UK electricity in December 2025
Day by day: how Great Britain made its electricity in December 2025.
In December 2025, wind made 38% of Britain's electricity, then gas (25%). Renewables made 48%, against 47% a year earlier; average carbon intensity 122 g/kWh.
Electricity generated each day, December 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
December 2025 in total
| Source | Electricity | Share |
|---|---|---|
| Wind | 10.3 TWh | 37.8% |
| Gas | 6,804 GWh | 25.0% |
| Imports | 4,038 GWh | 14.8% |
| Nuclear | 2,754 GWh | 10.1% |
| Biomass | 1,829 GWh | 6.7% |
| Hydro | 510 GWh | 1.9% |
| Other | 432 GWh | 1.6% |
| Solar | 415 GWh | 1.5% |
| Pumped storage | 159 GWh | 0.6% |
| Renewable (wind, solar, hydro, biomass) | 47.9% | |
| Low carbon (renewable plus nuclear) | 58.0% |
Standout days
- Windiest day509.4 GWh of windWed, 10 December 2025
- Highest wind share56.5%Sun, 14 December 2025
- Sunniest day28.1 GWh of solarWed, 3 December 2025
- Cleanest day62 g/kWh averageSun, 14 December 2025
- Dirtiest day200 g/kWh averageTue, 16 December 2025
Every day
| Day | Total | Wind | Gas | Nuclear | Solar | Carbon |
|---|---|---|---|---|---|---|
| Mon 1 Dec | 944 GWh | 42% | 22% | 11% | 0% | 109 g |
| Tue 2 Dec | 939 GWh | 35% | 30% | 11% | 3% | 134 g |
| Wed 3 Dec | 963 GWh | 27% | 40% | 10% | 3% | 173 g |
| Thu 4 Dec | 979 GWh | 36% | 32% | 10% | 1% | 144 g |
| Fri 5 Dec | 999 GWh | 39% | 32% | 9% | 1% | 144 g |
| Sat 6 Dec | 845 GWh | 45% | 14% | 10% | 1% | 79 g |
| Sun 7 Dec | 819 GWh | 41% | 16% | 10% | 0% | 98 g |
| Mon 8 Dec | 883 GWh | 47% | 13% | 10% | 1% | 86 g |
| Tue 9 Dec | 919 GWh | 54% | 13% | 9% | 0% | 70 g |
| Wed 10 Dec | 938 GWh | 54% | 14% | 9% | 2% | 69 g |
| Thu 11 Dec | 956 GWh | 45% | 22% | 9% | 2% | 103 g |
| Fri 12 Dec | 903 GWh | 27% | 39% | 10% | 1% | 169 g |
| Sat 13 Dec | 851 GWh | 41% | 21% | 10% | 3% | 100 g |
| Sun 14 Dec | 862 GWh | 56% | 13% | 10% | 2% | 62 g |
| Mon 15 Dec | 909 GWh | 33% | 31% | 10% | 1% | 135 g |
| Tue 16 Dec | 915 GWh | 19% | 46% | 9% | 1% | 200 g |
| Wed 17 Dec | 982 GWh | 41% | 31% | 9% | 0% | 140 g |
| Thu 18 Dec | 914 GWh | 47% | 16% | 9% | 0% | 86 g |
| Fri 19 Dec | 905 GWh | 46% | 21% | 10% | 3% | 101 g |
| Sat 20 Dec | 829 GWh | 33% | 27% | 10% | 2% | 124 g |
| Sun 21 Dec | 819 GWh | 33% | 25% | 10% | 1% | 129 g |
| Mon 22 Dec | 862 GWh | 33% | 27% | 10% | 1% | 130 g |
| Tue 23 Dec | 856 GWh | 37% | 22% | 10% | 0% | 125 g |
| Wed 24 Dec | 821 GWh | 40% | 16% | 10% | 2% | 97 g |
| Thu 25 Dec | 766 GWh | 47% | 12% | 12% | 4% | 90 g |
| Fri 26 Dec | 752 GWh | 34% | 23% | 12% | 3% | 120 g |
| Sat 27 Dec | 789 GWh | 38% | 18% | 11% | 2% | 109 g |
| Sun 28 Dec | 774 GWh | 16% | 37% | 12% | 1% | 192 g |
| Mon 29 Dec | 827 GWh | 21% | 38% | 11% | 1% | 190 g |
| Tue 30 Dec | 838 GWh | 23% | 33% | 11% | 2% | 170 g |
| Wed 31 Dec | 875 GWh | 38% | 22% | 11% | 3% | 119 g |