Wind Turbine
Calculate wind turbine power output, efficiency, RPM, and annual revenue from renewable energy. Enter blade length, wind speed, and Cp for instant results.
About This Calculator
The Wind Turbine Calculator helps you estimate the power output, efficiency, and revenue potential of horizontal-axis (HAWT) and vertical-axis wind turbines (VAWT). Enter your turbine's blade length or dimensions, local wind speed, turbine efficiency (Cp), and electricity tariff to compute swept area, available wind power, real output accounting for all losses, RPM, torque, and annual revenue.
Wind power is calculated using the standard physics formula P = 0.5 x ρ x v^3 x A where ρ is air density (1.225 kg/m^3), v is wind speed, and A is the swept area. The power coefficient Cp (limited by the Betz limit of 59.3%) combined with mechanical, electrical, wake, transmission, and downtime losses determines the real efficiency and final output power.
Regional Notes
India: Wind power tariffs range ₹2.5-5.0/kWh under PPAs. Average wind speeds of 6-8 m/s are common in coastal and windy regions. Default tariff: ₹5/kWh.
United States: Levelized cost of wind energy is $0.03-0.06/kWh. Average wind speeds of 7-9 m/s at 80m hub height. Default tariff: $0.12/kWh.
United Kingdom: Onshore wind CfD strike prices ~£40-50/MWh. Average wind speeds 7.5-9 m/s. Default tariff: £0.15/kWh.
Frequently Asked Questions
How do you calculate wind turbine power output?
Wind turbine power is calculated by first determining the swept area of the blades, then computing available wind power using the formula P = 0.5 x air density x wind speed^3 x swept area. The power coefficient Cp (typically 30-40%) is applied along with losses from mechanical, electrical, wake, transmission, and downtime factors to get real output power.
What is the Betz limit for wind turbines?
The Betz limit is 59.3%, the theoretical maximum efficiency of any wind turbine. It represents the maximum kinetic energy that can be extracted from wind. In practice, modern wind turbines achieve Cp values of 30-40% due to mechanical and electrical losses.
What is the difference between HAWT and VAWT turbines?
Horizontal Axis Wind Turbines (HAWT) rotate around a horizontal axis and are the most common onshore design with higher efficiency but require complex yaw mechanisms. Vertical Axis Wind Turbines (VAWT) rotate around a vertical axis, accept wind from any direction without yawing, and have simpler maintenance but lower efficiency.
How much revenue can a wind turbine generate per year?
Annual revenue depends on the turbine's power output and local electricity tariff. For example, a 100 kW turbine operating at 30% capacity factor with a tariff of ₹5/kWh can generate approximately ₹1,31,400 per year in India. US tariffs average $0.10-0.15/kWh, while UK tariffs average £0.12-0.18/kWh.
What size wind turbine is needed to power a home?
A 5-15 kW wind turbine is typically sufficient to power an average home, depending on local wind conditions and energy consumption. A 10 kW turbine with 7 m/s average wind speed can generate 15,000-25,000 kWh per year, covering most household electricity needs.
What factors affect wind turbine efficiency?
Wind turbine efficiency is affected by the power coefficient Cp (limited by Betz's law at 59.3%), mechanical losses in the gearbox and bearings (0-0.3%), electrical losses in the generator (1-1.5%), transmission losses to the grid (3-10%), wake losses from nearby turbines and terrain (3-10%), and downtime for maintenance (2-3%).
How does wind speed affect power generation?
Wind power is proportional to the cube of wind speed, meaning doubling wind speed increases available power by 8 times. A turbine at 10 m/s generates 8x more power than at 5 m/s. The usable wind speed range is typically 3-25 m/s, with rated output achieved around 12-15 m/s.
What are typical wind turbine electricity tariffs worldwide?
In India, wind power purchase agreements range from ₹2.5-5.0 per kWh. In the United States, the levelized cost of wind energy is $0.03-0.06/kWh with feed-in tariffs varying by state. In the United Kingdom, Contracts for Difference have strike prices around £40-50/MWh for onshore wind. Actual tariffs depend on location, project size, and policy incentives.