As always, you can go and look at the electricity generation and see that e.g. coal in Germany was still generating when "solar" caused negative prices. https:

As always, you can go and look at the electricity generation and see that e.g. coal in Germany was still generating when "solar" caused negative prices. https://app.electricitymaps.com/zone/DE/72h/hourly https://app.electricitymaps.com/zone/DE/72h/hourly Wind and solar combined are barely above 50% for an hour in Poland https://app.electricitymaps.com/zone/PL/72h/hourly https://app.electricitymaps.com/zone/PL/72h/hourly