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Conference programme 

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Poster session

Lead Session Chair:
Stephan Barth, Managing Director, ForWind - Center for Wind Energy Research, Germany
Ederer Nikolaus Strabag OW EVS GmbH, Germany
Ederer Nikolaus (1) F P
(1) Strabag OW EVS GmbH, Hamburg, Germany (2) Vienna University of Technology, Vienna, Austria

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Presenter's biography

Biographies are supplied directly by presenters at OFFSHORE 2015 and are published here unedited

Nikolaus Ederer studied Industrial Engineering and Business Administration with a focus on energy and environmental management. Since a study visit at the Technical University of Denmark he is fascinated by wind energy. He is currently working for Strabag OW EVS GmbH, a German offshore wind project development company, where he is mainly responsible for layout optimization, energy yield assessment as well as cost and revenue appraisal for their future offshore wind farms. Besides that he is writing scientific articles for his PhD study on the subject of “Applied Offshore Wind Economics”.


The right size matters: investigating the offshore wind turbine market equilibrium


This paper is already published in the renowned ENERGY Journal:

Nikolaus Ederer, The right size matters: Investigating the offshore wind turbine market equilibrium, Energy, Volume 68, 15 April 2014, Pages 910-921, ISSN 0360-5442,



Main body of abstract

Although early experiences indicate that the maturity of deployed technology might not be sufficient for operating wind farms in large scale far away from shore, the rapid development of offshore wind energy is in full progress. Driven by the demand of customers and the pressure to keep pace with competitors, offshore wind turbine manufacturers continuously develop larger wind turbines instead of improving the present ones which would ensure reliability in harsh offshore environment. Pursuing the logic of larger turbines generating higher energy yield and therefore achieving higher efficiency, this trend is also supported by governmental subsidies under the expectation to bring down the cost of electricity from offshore wind. The aim of this article is to demonstrate that primarily due to the limited wind resource upscaling offshore wind turbines beyond the size of 10 MW (megawatt) is not reasonable. Applying the planning methodology of an offshore wind project developer to a case study wind farm in the German North Sea and assessing energy yield, lifetime project profitability and levelized cost of electricity substantiate this thesis. This is highly interesting for all stakeholders in the offshore wind industry and questions current subsidy policies supporting projects for developing turbines up to 20 MW.



Learning objectives
- State-of-the-art offshore wind planning and turbine selection methodology is presented.
- Energy yield, profitability (IRR) and LCOE for 3–20 MW turbines are evaluated.
- Upscaling of offshore wind turbines is likely to stop due to limited wind resource.
- Results indicate a market equilibrium for 10 MW offshore wind turbines.
- Installed capacity resp. energy yield per km2 is flattening with increasing turbine size.