alt Hacker NewsPretty much no aspect of this event was "extremely rare". PG&E spends the whole year smoking $100 bills and laughing their assess off, then as soon as it rains even a little bit their junk explodes and they pretend they could not have foreseen water existing on Earth. This is not even the first, or second time that this specific substation has burned in living memory. It already burned in 1996 and 2003.
I'm not going to have a semantic argument with you, but I'd consider anything rarer than "a few hours per year" as an "extremely rare event" for the purposes of training autonomous vehicles.