How many watts of electricity can a typical windmill produce?

The typical wind system delivers roughly 8 to 10% of what systems are rated at 28 MPH. If the wind gusts over this amount the system shuts down. If the wind falls to 14 MPH you see 10% of rated. At 11 MPH you see nothing. To compensate for this issue, fossil fuel plants run in the background. The energy they use and CO2 output is ignored because wind generators are connected.

The overall effect is that no useful power is ever created if you consider the fossil fuel plants idling. Check out the number of birds killed each year by wind and you have a really bad system. They should be banned.