[nomel]

I can't find any information on how these are powered. Do they partly use current flow from coronal discharge? Or is it some long lasting battery?

[xnzakg]

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 ;)

[bozhark]

power harvest and large/super caps? neat

[nomel]

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

[mistrial9]

probably patented by now? disclosed yet?

[127361]

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

[Paddywack]

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..?