Something that might not be obvious: the shape of feeders can change based on switching operations. New PV on the big expensive house next to open space can cre

Something that might not be obvious: the shape of feeders can change based on switching operations. New PV on the big expensive house next to open space can create problems (you now have a generator right at the end of the grid) and new EVs can be roughly as much demand as a new house. Sometimes the fix is to change what feeds what, especially in a dense city. The utility obviously knows what feeder every meter is on but may not have anticipated (or paid for!) bulk calling the exact customers based on that. CA had rolling outages (caused by Enron) and implemented a system for notification but it was work, took years to design and put in place. The systems for managing switching and restoring power are quick/live/critical whereas the systems for building / maintaining are more slow / archival / non-critical. Both are typically legacy systems mired in an interconnected web with other legacy systems and very, very slow to change. Anything that looks like a bulk customer / phone list api is even slower.