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Solar power generation in the UK reached a new record over the summer of 2026, as temperatures across the nation soared, according to new analysis by Carbon Brief.

Collectively over June, July and August, solar farms and rooftops generated 8.8 terawatt-hours (TWh) of electricity in the UK*, as shown in the chart below.

Line chart showing that UK solar generation reached an all-time high during record-hot summer 2026

Speaking to Carbon Brief, Chris Hewett, chief executive of trade association Solar Energy UK welcomed the new record, adding that it was driven by “clear skies and continued growth in deployment”.

This surge in generation took place amid the hottest summer on record in the UK, with five heatwaves between May and August.

Summer 2026 was the sixth sunniest on record, with more than 620 hours of sunshine, according to the Met Office. England and Wales – which experienced the most extreme heat – saw their second-sunniest summers on record.

June 2026 was the hottest June in England since records began in 1884, according to Met Office data, while Wales and the UK as a whole experienced their second-warmest June.

It was the driest July for England and Wales since records began in 1836, with some parts of London seeing no rain at all in the month, while Wisley in Surrey had no rain for 62 days.

In England, temperatures peaked at 38.1C at Kew Gardens in London on 13 August.

According to the Met Office, this summer’s record mean temperature was made 130 times more likely by climate change.

Amid these hot and sunny months, solar power generation increased 23% from the same period in 2025. This is double the level of solar generation over the summer of 2021, according to Carbon Brief analysis.

While solar panels can be affected by periods of extreme heat, the longer hours of daylight and higher levels of irradiation over the summer more than offset any efficiency losses.

June, July and August all saw solar set new monthly records for solar generation – July saw the highest solar generation in a calendar month ever, with 3.3TWh meeting 15% of overall electricity demand for the month.

As of the end of August, the total UK solar generation in 2026 stood at 17TWh – 13% higher than the same point in 2025.

The number of solar farms and rooftop installations has grown substantially in recent years, helping to boost generation. Domestic rooftop solar accounts for around 29% of total capacity.

In 2025, the UK’s solar capacity reached 21 gigawatts (GW) by the third quarter of the year, according to UK government figures. This is a jump of 3GW, or 18%, year-on-year, as Carbon Brief reported in January.

(Capacity is the maximum output possible from an electricity generation, whereas generation is what was produced over a certain time period, such as a day, month or year.)

According to the University of Sheffield, the installed solar capacity is now nearly 24GW.

This includes nearly 172,000 solar installations that have been fitted across the UK since the start of 2026, according to recent government figures. In July alone, more than 19,800 rooftop solar panels were installed – the equivalent of one installation every two minutes.

In total, nearly 1.7m households in the UK now have solar panels installed.

Over 26 heatwave days this summer – periods of at least three days when temperatures exceed the Met Office’s county-level heatwave temperature threshold – UK households with rooftop solar panels avoided an estimated £86.7m in electricity costs, according to analysis by Utility Bidder.

Talking about the surge in solar generation this summer, Hewett says:

“[It] not only kept bills down for people with solar and batteries in their homes, but helped keep overall power prices much lower than they would have been if Britain had been relying on more gas generation during the day”.

Despite the record generation, no new half-hourly solar power output record was set in the summer of 2026. This still stands at 15.2 megawatts (MW) on 23 April 2026.

* This article refers to the UK throughout, but strictly relates to the island of Great Britain, made up of England, Scotland and Wales. Northern Ireland is part of the separate, all-Ireland electricity system.

The post Analysis: UK solar power hits record high over summer 2026 appeared first on Carbon Brief.

Analysis: UK solar power hits record high over summer 2026

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Climate Change

Coal in a green mask: Indonesia’s co-firing plan will harm, not help, the climate 

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Muhammad Zulfikar Rakhmat is director of the China-Indonesia Desk at the Center of Economic and Law Studies (CELIOS). Bhima Yudhistira Adhinegara is executive director of CELIOS.

Indonesia bills its plans to mix wood with coal at dozens of power plants as a way to cut electricity generation emissions as the country transitions towards clean energy. But look closer, and the biomass co-firing plan could do far more harm than good. 

Biomass co-firing involves mixing a small amount of wood or other plant matter, usually wood chips or wood pellets, into the coal that a power plant burns.

State electricity company PLN wants to use it at 52 coal-fired plants across the Southeast Asian nation – a target set out in its national electricity supply business plan and tied to Indonesia’s pledge, under its Nationally Determined Contribution to the Paris Agreement, to raise renewables to 23% of the energy mix. PLN originally aimed to secure 10.2 million tonnes of biomass a year by 2025; that target has already slipped to 2031, as the country struggles to line up enough supply. 

Most plants only mix in a small amount of wood, often between 1% and 5% of the fuel load, meaning they do not even have to change machinery. In truth, it lets coal plants keep doing what they have always done, just with a little wood added to the mix.

That presents two big problems.

    Firstly, creating additional demand for wood would put further deforestation pressure on the country’s thick and biodiverse tropical forests, already at risk from mining and palm oil plantations.

    Secondly, by making old coal plants look a little greener on paper, the plan could hand them a reason to keep operating well beyond when they would otherwise be retired, meaning the fleet keeps emitting for longer than a genuine phase-out would allow.

    This is not a real climate solution. It is coal wearing a green mask.

