Method note · measured
Negative hours and episodes
What it measures
How many hours the day-ahead price fell below zero in a bidding zone, and how long each run lasted.
Inputs
- The day-ahead price on the canonical hourly grid, for the bidding zone selected on the view
Method and weighting
A negative hour is any hour whose day-ahead price fell below zero. Quarter-hour prices are first averaged into their hour on the canonical hourly grid.
The count is grouped by local calendar day, giving a calendar of negative hours per day, and by local calendar month. A negative price is kept as it is, because a producer paying to keep generating is the fact this count exists to show.
An episode is a run of consecutive negative hours exactly one hour apart; a gap in the data or a single hour priced at or above zero ends the run.
Window
The rolling 12 months to the last complete day, refreshed on the 1st and 15th of each month; every zone shares the same window. The current window runs from to . Data last refreshed on .
Known limits
- A quarter-hour priced below zero inside an hour whose average sits at zero or above is invisible to this count, since the hourly grid decides what counts as a negative hour.
Used on
- Negative Prices in The Daily Rhythm
Sources: ENTSO-E. Each is described on the Data sources page.