This would appear to be a safety worry. Are these occurring due maintenance problems are and are more problems occurring due to the age of the turbines.

More information is a major requirement.

DeepResource

In Germany there are 26,500 wind installations (42 GW onshore and 4 GW offshore), with merely 7 accidents per year. Mostly rotor blades broken off or fire after a thunderbolt. Over the last four weeks however no less than four towers fell over. Two towers were 16 and 18 years old. In Saxony a broken rotor blade initiated a chain reaction. The machines are designed to last 20 years.

[spiegel.de] – Experten suchen nach Ursachen für Windrad-Crashs
[n-tv.de] – Windrad knickt um

*** UPDATE *** March 10 2017 – probable cause: failing electronic pitch control. These were all older installations from 1999-2002. The rotor blades were turned out of the wind too late. In another case the sensor was defect. An estimated 1800 turbines of these types are still operational in Germany. Producer: DeWind (D4) and Tacke 1,5 (GE 1,5).

[spiegel.de] – Das Geheimnis…

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