Wind Turbine Payback in Callaway County, MO
Wind turbine payback in Callaway 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 Callaway County, MO averages 4.55 m/s (10.2 mph). A 10 kW turbine there would make about 9,641 kWh a year, worth $1,377 at MO's 14.28¢/kWh. Against an installed cost of about $100,000, that is a payback of 73 years, and the turbine is built to last about 20.
What to do in Callaway County
A home turbine is not worth buying for savings in Callaway County unless your spot is far windier than the county average, 8.2 m/s at the hub against 4.55 m/s here. Per kW, solar panels would make about 1,235 kWh a year here against the turbine's 964, so get a solar quote first.
What would have to change
- Power would have to cost 52¢/kWh, 3.6 times what MO pays now.
- Or the average wind at the hub would have to be 8.2 m/s instead of 4.55. A taller tower or an exposed ridge can add some of that; a rooftop never will.
Against the rest of MO
Callaway County is the 1,719th windiest of 3,144 US counties at turbine height; the national middle is 4.79 m/s. The windiest in MO is Atchison County at 6.17 m/s, payback 33 years.
Month by month in Callaway County
March is the strongest month here, at 5.23 m/s and about 1,199 kWh. August is the weakest, 3.56 m/s and 388 kWh, so the best month makes 3.1 times the worst. November to March brings in 53% of the year's output in Callaway County.
| Month | Wind at 30 m | Output | Worth |
|---|---|---|---|
| January | 5.09 m/s | 1,114 kWh | $159 |
| February | 5.12 m/s | 1,024 kWh | $146 |
| March | 5.23 m/s | 1,199 kWh | $171 |
| April | 5.23 m/s | 1,160 kWh | $166 |
| May | 4.45 m/s | 770 kWh | $110 |
| June | 4.00 m/s | 542 kWh | $77 |
| July | 3.56 m/s | 388 kWh | $55 |
| August | 3.56 m/s | 388 kWh | $55 |
| September | 3.94 m/s | 514 kWh | $73 |
| October | 4.63 m/s | 858 kWh | $123 |
| November | 4.90 m/s | 974 kWh | $139 |
| December | 4.89 m/s | 1,002 kWh | $143 |
What a taller tower would buy
Measured at 10 m the wind in Callaway County averages 3.22 m/s; at 50 m it is 5.34 m/s. That gives a shear exponent of 0.314, typical of rough, sheltered ground: trees or buildings slow the low wind a lot. Going from 20 m to 50 m takes output from 6,602 to 14,892 kWh a year, 126% 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 | 4 m/s | 6,602 kWh | over 100 years |
| 30 m | 4.55 m/s | 9,632 kWh | 73 years |
| 40 m | 4.98 m/s | 12,391 kWh | 57 years |
| 50 m | 5.34 m/s | 14,892 kWh | 47 years |
Counties around Callaway County
1 of the 6 closest counties is windier at turbine height; the windiest, Boone County, averages 5.43 m/s.
- Boone County, MO: 5.43 m/s, 15,534 kWh, payback 45 years (23 mi)
- Montgomery County, MO: 4.55 m/s, 9,641 kWh, payback 73 years (26 mi)
- Osage County, MO: 3.65 m/s, 4,948 kWh, payback over 100 years (26 mi)
- Audrain County, MO: 4.55 m/s, 9,641 kWh, payback 73 years (27 mi)
- Cole County, MO: 4.55 m/s, 9,641 kWh, payback 73 years (30 mi)
- Gasconade County, MO: 3.63 m/s, 4,862 kWh, payback over 100 years (35 mi)
Sun versus wind in Callaway County
Callaway County gets 4.23 kWh of sunshine per square metre a day on average. One kW of solar panels here would make roughly 1,235 kWh a year; one kW of the turbine above makes 964. Kilowatt for kilowatt, panels make 1.3 times as much here as the turbine. 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.