UFO Flies Off Wind Turbine — What The Heck Is It? (VIDEO)

It’s obviously not a UFO in the sense of  “aliens taking over the world” or anything, but this video shows a rather large weird semi-opaque object flying off a wind turbine in Maine.
Any wind power experts have an insight into what the heck it might be?
Here’s the video:

Here’s a screenshot I took pointing out the strange wind turbine object, it’s a little hard to see at first. You can email me at: kevin [at] energyboom.com or leave your guess in the comment section.