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If the Pi has network (could be cable or WiFi in range if it's actually a Pi Zero W) then configure it as a web server, create a port forward on your router so the web server is publicly accessible, maybe on an odd port, and set UptimeRobot to monitor it - you will get an email when it goes away.
Also get the source of the tripping investigated before something terribad happens.
We have a freezer in an outbuilding plugged into a wall socket. Recently the power is being tripped to the building. When this happens there is no impact to my house or the home Internet. Sometimes it trips the fuse for the out building circuit in the house fuse box, sometimes in the fuse box for the outbuilding.
I want to be alerted when there is no power to the freezer. I don't want any sort of subscription plan.
What do I need?
Google seems to thow too many ads to be useful.
If it makes a difference I have a Google Home Mini and we have android phones. I don't have tonnes of free time, but I do have a spare raspberry pi zero if there is a simple solution there.