Typically there is no way to move items placed by the utility companies. The developers plot out the lots for construction and provide easement rights allowing the utility companies to install electrical, gas, water, cable, etc that will be connected to all of the future homes. Always a good idea to walk a piece of land around the parameter before purchasing.
The builders typically will discuss these issues with you before you sign. If you were building before any of the utilities were put in (this is happening as the builders will use generators until the utility companies can catch up and install their equipment/polls) you might not have known where these items were going to be installed. However, you mentioned you could see the poles from the street. About every other home gets the transformer box. Same with the cable box. Power poles are typically on the edge of the neighborhood (sounds like your situation). Not much you can do once they are installed. You might be able to speak to Centerpoint in regards to the tension wire supporting the pole in the middle of your yard, maybe that could be moved to a different spot.
Have not heard of any safety issues regarding these items. It is typically not a pretty to look at. Most homeowners installed small fence or bushes around the items so you cannot see them and make it difficult for kids to get near. It should not effect you when it comes to selling the home.
Sorry not much good news from us. Good luck with your build.
Bernstein Realty, Inc.