alt Hacker NewsStorage still has some way to go until comparing the raw price per MWh ceases to be a partially apples to oranges comparison. You can't really have a stable grid in most of Europe with only solar + wing + storage. Unless you are willing to close down most of the factories during winter amongst other things.
Add a bit of firming and you can. Or just accept a tiny bit of fossil fuels. Don't let perfect be the enemy of good enough.
We still need to decarbonize agriculture, chemicals, aviation, shipping, heavy industry, construction and so on. Most of which use either chemical energy carriers, or fossil feedstock.
Siphoning off a tiny bit off that for grid firming duty is trivial. Or do sustainable biofuels from food waste and so on.
Which is also what the system studies lands on. Finding that adding new nuclear makes it far more expensive.