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
Green Climate Fund picks locations for five developing country hubs
The UN’s flagship climate fund has selected five locations for its new regional offices, a move aimed at bringing it physically closer to developing countries and making its finance easier to access.
After fraught discussions during a meeting last week, the board of the Green Climate Fund (GCF) decided in a secret vote on Saturday to open regional offices in Panama City, Amman in Jordan, Suva in Fiji, Nairobi in Kenya and Abidjan in Côte d’Ivoire. The African office will be split across two locations to better serve the continent with the largest number of countries and projects supported by the fund.
The decision marks a significant shift for the fund, which has operated from its headquarters in Songdo, South Korea, since its launch in 2013.
“This is a landmark moment for [the] GCF,” said the fund’s executive director Mafalda Duarte. “It has taken a lot of work, careful negotiation and persistent advocacy for a model that will bring us closer to the countries, to our partners and the communities we were created to serve”.
‘Less delay, more action’
The new offices are expected to act as the GCF’s front line, working more closely with governments, the private sector and civil society to improve access to climate finance and support the delivery of projects aimed at cutting emissions and strengthening resilience to climate impacts.
Welcoming the decision in a LinkedIn post, Fiji’s Permanent Secretary for the environment and climate change Sivendra Michael described it as “a win for the entire Pacific”, citing “long hours” and “tough negotiations” behind the outcome. “Less delay, more action — real support where it matters most,” he added.
A total of 43 countries applied to host the new offices, with 16 making a final shortlist after the GCF secretariat assessed bids on criteria including cost, connectivity and the ability to attract a “world-class workforce” through quality of life and access to international schools.
Panama emerged as the top-ranked location overall, according to a document seen by Climate Home News, while some selected hosts, including Amman and Abidjan, scored lower than rival candidates in their regions.
Establishing the new hubs is expected to cost an initial $6.5 million, but the fund anticipates these upfront expenses will be offset over time through operational savings, including lower staff and travel costs.
First Palestinian entity approved
The GCF board also accredited the first organisation in Palestine that will be able to directly apply for and access funding.
Created by the Palestinian Authority in the West Bank, the Municipal Development and Lending Fund supports local infrastructure projects and services. Working with partners, including the World Bank, it is developing projects to help communities cope with escalating climate risks such as drought and extreme heat.
In the West Bank, which is occupied by Israel, just under half of the population lives in areas classified as having high to very high climate exposure, according to a recent study.
The post Green Climate Fund picks locations for five developing country hubs appeared first on Climate Home News.
Green Climate Fund picks locations for five developing country hubs
Climate Change
Island nations fight to save cultural heritage from climate change
Farmers and fishermen in the Maldives have long relied on an ancient calendar to guide their daily lives.
The Nakaiy system divides the year into 27 distinct periods, each named after a star or constellation in the night sky.
Any one period in the calendar tells you about expected weather and tidal patterns, navigational routes, and fishing conditions. The Nakaiy was created through centuries of careful observation and local knowledge, passed down through families as an essential tool for survival.
But things are now changing. The climate crisis is leading to more extreme weather events across the Indian Ocean island nation and upending the Nakaiy calendar.
“When you go and speak to communities and ask them what kind of impacts they are facing, a lot of elders will tell you that the weather, it doesn’t follow the calendar anymore,” explained Aishath Reesha Suhail, a programme officer in the Maldives’ Ministry of Tourism and Environment.
As the effects of climate change worsen, it is a real prospect that the Nakaiy may be abandoned by local people, representing a major cultural loss to the Maldives.
‘Systemic and growing threat’
With extreme weather becoming the norm, communities are observing a domino effect of consequences in their everyday lives. The slow onset of heritage loss is now being seen across continents, but notably among small islands in remote parts of the ocean.
“Climate change represents a systemic and growing threat to cultural heritage worldwide,” a UNESCO spokesperson told Climate Home, adding that the World Heritage Committee has identified climate change as “one of the most significant long-term risks affecting properties across all regions.”
UNESCO, the UN body for education, science and culture, defines the loss of cultural heritage as “the erosion of traditional knowledge systems, craftsmanship, social practices and identity, particularly where communities are displaced or livelihoods disrupted”. A clear example is historical sites and even entire islands washed into the ocean as a result of rising sea levels and coastal erosion.
The Maldives is dealing with such a situation now. The Koagannu Cemetery is a 900-year-old resting place, located on the country’s southernmost atoll, a mere 50 metres from the shoreline. The monument’s intricate coral gravestones are being actively threatened by the encroaching Indian Ocean.
The government and local community have responded to this challenge with emergency protection measures. Sandbags and concrete structures have been installed along the coastline, complemented by large numbers of palm trees to create a seawall. A wider solution is ‘beach nourishment’, a common practice in the Maldives where sand from elsewhere is brought in to replace what has been lost through erosion. Taken together, these solutions have so far protected the cemetery.
Among the many issues climate change creates, cultural heritage is not always front of mind. In the Maldives, one of the main barriers people face is awareness. “Most of what we are dealing with relates to the erosion of our islands along with areas such as fisheries… but we are quite limited in our capacity to do something about it,“ Suhail said.
“We don’t understand the full breadth of the issue at present because we haven’t been able to do extensive research on the matter,” she added. However, assessing the extent of the damage – and how to respond effectively – is a key priority for the government, outlined in its latest climate plan, known as a Nationally Determined Contribution, and as part of its National Adaptation Plan process.
Fishing is at the core of the country’s culture and identity, employing thousands of people. Most dishes include fish – “we have it for breakfast, lunch and dinner,” Suhail noted – but the climate crisis and overfishing are shifting how and when communities can fish. Tuna makes up 98% of all fish caught in the Maldives, but warmer ocean temperatures are changing migratory patterns, pushing the species into deeper, colder waters.
As a critical economic and cultural resource, the government has outlined a range of solutions to protect the fisheries sector in its first Biennial Transparency Report to the UN. These include using real-time tracking data to improve the efficiency of fishing operations; investing in canneries to increase fish storage; and diversifying away from tuna through marine farming.


