UK electricity in September 2025
Day by day: how Great Britain made its electricity in September 2025.
In September 2025, wind made 35% of Britain's electricity, then gas (22%). Renewables made 51%, against 41% a year earlier; average carbon intensity 108 g/kWh.
Electricity generated each day, September 2025
GWh a day
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the numbers
- Nuclear
- Gas
- Hydro
- Imports
- Biomass
- Pumped storage
- Wind
- Solar
- Other
Share of electricity, by source
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the numbers
Carbon intensity
g CO₂ per kWh, daily average
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the numbers
September 2025 in total
| Source | Electricity | Share |
|---|---|---|
| Wind | 7,842 GWh | 35.1% |
| Gas | 4,884 GWh | 21.9% |
| Imports | 3,383 GWh | 15.2% |
| Nuclear | 2,134 GWh | 9.6% |
| Solar | 1,709 GWh | 7.7% |
| Biomass | 1,617 GWh | 7.2% |
| Other | 409 GWh | 1.8% |
| Hydro | 250 GWh | 1.1% |
| Pumped storage | 85.4 GWh | 0.4% |
| Renewable (wind, solar, hydro, biomass) | 51.2% | |
| Low carbon (renewable plus nuclear) | 60.7% |
Standout days
- Windiest day453.8 GWh of windMon, 15 September 2025
- Highest wind share59.3%Mon, 15 September 2025
- Sunniest day84.4 GWh of solarMon, 22 September 2025
- Cleanest day51 g/kWh averageMon, 15 September 2025
- Dirtiest day217 g/kWh averageMon, 29 September 2025
Every day
| Day | Total | Wind | Gas | Nuclear | Solar | Carbon |
|---|---|---|---|---|---|---|
| Mon 1 Sept | 776 GWh | 52% | 13% | 12% | 9% | 64 g |
| Tue 2 Sept | 747 GWh | 27% | 29% | 13% | 7% | 133 g |
| Wed 3 Sept | 735 GWh | 34% | 17% | 13% | 6% | 97 g |
| Thu 4 Sept | 740 GWh | 28% | 24% | 13% | 8% | 117 g |
| Fri 5 Sept | 734 GWh | 19% | 27% | 12% | 11% | 138 g |
| Sat 6 Sept | 681 GWh | 37% | 12% | 12% | 10% | 76 g |
| Sun 7 Sept | 735 GWh | 53% | 11% | 11% | 6% | 61 g |
| Mon 8 Sept | 718 GWh | 23% | 25% | 11% | 11% | 125 g |
| Tue 9 Sept | 758 GWh | 25% | 31% | 10% | 9% | 142 g |
| Wed 10 Sept | 787 GWh | 51% | 11% | 10% | 5% | 60 g |
| Thu 11 Sept | 789 GWh | 54% | 10% | 10% | 8% | 55 g |
| Fri 12 Sept | 778 GWh | 52% | 12% | 10% | 9% | 59 g |
| Sat 13 Sept | 684 GWh | 41% | 13% | 12% | 10% | 68 g |
| Sun 14 Sept | 679 GWh | 40% | 15% | 12% | 3% | 85 g |
| Mon 15 Sept | 766 GWh | 59% | 10% | 8% | 7% | 51 g |
| Tue 16 Sept | 775 GWh | 51% | 14% | 8% | 8% | 69 g |
| Wed 17 Sept | 741 GWh | 50% | 12% | 8% | 3% | 70 g |
| Thu 18 Sept | 787 GWh | 52% | 17% | 8% | 5% | 82 g |
| Fri 19 Sept | 749 GWh | 35% | 23% | 8% | 8% | 109 g |
| Sat 20 Sept | 682 GWh | 33% | 24% | 9% | 3% | 120 g |
| Sun 21 Sept | 716 GWh | 44% | 14% | 8% | 10% | 74 g |
| Mon 22 Sept | 767 GWh | 28% | 23% | 8% | 11% | 115 g |
| Tue 23 Sept | 760 GWh | 15% | 38% | 8% | 9% | 174 g |
| Wed 24 Sept | 758 GWh | 21% | 31% | 8% | 8% | 151 g |
| Thu 25 Sept | 748 GWh | 28% | 22% | 8% | 11% | 113 g |
| Fri 26 Sept | 751 GWh | 28% | 28% | 8% | 5% | 131 g |
| Sat 27 Sept | 730 GWh | 34% | 24% | 8% | 5% | 116 g |
| Sun 28 Sept | 695 GWh | 10% | 38% | 9% | 8% | 188 g |
| Mon 29 Sept | 764 GWh | 8% | 47% | 8% | 8% | 217 g |
| Tue 30 Sept | 785 GWh | 18% | 41% | 8% | 8% | 187 g |