Monthly market report
Ireland (SEM) IE-SEM — September 2025
Day-ahead auction, 720 settlement periods, computed from the same data the API serves.
Average price
94.54 €/MWh
-1.77 vs previous month
Negative prices
12 hours
12 settlement periods below 0
Avg daily spread
117.75 €/MWh
the arbitrage opportunity, day by day
Volatility (σ)
46.16 €/MWh
Extremes
- Cheapest period
- -3.19 €/MWh Sep 15, 02:00 UTC
- Priciest period
- 232.89 €/MWh Sep 1, 20:00 UTC
Top spike days
- 2025-09-01max 232.89 €/MWh
- 2025-09-02max 225 €/MWh
- 2025-09-22max 215 €/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 IE-SEM
- → 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.