My client sold a portion of their farm with a barn on it.

The sold barn has electricity that is run underground to a larger barn with the meter that is still my clients.

In a perfect world I would think disconnecting the power and pulling the underground wire would be the way to go but I do not know if it would be an option at this time.

If I do not pull the wire from the underground conduit, is there a specific codes compliant method to disconnecting the service and leaving the wire in place?

I would be concerned about just leaving the bare wires hanging loose outside of the box or inside the box even though there is no meter or service at the other end.

PS that is an old picture. Wasps have been removed and the conduits connected to the box correctly at this time.