As an anectdotal data point, I live in Poland (Warsaw) and I can't remember the last time I had a power interruption at my home. I don't use UPSs at all, and my NAS gets years of uptime, unless I decide to reboot it.
This gets much worse if you live in the countryside, for obvious reasons, and I would guess that the German average is mostly driven by countryside, not big cities.
This gets much worse if you live in the countryside, for obvious reasons, and I would guess that the German average is mostly driven by countryside, not big cities.