My tree limb hit a neighbor's power line

[Joshua Feit]

Okay, so, you see where this is going...

Big storm today, and one of my tree branches (big!) came down into my neighbor's driveway. No damage (thank goodness!) other than a downed power line.

I am a landlord, but in this case, this is my primary residence, and the house next door is owned by a landlord. I am glad to help with whatever is my responsibility, but I just want to know legally who is on the hook for what.

Questions:

1) Who is responsible for the removal of the debris?

2) Who is responsible for the downed power line?

3) My landlord neighbor now wants me to take down 4-5 trees, so that this doesn't happen again. The trees are healthy, but I understand his nervousness. What is reasonable to say to this request?

Thank you for the help!