Originally posted by robtcorl The wind was kicking ass on our way back, but these things seem to spin at the same speed no matter the velocity.
The speeds the blades turn is by design. Engineers worked out the optimum size and weight to make the best use of the wind.
The blades turn a reduction gear, which in turn rotates the generator. It may look like they are turning slowly, but the generator is turning the speed required to make electricity.
You might also notice that sometimes the wind will be blowing but the blades aren't turning. This is because they use a complex algorithm to balance the productivity of each windmill over time to get the most from each one over its lifetime.
A lot more to wind energy that one sees while driving by.