I have tried to work with Duke about burying the lines on a few projects, but it's incredibly difficult to work with them and prohibitively expensive. The last time I tried to do this, I was quoted around $150,000 to burry a ~400' section of overhead line. And that was just Duke's price. It was another ~$200k from AT&T and another ~100k from Spectrum. We just didn't have it in the budget to spend more than $450k just to burry some overhead lines.
Even if we were doing the type of project that could cover this, Duke is very reluctant to do it. One of the reasons I have been told is that it's a safety issue. For the vast majority of Duke's utility poles, the electricity runs from the overhead line to the underground line (where you start to burry the line). It is a comparatively rare situation to have the electricity run from the underground line to the overhead line (where the buried line ends). If there is an issue with a line (storm debris mostly), then the linemen who are out there are very familiar with expecting the live side of the line to be coming from overhead going down the pole, but are not as familiar with the underground side going up the pole being the live side. There are many 'holes' in this excuse, but that is just what I've been told by Duke.