Kinda surprising to me, since i had some trouble with Cursor & Co. once the file went over ~800 lines. It repeatedly failed to edit it, until i split it up into multiple logical components. As it should have been from the beginning...
Though, it was some time ago, so things might have improved?
I'd say it's very unlikely that there will be no wind or sun all over Europe. There is constant exchange of excess energy between the countries anyway. Regardless of that, there are other options too. Like water or geothermal depending on the country. Sometimes there even will be too much energy. I can imagine this being used to make some hydrogen for later use.
Though, it was some time ago, so things might have improved?