Yeah, the main problem might be that the powerplant often suddenly appears over the windmill. Maybe you can make it so that it slowly fades in before checking windmill collisions, giving you some time get out of the way?

No, I meant that the windmill moves up/down/left/right way too slow to possibly avoid the power plants. And it is too dangerous to go to the edge where there seems to be the most wind because the power plants just seem to pop out of nowhere around the edges.

It slightly reminds me of this game: http://pingus.seul.org/