Wind Turbine Payback in Lower Connecticut River Valley Planning Region, CT
Wind turbine payback in Lower Connecticut River Valley 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 Lower Connecticut River Valley Planning Region, CT averages 3.85 m/s (8.6 mph). A 10 kW turbine there would make about 5,847 kWh a year, worth $1,606 at CT's 27.47¢/kWh. Against an installed cost of about $100,000, that is a payback of 62 years, and the turbine is built to last about 20.
What to do in Lower Connecticut River Valley Planning Region
A home turbine is not worth buying for savings in Lower Connecticut River Valley Planning Region unless your spot is far windier than the county average, 5.8 m/s at the hub against 3.85 m/s here. Per kW, solar panels would make about 1,142 kWh a year here against the turbine's 585, so get a solar quote first.
What would have to change
- Power would have to cost 86¢/kWh, 3.1 times what CT pays now.
- Or the average wind at the hub would have to be 5.8 m/s instead of 3.85. A taller tower or an exposed ridge can add some of that; a rooftop never will.
Against the rest of CT
Lower Connecticut River Valley Planning Region is the 2,176th 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 Lower Connecticut River Valley Planning Region
March is the strongest month here, at 4.52 m/s and about 802 kWh. August is the weakest, 3.11 m/s and 249 kWh, so the best month makes 3.2 times the worst. November to March brings in 59% of the year's output in Lower Connecticut River Valley Planning Region.
| Month | Wind at 30 m | Output | Worth |
|---|---|---|---|
| January | 4.49 m/s | 790 kWh | $217 |
| February | 4.60 m/s | 763 kWh | $210 |
| March | 4.52 m/s | 802 kWh | $220 |
| April | 4.09 m/s | 578 kWh | $159 |
| May | 3.49 m/s | 363 kWh | $100 |
| June | 3.18 m/s | 261 kWh | $72 |
| July | 3.11 m/s | 249 kWh | $68 |
| August | 3.11 m/s | 249 kWh | $68 |
| September | 3.37 m/s | 315 kWh | $87 |
| October | 3.90 m/s | 517 kWh | $142 |
| November | 4.10 m/s | 582 kWh | $160 |
| December | 4.32 m/s | 704 kWh | $193 |
What a taller tower would buy
Measured at 10 m the wind in Lower Connecticut River Valley Planning Region averages 2.54 m/s; at 50 m it is 4.67 m/s. That gives a shear exponent of 0.378, typical of rough, sheltered ground: trees or buildings slow the low wind a lot. Going from 20 m to 50 m takes output from 3,587 to 10,382 kWh a year, 189% 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 | 3.3 m/s | 3,587 kWh | over 100 years |
| 30 m | 3.85 m/s | 5,847 kWh | 62 years |
| 40 m | 4.29 m/s | 8,133 kWh | 45 years |
| 50 m | 4.67 m/s | 10,382 kWh | 35 years |
Counties around Lower Connecticut River Valley Planning Region
2 of the 6 closest counties are windier at turbine height; the windiest, Suffolk County, averages 6.01 m/s.
- South Central Connecticut Planning Region, CT: 3.65 m/s, 4,948 kWh, payback 74 years (20 mi)
- Southeastern Connecticut Planning Region, CT: 4.21 m/s, 7,678 kWh, payback 47 years (21 mi)
- Capitol Planning Region, CT: 3.52 m/s, 4,408 kWh, payback 83 years (28 mi)
- Naugatuck Valley Planning Region, CT: 3.65 m/s, 4,948 kWh, payback 74 years (32 mi)
- Suffolk County, NY: 6.01 m/s, 19,778 kWh, payback 17 years (35 mi)
- Northeastern Connecticut Planning Region, CT: 3.58 m/s, 4,653 kWh, payback 78 years (40 mi)
Sun versus wind in Lower Connecticut River Valley Planning Region
Lower Connecticut River Valley Planning Region gets 3.91 kWh of sunshine per square metre a day on average. One kW of solar panels here would make roughly 1,142 kWh a year; one kW of the turbine above makes 585. Kilowatt for kilowatt, panels make 2.0 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.