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It depends on the size of the windmill and its power output. A ten-kilowatt windmill costs about $40,000 (minus government rebates etc...in California, you can pay as little as $20,000 after rebates). Such a windmill will pay off itself in electricity generated in less than 15 years (faster if you can get paid for feeding electricity back to the grid), and last for at least 25-30 years.

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14y ago

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