deployment rates – around 15,000 a month – to continue. This will not just be retrofits of course – we expect more newbuild homes to carry solar, too.”
Monthly solar installations hit highs
Last year saw monthly installations of rooftop solar PV start to hit the levels seen in 2015, when government subsidies were still available, as shown by the red bars in the figure below.
March 2023 saw 20,073 registered solar PV installations, putting it in the top 10 months seen in the UK. Both 11th and 12th places were claimed by months in 2023 too, with June seeing 18,049 installations and May seeing 17,787 installations.
The rest of the top 10 installation months are dominated by 2011, 2012 and 2015. This was driven largely by subsidy deadlines, with a rush seen ahead of cuts leading to record-high installation periods.

In 2012, the FiT subsidy for solar was cut in half, reducing from 43.3p per kilowatt hour (kWh) to just 21p per kWh. This cut returns from solar electricity from around 7% to 4%, according to the Guardian.
In doing so it almost doubled the payback period for households, with some seeing their £10,000-12,000 solar panels only being in credit after 18 years rather than 10, the Guardian reported at the time.
This change followed then-climate change minister Greg Barker launching a consultation into the subsidies in an effort to avoid the industry falling victim to “boom and bust“.
Following the change, installations fell by nearly 90%, according to Department of Energy and Climate Change figures reported in the Guardian.
Installations dropped from 26,941 in March 2012 to 5,522 in April 2012, according to MCS figures, although there was a further surge later that year.
Throughout 2013, installations remained relatively subdued, growing through 2014 before peaking again in 2015. Installations hit 25,614 in December 2015, but this came ahead of further FiT reduction in February 2016, which sent “shockwaves” through the sector and saw installations drop dramatically
The FiT came to an end in 2019, with the solar export guarantee brought in 2020, which sets a minimum price for electricity exported to the grid.
Following the resulting lull in installations, domestic solar PV has once again been growing. The difference this time is that there is no underlying subsidy driving growth, with rising energy bills and longer-term falls in technology costs making the technology increasingly appealing.
Speaking to Carbon Brief, Solar Energy UK’s Simkins says:
“Oddly enough, it shows the success of FiTs in creating a market for solar in the first place, with the industry now standing entirely on its own two feet without government support.”
Installation costs rise
The inflationary impacts of the Covid-19 pandemic and the subsequent energy crisis led to an increase in solar technology costs in 2023.
Consequently, installation costs have risen over recent years, according to MCS. Across every month in 2023, average installation costs sat above £10,000 – the only time in more than a decade that they have reached that level, as shown in the figure below.
This has been impacted by the scale of the installations to a certain extent, with the installation cost per kilowatt (kW) seeing a more limited increase. Across 2022, the average cost of installing solar per kW was £1,804 and in 2023 this rose to £2,020.
Moreover, in some months, solar was actually cheaper per kilowatt (kW) in 2023 than in 2022, MCS data shows.
It is also worth noting that the increase in the cost of solar installations has not been as dramatic as the increase in energy bills over the past couple of years.
The energy crisis drove up domestic energy bills from late 2021, as supply chain squeezes driven in part by the Russian invasion of Ukraine sent gas prices to record highs.
As a result, the default tariff price cap for consumers jumped from £1,277 per year in the six months to March 2022, to £1,971 over that summer, and then to £3,549 over the winter of 2022.
It then surged again to £4,279 over the first quarter of 2023, before it began to fall (the energy price guarantee came into force in October 2022, superseding the rate of the price cap, and limiting domestic energy bills to £2,500 initially).
The surge in domestic energy prices highlighted the exposure of the British energy system to fluctuations in international gas markets. In doing so, it is likely it helped drive uptake of domestic solar – as shown in the figure below – as households looked to cushion themselves from potential future surges.

Speaking to Carbon Brief, solar wholesaler Midsummer’s commercial director Jamie Vaux says installation costs are now coming down.
The high installation costs and long installation lead times in 2022, were driven by demand exceeding supply, he says. With new installers entering the market and mortgage rates and inflation hitting consumer spending, this has started to ease, he adds.
Average installation prices per kW peaked at £2,111 in April 2023, before slowly falling throughout the year.
