it doesnt take very long at all! the bigger windfarms would obviously be cheaper since it is a 'bulk operation'
once they are payed off, it is cheap cheap energy, all they have too pay is land rental fee (the ones here are around $5,000 a year per tower to the land owner, so multiple towers on one owners property works out pretty good in their favor)
yep, huge pads of concrete, they extend about 16ft fron the edge of the tower, all the way around it.
all for control sensors, so the blades know when too turn and when too stop at the point they reach the most wind pressure.
and for diagnostics of how the inner equipment is operating
i did work for Henkels for a while.
now i am with Michels pipeline (they are out of WI) i work out of LU196
not sure who owns it. i believe the power is just being sold cross country ('on the grid') why so many people are against this stuff, no real benefit to the locals.