Tech Facts

Windside wind turbines are manufactured and designed according to high Windside standards. Only highest quality components are chosen for the manufacturing process. Every unit is made carefully and tested at our factory.

The reliability and quality of the Windside wind turbines does not derive only from the high-grade materials but also from the experienced engineering work. Windside Quality is the result of 30 year's hard work and experience.

Windside wind turbines are made to last. The strongest model can withstand constant winds up to 60 m/s. Windside wind turbines can be found in the following wind endurance classes:

A model
60 m/s
Bplus model 50 m/s
B model 40 m/s

Power Production

Thanks to Windside's unique design and unparallelled engineering work Windside wind turbines are probably the most efficient wind turbines in the world. How is this possible?

  • Windside wind turbines have an abiliy to take advantage of even the lowest wind speeds (1-3 m/s).
  • The wind direction is not a significant factor for Windside, since the wind catches the spiral-shaped vanes always from the right angle.
  • Windside will carry on generating at wind speeds of 40 ms, 50 m/s or 60 m/s depending on the model.
  • Windside efficieny curve is across a very wide range of wind speeds.

KWh production

We at Windside belive that the energy production should be informed in kWh/year basis and this production figure should be based on measurements done in real life circumstances.

Commonly used maximum rated power has very little to do with real life results and therefore it is important to find out how many kWh the turbine is like to produce on annual basis at different wind speeds.

We at Windside want to be honest with our customers and we use real life measurements when informing the expected annual output of the turbines. Please see below


Annual kWh output at average wind speed of 5 m/s
Annual kWh output at average wind speed of 7,5 m/s
Annual kWh output at average wind speed of 10 m/s
WS-0,15 range
WS-0,30 range 80
WS-2 range 700
WS-4 range 2000
WS-12 8640


The table above is an estimation based of real life measurements at less than 5 m/s average wind speed. It is challenging to say in advance how much energy the turbine can produce since there are several factors affecting the production. Things like wind speed, installation place, height of the mast, surrounding buildings and trees, turbulence, air density and wind shear.

Two WS-12 producing power for heating up water at the "Mylly" shopping centre in Raisio, Finland.


Product testing

Mechanical durability and torques of the new wind turbine were tested with the WS-0,30 model in the Finnish Technical Research Centre in the year 1981. In the year 1988 the same research centre tested the wind turbine again in its ship laboratory and a little later in its engine laboratory. Windside itself tested the turbine in Åland with an electric motor. At the same time, in 1989-91 the Finnish Army tested WS-4 turbine in the archipelago of Finland. The test lasted continuously 450 days. During this time the energy production was measured with the help of a computer, giving 8 values per second.

An example of computer measuring in the archipelago of Finland in 1989-1991

Generator production in Ah with different wind velocities in the Finnish coast, autumn 1989 - spring 1991. The measuring proves that Windside Wind Turbines produce energy at least 157 days more per year than the conventional horizontal propeller types.

Already in the tests made in 1981 it was discovered that the vanes of the Windside turbine do not freeze while rotating. A customer, who uses the WS-0,15 model continuously in Utsjoki, Lappland, made the same discovery in the winter 1993-94: the vanes do not gather snow or ice while rotating, even in conditions in which all the other turbines freeze.

Despite the excellent testing results, the strongest qualities of the turbine were discovered in the actual production usage. The strongest advantage of Windside lies in its ability to take advantage of even the lowest wind speeds. The electricity production of Windside begins even with the wind speeds as low as 2-3 m/s, and the bigger the turbine is, the lower wind speed it requires to start. According to measured results, the 3 m/s winds blew during 100 days per year in inland areas. The propeller models based on the traditional aeroplane engineering cannot take advantage of these light winds, usually their production begins at wind speeds of 4-5 m/s, from moving wind. The wind direction is not a significant factor for Windside, either, since the wind catches the spiral-shaped vanes always from the right angle. No automatic, easily broken turning mechanisms are needed.

The studies made in the archipelago show that The Windside Wind Turbine produces a minimum 30-50 % more electricity per year than other wind turbines with the same swept area. Windside’s efficiency is better, when the wind speed is under 5 m/s. Furthermore, its vertical turbine is able to take advantage of all winds, while stormy winds and the changes in wind direction and turbulence significantly diminish the efficiency of the traditional models.