Answer by
LeheckaG (1826)
"Windmills" produce rotational-mechanical-energy.
A small "wind-generator" or "wind-turbine" produces from a few-hundred-watts to a few-thousand-watts depending on the its-capacity-rating and your-local-area's "wind-power-density",
Which is enough to run most-household's lighting & small-electronics demands.
You need to charge batteries and use an inverter to power your electric loads when the wind is not blowing.