DM- depends on which electric company you are with. Often they ask you to dig the trench and lay the bedding- then they come with the cable and lay it from the boundary of your property ot the meter board location- leaving you to cover it over. Cost can differ- depending on the age of the plant they are taking your electicity off and also- has the pole outside your place got a transformer on it- i think they can only take a supply from a transformer pole- but i am not certain.
declan