I don't have to live there to tell you they do. Generators are very common in the US, though they are generally placed in locations where they are easy to ignore. I expect every hospital has them, as will your water department, natural gas utility, cell phone towers (hit and miss, many don't have them, many do), any business with a data center on site (the generator might not cover the rest of the building, but the data center and HVAC will be on it).

In many locations your utility will give a substantial discount to power if you have a backup generator and will allow your utility to switch you to running only on the generator when power demand is high. It that is the case nearly every business will have a generator - it is almost paid for off the discounts and so the ability to run normally when the power is out makes it worth it.

In Mississippi I saw generators on 20 foot poles so they would keep operating even when a hurricane flooded the whole region (they probably went in after the hurricane where it would have been needed...). I wouldn't expect that in the Bay area, but it it shows what is considered normal in places that have earned a reputation as backward.

I know Chile is not the richest country, but my impression is they are good enough that I'd expect generators in all the important places at least. Though still power off will turn the city dark overall.

Yes, backup generators are required by the NEC for hospitals and certain other facilities (I’m at lunch and don’t have my copy of the NEC handy).

Generators are extremely common at hospitals, emergency dispatch centers, cell phone towers, nursing homes, natural gas and water pump stations, police and fire stations, data centers, etc.