Wind Turbine Energy Yield Calculator
Estimate annual generation, capacity factor and per-unit cost from rotor diameter and site wind speed.
Result
- Swept rotor area
- 11,310m²
- Annual generation
- 15,107MWh
- Capacity factor (PLF)
- 69.0%
- Levelised cost of energy
- ₹0.64
- Households supplied
- 12,589homes
- CO₂ avoided per year
- 10,726tonnes
Estimates only. Nothing you type is stored or sent anywhere — the calculation runs entirely in your browser.
How this works
Wind power scales with the cube of wind speed, which is why site selection dominates every other variable. A site averaging 7 m/s produces roughly 1.6 times the energy of a site averaging 6 m/s with the identical turbine. No amount of better hardware compensates for a poor wind resource.
The physics here is the standard power equation: half the air density, multiplied by swept rotor area, multiplied by wind speed cubed, multiplied by the power coefficient. Because you are entering an average wind speed rather than a full distribution, the calculator applies a Rayleigh correction factor of 1.91 to the cube of the mean — using the mean cubed directly would understate output by roughly half, a very common mistake in back-of-envelope wind estimates.
Output is then capped at the turbine's rated capacity, because a real machine cannot exceed its generator rating no matter how hard the wind blows. An availability factor accounts for maintenance downtime and grid curtailment, which in high-penetration states like Tamil Nadu and Karnataka is a material deduction rather than a rounding error.
Common questions
- What is a good capacity factor for Indian wind?
- Onshore Indian sites typically deliver 22–32%. Best-in-class sites in Tamil Nadu, Gujarat and Karnataka with tall hub heights can exceed 35%. Anything below 20% rarely clears a commercial hurdle rate.
- Why does hub height matter so much?
- Wind speed increases with height above ground following a shear profile. Going from a 80 m to a 120 m hub can lift the average wind speed 8–12%, which after the cube law translates to a 25–40% jump in energy.
- Is the power coefficient of 0.40 realistic?
- Yes for modern utility turbines across their working range. The theoretical Betz limit is 0.593; well-designed machines reach 0.45–0.50 at optimum tip-speed ratio and average closer to 0.35–0.42 over a real year.