Comment by olex

300A of current is going through the wire, at high voltage - that's the transmission current. Drone is not charging directly from that, it lacks a ground / other phase connection to directly tap into the wire voltage (also, it lacks a... power substation and a bunch of other stuff to step down and convert the high-voltage AC from the line to low-voltage DC for the battery). Instead it uses an induction charger that "leeches" off of the magnetic field of the wire. If the wire current is higher, the magnetic field is stronger, so it can pull more power than the currently possible 50W.