The week on the grid
Each finished week in one place: how clean electricity was, what it traded for and how much renewable output was turned down.
From 14 September to 20 September 2026, renewables averaged 63% of electricity, carbon intensity averaged 87 gCO₂/kWh and wholesale prices went negative for 33 half hours. Generators were paid £23.7 million to switch off 535,020 MWh of renewable output. Figures as compiled at 08:30 GMT on 6 November 2026.
14 September to 20 September 2026
Renewable share
63%
17% higher than the week before
67% low carbon, including nuclear
Average carbon intensity
87gCO₂/kWh
20% lower than the week before
Lowest 34 at 12:00 on 15 Sep
Average wholesale price
10.54p/kWh
29% lower than the week before
Peaked at 21.83p at 19:00 on 14 Sep
Negative-price half hours
33
Lowest price -1.90p at 16:00 on 20 Sep
Renewables turned down
535,020MWh
38% higher than the week before
£23.7 million paid to switch off
Average generation mix
Each source's share, averaged across the week's half hours. Includes embedded solar and wind.
| Source | Average share |
|---|---|
| Wind | 47.6% |
| Gas | 17.4% |
| Nuclear | 10.9% |
| Biomass | 7.0% |
| Solar | 6.6% |
| Imports | 6.4% |
| Other | 2.4% |
| Hydro | 1.8% |
Other weeks
| Week | Renewable | Avg gCO₂/kWh | Negative-price half hours |
|---|---|---|---|
| 26 October to 1 November 2026 | 43% | 149 | 0 |
| 19 October to 25 October 2026 | 54% | 100 | 7 |
| 12 October to 18 October 2026 | 55% | 98 | 0 |
| 5 October to 11 October 2026 | 53% | 109 | 0 |
| 28 September to 4 October 2026 | 49% | 132 | 0 |
| 21 September to 27 September 2026 | 46% | 136 | 3 |
| 14 September to 20 September 2026 | 63% | 87 | 33 |
| 7 September to 13 September 2026 | 54% | 109 | 8 |
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