Don’t dial 911. Don’t call your mom (though she’d love to hear from you). You need your local Distribution Network Operator (DNO)—the company that owns the poles and wires in your region. They are not your energy supplier (who bills you); they are the fixers.
In the UK, for example, that’s someone like UK Power Networks or Scottish Power Energy Networks. A quick Google search of “report power cut [your city]” will give you the direct line. Save that number in your phone now, before you need it in the dark with 3% battery.
Pro Tip: The 105 Service
Did you know that in many areas, you can report a power cut by simply dialing 105? Yes, three digits. It’s like 911, but for electricity. It works in most of the UK and is slowly rolling out in other regions. Memorize it. It’s the easiest win you’ll get all day.