[rurban]

There was actually a Russian cyber attack on the previous friday, pinging some German city government sites to death. Dresden, Nuremberg and one other. But this was essentially kids play, compared to a nationwide power blackout. A cyber attack to bring down a nation's grid would be high sci-fi. This would need lots of explosives and expensive physical interventions. Russia didn't manage in Ukraine eg.

Solar flares or temperature anomalies are much easier explanations. https://en.meteorologiaenred.com/What-is-induced-atmospheric...