it may just be the angle of the shot but is the new nest built for these ospreys below the tree level? they may not like that, i dont think it is a height thing as much as a clear view of the surrounding area - which usually makes it a height thing.
one funny aside - last year driving up the road between the marsh early in the a.m. an osprey flew over me with all he could do handling the what seemed to be a half a tree that he found - lol - i thought to myself if he dropped that and it came thru my windshield i would be skewered and they would have a hell of a time trying to figure out how that came to be. lol - also my wife had a clam drop on her ($300 plus) windshield shattering it while driving up the same road - birds can be expensive.
.
send the power company the pic of the traffic cones it is a really quick easy fix.