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 28 September to 4 October 2026, renewables averaged 49% of electricity, carbon intensity averaged 132 gCO₂/kWh and wholesale prices never went negative. Generators were paid £20.8 million to switch off 566,388 MWh of renewable output. Figures as compiled at 08:30 GMT on 6 November 2026.
28 September to 4 October 2026
Renewable share
49%
8% higher than the week before
55% low carbon, including nuclear
Average carbon intensity
132gCO₂/kWh
3% lower than the week before
Lowest 54 at 11:00 on 4 Oct
Average wholesale price
14.49p/kWh
1% lower than the week before
Peaked at 26.78p at 18:30 on 28 Sep
Negative-price half hours
0
Lowest price 1.41p at 11:00 on 4 Oct
Renewables turned down
566,388MWh
72% higher than the week before
£20.8 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 | 32.8% |
| Gas | 27.5% |
| Nuclear | 13.2% |
| Biomass | 8.1% |
| Imports | 7.6% |
| Solar | 6.4% |
| Other | 2.3% |
| Hydro | 2.1% |
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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