I don't know what's up, but for some reason several of my windmill in my wind farm have have turned into generators on my smp server. Along with that, it seems like something funky happens with your inventory when you try to figure out whats going on with them.
Random Generators:
Opening the Generator Inventory:
And if you haven't noticed, my inventory was different in each picture despite them being taken seconds apart. This is what my inventory should have looked like:
Could be one of those desync bugs, for the inventory.
TE code for wind generators have some interesting lines related to breakin from heavyload...
Windmills seem to turn into generators and drop iron when they break.
If a Windmill produces > 5 EUt, there's a chance proportional to the EU-5 for the Windmill to break of being overpowered.
Breaking > Returns some iron ingots, turns into Generator.
If you place Windmills high, you will have good chances for them to break on first thunderstorm.
