The UK’s solar farms and rooftops generated more electricity than ever before in the first five months of 2025, as the country enjoyed its sunniest spring on record.
The figures, revealed in new Carbon Brief analysis, show that the nation’s solar sites have generated a record 7.6 terawatt hours (TWh) of electricity during January to May 2025.
This is some 42% higher than the 5.4TWh generated in the same period last year, as well as marking a much larger 260% increase in the past decade.
Solar hit a new half-hourly record of 13.2 gigawatts (GW) on 6 April and, for the first time, accounted for more than 10% of monthly electricity generation in two consecutive months (April and May).
The solar electricity generated in 2025 to date has avoided the need to import gas costing around £600m, which would have released 6m tonnes of carbon dioxide (MtCO2) when burned.
However, solar was still only the UK’s sixth-largest source of electricity in 2025 to date, after gas (37TWh), wind (33TWh), imports (18TWh), nuclear (15TWh) and biomass (8.0TWh).
Although this year’s solar high was partly driven by the record sunniest spring, it was also aided by rising capacity, which reached 20.2GW in 2024, up by 2.3GW from 17.9GW a year earlier.
Solar capacity is set to reach at least 45GW by 2030 as part of the government’s ambition to decarbonise the power sector and become a “clean-energy superpower”.
(This article refers to the UK throughout, but the electricity generation data only covers the island of Great Britain. Northern Ireland is part of the all-Ireland electricity system.)
Solar record
The leap in solar output in 2025 saw generation reaching a record 7.6TWh in the first five months of the year, up 42% year-on-year.
Electricity output from UK solar installations saw particularly big jumps in March – where the 2,320 megawatts (MW) average was up 66% from a year earlier – and in April (3,189MW, up 53%).
There was a more modest 37% year-on-year increase in May 2025 – the country’s second-sunniest May on record – with average output reaching a new monthly high of 3,383MW.
The amount of electricity generated from solar also hit a new high of 2.5TWh in May 2025, beating April 2025’s 2.3TWh into second place. The previous record of 2.1TWh was set in June 2024.
The figure below shows the average monthly output of the UK’s solar capacity, in MW. Output dips in the short, dark days of winter and generally peaks with the longer daylight hours in June.
(The differences between installed electricity generating capacity, actual power output at any given moment and the amount of electricity generated per hour/day/month/year can cause confusion. The UK’s installed solar capacity reached 20GW at the end of last year. This is the maximum amount of power that could theoretically be produced at one time. In practice, the maximum power output recorded to date is 13GW and the average across a full month reached just over 3GW in May, generating 2.5TWh of electricity.)

The electricity generated by the UK’s solar panels in the first five months of 2025 – at 7.5TWh – is enough to have offset the need for around 16TWh of imported gas.
Buying this gas would have cost around £600m – based on recent average wholesale prices – and burning it would have resulted in roughly 6MtCO2, adding nearly 2% to total UK emissions.
The 16TWh of avoided gas imports is equivalent to 10% of the UK’s net gas imports in the same period last year – or around 10 individual Q-Max liquified natural gas (LNG) tankers, the largest currently available.
(For comparison, the UK only took 24 LNG deliveries during April to September 2024, according to data provider Argus. Figures for the first five months of last year are not available.)
The total amount of electricity generated by solar determines how many deliveries of imported gas can be avoided each month, as well as how far the power sector can cut its emissions.
In total, solar accounted for 11.6% of UK electricity generation in May 2025, only the fourth time it has ever breached the 10% threshold, after June 2023, June 2024 and April 2025.
(Solar topped 10% of monthly global electricity generation for the first time in April this year.)
However, the impact on the electricity market depends more closely on the hour-to-hour and day-to-day variations in solar generation due to the weather, seasons and diurnal cycles.
The highest UK solar output on record was reached at 13:00 on 6 April, when the technology was delivering 13.2GW of power and meeting 40% of demand for that half-hour period.
Sunniest spring
The UK saw 653 hours of sunshine in the period from 1 March to 31 May 2025, making it the sunniest spring since records began in 1910, according to the Met Office.
This total is 43% higher than the average for 1961-90. Before this year, the previous record for the sunniest spring had been set in 2020, when there were 626 sunshine hours.
