I believe if the line is only serving the property it is on that the process is typically a little different then it is for getting proper easement for a line that "feeds through" a property, whether it serves anything on that property or not.
Basically if you are the only customer served by the line in question, any easement is covered in your terms of service agreement. If it serves other customers as well, especially if they are on different property, you need to get easement information noted on legal descriptions of that property, may or may not involve using attorney's and the court systems in some instances.
I think many places have simpler process of utility easements within so many feet of property boundaries, and some even have a right of way along streets or alleys that land owners don't have much say over if a utility company wants to place something in that ROW, even though the land owner may maintain some of that area.