The last batch of fires were, AFAIK, caused by under-maintained PG&E infrastructure. I would not be surprised if it turns out these were, too.
PG&E does not operate in the Los Angeles area: https://www.pge.com/tariffs/assets/pdf/tariffbook/ELEC_MAPS_...
> Pacific Gas & Electric’s outdated equipment ignited wildfires in California that killed more than 100 people, wiped out entire towns and led the company to confess to crimes driven by its greed and neglect.
> The decision by U.S. Bankruptcy Judge Dennis Montali clears the way for PG&E to pay $25.5 billion for losses from devastating fires in 2017 and 2018.
I have a friend who does power pole inspection, and boy, the stories. Infra is crumbling.