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Outline history of Danish wind turbine production: Output and longevity from 1977 to 2014  

Author:  | Denmark, Technology

The Danish Energy Agency ( has been legally bound responsible for keeping a register since 1977 to maintain an extensive register of all commissioned and decommissioned Danish wind turbines (WT), with a considerable amount of information about every one of them. The register, known as the “Master data register for wind turbines”, collects all its data on an Excel Spreadsheet that is publicly available via the above link. It is updated monthly and by August 2014 included a total of around 7 900 WT’s, of which over 5 300 were non decommissioned (i.e. grid connected) turbines. Of these, 519 are off shore. There are in all ca. 2 600 decommissioned WT’s in the register, all of them on shore. Of the decommissioned WT’s 23 were ≥ 2 MW, while 925 are commissioned. About 7 000 in all were < 2 MW, of these 4 350 were commissioned and 2 660 decommissioned. In this report you will find figures about the (nominal) capacity growth in Denmark to date and especially data on their operation.

… As can be seen from the trend line graph for the periods in question the average operating life of the WT’s declines overtime in parallel to an increase in WT capacity. There is theoretical benefit in increasing WT [capacity] over time as it should reduce the number of sites required to achieve higher levels of output. The real issue however is whether a WT’s output can be increased without decreasing its operational life. It can be clearly seen from the data that as WT’s increase in capacity their operational lives are significantly reduced.

Download original document: “An outline history of Danish wind turbine production: Output and longevity from 1977 to 2014

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