Wind Turbine Payback in Lancaster County, SC
Wind turbine payback in Lancaster 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 Lancaster County, SC averages 3.44 m/s (7.7 mph). A 10 kW turbine there would make about 4,094 kWh a year, worth $651 at SC's 15.9¢/kWh. Against an installed cost of about $100,000, that is a payback of over 100 years, and the turbine is built to last about 20.
What to do in Lancaster County
A home turbine is not worth buying for savings in Lancaster County unless your spot is far windier than the county average, 7.6 m/s at the hub against 3.44 m/s here. Per kW, solar panels would make about 1,332 kWh a year here against the turbine's 409, so get a solar quote first.
What would have to change
- Power would have to cost 122¢/kWh, 7.7 times what SC pays now.
- Or the average wind at the hub would have to be 7.6 m/s instead of 3.44. A taller tower or an exposed ridge can add some of that; a rooftop never will.
Against the rest of SC
Lancaster County is the 2,573rd windiest of 3,144 US counties at turbine height; the national middle is 4.79 m/s. The windiest in SC is Beaufort County at 5.71 m/s, payback 36 years.
Month by month in Lancaster County
April is the strongest month here, at 4.02 m/s and about 551 kWh. August is the weakest, 2.73 m/s and 160 kWh, so the best month makes 3.4 times the worst. November to March brings in 51% of the year's output in Lancaster County.
| Month | Wind at 30 m | Output | Worth |
|---|---|---|---|
| January | 3.73 m/s | 448 kWh | $71 |
| February | 3.85 m/s | 447 kWh | $71 |
| March | 3.94 m/s | 535 kWh | $85 |
| April | 4.02 m/s | 551 kWh | $88 |
| May | 3.48 m/s | 360 kWh | $57 |
| June | 3.02 m/s | 218 kWh | $35 |
| July | 2.83 m/s | 181 kWh | $29 |
| August | 2.73 m/s | 160 kWh | $25 |
| September | 3.25 m/s | 280 kWh | $45 |
| October | 3.42 m/s | 341 kWh | $54 |
| November | 3.56 m/s | 375 kWh | $60 |
| December | 3.54 m/s | 381 kWh | $61 |
What a taller tower would buy
Measured at 10 m the wind in Lancaster County averages 2.17 m/s; at 50 m it is 4.27 m/s. That gives a shear exponent of 0.421, typical of rough, sheltered ground: trees or buildings slow the low wind a lot. Going from 20 m to 50 m takes output from 2,324 to 8,008 kWh a year, 245% 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 | 2.9 m/s | 2,324 kWh | over 100 years |
| 30 m | 3.44 m/s | 4,109 kWh | over 100 years |
| 40 m | 3.89 m/s | 6,023 kWh | over 100 years |
| 50 m | 4.27 m/s | 8,008 kWh | 79 years |
Counties around Lancaster County
2 of the 6 closest counties are windier at turbine height; the windiest, Chesterfield County, averages 4.46 m/s.
- Union County, NC: 3.43 m/s, 4,056 kWh, payback over 100 years (23 mi)
- Kershaw County, SC: 3.44 m/s, 4,094 kWh, payback over 100 years (25 mi)
- Chester County, SC: 3.02 m/s, 2,661 kWh, payback over 100 years (26 mi)
- Chesterfield County, SC: 4.46 m/s, 9,100 kWh, payback 69 years (31 mi)
- Fairfield County, SC: 3.02 m/s, 2,661 kWh, payback over 100 years (31 mi)
- York County, SC: 3.65 m/s, 4,948 kWh, payback over 100 years (34 mi)
Sun versus wind in Lancaster County
Lancaster County gets 4.56 kWh of sunshine per square metre a day on average. One kW of solar panels here would make roughly 1,332 kWh a year; one kW of the turbine above makes 409. Kilowatt for kilowatt, panels make 3.3 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.