Wind Turbine Payback in Marion County, MS
Wind turbine payback in Marion 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 Marion County, MS averages 2.9 m/s (6.5 mph). A 10 kW turbine there would make about 2,315 kWh a year, worth $349 at MS's 15.06¢/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 Marion County
A home turbine is not worth buying for savings in Marion County unless your spot is far windier than the county average, 7.9 m/s at the hub against 2.9 m/s here. Per kW, solar panels would make about 1,349 kWh a year here against the turbine's 232, so get a solar quote first.
What would have to change
- Power would have to cost 216¢/kWh, 14.3 times what MS pays now.
- Or the average wind at the hub would have to be 7.9 m/s instead of 2.9. A taller tower or an exposed ridge can add some of that; a rooftop never will.
Against the rest of MS
Marion County is the 3,106th windiest of 3,144 US counties at turbine height; the national middle is 4.79 m/s. The windiest in MS is DeSoto County at 5.13 m/s, payback 50 years.
Month by month in Marion County
March is the strongest month here, at 3.29 m/s and about 302 kWh. July is the weakest, 2.24 m/s and 74 kWh, so the best month makes 4.1 times the worst. November to March brings in 56% of the year's output in Marion County.
| Month | Wind at 30 m | Output | Worth |
|---|---|---|---|
| January | 3.19 m/s | 273 kWh | $41 |
| February | 3.28 m/s | 269 kWh | $41 |
| March | 3.29 m/s | 302 kWh | $45 |
| April | 3.26 m/s | 284 kWh | $43 |
| May | 2.85 m/s | 184 kWh | $28 |
| June | 2.44 m/s | 101 kWh | $15 |
| July | 2.24 m/s | 74 kWh | $11 |
| August | 2.33 m/s | 87 kWh | $13 |
| September | 2.65 m/s | 139 kWh | $21 |
| October | 2.94 m/s | 206 kWh | $31 |
| November | 3.14 m/s | 249 kWh | $37 |
| December | 3.17 m/s | 266 kWh | $40 |
What a taller tower would buy
Measured at 10 m the wind in Marion County averages 1.67 m/s; at 50 m it is 3.75 m/s. That gives a shear exponent of 0.503, typical of rough, sheltered ground: trees or buildings slow the low wind a lot. Going from 20 m to 50 m takes output from 1,088 to 5,387 kWh a year, 395% 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 | 2.37 m/s | 1,088 kWh | over 100 years |
| 30 m | 2.9 m/s | 2,315 kWh | over 100 years |
| 40 m | 3.35 m/s | 3,764 kWh | over 100 years |
| 50 m | 3.75 m/s | 5,387 kWh | over 100 years |
Counties around Marion County
4 of the 6 closest counties are windier at turbine height; the windiest, Jefferson Davis County, averages 2.95 m/s.
- Walthall County, MS: 2.9 m/s, 2,315 kWh, payback over 100 years (17 mi)
- Lamar County, MS: 2.93 m/s, 2,398 kWh, payback over 100 years (19 mi)
- Jefferson Davis County, MS: 2.95 m/s, 2,455 kWh, payback over 100 years (23 mi)
- Lawrence County, MS: 2.95 m/s, 2,455 kWh, payback over 100 years (28 mi)
- Washington Parish, LA: 2.9 m/s, 2,315 kWh, payback over 100 years (29 mi)
- Covington County, MS: 2.92 m/s, 2,370 kWh, payback over 100 years (32 mi)
Sun versus wind in Marion County
Marion County gets 4.62 kWh of sunshine per square metre a day on average. One kW of solar panels here would make roughly 1,349 kWh a year; one kW of the turbine above makes 232. Kilowatt for kilowatt, panels make 5.8 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.