Wind Turbine Payback in Allegheny County, PA
Wind turbine payback in Allegheny 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 Allegheny County, PA averages 3.49 m/s (7.8 mph). A 10 kW turbine there would make about 4,289 kWh a year, worth $906 at PA's 21.13¢/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 Allegheny County
A home turbine is not worth buying for savings in Allegheny County unless your spot is far windier than the county average, 6.5 m/s at the hub against 3.49 m/s here. Per kW, solar panels would make about 1,086 kWh a year here against the turbine's 429, so get a solar quote first.
What would have to change
- Power would have to cost 117¢/kWh, 5.5 times what PA pays now.
- Or the average wind at the hub would have to be 6.5 m/s instead of 3.49. A taller tower or an exposed ridge can add some of that; a rooftop never will.
Against the rest of PA
Allegheny County is the 2,519th windiest of 3,144 US counties at turbine height; the national middle is 4.79 m/s. The windiest in PA is Philadelphia County at 4.74 m/s, payback 44 years.
Month by month in Allegheny County
January is the strongest month here, at 4.20 m/s and about 649 kWh. August is the weakest, 2.67 m/s and 147 kWh, so the best month makes 4.4 times the worst. November to March brings in 60% of the year's output in Allegheny County.
| Month | Wind at 30 m | Output | Worth |
|---|---|---|---|
| January | 4.20 m/s | 649 kWh | $137 |
| February | 4.28 m/s | 620 kWh | $131 |
| March | 4.07 m/s | 587 kWh | $124 |
| April | 3.96 m/s | 525 kWh | $111 |
| May | 3.27 m/s | 295 kWh | $62 |
| June | 2.98 m/s | 208 kWh | $44 |
| July | 2.72 m/s | 156 kWh | $33 |
| August | 2.67 m/s | 147 kWh | $31 |
| September | 2.90 m/s | 189 kWh | $40 |
| October | 3.40 m/s | 335 kWh | $71 |
| November | 3.63 m/s | 401 kWh | $85 |
| December | 3.86 m/s | 500 kWh | $106 |
What a taller tower would buy
Measured at 10 m the wind in Allegheny County averages 2.17 m/s; at 50 m it is 4.35 m/s. That gives a shear exponent of 0.432, typical of rough, sheltered ground: trees or buildings slow the low wind a lot. Going from 20 m to 50 m takes output from 2,393 to 8,460 kWh a year, 254% 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 | 2.93 m/s | 2,393 kWh | over 100 years |
| 30 m | 3.49 m/s | 4,283 kWh | over 100 years |
| 40 m | 3.95 m/s | 6,330 kWh | 75 years |
| 50 m | 4.35 m/s | 8,460 kWh | 56 years |
Counties around Allegheny County
1 of the 6 closest counties is windier at turbine height; the windiest, Westmoreland County, averages 3.57 m/s.
- Washington County, PA: 3.45 m/s, 4,133 kWh, payback over 100 years (23 mi)
- Beaver County, PA: 3.44 m/s, 4,094 kWh, payback over 100 years (24 mi)
- Westmoreland County, PA: 3.57 m/s, 4,612 kWh, payback over 100 years (29 mi)
- Butler County, PA: 3.49 m/s, 4,289 kWh, payback over 100 years (31 mi)
- Hancock County, WV: 3.44 m/s, 4,094 kWh, payback over 100 years (31 mi)
- Brooke County, WV: 3.44 m/s, 4,094 kWh, payback over 100 years (34 mi)
Sun versus wind in Allegheny County
Allegheny County gets 3.72 kWh of sunshine per square metre a day on average. One kW of solar panels here would make roughly 1,086 kWh a year; one kW of the turbine above makes 429. Kilowatt for kilowatt, panels make 2.5 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.