UK sunshine hours have been on an increasing trend, particularly since the 1980s, according to Met Office analysis for Carbon Brief and illustrated in the chart below, which does not cover 2025.
The analysis found that, on average, spring months had been around 15% sunnier over the past decade than during the reference period from 1961-90.
(The analysis put this trend down to a combination of natural variability, changing circulation patterns and possible human influence from shifts in aerosol pollution.)

In a statement announcing the sunniest spring, Met Office scientist Emily Carlisle said: “Seven of the top ten sunniest springs on record for the UK since 1910 have occurred since the year 2000.”
A further Met Office release notes that spring 2025 is not only the sunniest spring on record, but also the fourth-sunniest season overall, with only three summers having had more sunshine.
The extra sunshine this spring contributed to unusually high solar power output per unit of installed capacity, a metric known as the “capacity factor” of the UK’s solar plants.
The capacity factor is a percentage, showing the actual electricity generation relative to the maximum theoretical output, if the panels were working at full capacity all of the time.
Clean power
While sunny weather helped drive the new highs for solar this spring, the UK’s growing capacity also contributed to the records.
After stagnating at around 12-14GW for several years after the then-Conservative government’s decision to end subsidies for solar in 2015, the UK’s installed capacity has since leapt to 20.2GW as of the end of 2024.
Capacity has grown as prices have fallen – boosting the economic case for solar – and as projects with newer “contracts for difference” have started to get built.
Early 2025 has seen the strongest start to the year since 2012 in terms of new rooftop solar capacity. Moreover, the UK is expected to add 3-3.5GW of new solar capacity across 2025 as a whole, according to Solar Media Market Research, up from the 2.3GW added in 2024.
Since taking office last July, energy secretary Ed Miliband has approved around 3GW of new solar capacity at giant sites, including the 500MW Heckington Fen and 500MW Gate Burton schemes.
The government is targeting 45-47GW of solar by 2030 as part of its “mission” to become a “clean-energy superpower”, which aims to have low-carbon sources meeting 100% of UK electricity demand and at least 95% of generation in the country.
Before then, the National Energy System Operator (NESO) is aiming to run the electricity system without fossil fuels for a short period, at some point this year.
Since setting itself this target in 2019, NESO has been making preparations by contracting for zero-carbon sources of grid stability services. These include “inertia” and voltage control, which have traditionally only been offered by conventional fossil-fuel generators.
Only familiar to grid engineers, previously, these terms have recently seen widespread usage in media coverage and finger-pointing over April’s blackouts in Spain and Portugal.
The increase in electricity generation from variable sources, such as wind and solar, brings new technical and market-related challenges, including increasing periods of “negative pricing”.
However, the solutions to these challenges are well-known and already being implemented in the UK. These include the buildout of battery storage systems, increasing interconnector capacity linking the national grid to other countries and new sources of grid stability, such as flywheels.
The post Analysis: UK’s solar power surges 42% after sunniest spring on record appeared first on Carbon Brief.
Analysis: UK’s solar power surges 42% after sunniest spring on record
Climate Change
Marine Parks Explained
Australia’s network of marine parks is the largest in the world, covering more than half (52%) of Australia’s Commonwealth waters. You could be forgiven for assuming that a marine park is much like a national park on land: a highly protected place where people can enjoy nature while conservation efforts help habitats recover and wildlife thrive. You wouldn’t expect someone to bulldoze a national park, so why should they be allowed to bottom trawl in a marine park?
The reality is that not all marine parks are equally protected. Australia’s Marine Parks Network is divided into different zoning categories, with each zone determining which activities are permitted and the level of protection provided.
More than half of the Commonwealth Marine Parks Network allows industrial activities like oil and gas mining, and industrial fishing.
Our survival, and the survival of our planet, depends on the ocean. The ocean produces more oxygen than all of our forests combined, sustains communities and regulates the earth’s temperature. It’s home to wondrous wildlife and important ecosystems like coral reefs and kelp forests.
We love our big blue backyard
Australia’s ocean is teeming with life that is found nowhere else on earth. Schools of colourful fish, vibrant coral reefs, endemic shark nurseries, pods of dolphins, families of whales, playful seal pups and threatened Jurassic-era turtles call Australian waters home.
