Monthly market report
Great Britain GB — December 2025
Day-ahead auction, 1,488 settlement periods, computed from the same data the API serves.
Average price
74.77 €/MWh
-1.09 vs previous month
Negative prices
0.5 hours
1 settlement periods below 0
Avg daily spread
50 €/MWh
the arbitrage opportunity, day by day
Volatility (σ)
17.85 €/MWh
Extremes
- Cheapest period
- -0.07 €/MWh Dec 18, 23:30 UTC
- Priciest period
- 122.77 €/MWh Dec 2, 16:00 UTC
Top spike days
- 2025-12-02max 122.77 €/MWh
- 2025-12-03max 115.6 €/MWh
- 2025-12-05max 111.08 €/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.