How many kw windmill will I need?

I'm just wondering how big a windmill I will need (in terms of KW), to make a significant difference in my electrical bill. I want to buy or make a windmill, and buy an grid tie inverter (the type that just plugs into a power outlet). I'm hoping this will be fairly straightforward? If anyone has any... show more I'm just wondering how big a windmill I will need (in terms of KW), to make a significant difference in my electrical bill.

I want to buy or make a windmill, and buy an grid tie inverter (the type that just plugs into a power outlet).

I'm hoping this will be fairly straightforward?
If anyone has any info on doing a similar thing, that would be great. Including price, how well it worked. etc

thanks so much
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