This doesn't appear to be tree related (probably), but - there's a lot of trees here. Like, a lot. When a storm blows through there's definitely a higher chance of an outage than you might have in the average city.

But besides that I've never really had too much of a problem. With the insane summer temps the last few years there are times when it gets dicey, but not many outages. Nothing like Columbus (Ohio) where they had to do intentional blackouts last year.