A similar thing happened last June, with Albania, Bosnia, Montenegro, and most of the Croatian coastline losing power simultaneously.

Definitely felt surreal to first lose power to the degree that even traffic lights were no longer working, and then to hear it's also happening across the region just before mobile networks also went offline.

https://www.reuters.com/world/europe/power-blackout-hits-mon...

~90 page report: https://eepublicdownloads.blob.core.windows.net/public-cdn-c... (beware: PDF)

It shows that even when the original issues are solved the reboot takes time due to power station being spooled down due to excessive production. I hope it is all back before telecoms start draining the batteries, otherwise things get uglier