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The KYOS Negative Prices Metric monitors the number and magnitude of negative price occurrences across European power day-ahead markets.

The occurrences are reported as the number of negative hours in three different windows:


  1. As the daily cumulative number of negative price events within a year. This means that the September 12th point in the 2023 curve reports all the number of negative price events between January 1st 2023 and September 12th 2023.
  2. As the total number of negative price events in the latest 12 months. For example, the April, 2024 index reports the number of negative price occurrences between May 1st 2023, and April 30th 2024.
  3. As the total number of negative prices events in a specific month of a specific year. For instance, the June 2022 point reports the number of negative price events from June 1st 2022, to June 30th 2022.

To provide an insight on the magnitude of the negative prices we also report the average negative price of these events in EUR/MWh for each of the three windows.


The data sources used for this metric are the day-ahead hourly historical price series from EPEX, Nordpool, OMIE, and other publicly available price data sources per market.