ELI5 Power Lines - why aren't more of them underground in the US?

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 To the ELI5 community that has supported us so far, thanks for all your feedback and comments. Send us an e-mail: [email protected]