"The total cost of 1-kilowatt wind turbine is around $9,000, excluding batteries. With an average wind speed of 9 mph, the estimated annual output is about 1,800 kwh. For a system large enough to provide all of your own energy, say close to 960 kwh per month for the average U.S. home, the costs can be significantly higher."
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Per their Statement the math reveals:
1800 kWh @.15 = $270
$9000 / $270 = 33.33 years until payback on investment.
If the turbine lasts for 25 years this results in a 25% loss
8760 (EAO) = 1 kWh (NPR) x 365 x 24
1800 / 8760 = 20.54% Actual estimated output
Net metering may reduce the payback time but the net metering in Maine payback is lower than the wholesale price of .05 /kWh the last I knew. This was what they once used as market price values. (this may be different today, but I hold doubts) That .05/ kWh may also be offset by distribution fees.
Their recommended tower height being 100 feet (31m), and stated to be the majority of the expense.
They make claims of No pollution, though they neglect to reveal that which was emitted during a full LCA. And neglect to address that pollution which is created when storage, & electronic control metering / conversion devices are used, or their LCA.