Repowering · Technology · Generation Comparison

Turbine Classes in Repowering

Which legacy turbines are currently being replaced by which modern platforms? Three generations define the German fleet: pioneer turbines from 1996–2002, the 2 MW class from 2002–2010, and the first multi-MW turbines from 2010 onward. Replacement turbines are typically one size category up.

Typical Legacy Turbines in the German Fleet

Manufacturer / type	Capacity	Hub height	Rotor	Build years
Vestas V44 / V47	600 / 660 kW	40–55 m	44–47 m	1995–2002
Enercon E40	500 / 600 kW	46–65 m	40 m	1994–2003
Vestas V52 / V66	850 kW / 1.65 MW	55–70 m	52–66 m	2000–2005
Enercon E66	1.5 / 1.8 / 2.0 MW	67–98 m	66–70 m	2001–2008
Nordex N50 / N60	800 kW / 1.3 MW	46–69 m	50–60 m	1996–2002
Vestas V80 / V90	1.8 / 2.0 MW	70–100 m	80–90 m	2003–2010
Enercon E70 / E82	2.0 / 2.3 MW	85–113 m	71–82 m	2005–2012
REpower MM82 / MM92	2.05 MW	78–100 m	82–92 m	2003–2010

Modern Repowering Turbines 2026

Manufacturer / type	Capacity	Hub height	Rotor	Market launch
Vestas V162-6.0 / V162-7.2	6.0 / 7.2 MW	119–166 m	162 m	2022
Vestas V172-7.2	7.2 MW	175 m	172 m	2024
Enercon E160 EP5	4.6 / 5.5 MW	120–166 m	160 m	2020
Enercon E175 EP5	6.0 / 7.0 MW	150–175 m	175 m	2025
Nordex N163/6.X	5.6 / 6.8 MW	118–164 m	163 m	2022
Nordex N175/6.X	6.8 MW	179 m	175 m	2025
Siemens Gamesa SG170-6.6	6.6 MW	115–165 m	170 m	2023
GE Cypress 6.1-164	6.1 MW	120–161 m	164 m	2021

Typical Repowering Configurations

Old configuration	Typical new configuration	Yield multiplier
10 × 600 kW (V44)	2 × 6.0 MW (V162)	approx. 3.8×
8 × 1.5 MW (E66)	3 × 6.0 MW (V162)	approx. 2.4×
6 × 2.0 MW (V90)	3 × 5.5 MW (E160)	approx. 1.8×
5 × 2.3 MW (E82)	3 × 6.0 MW (N163)	approx. 1.5×

Why So Much More Yield?

Three levers multiply the energy output:

Hub height: wind speed increases with height (logarithmic wind profile). From 67 m to 165 m means approximately 25–35% more wind speed at the rotor
Rotor swept area: energy capture increases with the square of the diameter. From 66 m to 162 m = 6× more rotor area
Turbine efficiency: modern aerodynamics, lower specific power rating, improved generator efficiency — 10–15% more efficiency overall

Turbine Classes per IEC 61400-1

Class I: high-wind sites (v ≥ 10 m/s at hub height) — coastal locations, ridge tops
Class II: medium wind (8.5–10 m/s) — northern Germany, open inland sites
Class III: low wind (7.5–8.5 m/s) — low mountain ranges, southern inland areas
Class S: site-specific — custom adaptation for extreme conditions

Practical tip: The correct turbine class depends not only on the mean wind speed but also on turbulence (classes A/B/C). A Class I turbine in a turbulent park position may be impermissible — in that case a Class S variant is required.

Repowering turbine classes: old vs. new with yield multipliers — 10×600 kW to 2×6 MW (3.8x), 8×1.5 MW to 3×6 MW (2.4x), 6×2 MW to 3×5.5 MW (1.8x), 5×2.3 MW to 3×6 MW (1.5x). Yield drivers: hub height, rotor area, efficiency. IEC classes I/II/III

Turbine class comparison — yield multipliers and IEC wind classes

Low-Wind Turbines for Southern Sites

Southern Germany and low-wind inland sites require low-wind turbines with large rotors paired with smaller generators:

Vestas V162-5.0 / V172-5.0 (5 MW with 162/172 m rotor)
Enercon E160 EP3 (4.6 MW with 160 m rotor)
Nordex N163/5.X (5.6 MW with 163 m rotor)

These achieve rated output frequently even at 5.5–6.5 m/s mean wind speed and accumulate high full-load hours.

Turbine selection for your repowering site?

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Frequently Asked Questions

Which manufacturer dominates German repowering in 2026?

Estimated market shares in the 2024–2026 repowering wave: Vestas approx. 35%, Enercon approx. 25%, Nordex approx. 20%, Siemens Gamesa approx. 15%, GE approx. 5%. Local manufacturer presence and service conditions typically matter more than the turbine platform alone.

How do the new 175 m rotors affect permitting?

Larger turbines require larger setback distances due to noise, shadow flicker, and ice throw. In densely populated areas, turbine selection becomes a limiting factor — a smaller E160 with reduced throw distance may be permissible where a 6 MW V172 would not pass approval.

What does a modern 6 MW turbine cost?

Typical turnkey investment: 6–8 million EUR per turbine (as of 2026), including foundation, grid connection, and road construction. Without site development, from 4.5 million EUR.