Wind Turbine Payback in Seminole County, FL
Wind turbine payback in Seminole 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 Seminole County, FL averages 4.65 m/s (10.4 mph). A 10 kW turbine there would make about 10,257 kWh a year, worth $1,571 at FL's 15.32¢/kWh. Against an installed cost of about $100,000, that is a payback of 64 years, and the turbine is built to last about 20.
What to do in Seminole County
A home turbine is not worth buying for savings in Seminole County unless your spot is far windier than the county average, 7.8 m/s at the hub against 4.65 m/s here. Per kW, solar panels would make about 1,422 kWh a year here against the turbine's 1,026, so get a solar quote first.
What would have to change
- Power would have to cost 49¢/kWh, 3.2 times what FL pays now.
- Or the average wind at the hub would have to be 7.8 m/s instead of 4.65. A taller tower or an exposed ridge can add some of that; a rooftop never will.
Against the rest of FL
Seminole County is the 1,659th windiest of 3,144 US counties at turbine height; the national middle is 4.79 m/s. The windiest in FL is Brevard County at 5.62 m/s, payback 39 years.
Month by month in Seminole County
March is the strongest month here, at 5.31 m/s and about 1,246 kWh. July is the weakest, 3.38 m/s and 327 kWh, so the best month makes 3.8 times the worst. November to March brings in 54% of the year's output in Seminole County.
| Month | Wind at 30 m | Output | Worth |
|---|---|---|---|
| January | 5.29 m/s | 1,236 kWh | $189 |
| February | 5.14 m/s | 1,037 kWh | $159 |
| March | 5.31 m/s | 1,246 kWh | $191 |
| April | 5.09 m/s | 1,081 kWh | $166 |
| May | 4.64 m/s | 864 kWh | $132 |
| June | 3.78 m/s | 453 kWh | $69 |
| July | 3.38 m/s | 327 kWh | $50 |
| August | 3.63 m/s | 413 kWh | $63 |
| September | 4.36 m/s | 698 kWh | $107 |
| October | 4.93 m/s | 1,027 kWh | $157 |
| November | 5.18 m/s | 1,131 kWh | $173 |
| December | 5.14 m/s | 1,148 kWh | $176 |
What a taller tower would buy
Measured at 10 m the wind in Seminole County averages 3.49 m/s; at 50 m it is 5.32 m/s. That gives a shear exponent of 0.262, typical of ordinary open country. Going from 20 m to 50 m takes output from 7,540 to 14,750 kWh a year, 96% 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 | 4.18 m/s | 7,540 kWh | 87 years |
| 30 m | 4.65 m/s | 10,279 kWh | 64 years |
| 40 m | 5.02 m/s | 12,655 kWh | 52 years |
| 50 m | 5.32 m/s | 14,750 kWh | 44 years |
Counties around Seminole County
1 of the 6 closest counties is windier at turbine height; the windiest, Brevard County, averages 5.62 m/s.
- Orange County, FL: 4.65 m/s, 10,257 kWh, payback 64 years (17 mi)
- Volusia County, FL: 4.38 m/s, 8,632 kWh, payback 76 years (25 mi)
- Lake County, FL: 4.42 m/s, 8,865 kWh, payback 74 years (36 mi)
- Brevard County, FL: 5.62 m/s, 16,907 kWh, payback 39 years (38 mi)
- Osceola County, FL: 4.57 m/s, 9,763 kWh, payback 67 years (44 mi)
- Flagler County, FL: 4.01 m/s, 6,628 kWh, payback 99 years (55 mi)
Sun versus wind in Seminole County
Seminole County gets 4.87 kWh of sunshine per square metre a day on average. One kW of solar panels here would make roughly 1,422 kWh a year; one kW of the turbine above makes 1,026. Kilowatt for kilowatt, panels make 1.4 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.