High-Tech for Everybody

With sales prices of five to nine eurocent wind energy is the most efficient source of energy already today. A modern six MW installation can produce enough power to cover the annual needs of approximately 7,000 households. In some German regions more than one third of energy needs are covered by wind energy, nationwide it is eight percent. 

Precision job in lofty heights
Pulling the nacelle
Installation of the tower on delicate ground
Installation of the tower in Costa Rica

There are many locations in the inland with constant, strong wind that can be turned into energy. Wind is converted into kinetic energy, which is then turned into power. We select the adequate turbine for every location and every wind velocity. Technical basic construction and the way of energy production are always the same and vary only in small details.

Rotor Blades

When a rotor blade is in contact with wind, the airflow is deflected at the wind leaving edge. At the arched top the airflow has to take a longer way than at the relatively straight underside. That results in sub pressure at the upper side and in over pressure at the lower side. To compensate the difference, the air presses the wing upwards from below, the blades start moving. Modern wind energy turbines have three rotor blades made from fibreglass materials or carbon fibre reinforced plastics and have a pitch regulation. A blade shifting mechanism reacts to an electronic signal. If there is a strong breeze, the turbine turns the rotor blades away from the wind; in a storm so far, that the rotor does not turn any more.


 - gearless

The nacelle at the top of the tower accommodates generator, cooling, electronic control devices and yaw mechanism. Their cladding is often made from plastic; however, there are also steel nacelles. Gearless nacelles have a higher diameter because of a bigger generator and are usually round or oval.


- geared

The nacelle at the top of the tower accommodates gears, generator, cooling, electronic control devices and yaw mechanism. Their cladding is often made from plastic; however, there are also metal nacelles. Geared nacelles have usually a longer form.


The gear raises the low speed of the rotor shaft (often less than 50 rotations per minute) to the necessary nominal speed; for the impulse of a standard generator with a frequency of 50 hertz, this is 1,500 rotations per minute.


Ring Generator for Gearless Turbines

Ring generators are multi-pole generators for turbines with pitch regulation. They have a lower speed and need no gear. Wear and tear, mechanical load, proneness to repair and noise development are substantially lower than with conventional generators. Their life span is higher, their production, however, more elaborate and the weight higher.


Generator for Geared Turbines

The generator converts the rotation into power: In his case metal reels arranged on the axis rotate in a strong magnetic field. The electrons flow into one direction through the reel. Power and voltage are produced. The wattage of a modern generators are between 500 and 6,000 kw.


Steel Towers

Most modern wind turbines have hollow towers from steel. Their conical form strengthen the stability and save material. Steel towers can be usually established quickly.


Grid Towers

Grid towers made from steel are the best-priced option. The material consumption is only half compared to for example an empty steel pipe tower – often finished shapes can be used. However, grid towers are rather maintenance intensive.


Concrete Towers

Today the long construction times of concrete towers can be shortened using prefabricated construction technologies. With it also very high towers can be established; there are no serious transportation problems with concrete towers and they are cheaper than steel towers.


Hybrid Towers

In some locations logistical obstacles complicate the construction of larger towers – for example wooded areas. A way out offer modular constructed towers, for example hybrid towers which exist of several segments (e.g. concrete and steel) which can be easily transported and assembled.

Advanced Tower Systems (ATS)

One of the world’s largest wind turbines with a hybrid tower is located on the wind testing ground in Grevenbroich. The lower part of the modern tower consist of high, narrow concrete components produced by the Dutch construction specialist Advanced Tower Systems (ATS) and the upper part of conventional steel elements. The turbine in Grevenbroich – the worldwide first with a hybrid tower ATS – has a hub height of 133 metres and a total height of 180 metres. The tower is established and operated by ATS Project Grevenbroich LLC, a cooperation between juwi Network LLC, Mecal Projects LLC, HB Bau LLC as well as Siemens Project venture (SPV).


Further information: www.ats.eu


juwi Energieprojekte GmbH

Energie-Allee 1

55286 Wörrstadt



Tel.+49. (0)6732. 9657- 0

Fax.+49. (0)6732. 9657- 7001


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