Monthly market report
Great Britain GB — September 2025
Day-ahead auction, 1,440 settlement periods, computed from the same data the API serves.
Average price
65.35 €/MWh
-6.02 vs previous month
Negative prices
51.5 hours
103 settlement periods below 0
Avg daily spread
84.24 €/MWh
the arbitrage opportunity, day by day
Volatility (σ)
36.99 €/MWh
Extremes
- Cheapest period
- -99.01 €/MWh Sep 6, 12:30 UTC
- Priciest period
- 249.5 €/MWh Sep 8, 17:30 UTC
Top spike days
- 2025-09-08max 249.5 €/MWh
- 2025-09-29max 131.23 €/MWh
- 2025-09-23max 130.67 €/MWh
Work with this data
- → Full 15-minute history via API (2015 onwards)
- → Battery arbitrage backtest against this month's prices
- → Live forecast accuracy for GB
- → Embed the live price chart on your site — free
Data source: ENTSO-E Transparency Platform (transparency.entsoe.eu). Data source: SMARD.de, Bundesnetzagentur | CC BY 4.0. Derived statistics are Voltcast own-IP output.