You can build a windmill for about $100 but it won't do much or you could spend millions and get a lot of power.
P.S. TO ALL THE FOLKS CONCIDERING ANSWERING THIS QUESTION. Sometimes you shouldn't answer questions! This is an Email I recieved from the person moments after I posted this: From: Big_Man! Subject: Turbines Message: Thank you very much. I want buy big tubines that i can sell energy to my country. i have finance. i will be glad if send me the price list if you know, and also it;s powers. As i know 2000 kW is cost about $2 mil. is that true? **************************************... Below is my original post: Are you talking about a COMMERCIAL wind turbine....the ones that generate power by the megawatt? The G.E. model costs $2 million dollars installed. If you are talking household ones, you can get one that might run a single lightbulb for about $200. For a system that actually powers your house, your probably looking at around $6000-$15,000, depending on the amount of power you need to generate for your house. ~Garnet Homesteading/Farming over 20 years