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Electricity demand on the island of Great Britain has been fully covered by the output of clean-energy sources for a record 87 hours in 2025 to date, new Carbon Brief analysis shows.

This is up from just 2.5 hours in 2021 and 64.5 hours in all of 2024, ahead of the government’s clean-power target for 2030.

The target aims for 95% of the electricity generated in the country in 2030 to come from low-carbon sources, as well as for 100% of national demand to be met without fossil fuels.

The National Energy System Operator (NESO) has a separate target to run the electricity grid without fossil fuels for at least 30 minutes by the end of 2025.

100% clean electricity

The government’s 2030 target has been widely reported as a goal for 95% clean power, with no more than 5% of electricity generation coming from gas.

However, there is a second part to its goal, which is that 100% of national demand in 2030 should be covered by domestic clean-electricity generation.

The two elements mean that the country would need to generate 105% of the electricity it needs – no more than 5% of which would come from gas – with the surplus supply being exported.

The 2030 target relates to electricity supply and demand across the whole year. In 2025 to date, 66% of electricity generation was from nuclear or renewables, which covered 59% of demand. (The difference is due to net imports covering around 17% of demand.)

As such, the 2030 targets are a long way from being met.

Still, there have been an increasing number of periods where 100% of electricity demand on the island of Great Britain has been covered by domestic clean power. (Northern Ireland is part of the separate all-Ireland grid.)

The first ever was a 2.5-hour period from 3.30-6.00am on 30 December 2021, when demand averaged 24.4 gigawatts (GW) and the output from clean-energy sources was 24.9GW.

During 2022-2024, clean-energy supply was sufficient to cover 100% of demand for a total of around 70 hours each year, as shown in the figure below.

In 2025 to date, such periods are becoming increasingly frequent. As of 28 September, demand in Great Britain had been fully covered by clean electricity during a record 87 hours.

Bar chart showing that Great Britain has been fully powered by clean energy for a record 87 hours in 2025 to date
Number of hours per year when clean-electricity generation was sufficient to cover 100% of demand. Source: Carbon Brief analysis of NESO data.

This translates to some 1.3% of hours in 2025 to date, far short of the 2030 target. However, this year’s figure is up 50-fold from 0.03% of hours in 2021 – and double the 0.7% share in 2024.

Cleaner electricity mix

During the periods in 2025 to date where at least 100% of demand was being covered by clean generation, wind power was contributing an average of 72% of demand, followed by 18% from nuclear, 10% from solar, 4% from biomass and 1% from hydro.

This means that, in total, low-carbon sources were generating 105% of national demand during such periods in 2025. Over these periods, gas was also generating enough, on average, to meet 13% of demand. As a result, the country was exporting the equivalent of 19% of demand via its interconnectors with Ireland, France, Belgium, Denmark, Norway and the Netherlands.

The figure below illustrates the most recent period when 100% of demand was being covered by clean generation, which took place early on Friday 12 September 2025.

For a four-hour period that morning – from 2am until 6am – clean-energy sources (dark blue) were generating enough electricity to cover 100% of national demand (red line).

During this period, clean sources generated an average of 23.5 gigawatts (GW), including 19.1GW from wind and 3.3GW from nuclear. This was more than the average demand of 22.7GW. Gas still generated an average of 3.1GW (black), resulting in net exports of 4.3GW (light blue).

Chart showing that clean energy met 100% of GB electricity demand for four hours on 12 September
Half-hourly electricity demand (red line) and output by source (coloured areas), GW. Source: Carbon Brief analysis of NESO data.

To date, the record for the longest stretch where 100% of demand was being covered by clean energy stands at 15 hours, from midnight on 25 May 2025 through to 3pm on 26 May.

To meet its clean-power target, the government will need to ensure that this record is extended from just 15 hours in 2025 up to a full year by 2030.

A key test of its ability to do so will come in the seventh auction round for “contracts for difference” (CfDs), which offers fixed-price government-backed deals for new clean-energy developers. The results of this round are due to be announced as early as December 2025.

Until then, NESO will be hoping to meet its target – first set in 2019 – of running the GB grid without any fossil fuels for a short period of time, which it refers to as “zero-carbon operation”.

This target only applies to the transmission grid – effectively, the motorways of the network – meaning it excludes almost all solar power and smaller onshore windfarms.

Craig Dyke, NESO’s director of system operations, previously told Carbon Brief that the first-ever period of at least 30 minutes of “zero-carbon operation” was likely to take place this autumn.

Dyke added that NESO was “confident” it could meet the target, which he said would be “absolutely groundbreaking and pretty much world leading”.

The post Analysis: Great Britain has run on 100% clean power for record 87 hours in 2025 so far appeared first on Carbon Brief.

