We need localized generation as we are way too dependent on imported power. Transmission to distribution transformers for substations and generation facilities are often built to order, take months to deliver and are very expensive, so spare transformers aren't much kept in stock. SF6 gas and oil filled circuit breakers are similarly vulnerable. Cameras and alarms don't frighten terrorists and other saboteurs. Some might talk about armed guards, but pistols aren't much of a deterrant to RPGs and bullets flying around a substation firefight can be catastrophic to equipment. Take out a very few 500kv substations and southern california goes in the dark. No electricty to pump water, pump gasoline and diesel, refrigerate food, power medical facilities and home devices and so on. Circuit switching is increasingly remote controlled, either radio controlled (like a garage door opener) or often is conducted unisolated from the internet. Both are subject to intrusion and hacking. The atlantic and pacific oceans used to protect us from such shenanigans, but no longer. Rooftop solar is designed to work only if the utility is energized, this is to prevent dangerous backfeed to the circuit but also isolates the house from solar generation.
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