But that's my point. It would cost 1 year's worth of German GDP in batteries to power Germany on batteries for 6 months. No one would ever need that much battery backup. And while it's a huge number, it's not an unfathomably huge number.
So, just jack up the debt from 60% of GDP to 160% for battery packs?
That's the absolute most that handling the absolute worst case could cost today. It can only get cheaper from here. And there's no need for government debt.