That's the funny thing about you utility guys, you all have your own rules.
Here if I relocate he overhead the POCO will charge for the move, after all they move the wires they own.
If I go underground the customer will have to provide ditch, pipe, wire and labor to about 15' up the pole. Almost no charge from the POCO.
Just wish the POCO would use the POCO specified grounding clamp that I put on the metal risers.