Why does it have to have anything to do with Lorenz? (I assume you are considering the power lines themselves buzzing in free air)FWIW: Someone did the math, already:
Is this more plausible than the catfish?
Consider the magnetic field caused by 4000A (or 1000A if you like) in proximity to any ferro magnetic hardware of the pylon, or from resultant induced currents in such hardware. This is how induction motors move after all. I'd say that is somewhat more plausible than the catfish.
Oh - and any vibration so caused could also travel accoustically down the power line itself
I'll admit to not having done any maths
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