Wind Turbine Payback in Norman County, MN
Wind turbine payback in Norman County
No. The turbine wears out before it pays for itself.
At 30 m, the height a home turbine tower usually reaches, the wind in Norman County, MN averages 6.37 m/s (14.2 mph). A 10 kW turbine there would make about 22,447 kWh a year, worth $3,690 at MN's 16.44¢/kWh. Against an installed cost of about $100,000, that is a payback of 27 years, and the turbine is built to last about 20.
What to do in Norman County
A home turbine is not worth buying for savings in Norman County unless your spot is far windier than the county average, 7.5 m/s at the hub against 6.37 m/s here. Per kW, solar panels would make about 1,121 kWh a year here against the turbine's 2,245, so get a solar quote first.
What would have to change
- Power would have to cost 22¢/kWh, 1.4 times what MN pays now.
- Or the average wind at the hub would have to be 7.5 m/s instead of 6.37. A taller tower or an exposed ridge can add some of that; a rooftop never will.
Against the rest of MN
Norman County is the 380th windiest of 3,144 US counties at turbine height; the national middle is 4.79 m/s. The windiest in MN is Lincoln County at 6.68 m/s, payback 25 years.
Month by month in Norman County
October is the strongest month here, at 6.81 m/s and about 2,179 kWh. July is the weakest, 5.60 m/s and 1,425 kWh, so the best month makes 1.5 times the worst. November to March brings in 42% of the year's output in Norman County.
| Month | Wind at 30 m | Output | Worth |
|---|---|---|---|
| January | 6.38 m/s | 1,910 kWh | $314 |
| February | 6.38 m/s | 1,725 kWh | $284 |
| March | 6.62 m/s | 2,062 kWh | $339 |
| April | 6.91 m/s | 2,172 kWh | $357 |
| May | 6.69 m/s | 2,106 kWh | $346 |
| June | 6.12 m/s | 1,695 kWh | $279 |
| July | 5.60 m/s | 1,425 kWh | $234 |
| August | 5.70 m/s | 1,486 kWh | $244 |
| September | 6.52 m/s | 1,935 kWh | $318 |
| October | 6.81 m/s | 2,179 kWh | $358 |
| November | 6.58 m/s | 1,974 kWh | $325 |
| December | 6.24 m/s | 1,825 kWh | $300 |
What a taller tower would buy
Measured at 10 m the wind in Norman County averages 5.07 m/s; at 50 m it is 7.09 m/s. That gives a shear exponent of 0.208, typical of ordinary open country. Going from 20 m to 50 m takes output from 18,666 to 27,684 kWh a year, 48% more, before counting the extra cost of the taller tower. Why tower height decides it explains the shear behind these numbers.
| Hub height | Average wind | Output | Payback |
|---|---|---|---|
| 20 m | 5.86 m/s | 18,666 kWh | 33 years |
| 30 m | 6.38 m/s | 22,486 kWh | 27 years |
| 40 m | 6.77 m/s | 25,373 kWh | 24 years |
| 50 m | 7.09 m/s | 27,684 kWh | 22 years |
Counties around Norman County
3 of the 6 closest counties are windier at turbine height; the windiest, Becker County, averages 6.62 m/s.
- Clay County, MN: 6.45 m/s, 23,038 kWh, payback 26 years (30 mi)
- Mahnomen County, MN: 6.56 m/s, 23,849 kWh, payback 26 years (31 mi)
- Polk County, MN: 6.34 m/s, 22,225 kWh, payback 27 years (31 mi)
- Traill County, ND: 6.29 m/s, 21,855 kWh, payback 37 years (34 mi)
- Red Lake County, MN: 6.34 m/s, 22,225 kWh, payback 27 years (41 mi)
- Becker County, MN: 6.62 m/s, 24,289 kWh, payback 25 years (43 mi)
Sun versus wind in Norman County
Norman County gets 3.84 kWh of sunshine per square metre a day on average. One kW of solar panels here would make roughly 1,121 kWh a year; one kW of the turbine above makes 2,245. This is one of the rare places where a kilowatt of turbine out-produces a kilowatt of panels, by 2.0 times. Panel output assumes an 80% system performance ratio. Wind or solar runs the same comparison for every county.
How this is worked out
Wind is NASA's Power climate record, the 2001-2025 average at 10 m and 50 m for the county's centre, carried to 30 m with this county's own measured wind shear and spread into hours with a Rayleigh distribution. The turbine is a generic 10 kW, 7 m rotor machine with 10% losses. Cost is $10,000 per kW installed with no tax credit, because the federal one ended in 2025. One county-centre number cannot see your hilltop or your tree line, so treat it as the starting point for a site survey, not a substitute. The full method and its weak spots are in how the numbers are made.