What Is Wind Turbine Repowering?
Repowering means replacing old wind turbines with new, more powerful ones at the same or a nearby site. The goal: generate significantly more energy from fewer turbines — often with better public acceptance, because fewer, modern turbines replace many older ones.
The Typical Repowering Configuration
A classic real-world example from 2026:
| Configuration | Old turbines | New turbines |
|---|---|---|
| Number | 8 × 1.5 MW | 3 × 6.0 MW |
| Hub height | 67 m | 165 m |
| Rotor diameter | 66 m | 162 m |
| Total capacity | 12.0 MW | 18.0 MW |
| Full-load hours | approx. 1,900 h/a | approx. 3,000 h/a |
| Annual yield | approx. 22,800 MWh | approx. 54,000 MWh |
| Yield factor | 1.0× | 2.4× |
With less than half the number of turbines, more than double the electricity is generated.
Why Repowering Now?
Three drivers converge in 2026:
- EEG expiry for pioneer turbines. Turbines that were connected to the grid between 2000 and 2005 reached the end of their 20-year EEG (Renewable Energy Sources Act) remuneration between 2020 and 2025. Continue or repower? is the urgent question for approximately 5,000 existing turbines per year.
- Technical generation leaps. Modern turbines produce roughly 50–60% more energy per installed MW than legacy turbines (higher hub = better wind, larger rotor = more energy capture per wind speed).
- Political tailwind. Section 2 EEG (“overriding public interest”) and the Wind-an-Land-Gesetz (Onshore Wind Act) facilitate permits at existing sites.
Repowering vs. Continued Operation vs. Greenfield
| Option | Effort | Yield | Risk |
|---|---|---|---|
| Continued operation > 20 yr | Maintenance + wear repairs | +0% | Rising downtime, difficult spare parts |
| Repowering 1:1 | Full investment, but existing infrastructure | +200–300% | BImSchG process, acceptance |
| Greenfield new build | Full investment + new infrastructure | Fresh site, often lower quality | + Site risk |
Advantages of Repowering over Greenfield
- Local acceptance: Existing turbines are established; repowering is typically better accepted than new builds on previously undeveloped land
- Existing infrastructure: Access roads, grid connection, and lease agreements can partly be reused
- WaLG simplifications: Preferential treatment in the BImSchG (Federal Immission Control Act) permitting process
- Lower impact balance in the LBP: Less new intervention because existing turbines are decommissioned
- Proven site: Wind resource data from years of operation available
Repowering — old vs. new, drivers, and decision matrix
Repowering study for your site?
We connect you with an experienced repowering planning firm for an initial economic and permitting pre-assessment.
Request consultationFrequently Asked Questions
Can every old turbine be repowered?
In principle yes, but not every site is worthwhile. Unsuitable cases include: too close to residential areas (minimum setback distance not achievable with a larger turbine), in or adjacent to protected areas (FFH compatibility assessment problematic), in states with blanket restrictions (Bavaria 10H rule), or with poor grid connections.
What does “1:1 repowering” mean?
A single turbine swap — same number of turbines, new turbine type at the same location. The WaLG (Onshore Wind Act, 2022) created procedural simplifications for this. “Full repowering” with layout changes requires a standard BImSchG procedure.
Is repowering economically viable without EEG funding?
At premium sites (coastal, > 3,500 FLH) increasingly yes — electricity can be sold via PPA to industrial customers. At standard sites, the EEG market premium remains necessary. See Economics.