Wind Energy Calculator
Estimate annual wind energy production, financial savings, and CO2 offset based on your local wind speed, turbine diameter, hub height, and efficiency.
Annual average at your location
Rotor diameter (blade tip to tip)
Height of the turbine hub above ground
Typical: 30-45% (Betz limit: 59.3%)
Your current utility rate (US avg: $0.16/kWh)
Frequently Asked Questions
What wind speed do I need for a wind turbine?
Most small wind turbines need an average annual wind speed of at least 9-10 mph (class 2+) to be economically viable. Wind class 3+ (12+ mph) is considered good for wind energy. Check NREL wind maps or install an anemometer to measure your site.
What is the Betz limit?
The Betz limit (59.3%) is the theoretical maximum percentage of kinetic energy that a wind turbine can extract from the wind. In practice, most turbines achieve 35-45% efficiency. It was proven by physicist Albert Betz in 1919 and is a fundamental law of wind energy.
How much does a residential wind turbine cost?
Small residential wind turbines (2-10 kW) cost $3,000-$8,000 per kW installed, or roughly $10,000-$80,000 total. Larger systems (10-100 kW) for farms or businesses cost $3,000-$5,000 per kW. Federal tax credits (currently 30% ITC) significantly reduce the net cost.