Monthly market report
Spain ES — September 2025
Day-ahead auction, 726 settlement periods, computed from the same data the API serves.
Average price
61.62 €/MWh
-6.63 vs previous month
Negative prices
32 hours
32 settlement periods below 0
Avg daily spread
121.3 €/MWh
the arbitrage opportunity, day by day
Volatility (σ)
42.89 €/MWh
Extremes
- Cheapest period
- -0.99 €/MWh Sep 6, 12:00 UTC
- Priciest period
- 215 €/MWh Sep 17, 19:00 UTC
Top spike days
- 2025-09-17max 215 €/MWh
- 2025-09-18max 200 €/MWh
- 2025-09-30max 199.34 €/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 ES
- → 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.