Vaux explains:
“Essentially, those who had the funds available when the energy crisis hit have already had their installations, and while many still want solar, the rate stopped climbing so steeply and the curve flattened at the same time as more installers were there to meet the demand. It has become more competitive at the installation level, and installation costs have (gradually) fallen as a result.”
There is also currently a glut of solar modules, which could help prices continue to fall and stimulate further update of solar, according to Vaux.
There is currently “a year’s worth of modules already sitting in EU warehouses, and devaluing daily”, Vaux adds, meaning top-tier modules can be bought for a fraction of prices seen in 2022.
Solar Scotland
The area with the overall highest share of households with solar PV installations since the start of MCS data in 2009 is Stirling in Scotland, where 16.7% of households have solar PV (6,994 households).
Perhaps surprisingly, given their poorer insolation rates relative to other parts of the UK, Scottish local authorities appear four times in the top 10, as shown in the figure below.
Scotland’s housing policy means it is mandatory for solar to be fitted on all new build properties, helping to boost installation rates.

In terms of installations completed during 2023, the Isle of Anglesey came out on top, with 1,083 systems added, amounting to 3.5% of households.
The top 10 for last year is dominated by Welsh and Scottish local authorities, with just one English local authority making it into the list – South Cambridgeshire in ninth place.
There are five Scottish local authorities (Dumfries and Galloway, East Lothian, Perth, Moray and Kinross and Midlothian) and four Welsh local authorities (Isle of Anglesey, Ceredigion, Powys and Pembrokeshire).
The 10 local authority areas with the lowest percentage of solar PV installations since 2009 are all in London, with Kensington and Chelsea coming out on top with just 0.4% (or 297) of households having registered solar PV installed, according to MCS.
It is worth noting that due to the density of the households in London and other major cities, they are over-represented in the lowest percentage list for solar installations.
For example, Wandsworth – which comes out as having the tenth lowest rate of just 1.1% of households having solar PV – only has 1,496 installations.
Meanwhile, Torridge in Devon – which has the eighth highest rate of installations in the UK at 12.8% – has 3,899 solar PV installations. While this is more than double the number is Wandsworth, the much larger difference in percentage terms highlights the impact of population size in each local authority area.
The same is broadly true of 2023. While the area last year with the lowest installation rate was Derry City and Strabane, with just 73 installations (0.1% of households), the bottom ten is still dominated by London boroughs, which made up eight of the list.
Detached properties are the most common when it comes to solar PV installations, with 50,8193 of the MCS registered solar PV installations since 2009 (35.2%) having been fitted on detached properties, versus 447,415 on semi-detached, 288,886 on terraced, 187,131 on flats and apartments and 10,100 on other properties.
This means detached properties – which tend to be larger, with more roof area – are over-represented in terms of their share of solar installations, as shown in the figure below.

The post Analysis: Surge in heat pumps and solar drives record for UK homes in 2023 appeared first on Carbon Brief.
Analysis: Surge in heat pumps and solar drives record for UK homes in 2023
Climate Change
The 2026 budget test: Will Australia break free from fossil fuels?
In 2026, the dangers of fossil fuel dependence have been laid bare like never before. The illegal invasion of Iran has brought pain and destruction to millions across the Middle East and triggered a global energy crisis impacting us all. Communities in the Pacific have been hit especially hard by rising fuel prices, and Australians have seen their cost-of-living woes deepen.
Such moments of crisis and upheaval can lead to positive transformation. But only when leaders act with courage and foresight.
There is no clearer statement of a government’s plans and priorities for the nation than its budget — how it plans to raise money, and what services, communities, and industries it will invest in.
As we count down the days to the 2026-27 Federal Budget, will the Albanese Government deliver a budget for our times? One that starts breaking the shackles of fossil fuels, accelerates the shift to clean energy, protects nature, and sees us work together with other countries towards a safer future for all? Or one that doubles down on coal and gas, locks in more climate chaos, and keeps us beholden to the whims of tyrants and billionaires.
Here’s what we think the moment demands, and what we’ll be looking out for when Treasurer Jim Chalmers steps up to the dispatch box on 12 May.
