Hi friends.
Sorry for my badly english, but there is problem:
Working of windmills is unstable: work within 1-2 hours and stop or decrease output energy.
when i try to measure the voltage i see this image
this is server game with online about 100
Why it possible?
Wind is unstable too, so no Wind => no Energy, wait until you get more Wind
Also if the windmills are at low height, it needs strong winds to produce energy. Try my setup 
[Following height and obstructions needs]
I'm pretty sure your wind mills are producing energy, but too few to measure within 4 ticks (like water mills).
when testing with your scanner, right click it once, then wait like 5-10 seconds, then click it again. double clicking it 2x in like not even 0.1 of a second isnt gonna give you any readings. also did you set up your batbox right? i have a feeling your batbox is aiming towards the windmills and not down towards the rest of the line....
