Monthly report · day-ahead marketElectricity prices in Great Britain, September 2026
In September 2026, electricity on the day-ahead market in Great Britain cost an average of 13.34p/kWh (£133.42/MWh).
That is 4% more than in August 2026 and 103% more than in September 2025.
The cheapest day was Saturday, 19 September 2026, averaging 2.67p/kWh; the most expensive was Tuesday, 22 September 2026 at 19.67p/kWh.
The lowest price came on 19 September 2026 at 13:00 (-0.18p/kWh), the highest on 22 September 2026 at 18:00 (35.50p/kWh). In total, prices were below zero for 23 hours.
On an average day, the cheapest three hours were 12:00–15:00. Weekends were on average 35% cheaper than weekdays.
Compared with
- Previous month (August 2026)
- 12.80 ▲
- Same month last year
- 6.58 ▲
- Weekdays
- 14.73
- Weekends
- 9.53
Wholesale price · p/kWh
Price by day
Daily wholesale average; the line marks the monthly average.
p/kWh
The average day
Average wholesale price for each hour of the day this month.
p/kWh · 12:00–15:00
All days
| Day | Average | Lowest | Highest | Hours < 0 |
|---|---|---|---|---|
| 1 Sept Tuesday | 13.08 | 5.70 13:00 | 18.89 19:00 | – |
| 2 Sept Wednesday | 15.29 | 12.90 15:00 | 20.00 18:00 | – |
| 3 Sept Thursday | 11.62 | 4.93 11:00 | 17.84 19:00 | – |
| 4 Sept Friday | 9.40 | 1.70 14:00 | 14.08 06:00 | – |
| 5 Sept Saturday | 6.90 | -0.13 10:00 | 17.56 20:00 | 5 |
| 6 Sept Sunday | 9.63 | 0.00 10:00 | 17.74 19:00 | 5 |
| 7 Sept Monday | 14.46 | 8.76 14:00 | 19.35 06:00 | – |
| 8 Sept Tuesday | 12.37 | 5.14 14:00 | 17.85 19:00 | – |
| 9 Sept Wednesday | 15.76 | 11.95 03:00 | 21.80 20:00 | – |
| 10 Sept Thursday | 15.86 | 11.59 13:00 | 19.38 06:00 | – |
| 11 Sept Friday | 17.23 | 14.40 03:00 | 24.74 19:00 | – |
| 12 Sept Saturday | 11.51 | 0.13 12:00 | 18.22 19:00 | – |
| 13 Sept Sunday | 17.43 | 15.36 05:00 | 20.49 17:00 | – |
| 14 Sept Monday | 17.50 | 14.25 13:00 | 21.16 07:00 | – |
| 15 Sept Tuesday | 16.83 | 12.98 11:00 | 21.87 19:00 | – |
| 16 Sept Wednesday | 16.88 | 14.46 01:00 | 22.42 18:00 | – |
| 17 Sept Thursday | 11.23 | 1.72 12:00 | 17.81 19:00 | – |
| 18 Sept Friday | 10.19 | 2.69 12:00 | 16.38 07:00 | – |
| 19 Sept Saturday | 2.67 | -0.18 13:00 | 9.78 19:00 | 10 |
| 20 Sept Sunday | 5.25 | 0.00 11:00 | 19.26 19:00 | 3 |
| 21 Sept Monday | 16.74 | 13.45 16:00 | 21.43 19:00 | – |
| 22 Sept Tuesday | 19.67 | 14.74 11:00 | 35.50 18:00 | – |
| 23 Sept Wednesday | 15.71 | 12.28 14:00 | 20.16 07:00 | – |
| 24 Sept Thursday | 14.80 | 10.40 15:00 | 18.88 18:00 | – |
| 25 Sept Friday | 15.89 | 13.51 11:00 | 21.81 18:00 | – |
| 26 Sept Saturday | 12.77 | 3.21 12:00 | 18.74 18:00 | – |
| 27 Sept Sunday | 10.13 | 0.40 10:00 | 17.18 18:00 | – |
| 28 Sept Monday | 17.13 | 11.96 12:00 | 26.72 18:00 | – |
| 29 Sept Tuesday | 14.24 | 7.53 13:00 | 18.70 18:00 | – |
| 30 Sept Wednesday | 12.10 | 6.39 04:00 | 18.76 19:00 | – |
p/kWh · Today · Methodology