Wind Repowering Uplift Calculator
Realistic Weibull-based energy estimate — repowering site (old tn/sahyadri belt) preset, 3000 kW machine.
Repowering swaps five 1990s 250 kW machines for one modern 3 MW on taller towers — typically 3–5× the energy from the same land. Estimate the new machine's AEP at your site's wind and compare it against the vintage fleet's metered history.
AEP integrates a standard cubic power curve (cut-in 3, rated 12, cut-out 25 m/s) over the Weibull wind distribution fitted to your mean speed and shape factor. Screening accuracy ±10% — bankable studies need the OEM curve and on-site met data.
Engineering estimate from published standards and typical equipment data. Site conditions, equipment datasheets and measured data govern the real result — confirm with a qualified engineer.
Use the free Wind Repowering Uplift Calculator online — Realistic Weibull-based energy estimate — repowering site (old tn/sahyadri belt) preset, 3000 kW machine. Runs instantly in your browser: no signup, no upload, mobile-friendly.
About Wind Repowering Uplift Calculator
Repowering swaps five 1990s 250 kW machines for one modern 3 MW on taller towers — typically 3–5× the energy from the same land. Estimate the new machine's AEP at your site's wind and compare it against the vintage fleet's metered history.
How to use Wind Repowering Uplift Calculator
- 1Enter the turbine rating and your site's mean wind speed at hub height.
- 2Adjust the Weibull shape factor for your wind regime.
- 3Read AEP, capacity factor and energy per MW installed.
Why use Wind Repowering Uplift Calculator?
- ✓Weibull statistics — how wind is actually distributed, not just averaged
- ✓Numerical integration over a standard power curve, transparent assumptions
- ✓Regional wind-speed and shape-factor presets
- ✓AEP, CF and per-MW yield for instant comparisons
Frequently asked questions
How is annual energy production estimated from mean wind speed?+
Mean speed alone underestimates badly — energy lives in the distribution's gusty tail. The Weibull fit (mean + shape factor k) reconstructs the full speed histogram, and integrating the power curve over it gives AEP within ±10% of professional screening tools.
What is the Weibull shape factor k?+
It describes wind steadiness: k≈1.6–1.9 means gusty/variable (some temperate sites), k≈2 the common default, k≈2.5–3+ remarkably steady trade winds (Brazil's northeast, parts of Tamil Nadu). Same mean speed, different k, can move AEP 10–15%.
What mean wind speed makes a site viable?+
Rough gates at hub height: below 5.5 m/s rarely pencils for grid-scale; 6.5–7.5 m/s is solid; above 8 m/s excellent. Small wind needs the same speeds at far lower hub heights — which is why most residential sites fail (see the small-wind tools for honest math).
Why does the Wind Repowering Uplift Calculator differ from my consultant's number?+
Screening vs engineering: this integrates a standardized power curve over fitted statistics; bankable studies use the OEM's exact curve, on-site met-mast data, wake and loss models. Expect ±10% agreement — close enough to rank sites and sanity-check claims, not to finance them.
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