1. Stop fuelling the fire
2. Make big polluters pay
3. Support everyone to be part of the solution
4. Build the industries of the future
5. Build community resilience
6. Be a better neighbour
7. Protect nature
1. Stop fuelling the fire

In mid-April, Pacific governments and civil society met to redouble their efforts towards a Fossil Fuel Free Pacific. Moving beyond coal, oil and gas is fundamental to limiting warming to 1.5°C — a survival line for vulnerable communities and ecosystems. And as our Head of Pacific, Shiva Gounden, explained, it is “also a path of liberation that frees us from expensive, extractive and polluting fossil fuel imports and uplifts our communities”.
Pacific countries are at the forefront of growing global momentum towards a just transition away from fossil fuels, and it is way past time for Australia to get with the program. It is no longer a question of whether fossil fuel extraction will end, but whether that end will be appropriately managed and see communities supported through the transition, or whether it will be chaotic and disruptive.
So will this budget support the transition away from fossil fuels, or will it continue to prop up coal and gas?
When it comes to sensible moves the government can make right now, one stands out as a genuine low hanging fruit. Mining companies get a full rebate of the excise (or tax) that the rest of us pay on diesel fuel. This lowers their operating costs and acts as a large, ongoing subsidy on fossil fuel production — to the tune of $11 billion a year!
Greenpeace has long called for coal and gas companies to be removed from this outdated scheme, and for the billions in savings to be used to support the clean energy transition and to assist communities with adapting to the impacts of climate change. Will we see the government finally make this long overdue change, or will it once again cave to the fossil fuel lobby?
2. Make big polluters pay

While our communities continue to suffer the escalating costs of climate-fuelled disasters, our Government continues to support a massive expansion of Australia’s export gas industry. Gas is a dangerous fossil fuel, with every tonne of Australian gas adding to the global heating that endangers us all.
Moreover, companies like Santos and Woodside pay very little tax for the privilege of digging up and selling Australians’ natural endowment of fossil gas. Remarkably, the Government currently raises more tax from beer than from the Petroleum Resource Rent Tax (PRRT) — the main tax on gas profits.
Momentum has been building to replace or supplement the PRRT with a 25% tax on gas exports. This could raise up to $17 billion a year — funds that, like savings from removing the diesel tax rebate for coal and gas companies, could be spent on supporting the clean energy transition and assisting communities with adapting to worsening fires, floods, heatwaves and other impacts of climate change.
As politicians arrive in Canberra for budget week, they will be confronted by billboards calling for a fair tax on gas exports. The push now has the support of dozens of organisations and a growing number of politicians. Let’s hope the Treasurer seizes this rare window for reform.
3. Support everyone to be part of the solution
As the price of petrol and diesel rises, electric vehicles (EVs) are helping people cut fuel use and save money. However, while EV sales have jumped since the invasion of Iran sent fuel prices rising, they still only make up a fraction of total new car sales. This budget should help more Australians switch to electric vehicles and, even more importantly, enable more Australians to get around by bike, on foot, and on public transport. This means maintaining the EV discount, investing in public and active transport, and removing tax breaks for fuel-hungry utes and vans.
Millions of Australians already enjoy the cost-saving benefits of rooftop solar, batteries, and getting off gas. This budget should enable more households, and in particular those on lower incomes, to access these benefits. This means maintaining the Cheaper Home Batteries Program, and building on the Household Energy Upgrades Fund.
4. Build the industries of the future

If we’re to transition away from fossil fuels, we need to be building the clean industries of the future.
No state is more pivotal to Australia’s energy and industrial transformation than Western Australia. The state has unrivaled potential for renewable energy development and for replacing fossil fuel exports with clean exports like green iron. Such industries offer Western Australia the promise of a vibrant economic future, and for Australia to play an outsized positive role in the world’s efforts to reduce emissions.
However, realising this potential will require focussed support from the Federal Government. Among other measures, Greenpeace has recommended establishing the Australasian Green Iron Corporation as a joint venture between the Australian and Western Australian governments, a key trading partner, a major iron ore miner and steel makers. This would unite these central players around the complex task of building a large-scale green iron industry, and unleash Western Australia’s potential as a green industrial powerhouse.
5. Build community resilience
Believe it or not, our Government continues to spend far more on subsidising fossil fuel production — and on clearing up after climate-fuelled disasters — than it does on helping communities and industries reduce disaster costs through practical, proven methods for building their resilience.
