Small Wind Turbine Calculator — Home & Farm Output 2026

Understanding your results

Wind power scales as the cube of wind speed: This is the most critical factor in wind economics. Doubling your wind speed multiplies power output by 8 (2³ = 8). A site averaging 12 mph produces roughly 3.4× more energy than a similar site at 8 mph. Before purchasing any wind turbine, measure actual wind speed at your site with an anemometer for at least 3–6 months — never rely on regional weather data alone.

Minimum viable wind speed: Most small wind turbines require an average annual wind speed of 10–12 mph (4.5–5.4 m/s) to produce economically meaningful output. Below 8 mph annual average, wind turbines rarely pay back within the system lifespan. NREL’s Wind Energy Resource Atlas provides free wind speed maps for all US states.

Capacity factor: The capacity factor is the ratio of actual annual production to theoretical maximum production if running at rated power 24/7. Small wind turbines typically have capacity factors of 15–35% depending on site wind. The calculator uses a cubic wind speed correlation to estimate capacity factor. Good sites (12+ mph) achieve 25–35%; marginal sites (8–10 mph) achieve 10–20%.

Federal and state incentives: Small wind turbines (≤100 kW) qualify for the federal 30% ITC under Section 48E through 2032. Some states also offer additional production incentives, property tax exemptions, and net metering credits for small wind. DSIRE.org lists all state-level wind incentives.

Zoning and setback requirements: Small wind turbines are subject to local zoning ordinances and setback requirements (typically 1.1× tower height from property boundaries). Turbines over 65 feet tall often require building permits. Homeowners associations frequently prohibit wind turbines outright. Verify local rules before investing.