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Indeed, they will just black out together with everything else. They are generally not on separate distribution circuits. They do have some limited backup power though.

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The ones I was helping deploy usually had generators as backup because the requirements from the government was that emergency call infrastructure works when power goes out.

I can see smaller network operators save money on backups, but major monopolies usually don't have a choice in this manner.

So I wonder which regions don't do that?

As far as I know the Netherlands doesn't. But I don't work in that industry.

For how long can these generators run?

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