OptionProbability
Never found root cause
Loss of synchronism
Cascading failure (like something went wrong and the recovery procedure had an issue that made it worse)
Strain on electrical/transmission infrastructure principally caused by renewable energy sources
Renewables made the grid less stable
Low or insufficient inertia
Battery storage
The cause didn't originate in Spain (was propagated by EU grid)
Bad weather
Intended infrastructure damage (cable cut, bomb, etc)
It's declared a cyber attack
Cyber attack & Russia-funded
Accidental infrastructure damage (fallen tower, wildlife, etc)
Cyber attack & independent group
"Intern plugged wrong cable"
Cyber attack & USA-funded
80
20
19
8
6
5
4
3
2
1
