Thus, if electricity is scarse and expensive across Europe, French wholesale prices rise as well.
FWIW, the French government forces EDF to sell the electricity to its national competitors at a fixed price of around 50 Euro/MWh, IIRC.
https://www.cleanenergywire.org/factsheets/germanys-energy-c...
A better way to quantify grid health would be to identify periods of peak demand across northwestern/central Europe, and then tally who is selling power to whom at those inflated prices.
I have solar panels on my home, as do most of the homes in my neighborhood. However, we recently had to have a natural gas substation built adjacent to the community to deal with the demand surges coinciding with supply disruptions (every time it snows).
Maybe my understanding of how it all works using your own solar panel and the neighborhood's gas lines is too simplistic, though, to answer.
The solar panels just feed power into the grid. This is the standard model used all over the Western US.