Theoretically a utility should be able to enforce it. Utilities do "Own" the land that the phase wires are on. There is a "Utility Easement", so they should have Eminent Domain(sp?). Instead of irreparably damaging these trees (I think we can all agree that trees are poorly pruned from time to time), they should hire our well trained Utility Foresters to properly and safely remove the affected trees and then hire our well trained Utility Foresters to replant appropriate spp., at the correct planting depth of course, with an exposed root flare. Win win?