They have backup power which can get them through any expected power outage. They don't have unlimited backup power that would be able to get them through a "apocalypse" or major terrorism scenario where the world is ending and power will be out for more than a week. Preparing to survive an apocalypse or major terrorism incident is possible. Build all facilities a mile underground with a self enclosed ecosystem. Might cost trillions, but can be done.

PG&E has intentionally deployed, at short and inadequate notice, what is equivalent to a terrorist attack on west coast infrastructure. No one prepared for or expected that scenario. Past events have shown that PG&E management are sociopaths who intentionally engaged in mass criminal negligence which resulted in dozens of deaths and billions of dollars of property damage. Even under the oversight of a captured court, they continue with their games.

If there is any sanity left in California, the USDOJ would bring the executives who deployed this plan and the judge who signed off on it under terrorism charges. If any deaths occur as a result of these antics, it should be capital charges.