Last year, the Government estimated that the cost of recovery from disasters like the devastating 2022 east coast floods on 2019-20 fires will rise to $13.5 billion. For contrast, the Government’s Disaster Ready Fund – the main national source of funding for disaster resilience – invests just $200 million a year in grants to support disaster preparedness and resilience building. This is despite the Government’s own National Emergency Management Agency (NEMA) estimating that for every dollar spent on disaster risk reduction, there is a $9.60 return on investment.
By redirecting funds currently spent on subsidising fossil fuel production, the Government can both stop incentivising climate destruction in the first place, and ensure that Australian communities and industries are better protected from worsening climate extremes.
No communities have more to lose from climate damage, or carry more knowledge of practical solutions, than Aboriginal and Torres Strait Islander peoples. The budget should include a dedicated First Nations climate adaptation fund, ensuring First Nations communities can develop solutions on their own terms, and access the support they need with adapting to extreme heat, coastal erosion and other escalating challenges.
6. Be a better neighbour
The global response to climate change depends on the adequate flow of support from developed economies like Australia to lower income nations with shifting to clean energy, adapting to the impacts of climate change, and addressing loss and damage.
Such support is vital to building trust and cooperation, reducing global emissions, and supporting regional and global security by enabling countries to transition away from fossil fuels and build greater resilience.
Despite its central leadership role in this year’s global climate negotiations, our Government is yet to announce its contribution to international climate finance for 2025-2030. Greenpeace recommends a commitment of $11 billion for this five year period, which is aligned with the global goal under the Paris Agreement to triple international climate finance from current levels.
This new commitment should include additional funding to address loss and damage from climate change and a substantial contribution to the Pacific Resilience Facility, ensuring support is accessible to countries and communities that need it most. It should also see Australia get firmly behind the vision of a Fossil Fuel Free Pacific.
7. Protect nature

There is no safe planet without protection of the ecosystems and biodiversity that sustain us and regulate our climate.
Last year the Parliament passed important and long overdue reforms to our national environment laws to ensure better protection for our forests and other critical ecosystems. However, the Government will need to provide sufficient funding to ensure the effective implementation of these reforms.
Greenpeace has recommended $500 million over four years to establish the National Environment Agency — the body responsible for enforcing and monitoring the new laws — and a further $50 million to Environment Information Australia for providing critical information and tools.
Further resourcing will also be required to fulfil the crucial goal of fully protecting 30% of Australian land and seas by 2030. This should include $1 billion towards ending deforestation by enabling farmers and loggers to retool away from destructive practices, $2 billion a year for restoring degraded lands, $5 billion for purchasing and creating new protected areas, and $200 million for expanding domestic and international marine protected areas.
Conclusion
This is not the first time that conflict overseas has triggered an energy crisis, or that a budget has been preceded by a summer of extreme weather disasters, highlighting the urgent need to phase out fossil fuels. What’s different in 2026 is the availability of solutions. Renewable energy is now cheaper and more accessible than ever before. Global momentum is firmly behind the transition away from fossil fuels. The Albanese Government, with its overwhelming majority, has the chance to set our nation up for the future, or keep us stranded in the past. Let’s hope it makes some smart choices.
The 2026 budget test: Will Australia break free from fossil fuels?
Climate Change
What fossil fuels really cost us in a world at war
Anne Jellema is Executive Director of 350.org.
The war on Iran and Lebanon is a deeply unjust and devastating conflict, killing civilians at home, destroying lives, and at the same time sending shockwaves through the global economy. We, at 350.org, have calculated, drawing on price forecasts from the International Monetary Fund (IMF) and Goldman Sachs, just how much that volatility is costing us.
Even under the IMF’s baseline scenario – a de facto “best case” scenario with a near-term end to the war and related supply chain disruptions – oil and gas price spikes are projected to cost households and businesses globally more than $600 billion by the end of the year. Under the IMF’s “adverse scenario”, with prolonged conflict and sustained price pressures, we estimate those additional costs could exceed $1 trillion, even after accounting for reduced demand.
Which is why we urgently need a power shift. Governments are under growing pressure to respond to rising fuel and food costs and deepening energy poverty. And it’s becoming clearer to both voters and elected officials that fossil dependence is not only expensive and risky, but unnecessary.
