Spain's blackout: Cyber or Not? An unbiased technical analysis

Introduction Yesterday afternoon, I was writing what should have been the regular newsletter when the power suddenly went out. I wasn’t alarmed at all because I live in a mountain area, and power outages like this happen several times a year. It was a slightly windy day, so I assumed that maybe a tree had cracked and hit a low-voltage line or something similar. But, as it turns out, that wasn't…