When you run current through a power line, besides the electric and magnetic fields which are localized around the paths of conduction, it also radiates EM fields that propagate through the ether.

Why does it do that though?

I know from radar design, the various power tubes shoot streams of electrons through a vacuum, which are then interacted with through various ingenious mechanisms; the 'braking force' of changing the velocity and or direction of the traveling electrons resulting in the emission of EM fields, converting it's kinetic energy to radiated power.

Is that what is going on when the current is conducted through something? Irregularities in the path material(s) causing perturbations in the electron stream, resulting in bremsstrahlung?