This is for what utilities call "medium voltage" distribution (1KV to 35KV), not high tension towers. These are the cables you see around your neighborhood, upstream of the pole transformer. They're usually not insulated other than by airspace. Clearcutting around those would wipe out the trees in most residential areas.

The big high tension towers go through clear-cut rights of way.

The big headache is not burying cable. If there's nothing else in the ground, that's not too hard. It's working around water lines, sewer lines, gas lines, driveways, phone, data, cable TV...