Since time began, from the turquoise waves to the deep blue, the ocean has connected our shorelines and communities, fed us, guided us and grounded us. We are intrinsically connected to our big blue backyard – more than 85% of us live within 50km of the shoreline. For tens of thousands of years, people have lived in harmony with the ocean and the wildlife within it, caring for and being sustained by its rich waters. Australia’s waters are some of the most unique and abundant places on Earth but our Marine Parks Network is falling short to properly protect them.
Australia’s marine parks aren’t living up to their name

The Australian Commonwealth Marine Parks Network covers commonwealth waters 5.5km from the coast. The network is divided into 7 regional management areas, overall the network contains 60 marine parks. Zoning types determine what activities are allowed in each area. Over half of the network allows industrial activities, risking our most precious and threatened ocean wildlife.
Within many of our marine parks, destructive industries are allowed to fish, trawl, dig and mine using barbaric and cruel methods. Here are some of the zones explained:
- Bottom Trawling: Special Purpose (trawl) zones allow bottom trawling. This covers 10 marine parks totalling almost 13 million hectares. Bottom trawlers bulldoze the seafloor with weighted nets, deforesting our underwater forests; a cruel, indiscriminate and inefficient way to fish.
- Other Industrial Fishing: Includes “Habitat Protection Zones, ““Multi Use Zones” and “Special Purpose Zones.” Fishing methods vary from park to park but many marine parks in these zones allow industrial fishing like longlining. Longlining involves setting lines that can be 100km long, bristling with deadly hooks designed to catch a specific fish species. But longlining is not a selective method of fishing – significant numbers of sharks, rays, turtles, dolphins and seabirds can be harmed or killed as bycatch in the process.
- Oil and Gas Mining: Many “Special Purpose” and “Multi Use” zones allow seismic blasting and oil and gas mining. 30 marine parks or 65 million hectares of Australia’s highest conservation value areas for ocean wildlife are open for mining and exploration of oil and gas.
- Ocean Sanctuaries: National Park and Sanctuary zones are fully and highly protected marine parks designed to conserve wildlife and their habitat, where fishing, mining, and other industrial activities are not allowed.
Industrial fishing is one of the biggest threats to the ocean

In May, Greenpeace Australia Pacific sailed our campaigning vessel Oceania through some of Australia’s most beautiful and threatened marine parks. Our crew visited Jervis and Hunter marine parks to document their beauty, showcase what’s at risk and aim to expose the industrial fishing activities in these protected waters. Both of these marine parks allow bottom trawling and longlining methods of industrial fishing.
Industrial fishing is ripping the ocean apart across the planet. Longlining, also known as longline fishing, is an industrial fishing method that involves the use of a fishing line with thousands of baited hooks. These fishing lines can stretch over 100 kilometers in length and are set to capture a fish species, often tuna or billfish species. But it is not a selective method of fishing and often results in significant bycatch. This includes a range of non-target species like sharks, rays, sea turtles, marine mammals, and seabirds which are often injured or killed as bycatch.
Bottom trawling involves dragging heavy weighted nets along the ocean floor. This fishing method is popular with commercial fishing companies, because it makes it easy to catch large quantities of fish in one go. But it also damages the seafloor, releasing carbon and can kill or injure non-target ocean life like coral, fur seals, dolphins and seabirds. You may have watched the reality of bottom trawling (and the benefits of ocean sanctuaries) in Ocean with David Attenborough, if not, add it to your watch list!
Fully protected ocean sanctuaries that ban industrial fishing and mining can protect ocean wildlife and underwater wonderlands for generations to come. Vast, robust sanctuaries create blue havens where ocean wildlife are safe from nets and hooks, and can truly rest, recover, thrive and replenish out into the surrounding waters. Ocean sanctuaries ensure a healthy ocean full of life.
A once-in-a-decade chance to fix what’s falling short
We have a unique opportunity to turn the tide.
The Australian Government is asking for your feedback on how our Commonwealth Marine Parks Network is managed. This is our once-in-a-decade chance to protect ocean wildlife, ban industrial fishing and create more ocean sanctuaries.
As part of the review the Government is asking for submissions from the public to hear from you on what improvements are needed to better protect our vast network of marine parks. Writing a submission is a powerful way to influence government decisions and create real change.
