UK electricity generation mix 2026: coal-free power and record renewables

The United Kingdom (UK) now has a simple progress fact: a power system that relied heavily on coal in 2010 recorded no coal generation in the provisional 2025 figures, then started 2026 with renewables supplying 53.1% of electricity generation. That is not the whole net zero transition, but it is real change in the machinery people use whenever they switch on the lights.

The clean-power story is easiest to see at the grid level. Fewer coal plants, more wind farms and more renewable generation have changed the centre of the UK power mix rather than adding a small green layer around the edge.

The next part is less tidy. Heat pumps, electric vehicles, industry, data centres and electrified public transport all ask more of the same system. A cleaner grid only cuts wider emissions if the UK keeps building clean generation, connects it on time, adds storage and reduces the role of gas without weakening reliability.

That makes the electricity mix a useful progress test. The numbers show that large physical change is possible. They also show where the next constraint sits.

For the real-time version of the same story, see the Progress check on Great Britain's 98.8% zero-carbon electricity record, which shows how close the grid can get to fossil-free operation during a favourable half-hour.

Quick answer

The number that matters

That single quarter should not be treated as a full-year verdict. Weather, demand, outages and imports can all move the mix around. But it is still a clear marker of how far the system has moved.

In 2010, renewables generated about 26.2 TWh across the whole year. In the first three months of 2026 alone, renewables generated 43.7 TWh. The country now produces more renewable electricity in a quarter than it used to produce in a year.

The coal story is sharper. In 2010, coal generated about 107.6 TWh of UK electricity. In the provisional 2025 figures, it generated zero. In the first quarter of 2026, it was still zero. A fuel that once supplied more than a quarter of UK electricity has disappeared from the generation figures.

The 2026 update

The June 2026 Energy Trends release adds a useful new checkpoint. In the first quarter of 2026, total UK electricity generation rose 1.3% to 82.3 TWh, while electricity demand fell 0.6% to 88.7 TWh. Renewable generation rose 18% year on year to 43.7 TWh.

Wind did most of the work. It reached a quarterly record of 29.3 TWh, helped by both onshore and offshore generation. Solar reached 2.7 TWh. Low carbon generation reached 63.8% of total generation even though nuclear generation fell to 8.8 TWh.

Fossil fuel generation fell 16% to 27.0 TWh. Gas made up almost all of that at 26.6 TWh, or 32.3% of generation. So the story is not that fossil power has vanished. It is that coal has gone, renewables are now large enough to lead the mix in strong quarters, and gas has become the fuel the system still leans on when other parts are tight.

Generation mix: 2010, 2025 and early 2026

What changed most

The biggest change is the removal of coal from the electricity system. Coal was once a large part of UK power generation. By 2025, it had disappeared from the generation figures.

The second change is the scale-up of wind. The shift is not just that more wind farms exist. It is that wind now carries enough generation weight to change the national power mix. Offshore wind is especially important because it has become a large industrial, infrastructure and seabed-leasing story as well as an emissions story.

The next test is capacity buildout. The guide to UK offshore wind capacity and the 2030 target compares the latest official offshore wind data with the 43 to 50 gigawatt (GW) range in the Clean Power 2030 plan. The companion guide to UK solar capacity in 2026 shows the same delivery-rate question for the 45 to 47GW solar range.

The third change is that total UK generation is lower than it was in 2010. Domestic generation fell from about 382.1 TWh in 2010 to 293.6 TWh in 2025. Some of that reflects demand, efficiency, imports and the way the system is supplied. It means shares should always be read with the absolute generation numbers beside them.

Why this is worth noticing

This is one of the clearer examples of UK climate progress because it shows physical system change. The evidence is not just a target, pledge or corporate claim. The generation mix itself changed.

That matters for net zero because electricity is the backbone of many next-stage climate decisions. Electric vehicles, heat pumps, industrial electrification, data centres and some hydrogen pathways all depend on power. A cleaner grid makes those decisions more credible than they would be in a coal-heavy system.

For the broader net zero context, see our guide to what net zero means. For the long-term policy test, the Seventh Carbon Budget guide explains why the next phase moves beyond power-sector progress into buildings, transport, industry, land use and removals.

Where the work moves next

The electricity mix does not prove that the whole economy is on track. It proves that one part of the system has changed substantially.

That distinction matters because some of the next cuts are harder. Closing coal plants is not the same challenge as retrofitting homes, changing industrial processes, cutting agricultural methane, managing aviation demand or building carbon removals that can be counted credibly.

It also does not mean fossil power has disappeared. Gas still generated 93.2 TWh in 2025 and 26.6 TWh in the first quarter of 2026. As nuclear output changes, demand rises and weather shifts renewable output, gas still plays a large balancing role. The planned Sizewell B extension to 2055 would retain about 3% of current UK electricity supply, but it will depend on continued investment and a valid safety case.

Why grids and demand decide the next test

The positive story is that the UK has shown electricity generation can change at scale. The next constraint is delivery: connecting clean generation, building transmission and distribution capacity, managing peaks, adding battery storage and keeping the system reliable as more sectors electrify.

This is why the power mix connects directly to investment. The World Energy Investment 2026 guide explains why grids, storage and electrification are becoming central to the energy transition. The COP31 electrification target guide explains the same pressure at global policy level: more clean electricity only matters if the system can use it.

So the best reading is balanced. The UK electricity mix is a real progress story. It is also a reminder that the next phase is less about proving clean power can grow and more about proving the system can absorb, balance and extend it.

What to watch next

• Whether renewable generation stays above half of UK generation in later 2026 data.
• Whether gas generation falls in absolute terms, not just as a share.
• Whether nuclear availability recovers or keeps adding pressure to gas and imports.
• Whether grid connection queues, planning and network investment speed up enough to use new renewable capacity.
• Whether heat pumps, electric vehicles and industry electrification increase electricity demand faster than clean generation grows.
• Whether carbon intensity keeps falling as the system moves from coal exit to gas reduction.

Useful source links

• GOV.UK: Energy Trends, UK electricity
• GOV.UK: Energy Trends, June 2026
• GOV.UK: fuel used in electricity generation and electricity supplied, Energy Trends 5.1, June 2026
• Feature image: wind turbines and power lines near Rye, East Sussex, photographed by Diliff on Wikimedia Commons