Analysis: Great Britain has run on 100% clean power for record 87 hours in 2025 so far

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Greenpeace urges governments to defend international law, as evidence suggests breaches by deep sea mining contractors

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SYDNEY/FIJI, Monday 9 March 2026 — As the International Seabed Authority (ISA) opens its 31st Session today, Greenpeace International is calling on member states to take firm and swift action if breaches by subsidiaries and subcontractors of The Metals Company (TMC) are established. Evidence compiled and submitted to the ISA’s Secretary General suggests that violations of exploration contracts may have occurred.

Louisa Casson, Campaigner, Greenpeace International, said: “In July, governments at the ISA sent a clear message: rogue companies trying to sidestep international law will face consequences. Turning that promise into action at this meeting is far more important than rushing through a Mining Code designed to appease corporate interests rather than protect the common good. As delegations from around the world gather today, they must unite and confront the US and TMC’s neo-colonial resource grab and make clear that deep sea mining is a reckless gamble humanity cannot afford.”

The ISA launched an inquiry at its last Council meeting in July 2025, in response to TMC USA seeking unilateral deep sea mining licences from the Trump administration. If the US administration unilaterally allows mining of the international seabed, it would be considered in violation of international law.

Greenpeace International has compiled and submitted evidence to the ISA Secretary-General, Leticia Carvalho, to support the ongoing inquiry into deep sea mining contractors. This evidence shows that those supporting these unprecedented rogue efforts to start deep sea mining unilaterally via President Trump could be in breach of their obligations with the ISA.

The analysis focuses on TMC’s subsidiaries — Nauru Ocean Resources Inc (NORI) and Tonga Offshore Mining Ltd (TOML) — as well as Blue Minerals Jamaica (BMJ), a company linked to Dutch-Swiss offshore engineering firm Allseas, one of TMC’s subcontractors and largest shareholders. The information compiled indicates that their activities may violate core contractual obligations under the United Nations Convention on the Law of the Sea (UNCLOS). If these breaches are confirmed, NORI and TOML’s exploration contracts, which expire in July 2026 and January 2027 respectively, the ISA should take action, including considering not renewing the contract.

Letícia Carvalho has recently publicly advocated for governments to finalise a streamlined deep sea mining code this year and has expressed her own concerns with the calls from 40 governments for a moratorium. At a time when rogue actors are attempting to bypass or weaken the international system, establishing rules and regulations that will allow mining to start could mean falling into the trap of international bullies. A Mining Code would legitimise and drive investment into a flagging industry, supporting rogue actor companies like TMC and weakening deterrence against unilateral mining outside the ISA framework.

Casson added:Rushing to finalise a Mining Code serves the interests of multinational corporations, not the principles of multilateralism. With what we know now, rules to mine the deep sea cannot coexist with ocean protection. Governments are legally obliged to only authorise deep sea mining if it can demonstrably benefit humanity – and that is non-negotiable. As the long list of scientific, environmental and social concerns with this industry keeps growing, what is needed is a clear political signal that the world will not be intimidated into rushing a mining code by unilateral threats and will instead keep moving towards a moratorium on deep sea mining.” 

—ENDS—

Key findings from the full briefing:

  • Following TMC USA’s application to mine the international seabed unilaterally, NORI and TOML have amended their agreements to provide payments to Nauru and Tonga, respectively, if US-authorised commercial mining goes ahead. This sets up their participation in a financial mechanism predicated on mining in contradiction to UNCLOS.
  • NORI and TOML have signed intercompany intellectual property and data-sharing agreements with TMC USA, and the data obtained by NORI and TOML under the ISA exploration contracts has been key to facilitating TMC USA’s application under US national regulations.
  • Just a few individuals hold key decision-making roles across the TMC and all relevant subsidiaries, making claims of independent management ungrounded. NORI, TOML, and TMC USA, while legally distinct, are managed as an integrated corporate group with a single, coordinated strategy under the direct control and strategic direction of TMC.

Greenpeace urges governments to defend international law, as evidence suggests breaches by deep sea mining contractors

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After a Decade of Missteps, a Texas City Careens Toward a Water-Shortage Catastrophe

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Officials in Corpus Christi expect a “water emergency” within months and fully run out of water next year. That would halt jet fuel supplies to Texas airports, fuel a surge in gasoline prices and trigger an “economic disaster” without precedent, former officials said.

CORPUS CHRISTI, Texas—The imminent depletion of water supplies in Corpus Christi threatens to cut off the flow of jet fuel to Texas airports and other oil exports from one of the nation’s largest petroleum ports, triggering potential shockwaves through energy markets in Texas and beyond.

After a Decade of Missteps, a Texas City Careens Toward a Water-Shortage Catastrophe

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Is the FBI Investigating Environmental Activists?

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A recent visit by an FBI agent to a climate activist hints at a broadening Trump administration effort to target political opponents.

NEW YORK CITY—The group in the Brooklyn studio seemed harmless. There was a graduate student, a Yiddish teacher, a hairdresser. Fifteen people had gathered on a Wednesday night for a training offered by Extinction Rebellion NYC and Climate Defiance, two climate activist groups that engage in nonviolent civil disobedience and theatrical protest.

Is the FBI Investigating Environmental Activists?

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