This is the moment to ban industrial activities like bottom trawling and oil and gas mining. But only if they hear from YOU. Add your name!
Greenpeace is calling on the Australian government to:
1. Ban industrial activities from Australia’s Marine Parks Network: Ban industrial activities, such as industrial fishing, seismic blasting and oil and gas mining, from Australia’s marine parks.
2. Create more ocean sanctuaries: Increase fully protected sanctuaries in Australia’s marine parks based on science principles.
3. Connect Australia’s Marine Parks Network to the High Seas: mCreate seascape connectivity by linking Australian marine parks to new high seas ocean sanctuaries.
References
Substantiation that more than half of the Marine Parks Network permits industrial activity comes from a peer-reviewed systematic literature review (Phillips et al. 2025, PLOS One, https://doi.org/10.1371/journal.pone.0307324). The study found that within the Commonwealth Marine Parks Network specifically, “all zones are considered partially protected areas, meaning areas where extractive activities are permitted, except ‘Pink zones’ (Preservation Zones; IUCN Ia) and ‘Green Zones’ (IUCN II).” In other words, every Commonwealth marine park zone type other than the network’s strict no-take sanctuary and national park zones (IUCN Ia and II) permits some form of extractive industrial activity. Since no-take zones are the minority zone type across the network by area, this supports the conclusion that the majority of the network’s area is zoned to permit industrial activity.
DCCEEW Australian Marine Parks spatial dataset (https://fed.dcceew.gov.au/datasets/erin::australian-marine-parks/explore), filtered by zone type. This confirms that 38.43% of the network’s area is zoned as Sanctuary or National Park zones (IUCN Ia and II). These are the no-take categories excluded from the peer-reviewed study’s definition of partially protected/industrial-permitting zones. The remaining 61.57% of the network falls within the zone categories the study classifies as permitting industrial activity (per The MPA Guide definition of “industrial” applied in Phillips et al. 2025), directly corroborating the peer-reviewed finding with current Commonwealth-specific spatial data.
For further information on activities permitted within the Marine Parks Network Zoning, you can refer to the Management Plans zoning and rules for each Marine Parks Network area, for example: Temperate East, Coral Sea, North.
Climate Change
Report: Trawling the Bottom Line
A new report from Greenpeace Australia Pacific advocates for the closure of bottom trawling in Australia’s Commonwealth Marine Parks Network. Bottom trawling continues to be a pervasive threat to ocean life in Australia, with 10 marine parks totalling almost 13 million hectares, allowing bottom trawling.
Australia’s network of marine parks, which is the biggest in the world, covers more than half (52%) of Australia’s Commonwealth domestic waters, but not all parks are created equal. Australia’s Marine Parks Network is divided into different zoning categories, with each zone determining which activities are permitted and the level of protection provided. More than half of the Marine Parks Network allow industrial activities like industrial fishing and oil and gas mining. This includes zoning types that allow destructive fishing by longliners and bottom trawlers, who pillage underwater wonderlands, rip up coral and indiscriminately and violently catch any animal in their path, including turtles, seals and dolphins, all within areas labelled a marine park.
The Federal government has commenced a review into the majority of Australia’s Commonwealth Marine Parks Network management plans. This presents an opportunity to ban industrial activities from our marine parks and create more ocean sanctuaries.

Climate Change
Sewing and Painting the Future

© Harriet Spark / Grumpy Turtle Film / Greenpeace
The banner drop is a distinctive part of the Greenpeace repertoire.
The moment of the unfolding is intrinsically dramatic. It is the reveal; when the moral and scientific truth of a situation is unveiled to the world. The wrong is being labelled—not through a written submission, or a social media post, or a statement in a meeting—but in words emblazoned in real physical space, chosen and occupied with precision, for all to see. There is jeopardy and transgression. And there are consequences—for the activists and for Greenpeace, as well as for the target of the communication. One of the reasons the banner remains such an effective tool in our toolbox is because of its undeniable clarity in cutting through, driving change and accountability in a way that few other tactics can. It is naming the wrong: in giant, clear letters.
We’ve hung these massive messages at environmental crime scenes, corporate headquarters, and iconic landmarks; on government buildings, ships and planes—in locations all around the world, for years.
