Wind Turbine Payback in Bethel Census Area, AK
Wind turbine payback in Bethel Census Area
No. The turbine wears out before it pays for itself.
At 30 m, the height a home turbine tower usually reaches, the wind in Bethel Census Area, AK averages 5.27 m/s (11.8 mph). A 10 kW turbine there would make about 14,397 kWh a year, worth $3,933 at AK's 27.32¢/kWh. Against an installed cost of about $100,000, that is a payback of 25 years, and the turbine is built to last about 20.
What to do in Bethel Census Area
A home turbine is not worth buying for savings in Bethel Census Area unless your spot is far windier than the county average, 5.8 m/s at the hub against 5.27 m/s here. Per kW, solar panels would make about 742 kWh a year here against the turbine's 1,440, so get a solar quote first.
What would have to change
- Power would have to cost 35¢/kWh, 1.3 times what AK pays now.
- Or the average wind at the hub would have to be 5.8 m/s instead of 5.27. A taller tower or an exposed ridge can add some of that; a rooftop never will.
Against the rest of AK
Bethel Census Area is the 1,333rd windiest of 3,144 US counties at turbine height; the national middle is 4.79 m/s. The windiest in AK is Aleutians West Census Area at 9.35 m/s, payback 9 years.
Month by month in Bethel Census Area
January is the strongest month here, at 6.45 m/s and about 1,957 kWh. June is the weakest, 3.95 m/s and 518 kWh, so the best month makes 3.8 times the worst. November to March brings in 58% of the year's output in Bethel Census Area.
| Month | Wind at 30 m | Output | Worth |
|---|---|---|---|
| January | 6.45 m/s | 1,957 kWh | $535 |
| February | 6.76 m/s | 1,944 kWh | $531 |
| March | 5.48 m/s | 1,352 kWh | $369 |
| April | 5.23 m/s | 1,162 kWh | $317 |
| May | 4.47 m/s | 780 kWh | $213 |
| June | 3.95 m/s | 518 kWh | $142 |
| July | 4.20 m/s | 650 kWh | $178 |
| August | 4.30 m/s | 696 kWh | $190 |
| September | 4.89 m/s | 972 kWh | $266 |
| October | 5.50 m/s | 1,363 kWh | $372 |
| November | 5.81 m/s | 1,502 kWh | $410 |
| December | 6.27 m/s | 1,844 kWh | $504 |
What a taller tower would buy
Measured at 10 m the wind in Bethel Census Area averages 4.15 m/s; at 50 m it is 5.89 m/s. That gives a shear exponent of 0.218, typical of ordinary open country. Going from 20 m to 50 m takes output from 11,364 to 18,890 kWh a year, 66% 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 | 4.82 m/s | 11,364 kWh | 32 years |
| 30 m | 5.27 m/s | 14,392 kWh | 25 years |
| 40 m | 5.61 m/s | 16,837 kWh | 22 years |
| 50 m | 5.89 m/s | 18,890 kWh | 19 years |
Counties around Bethel Census Area
5 of the 6 closest counties are windier at turbine height; the windiest, Lake and Peninsula Borough, averages 6.45 m/s.
- Dillingham Census Area, AK: 6.07 m/s, 20,223 kWh, payback 18 years (116 mi)
- Kusilvak Census Area, AK: 6.25 m/s, 21,558 kWh, payback 17 years (137 mi)
- Bristol Bay Borough, AK: 6.2 m/s, 21,187 kWh, payback 17 years (187 mi)
- Lake and Peninsula Borough, AK: 6.45 m/s, 23,038 kWh, payback 16 years (235 mi)
- Kenai Peninsula Borough, AK: 3.87 m/s, 5,942 kWh, payback 62 years (268 mi)
- Nome Census Area, AK: 5.74 m/s, 17,785 kWh, payback 21 years (295 mi)
Sun versus wind in Bethel Census Area
Bethel Census Area gets 2.54 kWh of sunshine per square metre a day on average. One kW of solar panels here would make roughly 742 kWh a year; one kW of the turbine above makes 1,440. This is one of the rare places where a kilowatt of turbine out-produces a kilowatt of panels, by 1.9 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.