Never a good thing to remove an established tree but on aoccasion it is necessary. I unfortunately get to deal with the PR side of this too often. 99.9% of the time it boils down to which was there first, the power line or the tree. I do not wish to imply that this is the case here but, all to often I see homeowners and businesses plant young trees too close to power lines, phone lines, fences, buildings, and even other trees. When trees are one inch in diameter and four feet tall most never think of the consequences of it being 30 plus feet tall and several feet in diameter. Something you may look into is tree replacement. My city requires me to replant two trees for every tree I remove regardeless of the reason for removal. Locations of the new trees have to be agreed to by the homeowner and don't necessarily have to be on there property, can be at a church, school, or other property as long as it is within city limits.