My own memories unfurl even as I write this, but because the campaign to stop Woodside at Scott Reef is so pressing, what immediately springs to mind are two of our banners in that campaign: one on a crane outside their Perth HQ, and another on some of their corroding industrial junk at sea. What about you? Is there a particular banner that you picture when you think of Greenpeace?
The banners can attract global attention, but they have quiet beginnings. Each one is made by hand, often by volunteers. It is the invisible labour behind each spectacular public moment. One of the key pieces of equipment in our workshop at Rainbow Warrior House is the sewing machine. Sometimes our workshop is full of people and noise; at others it is quiet, the only sound being the gentle, purposeful, whir and buzz of a banner being sewn. It is usually our warehouse manager, Kieran Holmes, on the tools, head over the machine, carefully pouring over the raw canvas or tarp as the banner takes shape. Kieran’s one of those people who seems to be able to turn his hand to almost anything, but you wouldn’t know it because he’s old-school modest. In addition to being incredibly skilled, Kieran’s an all-round beaut human to have in the heart of our headquarters; never too busy to take the time to show a newcomer, or curious visitor, around his domain.
Once the banner is sewn up, the lettering needs to be outlined. This is done on a magnetic wall—a fit-for-purpose feature at Rainbow Warrior House, where the banner is held up with magnets, and the edges of the letters neatly traced from a projection.
Next comes the painting. It usually starts late in the afternoon, sometimes going into evenings and weekends, with volunteers, staff, mates crowded around, brushes in hand. It is a calming meditative feeling of shared purpose, giving each letter its visual heft, the colour building power and presence with each stroke.
Then you stand back, stretch, and look at the message, now ready.
S A V E S C O T T R E E F
Throughout history, every great push for social change has required some form of invisible labour; preparation in the form of quiet things seldom seen, but vital. It is the enabling work of love instantiated in action. And of course, so much of the time it has been women who have done this labour, so that the men could get the chance to make the speeches and stand on the podiums. The inaugural Greenpeace voyage to stop nuclear testing in 1971 had a male-only crew, but wouldn’t have happened without the ideas and work of women behind the scenes.
It is what we do together, after all, that changes the world. Sometimes that work happens on a stage, a ship on the wild seas, or up the side of a building. But mostly, it is the hidden diligence of those who care and contribute to all the enabling work that makes a change once thought impossible, inevitable. It is Kieran at his sewing machine. It was Dorothy Stowe doing the administrative work of the ‘Don’t Make A Wave Committee’ that became Greenpeace.
When we think of social change, it is the sturm and drang that we remember. The drop of the banner, the chant of the crowd, the raising of the new flag. But look behind the curtain, and there’ll be a crew of people who are taking responsibility for the administration, the sewing and the painting, making the food, checking the bus timetables, getting stuff done. And behind them are even more handsinvisibly donating time and trust; the financial, material and expert resources that make it all possible. There’s love, camaraderie and know-how at every stage.
We are social and cooperative creatures by nature. And we human beings have been stitching for millenia, sewing the possibilities of our common future. Political and corporate bullies and algorithmically manipulative platforms would have us forget this, and abandon who we are. But we should be in no doubt that the brighter prospects for ourselves and life on earth continue to be stitched and painted; collaboratively and with love, by the diligent hands of millions of people who care, each day, in every community and city across the world.
With Love,
David
Q & A
I always get great questions when interviewing prospective new team members. One that came up again recently was: “Is Greenpeace actually one organisation?”
Around the world, people know Greenpeace by our one global name, united by a shared mission: securing an Earth capable of nurturing life in all its magnificent diversity, with a particular focus on climate and biodiversity. Behind the scenes, though, we’re organised as a network of 25 legally autonomous national and regional offices, including Greenpeace Australia Pacific, working alongside Greenpeace International.
That structure gives us the best of both worlds: we work together leveraging the power of a global network on the issues that matter most, while each office remains legally independent and deeply connected to the communities, cultures and political realities where we’re embedded. Local knowledge informs global action, and global collaboration strengthens and supports local campaigns.
It’s a model that has enabled Greenpeace to take on some of the world’s biggest challenges for over five decades–while withstanding challenges and attacks from governments and corporations. Global enough to tackle global problems, local enough to understand our communities and the natural places we love.
If you’re curious to learn more, you can read about the Greenpeace Global Network structure here.
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