California residents - 600,000 to 800,000 of them - are experiencing planned blackouts as power officials hope to prevent more fires.

https://poweroutage.us/area/state/california

It will be informative to hear after action reports of how well residents coped with these well publicized outages. How, for example, will your 80 year old grandma get between her 10th floor condo and the ground floor without the elevator? Will the traffic signals and street lights work? Cash will be required when the credit cards and ATMs don't work.

Edited to add - I placed this in Large Scale Emergencies before I looked at Urban Preparedness.