This is a little off topic but mildly interesting stuff. I recently (over the past few months) watched the construction of what I guess is one of the largest wind turbines on the North American Continent. It went in behind where I work so when I took breaks I would go out and watch the progress. The unit was installed at Lincoln Electric in Cleveland, Ohio USA.
Turbine by the numbers
800,000: Approximate total weight in pounds, including the turbine and & tower
279: Turbine hub height in feet
444: Height of top blade tip in feet
165: Length of each blade in feet
2.5: Maximum output of electricity in megawatts (2,500,000 watts) at 690 volts direct current, converted to 4,160 volts AC on the ground for use in Lincoln's shops.
The thing is a monster, everything around it that was big is now dwarfed in its shadow. The blades are actually fixed pitch and the thing has a hell of a gearbox at the hub. Rotational speed at the blades is only about 15 RPM when generating full power of 2.5 MW. Think about 2.5 MW at 690 VDC? The down bus has to be huge! This thing was shipped from Germany.
This is one of several articles about it that ran locally and includes a picture of it during build. A Google of Lincoln Electric Wind Turbine will bring up other articles and images of the beast.
Interesting as I mentioned was the use of fixed pitch and not variable blades. However, it is a DC generator sitting up there. The inverters also must be huge to run the 4160 VAC @ 2.5 MW.
Ron