ELI5 Powerlines - why aren’t more power lines underground in the US?

ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast

Why aren't power lines in the US buried underground so that everyone doesn't lose power during hurricanes, wildfires and other natural disasters? What causes the audible electric 'buzzing' sound from overhead high voltage power lines? Why does Mozambique have some unique regulations for overhead powerlines?

... we explain like I'm five

Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: asanf, nebonit, stu_dying24, spectacularocelot and blade740

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