People who can are voting with their wallets: sales of solar panels and electric vehicles are increasing sharply in many countries. But the working people who have nothing to spare, ironically, are the ones stuck with using oil and gas that is either exorbitantly expensive or simply impossible to get.
Drain on households and economies
In India, street food vendors can’t get cooking gas and in the Philippines, fishermen can’t afford to take their boats to sea. A quarter of British people say that rising energy tariffs will leave them completely unable to pay their bills. This is the moment for a global push to bring abundant and affordable clean energy to all.
In April, we released Out of Pocket, our new research report on how fossil fuels are draining households and economies. We were surprised by the scale of what we found. For decades, governments have reassured people that energy price spikes are unfortunate but unavoidable – the result of distant conflicts, market forces or geopolitical shocks beyond anyone’s control. But the numbers tell a different story.
What we are living through today is not an energy crisis. It is a fossil fuel crisis. In just the first 50 days of the Middle East conflict, soaring oil and gas prices have siphoned an estimated $158 billion–$166 billion from households and businesses worldwide. That is money extracted directly from people’s pockets and transferred, almost instantly, into fossil fuel company balance sheets. And this figure only captures the immediate impact of price spikes, not the permanent economic drain of fossil dependence. Fossil fuels don’t just cost us once, they cost us over and over again.
First, through our bills. Every time there is a war, an embargo or a supply disruption, fossil fuel prices surge. For ordinary people, this means higher costs for energy, transport and food. Many Global South countries have little or no fiscal space to buffer the shock; instead, workers and families pay the price.
Second, through our taxes. Governments around the world continue to pour vast sums of public money into fossil fuel subsidies. These are often justified as a way to protect the most vulnerable at the petrol pump or in their homes. But in reality, the benefits are overwhelmingly captured by wealthier households and corporations. The poorest 20% receive just a fraction of this support, while public finances are drained.
Third, through climate impacts. New research across more than 24,000 global locations gives a granular account of the true costs of extreme heat, sea level rise and falling agricultural yields. Using this data to update IMF modelling of the social cost of carbon, we found that fossil fuel impacts on health and livelihoods amount to over $9 trillion a year. This is the biggest subsidy of all, because these massive and mounting costs are not charged to Big Oil – they are paid for by governments and households, with the poorest shouldering the lion’s share.
Massive transfer of wealth to fossil fuel industry
Adding up direct subsidies, tax breaks and the unpaid bill for climate damages, the total transfer of wealth from the public to the fossil fuel industry amounts to $12 trillion even in a “normal” year without a global oil shock. That’s more than 50% higher than the IMF has previously estimated, and equivalent to a staggering $23 million a minute.
The fossil fuel industry has become extraordinarily adept at profiting from instability. When conflict drives up prices, companies do not lose, they gain. In the current crisis, oil producers and commodity traders are on track to secure tens of billions of dollars in additional windfall profits, even as households face rising bills and governments struggle to manage the fallout.
Fossil fuel crisis offers chance to speed up energy transition, ministers say
This growing disconnect is impossible to ignore. Investors are advised to buy into fossil fuel firms precisely because of their ability to generate profits in times of crisis. Meanwhile, ordinary people are told to tighten their belts.
In 2026, unlike during the oil shocks of the 1970s, clean energy is no longer a distant alternative. Now, even more than when gas prices spiked due to Russia’s invasion of Ukraine in 2022, renewables are often the cheapest option available. Solar and wind can be deployed quickly, at scale, and without the volatility that defines fossil fuel markets.
How to transition from dirty to clean energy
The solutions are clear. Governments must implement permanent windfall taxes on fossil fuel companies to ensure that extraordinary profits generated during crises are redirected to support households. These revenues can be used to reduce energy bills, invest in public services, and accelerate the rollout of clean energy.
Second, we must shift subsidies away from fossil fuels and towards renewable solutions, particularly those that can be deployed quickly and equitably, such as rooftop and community solar. This is not just about cutting emissions. It is about building a more stable, fair and resilient energy system.
