Wind Turbine Payback in Renville County, ND
Wind turbine payback in Renville 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 Renville County, ND averages 6.51 m/s (14.6 mph). A 10 kW turbine there would make about 23,481 kWh a year, worth $2,926 at ND's 12.46¢/kWh. Against an installed cost of about $100,000, that is a payback of 34 years, and the turbine is built to last about 20.
What to do in Renville County
A home turbine is not worth buying for savings in Renville County unless your spot is far windier than the county average, 9.1 m/s at the hub against 6.51 m/s here. Per kW, solar panels would make about 1,136 kWh a year here against the turbine's 2,348, so get a solar quote first.
What would have to change
- Power would have to cost 21¢/kWh, 1.7 times what ND pays now.
- Or the average wind at the hub would have to be 9.1 m/s instead of 6.51. A taller tower or an exposed ridge can add some of that; a rooftop never will.
Against the rest of ND
Renville County is the 193rd windiest of 3,144 US counties at turbine height; the national middle is 4.79 m/s. The windiest in ND is Bowman County at 6.79 m/s, payback 31 years.
Month by month in Renville County
October is the strongest month here, at 6.96 m/s and about 2,275 kWh. July is the weakest, 5.69 m/s and 1,477 kWh, so the best month makes 1.5 times the worst. November to March brings in 44% of the year's output in Renville County.
| Month | Wind at 30 m | Output | Worth |
|---|---|---|---|
| January | 6.89 m/s | 2,231 kWh | $278 |
| February | 6.39 m/s | 1,732 kWh | $216 |
| March | 6.74 m/s | 2,136 kWh | $266 |
| April | 6.81 m/s | 2,110 kWh | $263 |
| May | 6.64 m/s | 2,075 kWh | $259 |
| June | 6.14 m/s | 1,702 kWh | $212 |
| July | 5.69 m/s | 1,477 kWh | $184 |
| August | 5.76 m/s | 1,522 kWh | $190 |
| September | 6.43 m/s | 1,883 kWh | $235 |
| October | 6.96 m/s | 2,275 kWh | $283 |
| November | 6.95 m/s | 2,196 kWh | $274 |
| December | 6.74 m/s | 2,136 kWh | $266 |
What a taller tower would buy
Measured at 10 m the wind in Renville County averages 5.19 m/s; at 50 m it is 7.24 m/s. That gives a shear exponent of 0.207, typical of ordinary open country. Going from 20 m to 50 m takes output from 19,624 to 28,741 kWh a year, 46% 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 | 5.99 m/s | 19,624 kWh | 41 years |
| 30 m | 6.51 m/s | 23,507 kWh | 34 years |
| 40 m | 6.91 m/s | 26,420 kWh | 30 years |
| 50 m | 7.24 m/s | 28,741 kWh | 28 years |
Counties around Renville County
2 of the 6 closest counties are windier at turbine height; the windiest, Mountrail County, averages 6.53 m/s.
- Ward County, ND: 6.49 m/s, 23,333 kWh, payback 34 years (35 mi)
- Bottineau County, ND: 5.7 m/s, 17,492 kWh, payback 46 years (38 mi)
- Burke County, ND: 6.41 m/s, 22,743 kWh, payback 35 years (40 mi)
- Mountrail County, ND: 6.53 m/s, 23,628 kWh, payback 34 years (47 mi)
- McHenry County, ND: 6.42 m/s, 22,817 kWh, payback 35 years (57 mi)
- McLean County, ND: 6.52 m/s, 23,554 kWh, payback 34 years (74 mi)
Sun versus wind in Renville County
Renville County gets 3.89 kWh of sunshine per square metre a day on average. One kW of solar panels here would make roughly 1,136 kWh a year; one kW of the turbine above makes 2,348. This is one of the rare places where a kilowatt of turbine out-produces a kilowatt of panels, by 2.1 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.