In February 2022, Britain's electricity averaged 127 gCO₂/kWh, in the low band (70–139 g). That is 31% cleaner than January 2022 (185 g), and 29% cleaner than February 2021 (179 g). Wind made 41.9% of the electricity generated, gas 20.8%, nuclear 14.8% and imports 9.6%; low-carbon sources together made 67.0%. The cleanest half hour was 42 g at 11:00 on Sunday 27 February, and the dirtiest 263 g at 07:30 on Friday 11 February. The cleanest day was Sunday 27 February (76 g on average); the windiest was Saturday 12 February (52.7% wind).
Carbon intensity, day by day
Day by day, as a table
| Day | gCO₂/kWh | Low-carbon | Wind | Solar | Gas | Half hours |
|---|---|---|---|---|---|---|
| Tue 1 Feb | 114 | 70.8% | 49.4% | 1.8% | 20.1% | 48 |
| Wed 2 Feb | 171 | 57.5% | 33.5% | 1.3% | 32.4% | 48 |
| Thu 3 Feb | 151 | 64.0% | 39.8% | 0.9% | 28.2% | 48 |
| Fri 4 Feb | 114 | 70.7% | 45.3% | 2.0% | 19.0% | 48 |
| Sat 5 Feb | 82 | 75.1% | 51.0% | 1.5% | 12.4% | 48 |
| Sun 6 Feb | 80 | 76.5% | 52.3% | 1.4% | 10.5% | 48 |
| Mon 7 Feb | 152 | 63.0% | 37.4% | 1.5% | 26.1% | 48 |
| Tue 8 Feb | 126 | 68.5% | 44.0% | 1.0% | 21.0% | 48 |
| Wed 9 Feb | 143 | 64.8% | 37.1% | 1.6% | 25.6% | 48 |
| Thu 10 Feb | 162 | 63.0% | 36.7% | 1.9% | 26.1% | 48 |
| Fri 11 Feb | 211 | 50.1% | 24.2% | 2.4% | 37.2% | 48 |
| Sat 12 Feb | 90 | 73.6% | 52.7% | 1.6% | 15.5% | 48 |
| Sun 13 Feb | 120 | 64.9% | 41.3% | 0.4% | 21.0% | 48 |
| Mon 14 Feb | 153 | 60.6% | 36.7% | 1.5% | 22.2% | 48 |
| Tue 15 Feb | 152 | 62.1% | 39.2% | 0.7% | 24.1% | 48 |
| Wed 16 Feb | 91 | 71.1% | 47.6% | 1.1% | 15.5% | 48 |
| Thu 17 Feb | 92 | 72.2% | 46.2% | 2.5% | 16.7% | 48 |
| Fri 18 Feb | 109 | 66.8% | 40.5% | 1.6% | 20.1% | 48 |
| Sat 19 Feb | 130 | 62.1% | 37.7% | 1.3% | 23.1% | 48 |
| Sun 20 Feb | 91 | 75.0% | 52.5% | 0.5% | 12.3% | 48 |
| Mon 21 Feb | 136 | 65.0% | 40.9% | 2.1% | 21.5% | 48 |
| Tue 22 Feb | 122 | 68.1% | 42.3% | 2.2% | 19.0% | 48 |
| Wed 23 Feb | 127 | 70.4% | 44.6% | 1.9% | 17.0% | 48 |
| Thu 24 Feb | 115 | 71.4% | 45.2% | 2.7% | 13.0% | 48 |
| Fri 25 Feb | 163 | 60.0% | 32.2% | 3.8% | 26.3% | 48 |
| Sat 26 Feb | 113 | 69.0% | 40.6% | 4.4% | 18.8% | 48 |
| Sun 27 Feb | 76 | 77.2% | 47.9% | 5.2% | 11.0% | 48 |
| Mon 28 Feb | 157 | 62.5% | 35.3% | 1.1% | 27.2% | 48 |
What powered the grid
Each fuel's average share of the electricity generated in Great Britain in February 2022, with February 2021 beneath it for comparison. Imports count as one source, as NESO counts them.
Hours in each carbon band
- Very low (under 70 g): 91 hours, 14%
- Low (70–139 g): 318 hours, 47%
- Moderate (140–219 g): 239 hours, 35%
- High (220–299 g): 25 hours, 4%
Records in February 2022
- Cleanest half hour
- 42 g 11:00 on Sunday 27 February
- Dirtiest half hour
- 263 g 07:30 on Friday 11 February
- Most wind
- 65.6% 03:30 on Thursday 17 February
- Most solar
- 20.0% 12:00 on Sunday 27 February
- Most low-carbon
- 89.5% 03:30 on Thursday 17 February
- Least gas
- 4.8% 12:00 on Sunday 27 February
- Cleanest day
- 76 g Sunday 27 February
- Dirtiest day
- 211 g Friday 11 February
- Windiest day
- 52.7% wind Saturday 12 February
- Sunniest day
- 5.2% solar Sunday 27 February
About these figures
GridMonkey records NESO's carbon intensity and generation mix for Great Britain every half hour: the actual figure where NESO has published one, otherwise its forecast. They are added up by UK calendar day and month. Percentages are shares of the electricity generated, imports included, so the fuels add up to 100%. Low-carbon means wind, solar, nuclear, biomass and hydro. The carbon bands are GridMonkey's: very low under 70 g, low 70–139 g, moderate 140–219 g, high 220–299 g and very high 300 g or more, per kWh. Northern Ireland has its own grid and isn't included.
To see the grid now, open GridMonkey. For the wind farms that ran hardest this week, see the wind farm league table.
Data: NESO Carbon Intensity API (carbonintensity.org.uk), licensed under CC BY 4.0, recorded and summarised by GridMonkey. Figures as of 26 October 2026.