Wind Turbine Payback in Petersburg city, VA
Wind turbine payback in Petersburg city
No. The turbine wears out before it pays for itself.
At 30 m, the height a home turbine tower usually reaches, the wind in Petersburg city, VA averages 3.25 m/s (7.3 mph). A 10 kW turbine there would make about 3,402 kWh a year, worth $577 at VA's 16.95¢/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 Petersburg city
A home turbine is not worth buying for savings in Petersburg city unless your spot is far windier than the county average, 7.3 m/s at the hub against 3.25 m/s here. Per kW, solar panels would make about 1,247 kWh a year here against the turbine's 340, so get a solar quote first.
What would have to change
- Power would have to cost 147¢/kWh, 8.7 times what VA pays now.
- Or the average wind at the hub would have to be 7.3 m/s instead of 3.25. A taller tower or an exposed ridge can add some of that; a rooftop never will.
Against the rest of VA
Petersburg city is the 2,816th windiest of 3,144 US counties at turbine height; the national middle is 4.79 m/s. The windiest in VA is Northampton County at 7.01 m/s, payback 22 years.
Month by month in Petersburg city
March is the strongest month here, at 3.77 m/s and about 467 kWh. August is the weakest, 2.57 m/s and 127 kWh, so the best month makes 3.7 times the worst. November to March brings in 54% of the year's output in Petersburg city.
| Month | Wind at 30 m | Output | Worth |
|---|---|---|---|
| January | 3.61 m/s | 406 kWh | $69 |
| February | 3.76 m/s | 416 kWh | $71 |
| March | 3.77 m/s | 467 kWh | $79 |
| April | 3.75 m/s | 443 kWh | $75 |
| May | 3.22 m/s | 280 kWh | $47 |
| June | 2.87 m/s | 182 kWh | $31 |
| July | 2.65 m/s | 143 kWh | $24 |
| August | 2.57 m/s | 127 kWh | $22 |
| September | 2.89 m/s | 188 kWh | $32 |
| October | 3.17 m/s | 266 kWh | $45 |
| November | 3.36 m/s | 311 kWh | $53 |
| December | 3.39 m/s | 332 kWh | $56 |
What a taller tower would buy
Measured at 10 m the wind in Petersburg city averages 1.92 m/s; at 50 m it is 4.15 m/s. That gives a shear exponent of 0.479, typical of rough, sheltered ground: trees or buildings slow the low wind a lot. Going from 20 m to 50 m takes output from 1,739 to 7,354 kWh a year, 323% 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 | 2.68 m/s | 1,739 kWh | over 100 years |
| 30 m | 3.25 m/s | 3,399 kWh | over 100 years |
| 40 m | 3.73 m/s | 5,294 kWh | over 100 years |
| 50 m | 4.15 m/s | 7,354 kWh | 80 years |
Counties around Petersburg city
4 of the 6 closest counties are windier at turbine height; the windiest, Colonial Heights city, averages 3.6 m/s.
- Colonial Heights city, VA: 3.6 m/s, 4,736 kWh, payback over 100 years (4 mi)
- Hopewell city, VA: 3.6 m/s, 4,736 kWh, payback over 100 years (8 mi)
- Prince George County, VA: 3.25 m/s, 3,402 kWh, payback over 100 years (10 mi)
- Chesterfield County, VA: 3.6 m/s, 4,736 kWh, payback over 100 years (16 mi)
- Dinwiddie County, VA: 3.25 m/s, 3,402 kWh, payback over 100 years (16 mi)
- Henrico County, VA: 3.6 m/s, 4,736 kWh, payback over 100 years (17 mi)
Sun versus wind in Petersburg city
Petersburg city gets 4.27 kWh of sunshine per square metre a day on average. One kW of solar panels here would make roughly 1,247 kWh a year; one kW of the turbine above makes 340. Kilowatt for kilowatt, panels make 3.7 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.