[aerohead]

Some sort of 'reality' must have intruded onto their plans.
I suspect that, conventional, horizontal axis turbines have a distinct advantage with respect to starting torque, and un-mutilated flow field at each blade.
Their chord 'beam' web depth aligns more with their operational orientation, whereas with a vertical axis, they'd be inclined to 'fold' and buckle under the force of gravity ( we don't use I-beams turned on their sides ).
Winds blow at night as well.