Hi Ruth, There are devices that can be installed by the utility company on poles and lines to keep animals off. This is a solution that would need to be implemented by the utility.
No one except the utility company should ever go near utility equipment. And no one other than a trained lineman who works for the utility company should attempt to install animal guards on utility equipment.
You can see what they look like here:
http://www.critterguard.org/index.php?/Safety-Critters-Awire.html
Let me know if you have more questions, Laura