The primary need for a powerline inspections is to oversee the safe building and maintenance of electric power lines, distribution, and transmission across the country.
Trees or artificial structures built close to the powerlines can also threaten human life. In addition, without frequent powerline inspections and or maintenance of the powerline infrastructure, the maintenance workers and the public are at the risk of electrocution.

Source - https://fielda.com/apps/electric/powerline-inspections-checklist/