    A threat to forests

    To meet its co-firing mandate, Indonesia would need more than 10 million tonnes of wood pellets every year, an area of forest equivalent to 3.27 million football fields, according to a 2024 assessment by a group of NGOs.

    The same report warned this could push deforestation as high as 2.1 million hectares a year, and found that a 10% cut in coal use through co-firing could threaten 10 million hectares of untouched forest in the areas where wood is collected. At Indonesia’s biggest power plants alone, switching just 10% of coal to wood could clear an area of forest roughly 35 times the size of Jakarta.

    PLN and the forestry companies that supply it insist the wood comes from dedicated “energy plantation forests” – land set aside to grow fast-growing trees for fuel, not from clearing natural forest. But the same assessment found that of the 1.2 million hectares already designated for these plantations, more than 400,000 hectares still contain undisturbed tropical forest, which will come under growing pressure as demand rises. The claim that this wood comes from already-degraded land does not hold up to scrutiny. 

    Advocates of co-firing say wood is a clean fuel because trees can grow back. But when old natural forests are cleared to make way for fast-growing forestry plantations to grow trees for fuel, they release carbon that took decades or centuries to build up. 

    One study, by the Centre for Research on Energy and Clean Air (CREA), estimated that co-firing with just 10% wood across 52 power plants could create up to 26.5 million tonnes of carbon dioxide-equivalent emissions each year, once the clearing of land and the production of wood pellets are counted.

    Wood pellets for export 

    Government rules have made this easier, not harder. Companies that already hold industrial timber plantation permits can convert them into energy plantations, giving them a ready-made legal route into the wood pellet business without applying for new forest land.

    Indroyono Soesilo, chairman of the Indonesian Forestry Entrepreneurs Association (APHI), has publicly called on the government for tax breaks and relief from state forestry levies in exchange for making that switch.

    Research by Trend Asia found that the push into energy plantations for biomass is dominated not by small or informal loggers but by large companies already notorious for deforestation, including APP Group, Korindo Group, Barito Pacific and Wilmar International. In short, some of the same companies long associated with clearing forests are being given an easier path and a green label to keep doing it.

      Much of this wood does not even stay in Indonesia. Japan and South Korea have bought more than 99% of Indonesia’s wood pellet exports since 2021, using them to meet their own clean energy targets.

      Perhaps the biggest risk in Indonesia’s co-firing plan is what it could do to the coal fleet itself. Mixing in a small amount of wood does not require a plant to shut down or upgrade. It simply gives the plant a reason to keep running, dressed up as progress. Every year a coal plant stays open because of a paper-thin green label is a year that real clean energy, such as solar and wind, is pushed further down the road.

      None of this means biomass is always bad. Using leftover farm waste or city waste to make power can make sense.

      But the scale of Indonesia’s co-firing plan cannot be met by leftovers alone, which is exactly why forests are being pulled into the supply chain. The countries and banks funding Indonesia’s energy transition, along with Japan and South Korea, should stop counting co-firing as a climate win.

      Real progress means closing coal plants, not feeding them wood.

      The post Coal in a green mask: Indonesia’s co-firing plan will harm, not help, the climate  appeared first on Climate Home News.

      Coal in a green mask: Indonesia’s co-firing plan will harm, not help, the climate 

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      Climate Change

      Loss and damage fund agrees $20m for Nepal but rich nations warn it should not set precedent

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      The board of the UN’s Fund for Responding to Loss and Damage agreed on Thursday to set aside $20 million to help Nepal recover from the devastating climate-driven flood it suffered in August.

      At an extraordinary online meeting, board members unanimously invited Nepal’s government to submit a proposal for how to use the money, which will be considered at a future board meeting.

      The board’s co-chair Camila Minerva Rodriguez described the decision as “truly historic” as it is the first time the new fund has allocated any money since it was set up three years ago. It is expected to approve its first set of projects at its next board meeting in December.

      Maheshwar Dhakal, a senior official at Nepal’s climate ministry, told the meeting the decision was “a powerful expression of humanity, compassion, solidarity and hope” and, for the flood victims, a “recognition of their suffering, respect for their dignity and hope that they are not alone in their darkest hour”.

      A woman carries belongings recovered from her destroyed home following flash floods in Nepal
      A woman carries belongings recovered from her destroyed home following flash floods, on August 29, 2026 in Devighat, Nepal. (Photo: Ezra Acayan/Getty Images)

      While board members were united in approving the $20 million, plus $1.6 million of administrative costs, representatives of developed and developed countries were divided over the extent to which the decision should set a precedent for the fund’s long-term way of operating.

      Germany and Czechia’s board members said it should not set a “precedent” while Japan’s representative said the decision is “truly exceptional” and that the fund’s support must be “in accordance with established rule and procedure”.

      Learning the lessons?

      Responding, Pakistan’s Ali Sheikh said the lessons from the Nepal case should “feed the long-term model and its work on rapid disbursement” of funds.

      He added that he had heard Jan Dusik, Czechia’s board member saying that “we are open for learning but not in setting precedent”. “Please do not define the boundaries for learning,” he emphasised.

      Sheikh complained that the decision approved by the board – the result of negotiations between a group of four developed and four developing-country representatives – was narrower than developing countries had hoped for.

      “We are saying it is a one-time and Nepal-only window, a sentiment against which many developed countries have raised their voice,” he said, adding there had been no time to review the decision.