In my hood, the lines are all behind the houses, along with an 8 inch gas main and a large sewer line. Burying lines would require access to the 20 foot wide easement, burying the power lines, placing transformers connected to the lines, then trenching every back yard, taking down the lines that run from the poles to the houses, and connecting the new buried drop to the meters. If the house has a pool or other structure between the easement and the meter, the work gets more complicated. And you have to hope all of the fences get put back like they were. We have 2 dogs, and one of them has been known to dash out an opening. So, is Centerpoint going to pay for boarding while the work is being done?
In the end our power costs would probably double. I don't see the benefit overall.