Wind Farm Repowering: Veggerslev, Denmark 🇩🇰
Academic Group Project — Politecnico di Torino
Wind and Ocean Energy Plants course (01TVKND), A.Y. 2025/26
Team: Dang-Chuong Ta (40%), Etienne Ronco (30%), Cem Durace (30%)
Project Overview
This study evaluates repowering the Veggerslev wind farm in Norddjurs, Denmark by replacing three aging Vestas V44-600 turbines (1.8 MW, commissioned 1998) with a single modern Vestas V82-1.65 MW turbine at 80m hub height [file:68]. Results demonstrate 33.3% increase in annual energy production (4,750→6,331 MWh/year), 38.4% LCOE reduction ($67.7→$41.7/MWh), positive NPV of $1.38M, IRR of 11.2%, and 7.87-year payback period.
What We Did
- Wind Climate Analysis: WAsP modeling and logarithmic wind profile analysis showing strongest winds from west/southwest (4.6-13.87 m/s).
- Performance Simulation: Compared original farm (4.75 GWh AEP, 30.1% capacity factor) vs. repowered (6.33 GWh AEP, 43.7% capacity factor) .
- Grid Connection Design: 7.5 km MV cable and 30 kV/132 kV transformer achieving 93.6% efficiency.
- Economic Evaluation: LCOE, NPV, IRR, and payback analysis over 20-year lifetime with 5.5% WACC.
Key Results
| Metric | Old Farm (V44) | New Farm (V82) | Change |
|---|---|---|---|
| AEP (MWh/year) | 4,750 | 6,331 | +33.3% |
| Capacity Factor | 30.1% | 43.7% | +13.6 pp |
| LCOE ($/MWh) | 67.7 | 41.7 | -38.4% |
| NPV ($) | -439,889 | +1,381,769 | +$1.82M |
| IRR (%) | 3.1 | 11.2 | +8.1 pp |
| Payback (years) | 14.7 | 7.87 | -46.5% |
Technical Drivers: Higher hub height (80m vs 40m), improved capacity factor (43.7% vs 30.1%), modern reliability (98% vs 93% availability), reduced OPEX (67.3% reduction).
Technologies Used
- WAsP wind resource modeling
- Wake loss simulation (Jensen/Park model)
- MV cable sizing & transformer design
- Financial modeling (LCOE, NPV, IRR, SPT)