What drives electricity prices in Norway Trondheim?

NO3 is a hydro-dominated zone (76.2% of recent generation). Prices here move on water: reservoir filling levels set the opportunity cost of every MWh, so weekly hydrology matters more than daily weather. Dry spells lift the whole price level for months; wet ones sink it. Day-to-day volatility is usually low — until a regime shift arrives, at which point prices can re-level in days (as the July 2026 Nordic jump showed). Interconnector flows to thermal neighbours set the ceiling and floor.

The zone has cleared negative 2 hours so far this year (live counters on the tracker), inside a year-to-date range of -0.53 to 364.24 €/MWh. Our serving model (volt-3n) currently runs 9.5% less error than the naive baseline (backtest, 29 scored days) — verified daily on the public scorecard.