Enough for a long cold winter night in northern Europe?
Enough for a longer https://en.wikipedia.org/wiki/Dunkelflaute ?
From your link:
"Events that last more than two days over most of Europe happen about once every five years."
I belive that for the EU as a whole, enough for two days works out as about 32 kWh per person. More or less for specific nations.
So, think in terms of what you'd repurpose used EV batteries for prior to fully recycling them.
Enough for a long cold winter night in northern Europe?
Enough for a longer https://en.wikipedia.org/wiki/Dunkelflaute ?