You do not pay for a new connection.
My connection has been modernized free of charge; four single aluminum wires were changed to 4 copper twisted into the face
I paid for what was mine: a switchboard to the wall with the equipment (security) and angle with the hook for the carrying cable (although it did not belong to me, because it is in front of the switchgear, but a friend of electrician made it quicker to me).
Of course, the first approach in the "power plant" - I bear all the costs of materials and workmanship (I do not remember the exact amount, but over 3000 PLN without what I have to do on my own).
It was only the support of the law (power, ownership) that divided costs for my and the distributor respectively (the power remained the same, so I did not pay anything).
I will add that this is the third modernization in the history of this installation, for which the "power plant" did not even pay a zloty.
If your contract is in the same location and same name, only the structure and power are changed
- the costs depend on whether the official is a tsar, or a normal person who only has to help you, that you can have what you have planned and pay in the future for what you consume and for your wages (this is the execution power supply services, it is no favor of the tsar from behind the desk).
All you have to do is follow what's up to you according to the "art" or regulations in force (you can ask for it in the office).