From what I understand, this situation has already been handled.
However, a few comments:
My Mom worked for The Bell System/Nynex/Verizon/whatever they call themselves now for 22 years, she did the billing for damaged property, ie poles, terminal blocks, drop wires etc. In New York, they can tear you apart if you damage their property, and people regularly were charged $3,000+ for one pole. I had a buddy trash a pole with his SS monte carlo, and Momma-San burried the paperwork... that was cool.
Also, Homeowner's Insurance will typically not cover an existing/known hazard. That falls on the HO. Only in the event that the tree falls and does damage will the claim (hopefully) be covered, but not if it is a pre-existing conditon- atleast this has been my experience in NY.
If the tree is on your property, legally it is your responsibilty, and you are required to take steps to mitigate that liability. You are also responsible should any property damage or injury/loss of life take place in regards to that tree, as it is legally your property.
The common spec for trimming in ROW, atleast in my neck of the woods is 15 feet to either side of the lines. If your tree is within 15 feet of the lines, which is sounds like it is, then you should be able to get a forester from the power company to assess the tree, and they will probably remove it at no cost to you, which is what it sounds like is going on. Again, based on my experiences in upstate NY.
As for CL&P, I did a bunch of work for them, big contracts for underground power transmission cables in the Bridgeport/Norwalk/Bethel areas. You would be amazed at how much they let slide, and how much slips through the cracks with those guys.
Again, it sounds like you have got this handled, if I pwer-read all of these posts accurately.
My two cents...
T