Culture and nature go hand-in-hand
The same pattern is playing out elsewhere.
Palau and the Maldives are not close to one another. The two states are separated by around 4,000 miles and sit in different corners of the ocean. But both are experiencing very similar climate challenges, based on their position as a set of scattered, low-lying islands surrounded by an imposing body of blue water.
In the same way as the Maldives, Palau’s cultural heritage is closely tied to “land, coastlines and traditional food systems,” according to Toni Soalabla, at the Palau Office of Climate Change.
“Many of the places that hold stories, history and identity of our communities are located along the coast and are increasingly exposed to erosion and sea level rise,” she said.
One of these places is Ngerutechei village, reportedly the oldest in Palau, and home to ancient stone paths and carvings. The village provides a glimpse into the past social values and culture of the people in this western Pacific nation.
As part of the development of Palau’s National Adaptation Plan, the government has worked with local leaders to identify similar sites of cultural significance. The plan encourages communities to use their own knowledge to create protective measures for these sites.
Climate change is also prompting communities to take up traditional land and food practices again. These include cultivating taro, a stable food source that has historically supported water, soil and food security on the islands.
“These systems developed over generations in response to local environmental conditions, so strengthening them today is both a climate adaptation measure and a way of maintaining cultural knowledge that might otherwise fade,” said Soalabla.
Cultural practices in Palau have developed alongside the natural ecosystems that people rely on to survive. It is within this context that researchers believe adaptation policies should be created. Recognising this relationship “can strengthen both community identity and environmental resilience at the same time”, according to Soalabla.




Heritage on the global stage
The issue of cultural loss has not gone unnoticed in international climate negotiations.
Small island states such as the Maldives have used their role at the UN to push for greater awareness and action, with some key successes.
In 2015, the Paris Agreement established a Global Goal on Adaptation (GGA) which recognised that countries needed to do something about climate change now and not later. However, it took six years before a framework and a set of adaptation targets were agreed at the UN climate summit in Glasgow to pursue this goal.
From this came the establishment of seven overall themes – from poverty eradication to access to health – to guide adaptation action and a set of around 60 indicators to measure progress against the targets.
World leaders invited to see Pacific climate destruction before COP31
Emilie Beauchamp, an adaptation specialist at the International Institute for Sustainable Development (IISD), said that “cultural heritage was highlighted as one of the global priorities [of the GGA Framework] and is one of the seven themes, so it is considered very important by the international community.”
The much-debated set of indicators, only finalised in Belém at last year’s COP30, include five related to cultural heritage with a focus on preserving cultural practices and important sites that are “guided by traditional knowledge, Indigenous Peoples’ knowledge and local knowledge systems”. A spokesperson for UNESCO said the inclusion of heritage indicators “marks an important recognition that climate impacts extend beyond economic losses”.
While critics said the set of final indicators was rushed through by the Brazilian presidency, they now serve as guidance for national governments that wish to implement plans to protect their common heritage. The missing piece of the puzzle remains how to finance these plans – something notably absent from the Belém text, which made clear that the adaptation indicators “do not create new financial obligations or commitments, nor liability or compensation”.
The lack of financial commitments proved disappointing for many small states grappling with how to prevent their cultural history from being entirely forgotten, especially at a time when adaptation finance remains below requirements. A recent UNEP report found that developing nations would need an estimated US$310 billion per year in 2035 to adapt to climate change, while current public financing was around $26 billion.
At these low levels “only a small percentage of what the framework outlines could be implemented,” according to Beauchamp.


The challenge of cultural heritage
When looking at low-lying islands on a map, they can appear as specks of land amid a vast ocean. Many of the stories from these remote places go unnoticed. But the specks represent millennia of human culture that is slowly being lost to the ocean.
While the international community has now recognised the problem and solutions exist, the recurring issue of scarce finance may prevent governments from taking sustained action. Island communities have already been forced to move home as sea levels rise, leaving behind their cultural connections to a place.
The value of any cultural asset, or of human heritage, can be judged by how it is engaged with over generations. Without human intervention, many historical sites, language, cuisine and other local customs would become a forgotten part of history. The rapid onset of climate change brings the role of cultural heritage into sharp relief, challenging communities to decide in real time what they value, what deserves saving, and how to achieve that.
Stories of cultural loss are not confined to small islands but it is here where the challenge is presenting most acutely. The experiences of these vulnerable nations in protecting their heritage will provide the litmus test for effective adaptation responses elsewhere.
Adam Wentworth is a freelance writer based in Brighton, UK.
(Main image: The Isdhoo Havitha is an ancient Buddhist monastery in the Maldives, located moments from the shoreline. Photo: Ashwa Faheem)
The post Island nations fight to save cultural heritage from climate change appeared first on Climate Home News.
Island nations fight to save cultural heritage from climate change
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