OK, just for fun and games (and to review the 3d tools in 2010) I've ripped this one out for you.
I've use (meters) for units and the Base Point is the Bottom of a 500' tower and a modified dihedral blade (40 meters)
a generic nose cone and generator housing structure on top. You might want to rev or extrude a main axle to connect the blades/hub to the Generator box should that angle be in view in your renders. I did not round the tips of the turbine blades; not that they all are, for your stated needs that shouldn't be an issue. You have most of the primatives so have fun!
What I might do from here, is apply some basic material (white paint) to most of it and a decal/image map to the turbine housing for the (utility, client. or your company logo), then save 3 or 4 versions with different rotations applied to the blades. Then insert these as reference blocks to build up the wind farm.