Is that 3-phase primaries under that tree, or just the secondaries?
If those are primaries, I believe I would make the utility company get the top out of that. It's clearly their obligation.
Around here, if a tree is only over the secondaries, they will put REAL insulation on the lines, and then tell you to have fun. All the while adding comments like:
...please don't tear the wires down!
...Call us if you knock down the wires!
We had a really nasty dead tree last fall, KCPL was going to take down all the pole-to-pole secondaries at the back of the lots before they were going to take the top out of the tree themselves. Fortunately, my cheapskate relative didn't want to pay me the $500 I quoted for climbing and dropping this behemoth. When he calls me again this summer, I'll politely decline, as it is too much dead for me to set foot in, and I can't ask someone else to do it either.
It was a 3' DBH shingle oak about 80' tall, leaning at about 20° off vertical, with no branches for 50'. Real easy work to do, providing it never failed during the climb. I'm a chicken in dead trees.