There at least two kinds of power lines. Those with very high voltage from the generating source switch yard to the substation with large distribution transformers, and those lines with stepped down voltage from the distribution transformers to the users.
The former are transmission lines. The latter are distribution lines.
I don't think there are any transmission lines underground. The underground lines are distributuin lines.
Further, because they can cause severe electrical shock, transmission lines are carried between elevated towers that high enough to not be affected by a blowing tree limb.
The Power company problem are the distribution lines that are routinely supported by the common 35 foot pole. These distribution lines are subject to being knocked down and to parting in high winds.
Thansmission Lines
Distribution Lines
And just for the record in the interest of combatting ignorance
