Actually thats not true.
Yes the high wind part is true but your theory of touching power lines is not true at all. The fires in the foothills were due to high winds and camp fires. The fires near the napa and sonoma were by PGE power lines that fell and touched the ground due to high winds. Yes, I have inside information. PGE is already accepting demand packages for those.
Yes downed power lines are implicated in at least some of these fires but before we can say we know how they all started, I think we should wait for the official word, which is probably days if not weeks off. More to the point, what I think people who aren't from this part of the country fail to appreciate is the intense heat, dryness and ferocity of these offshore winds, and the tinder-dry conditions of our hillsides in the late summer and early fall when they occur. Almost any spark can set off brushfires and under these conditions they can develop into massive firestorms in a matter of minutes.