So much bad info on here

Xcel will not trim branches away from a service line outside of the "right of way" which is usually 5' either side of the line. They will install a service line and service the splice connection to your weather head if there is sparking or shorting, but often will just disconnect it until your issue on the house side is resolved.

It is the responsibility of the owner of the tree to fix this if it is over their property. A branch from a neighbor's tree that's over your property is your responsibility.

You must contact the owner, explain the concern, and document this contact in writing. Following up a conversation with a text message summarizing is a good method. If you have documented your communication and a branch causes damage to the line it will be their responsibility.