Finally, we need binding plans to phase out fossil fuels altogether, replacing them with homegrown renewable energy that can shield economies from future shocks. Because what the current crisis has made clear is this: as long as we remain dependent on fossil fuels, we remain vulnerable – to conflict, to price volatility and to the escalating impacts of climate change.
The true price of fossil fuels is no longer hidden. It is visible in rising bills, strained public finances and communities pushed to the brink. And it is being paid, every day, by ordinary people around the world.
It’s time for the great power shift.
Full details on the methodology used for this report are available here.
The Great Power Shift is a new campaign by 350.org global campaign to pressure governments to bring down energy bills for good by ending fossil fuel dependence and investing in clean, affordable energy for all


The post What fossil fuels really cost us in a world at war appeared first on Climate Home News.
Climate Change
Traditional models still ‘outperform AI’ for extreme weather forecasts
Computer models that use artificial intelligence (AI) cannot forecast record-breaking weather as well as traditional climate models, according to a new study.
It is well established that AI climate models have surpassed traditional, physics-based climate models for some aspects of weather forecasting.
However, new research published in Science Advances finds that AI models still “underperform” in forecasting record-breaking extreme weather events.
The authors tested how well both AI and traditional weather models could simulate thousands of record-breaking hot, cold and windy events that were recorded in 2018 and 2020.
They find that AI models underestimate both the frequency and intensity of record-breaking events.
A study author tells Carbon Brief that the analysis is a “warning shot” against replacing traditional models with AI models for weather forecasting “too quickly”.
AI weather forecasts
Extreme weather events, such as floods, heatwaves and storms, drive hundreds of billions of dollars in damages every year through the destruction of cropland, impacts on infrastructure and the loss of human life.
Many governments have developed early warning systems to prepare the general public and mobilise disaster response teams for imminent extreme weather events. These systems have been shown to minimise damages and save lives.
For decades, scientists have used numerical weather prediction models to simulate the weather days, or weeks, in advance.
These models rely on a series of complex equations that reproduce processes in the atmosphere and ocean. The equations are rooted in fundamental laws of physics, based on decades of research by climate scientists. As a result, these models are referred to as “physics-based” models.
However, AI-based climate models are gaining popularity as an alternative for weather forecasting.
Instead of using physics, these models use a statistical approach. Scientists present AI models with a large batch of historical weather data, known as training data, which teaches the model to recognise patterns and make predictions.
To produce a new forecast, the AI model draws on this bank of knowledge and follows the patterns that it knows.
There are many advantages to AI weather forecasts. For example, they use less computing power than physics-based models, because they do not have to run thousands of mathematical equations.
Furthermore, many AI models have been found to perform better than traditional physics-based models at weather forecasts.
However, these models also have drawbacks.
Study author Prof Sebastian Engelke, a professor at the research institute for statistics and information science at the University of Geneva, tells Carbon Brief that AI models “depend strongly on the training data” and are “relatively constrained to the range of this dataset”.
In other words, AI models struggle to simulate brand new weather patterns, instead tending forecast events of a similar strength to those seen before. As a result, it is unclear whether AI models can simulate unprecedented, record-breaking extreme events that, by definition, have never been seen before.
Record-breaking extremes
Extreme weather events are becoming more intense and frequent as the climate warms. Record-shattering extremes – those that break existing records by large margins – are also becoming more regular.
For example, during a 2021 heatwave in north-western US and Canada, local temperature records were broken by up to 5C. According to one study, the heatwave would have been “impossible” without human-caused climate change.
The new study explores how accurately AI and physics-based models can forecast such record-breaking extremes.
First, the authors identified every heat, cold and wind event in 2018 and 2020 that broke a record previously set between 1979 and 2017. (They chose these years due to data availability.) The authors use ERA5 reanalysis data to identify these records.
This produced a large sample size of record-breaking events. For the year 2020, the authors identified around 160,000 heat, 33,000 cold and 53,000 wind records, spread across different seasons and world regions.
For their traditional, physics-based model, the authors selected the High RESolution forecast model from the Integrated Forecasting System of the European Centre for Medium-Range Weather Forecasts. This is “widely considered as the leading physics-based numerical weather prediction model”, according to the paper.
They also selected three “leading” AI weather models – the GraphCast model from Google Deepmind, Pangu-Weather developed by Huawei Cloud and the Fuxi model, developed by a team from Shanghai.
