To bury a power line is very expensive. Do you mean not just the 220 split phase drops but not the 2500 volt feeder? To bury a high voltage lines is a big expensive because of the need to use materials that have both insulation and can resist harsh chemical reactions that could be in some soils.
Under such conditions, laying a fiber cable or a quality copper cable is easy by comparison. Burial is preferred for fiber and is one of the factors impeding its deployment.
When planning a new neighbor hood, a civil engineer would consider an underground conduct that would carry both storm drain water and provide a secure channel for high voltage and fiber optic lines. and telephone cables. If people still want copper wire telephones. Which might be needed for civil defense. The cooper is easier to repair in a crisis.
My earlier comments about power poles were meant for areas that are sparsely populated but do have electricity. A village of 500 people 100 kilometers of dirt road from a sizable town. Such areas may not have telephone service. No joke. It is true. They don't have indoor plumbing either. But they have lights and radios. No TVs. With new technology it is now more likely thy will get Internet before that get toilets. Or telephones or TVs.
