A closer look at the windmills

Another view of the windmills

The Searsburg Wind Power Facility

Here are some pages of interest:
http://www.gmpvt.com/whoweare/searsburg.shtml
http://www.williams.edu/Geoscience/greenenergy/searsburg.htm

To see a Quicktime clip of the windmills turning and the sound they're making...
Click Here
(Note the clip is 3.56 mb in size)
The "rumbling" you are hearing is the sound they make...

Here is an Audio Only clip... (here)