The authors then assessed how accurately each model could forecast the extremes observed in the year 2020.
Dr Zhongwei Zhang is the lead author on the study and a researcher at Karlsruhe Institute of Technology. He tells Carbon Brief that many AI weather forecast models were built for “general weather conditions”, as they use all historical weather data to train the models. Meanwhile, forecasting extremes is considered a “secondary task” by the models.
The authors explored a range of different “lead times” – in other words, how far into the future the model is forecasting. For example, a lead time of two days could mean the model uses the weather conditions at midnight on 1 January to simulate weather conditions at midnight on 3 January.
The plot below shows how accurately the models forecasted all extreme events (left) and heat extremes (right) under different lead times. This is measured using “root mean square error” – a metric of how accurate a model is, where a lower value indicates lower error and higher accuracy.
The chart on the left shows how two of the AI models (blue and green) performed better than the physics-based model (black) when forecasting all weather across the year 2020.
However, the chart on the right illustrates how the physics-based model (black) performed better than all three AI models (blue, red and green) when it came to forecasting heat extremes.

The authors note that the performance gap between AI and physics-based models is widest for lower lead times, indicating that AI models have greater difficulty making predictions in the near future.
They find similar results for cold and wind records.
In addition, the authors find that AI models generally “underpredict” temperature during heat records and “overpredict” during cold records.
The study finds that the larger the margin that the record is broken by, the less well the AI model predicts the intensity of the event.
‘Warning shot’
Study author Prof Erich Fischer is a climate scientist at ETH Zurich and a Carbon Brief contributing editor. He tells Carbon Brief that the result is “not unexpected”.
He adds that the analysis is a “warning shot” against replacing traditional models with AI models for weather forecasting “too quickly”.
The analysis, he continues, is a “warning shot” against replacing traditional models with AI models for weather forecasting “too quickly”.
AI models are likely to continue to improve, but scientists should “not yet” fully replace traditional forecasting models with AI ones, according to Fischer.
He explains that accurate forecasts are “most needed” in the runup to potential record-breaking extremes, because they are the trigger for early warning systems that help minimise damages caused by extreme weather.
Leonardo Olivetti is a PhD student at Uppsala University, who has published work on AI weather forecasting and was not involved in the study.
He tells Carbon Brief that “many other studies” have identified issues with using AI models for “extremes”, but this paper is novel for its specific focus on extremes.
Olivetti notes that AI models are already used alongside physics-based models at “some of the major weather forecasting centres around the world”. However, the study results suggest “caution against relying too heavily on these [AI] models”, he says.
Prof Martin Schultz, a professor in computational earth system science at the University of Cologne who was not involved in the study, tells Carbon Brief that the results of the analysis are “very interesting, but not too surprising”.
He adds that the study “justifies the continued use of classical numerical weather models in operational forecasts, in spite of their tremendous computational costs”.
Advances in forecasting
The field of AI weather forecasting is evolving rapidly.
Olivetti notes that the three AI models tested in the study are an “older generation” of AI models. In the last two years, newer “probabilistic” forecast models have emerged that “claim to better capture extremes”, he explains.
The three AI models used in the analysis are “deterministic”, meaning that they only simulate one possible future outcome.
In contrast, study author Engelke tells Carbon Brief that probabilistic models “create several possible future states of the weather” and are therefore more likely to capture record-breaking extremes.
Engelke says it is “important” to evaluate the newer generation of models for their ability to forecast weather extremes.
He adds that this paper has set out a “protocol” for testing the ability of AI models to predict unprecedented extreme events, which he hopes other researchers will go on to use.
The study says that another “promising direction” for future research is to develop models that combine aspects of traditional, physics-based weather forecasts with AI models.
Engelke says this approach would be “best of both worlds”, as it would combine the ability of physics-based models to simulate record-breaking weather with the computational efficiency of AI models.
Dr Kyle Hilburn, a research scientist at Colorado State University, notes that the study does not address extreme rainfall, which he says “presents challenges for both modelling and observing”. This, he says, is an “important” area for future research.
The post Traditional models still ‘outperform AI’ for extreme weather forecasts appeared first on Carbon Brief.
Traditional models still ‘outperform AI’ for extreme weather forecasts
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