Many participants in wind power technology

Wind power suppliers: There is a large community of manufacturers and developers whose scope of supply ranges from complete wind turbine systems to hardware and software components and to numerous auxiliary subsystems that make up a wind farm. See list, photos, links.


Power generating potential of Alstom 6-MW prototype DD wind turbine is indicated by its 150-m (492 ft) rotor diameter and 73.5-m blade length. Rotor speed range of 4-11.5 rpm is notably low. Courtesy: AlstomElectric power generation from wind energy is a relatively young but growing industry. In some parts of the world it has shown remarkable growth. Looking ahead, realities of market economics and political issues may not support the same continued growth—at least in some parts of the world.

Siemens 3 MW direct-drive turbine has nacelle dimensions of 6.8 m length x 4.2 m diameter (22.3 ft L x 13.8 ft dia.), enabling transport by standard vehicles. The outer- rotor generator design helps reduce nacelle weight. Courtesy: SiemensThis article updates the original one posted on CE’s Web site in August 2009. (Link to that and many related wind turbine articles below, including videos.)

The focus here is on direct-drive (DD) wind turbine technology that eliminates the gearbox from the drivetrain (see August 2011 CE article on DD wind turbines linked below).

The following is a selected listing of supplier companies to the multimegawatt (MW) wind turbine market. Only DD turbine offerings are listed, but all companies in the first table also make geared turbines, with the exception of Enercon GmbH. The list is not comprehensive—and does not include turbine erection or maintenance services.

 Suppliers of Large Wind Turbines (>1 MW)




HQ Location


Direct-Drive (Gearless)

Turbine Offering


Acciona Energy










New generation offshore 6 MW

Prototype 2011

Serial production 2014


Clipper Windpower






DeWind *










Gearless turbines only

5 models in 2-3 MW range

E-126 rated 7.5 MW








GE Energy




GE (4.1-113)            4.1 MW     offshore optimized


Mitsubishi Power Systems










N150/6000                6 MW

Prototype 2012-13

Serial production 2014


Northern Power Systems




NPS 2.3                  2.3 MW


Siemens Energy




SWT-2.3-113          2.3 MW

SWT-3.0-101             3 MW 

SWT-6.0-120             6 MW

Prototype 2011-13

Serial production 2014 for 6 MW


STX Windpower






STX 82        1.5 MW, 2 MW

STX 93                      2 MW


Suzlon Energy












Windtec **






*   part of Daewoo Shipbuilding and Marine Engineering Co. Ltd.

** subsidiary of American Superconductor Corp.

Suppliers of Subsystems/Components for Large Wind Turbines



Technology/Products Offered






Variable-frequency drives (VFDs); converters; induction and PM synchronous generators; transformers; switchgear


American Superconductor


Power converters;

control systems



Bachmann electronic GmbH


Controllers; condition monitoring systems; grid measurement and monitoring modules


Beckhoff Automation


PC-based controls;

I/O terminals; wind farm networking


Bosch Rexroth


Pitch and yaw drives (electromechanical and hydraulic); yaw and drivetrain brake systems 


Cooper Power Systems


Software for power trans-mission/distribution analysis; transformers; distribution switchgear


Dataforth Corp.


Signal conditioners for a variety of sensors; fiber-optic communication modules


Eaton Corp.


Hydraulic pitch control systems; hydraulic rotor brake control; remote condition monitoring


Moog Inc.


Electric and hydraulic blade-pitch control; brush slip rings; fiber-optic remote rotor monitoring



National Instruments


Hardware/software for pitch/yaw control; turbine condition monitoring (blade, generator)



Parker Hannifin Corp.


Rotor brake components; pitch systems; power control/inverter modules


The Switch Controls & Converters


PM synchronous and other generators;

full-power converters



Frank J. Bartos, PE, is a Control Engineering contributing content specialist. Reach him at

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