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Directory:EnergyTower AB Wind Turbine

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Image:Energytower inside turning 250.jpg

The Energytower is said to be a controlled reproduction of a tornado inside a cylindrical tower.

Commercial delivery planned to begin in 2008.


Official Website


Sales - "Delivery is planned to start in 2008. Until then, specific tests and key customer projects are given priority. Orders may be placed but at this point no guarantees of delivery can be given. As for licenses for research and development, production and/or sales, please contact us with your enquiry."




(5:31 minutes)

EnergyTower - Sveriges Television "Vädrets makter" - Television coverage of the technology. (YouTube November 13, 2007)

How it Works

Image:Energytower top view diagram 250.gif

Air hitting Energytower is led into it and accelerates as the tower's inner radius decreases. Inside the tower, a vertical-axed three-blade rotor starts to rotate. The accelerated air increases pressure and temperature along the inner walls of the tower, generating a relative pressure drop in the middle of the tower – the eye of the tornado. The pressure gap creates a chimney effect in the tower which also adds to the rotation of the rotor. The low pressure in the middle of the whirl enables a fast release of air from the tower whereby new air can be taken in.

Latest Developments

February 8, 2008

This feature page is first posted by Congress:Founder:Sterling D. Allan.


"The vertical orientation of the turbine means that all heavy parts such as mechanical parts, the generator, and other electrical equipment can be placed at ground level. This makes the construction much lighter, and cheaper to manufacture and maintain. The end result is energy production at a competitive cost."


The company cites the following advantages:

low overall cost of energy production.

flexibility with regard to location and application.

environmental and human friendliness.


list here

Independent Testing

list here


list here


Company: Energytower AB

Energytower AB is a Swedish company that develops a new technological platform for wind-based energy production.

Inventor: Eric Stiig
Image:Eric Stiig Energytower 210x300.jpg

Inventor, Eric Stiig stands next to his prototype tower.


In the News

Press coverage index page on company website.

Eric stiigs vindkraftverk fungerar som en tornado (282 KB PDF) - (Nummer 5, 2007)


See Talk:Directory:EnergyTower AB Wind Turbine

Trouble Facing the Wind?

On Feb. 8, 2008, New Energy Congress member, Congress:Founder:Sterling D. Allan wrote:

The primary weakness I would anticipate for this system would be in getting it to turn to face the wind.

Related Technologies

Image:Solar chimney 80.jpg

Directory:Solar Tower - Solar Towers are like an inverted funnel, with a wide skirt to collect air to then turn a turbine in the tower.

Image:Ave artist concept 95x95.jpg

Directory:Michaud Atmospheric Vortex Engine - Louis Michaud's atmosphere vortex engine would harness waste heat from power plants and other heat sources, creating a stationary tornado and capturing the rotational force.


Contact page

Energytower AB

Box 44019

SE-100 73 Stockholm


Energytower AB contact form

Jonas Thurdin

Sales and business development

+46 736630500

Contact form

See also

Directory:Vertical Axis Wind Turbines


- Directory







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