Henrik Stiesdal

Siemens Wind Power Division, Chief Technology Officer


1979 – 1988
Studies of medicine, physics and biology at University of Southern Denmark in Odense, Denmark

Professional history

2000 – now
Chief Technology Officer, Bonus Energy / Siemens Wind Power

1988 – 2000
Technical Manager, Bonus Energy

1987 – 1988
Development Specialist, Bonus Energy

1983 – 1986
Project Manager, AS Vestas

1979 – 1983
Licensor / consultant to AS Vestas

1976 – 1983
Wind power pioneer


Awarded the Poul la Cour Prize of the European Wind Energy Association

Siemens Top Innovator

Siemens Inventor of the Year


Stiesdal has been awarded more than 200 patents.


Henrik Stiesdal, 56, is married and has two teenage daughters.

Summary of Business Achievements

Henrik Stiesdal is one of the pioneers of the modern wind industry. He built his first small wind turbine in 1976 and in 1978 designed one of the first wind turbines representing the so-called “Danish Concept” which dominated the global wind industry through the 1980s. In 1979 his design was licensed to A/S Vestas and formed the basis of this company’s rise to become one of the leading wind turbine manufacturers

During his career with Bonus Energy, now Siemens Wind Power Stiesdal has worked with all aspects of wind turbine technology and has also played a major role in the company’s business development.

Among Stiesdal’s achievements with Siemens Wind Power:

Retrofit business

After the California market collapse in 1987 Stiesdal developed and managed the retrofit of competitors’ turbines in the USA. This project essentially secured the company during the “lean years” of the wind industry, 1988-92 when few new products were sold.


In 1990 Stiesdal negotiated and was overall responsible for the world’s first offshore wind farm, including the first offshore optimization of turbines, installed at Vindeby, Denmark in 1991.

Stiesdal later negotiated and was overall responsible for the technical solutions at the ground-breaking offshore wind farms at Middelgrunden (2000) and Nysted (2003); projects that together with Vindeby created the basis for Siemens’ offshore leadership.


From 1993 onwards Stiesdal created the company’s turnkey business in the UK, leading to Siemens’ market dominance in the British wind market.

Blade technology 

From 1995 onwards Stiesdal was responsible for the development of Siemens’ unique IntegralBlade® manufacturing technology, eliminating the weak spots of known technologies. In 1998 Stiesdal set up a combined R&D and pilot production facility, and in 2002 he was responsible for the company’s first full-blown blade manufacturing plant.


In 1996 Stiesdal developed the CombiStall® regulation system, successfully implemented in the company’s megawatt-range turbines until around 2005.

Variable speed    

In 1998 Stiesdal designed the company’s first variable-speed turbine. The technology was tested commercially in 2002 and from 2005 onwards it has been used in all the company’s new products.

Direct Drive

From 1999 onwards Stiesdal was responsible for the development of Siemens’ Direct Drive technology, eliminating the gearbox which is the classical weak spot of traditional wind turbine design.  Based on joint innovation with suppliers the Siemens generator technology has set new standards for low weight and low cost, and the resulting wind turbine has 50% less parts than conventional machines. Direct Drive technology is now the core of Siemens’ future product range.

  • Henrik Stiesdal
  • Siemens Wind Power Division: Chief Technology Officer
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