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Not sure how much I am allowed to go into detail here, but can confirm what 127361 wrote: the sensors harvest power from the electromagnetic field in normal use. However, considering "power outage detection" is a selling point, you can draw your own conclusions about there being some power storage onboard ;)

power harvest and large/super caps? neat

I think the first assumption should be a boring old battery. Probably some lead acid type, since discharge would be very very rare.

probably patented by now? disclosed yet?

Likely from the magnetic field from the conductor. They even have street lights that are powered this way.

https://livrepository.liverpool.ac.uk/3005516/1/TPEL2436702%...

https://www.youtube.com/watch?v=KqbIhZO7SJc

A few years ago I was thinking of how to use powerlines to recharge drones using the electromagnetic field. Imagine a drone hanging from a line like a bat, recharging in remote areas.

I think MIT had a patent for that. This could be the perfect use case for that too..?