The premise of this question is that we know how often a power outage in Nebraska was caused by a power outage in New York. We don't know, and the conclusion sh

The premise of this question is that we know how often a power outage in Nebraska was caused by a power outage in New York. We don't know, and the conclusion should not be that it is not that often, but that we do not know. If anything is vulnerable to cascading, domino, effects, it is electric grids: interconnected networks, even at an intercontinental level.