Wind Turbine Payback in Northwest Hills Planning Region, CT
Wind turbine payback in Northwest Hills Planning Region
No. The turbine wears out before it pays for itself.
At 30 m, the height a home turbine tower usually reaches, the wind in Northwest Hills Planning Region, CT averages 3.53 m/s (7.9 mph). A 10 kW turbine there would make about 4,449 kWh a year, worth $1,222 at CT's 27.47¢/kWh. Against an installed cost of about $100,000, that is a payback of 82 years, and the turbine is built to last about 20.
What to do in Northwest Hills Planning Region
A home turbine is not worth buying for savings in Northwest Hills Planning Region unless your spot is far windier than the county average, 5.8 m/s at the hub against 3.53 m/s here. Per kW, solar panels would make about 1,130 kWh a year here against the turbine's 445, so get a solar quote first.
What would have to change
- Power would have to cost 112¢/kWh, 4.1 times what CT pays now.
- Or the average wind at the hub would have to be 5.8 m/s instead of 3.53. A taller tower or an exposed ridge can add some of that; a rooftop never will.
Against the rest of CT
Northwest Hills Planning Region is the 2,484th windiest of 3,144 US counties at turbine height; the national middle is 4.79 m/s. The windiest in CT is Greater Bridgeport Planning Region at 5.26 m/s, payback 25 years.
Month by month in Northwest Hills Planning Region
March is the strongest month here, at 4.22 m/s and about 657 kWh. August is the weakest, 2.81 m/s and 176 kWh, so the best month makes 3.7 times the worst. November to March brings in 60% of the year's output in Northwest Hills Planning Region.
| Month | Wind at 30 m | Output | Worth |
|---|---|---|---|
| January | 4.13 m/s | 617 kWh | $169 |
| February | 4.31 m/s | 631 kWh | $173 |
| March | 4.22 m/s | 657 kWh | $180 |
| April | 3.85 m/s | 482 kWh | $132 |
| May | 3.25 m/s | 288 kWh | $79 |
| June | 2.93 m/s | 197 kWh | $54 |
| July | 2.82 m/s | 179 kWh | $49 |
| August | 2.81 m/s | 176 kWh | $48 |
| September | 3.02 m/s | 220 kWh | $60 |
| October | 3.44 m/s | 347 kWh | $95 |
| November | 3.64 m/s | 403 kWh | $111 |
| December | 3.89 m/s | 511 kWh | $140 |
What a taller tower would buy
Measured at 10 m the wind in Northwest Hills Planning Region averages 2.17 m/s; at 50 m it is 4.42 m/s. That gives a shear exponent of 0.442, typical of rough, sheltered ground: trees or buildings slow the low wind a lot. Going from 20 m to 50 m takes output from 2,450 to 8,865 kWh a year, 262% 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 | 2.95 m/s | 2,450 kWh | over 100 years |
| 30 m | 3.53 m/s | 4,435 kWh | 82 years |
| 40 m | 4 m/s | 6,602 kWh | 55 years |
| 50 m | 4.42 m/s | 8,865 kWh | 41 years |
Counties around Northwest Hills Planning Region
2 of the 6 closest counties are windier at turbine height; the windiest, Naugatuck Valley Planning Region, averages 3.65 m/s.
- Naugatuck Valley Planning Region, CT: 3.65 m/s, 4,948 kWh, payback 74 years (24 mi)
- Dutchess County, NY: 3.37 m/s, 3,830 kWh, payback 89 years (28 mi)
- Capitol Planning Region, CT: 3.52 m/s, 4,408 kWh, payback 83 years (33 mi)
- Columbia County, NY: 3.37 m/s, 3,830 kWh, payback 89 years (34 mi)
- Berkshire County, MA: 3.61 m/s, 4,778 kWh, payback 69 years (36 mi)
- Hampden County, MA: 3.52 m/s, 4,408 kWh, payback 75 years (36 mi)
Sun versus wind in Northwest Hills Planning Region
Northwest Hills Planning Region gets 3.87 kWh of sunshine per square metre a day on average. One kW of solar panels here would make roughly 1,130 kWh a year; one kW of the turbine above makes 445. 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.