Wind Power Estimator
I built this tool because residential wind power is one of the most oversold and misunderstood topics in home energy. The marketing brochures show spinning turbines on hilltops and promise thousands in savings, but the reality for most homeowners is far less exciting. Wind energy works well at utility scale and on genuinely windy rural properties. For the average suburban lot, solar panels are almost always a better investment per dollar spent.
That said, there are situations where a small wind turbine makes sense. If you live on acreage with consistent 12+ mph winds, few obstructions, and permissive zoning, the numbers can work in your favor. Tower height matters more than most people realize. Wind speed increases significantly as you get above the tree line and local ground turbulence, which is why a turbine on a short tower in a neighborhood rarely produces what the spec sheet promises. Terrain is the other big variable. A hilltop site with open exposure will generate two or three times the energy of a suburban lot at the same rated wind speed.
Use this calculator to get a rough estimate for your specific situation. Plug in your local average wind speed, pick a turbine size, adjust for your terrain, and see what the payback looks like. If the verdict comes back marginal or not recommended, I would take that seriously. These estimates already use generous assumptions about availability and capacity factor.
Your Estimate
How the Math Works
The core formula is P = 0.5 × ρ × A × V³ × Cp × availability, where ρ is air density (1.225 kg/m³ at sea level), A is the swept area of the rotor, V is wind speed in meters per second, Cp is the power coefficient (capped at the Betz limit of 0.593, realistic turbines hit 0.25 to 0.35), and availability accounts for downtime from maintenance, calm days, and cut-in/cut-out speed limits.
In practice, most residential turbines produce far less than their rated capacity. A "5 kW turbine" is rated at 5 kW in a specific design wind speed, often 25 to 28 mph. At 12 mph, that same turbine produces a fraction of its rated output. The capacity factor, meaning actual production divided by theoretical maximum, ranges from about 15% in low-wind suburban settings to 35% on windy hilltops.
The terrain adjustment reflects how ground-level obstacles reduce effective wind speed at the rotor. Open fields have minimal friction. Suburban lots with houses, fences, and scattered trees create turbulence that cuts into production significantly. Tower height helps overcome this, which is why the industry rule of thumb is to mount your rotor at least 30 feet above anything within 500 feet. Few residential installations actually achieve this.
Cost estimates in this tool reflect 2026 installed prices for common small wind systems, including the turbine, tower, inverter, wiring, permits, and labor. Actual quotes will vary by region and installer. The payback calculation uses the national average residential electricity rate of $0.16 per kWh. If your rate is higher, payback will be shorter. If you have cheap power, it will be longer.
When Wind Actually Makes Sense
The sweet spot for residential wind is a rural property with at least half an acre of open land, average winds above 12 mph, and a tower tall enough to clear any obstacles. Hilltop sites are even better because they get natural wind acceleration from the terrain. If you have all three of those factors, a 5 kW or 10 kW turbine can meaningfully offset your electric bill and pay for itself within a reasonable timeframe.
The honest answer for most suburban homeowners is that solar panels on your roof will produce more energy per dollar invested, require less maintenance, face fewer zoning hurdles, and deliver a faster payback. I say this as someone who finds wind turbines genuinely interesting. The physics just favor solar for most residential situations in 2026.
If you want to explore further, check your area's wind resource on the DOE Small Wind Guidebook and talk to your local zoning office before getting any quotes. Many municipalities have height restrictions that make effective residential wind installations impossible regardless of your wind speed.