Day-ahead electricity price — what it means and how it works
In depth
The European day-ahead market works like a sealed-bid auction. Each weekday at midday CEST, all power producers and large consumers submit hourly bids for the next 24 hours. The market operator (EPEX SPOT, Nord Pool, OMIE, etc. depending on the zone) clears them, finds the equilibrium price for each hour, and publishes the result by midday CEST.
The 24 hourly clearing prices are then locked in — the price you see for "tomorrow 14:00" is what every grid customer will pay (before retail margins, taxes and grid fees) for that hour.
Day-ahead prices vary dramatically intraday: solar oversupply often drives midday prices below zero in spring, while winter peak hours can reach €500/MWh+ during cold spells with low wind.