Assuming that the windmill is twice as efficient as every other windmill and can extract 70% of that wind energy, we can estimate that your windmill will output roughly 35 watts of energy on average, enough to slow-charge a laptop, for a total of about 25 kWh per month.

And while this hypothetical example gives the best case scenario for home wind provided in our discussion, I can give you the real world data from a residential solar array. I'm one step away from Seattle's solar radiance. I just looked at my home solar data. Last month (March), I generated 36.3kWh from a single 405W rated panel for the month. This is calculated by the total monthly solar power generated divided by the number of panels I have on my roof. I can also tell you March is not a good month for solar in my northern state. During my best month (June) last year I generated 59kWh from the same single 405w rated panel.