[thyristan]

> It just means that the day-ahead market was cleared below 0

No, it doesn't. The article is explicitly about intraday-prices. So day-ahead clearance made invalid assumptions about generations and consumption that were not met during the day. This kind of miscalculation does require additional (costly) redispatch measures to mitigate the overproduction, and it can affect grid stability.

[Dagonfly]

You are right that intraday went even more negative than day-ahead. But I disagree about the rest of your comment. A spread between day-ahead and intraday does not imply additional redispatch. Only some of it might have been countertrading by the grid operators.

The redispatch was not extraordinary: https://energy-charts.info/charts/power_redispatch/chart.htm...