Ya have to keep the lines and the land clear of things that burn.
It’s incredibly complex, almost impossible to understand.
I’m aware...
I work for the Kentucky equivalent of PG&E. We take this stuff pretty seriously. However, due to the climate here, the risk of fire is beyond remote. But still, we clear. In fact, they sprayed foliage killer on my hill (without my permission( where the line goes up from the road to my property on the hill.
But here, it’s more about branches causing outages, rather than fires.
If you supply electricity in an environment where the sort of stuff happening in california is a serious risk, you either change the way you do it - i.e. underground - or you accept the risk - i.e. what we do every day when we get in our cars.