Monthly market report
Norway Tromsø NO4 — September 2025
Day-ahead auction, 2,880 settlement periods, computed from the same data the API serves.
Average price
4.26 €/MWh
+2.14 vs previous month
Negative prices
3 hours
12 settlement periods below 0
Avg daily spread
4.58 €/MWh
the arbitrage opportunity, day by day
Volatility (σ)
2.27 €/MWh
Extremes
- Cheapest period
- -3.77 €/MWh Sep 11, 11:00 UTC
- Priciest period
- 12.73 €/MWh Sep 9, 19:00 UTC
Top spike days
- 2025-09-09max 12.73 €/MWh
- 2025-09-30max 11.93 €/MWh
- 2025-09-08max 11.9 €/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 NO4
- → 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.