I, or someone in my group, hunts a very large powerline every year. We typically take 3-5 deer from that stand every year. It's nearly 150 yards wide and over 700 yards long across the property we have access to. It's very thick, and very productive.
Before buying I would, obviously, walk the property. But I believe you will see lots of deer sign on that right of way.
BE CAREFUL where you build/hang stands. The company will clear it every few years either chemically, or by cutting it. On ours they bring a helicopter in with a huge saw that cuts overhanging limbs. You wouldn't want to be in a stand on the edge when the helicopter shows up.
-Jake