Senvion Gmbh

Siemens Gamesa Renewable Energy Service Gmbh

Jan Lütjen

Alf Trede

Bernd Schledde

Dennis Thiessen

Frank Maassen

An adapter device for the horizontal preassembly of a wind turbine rotor includes a connection piece on the underside of the adapter device for fastening the adapter device to a tower system of a tower crane, and a rotor flange on the top side of the adapter device for fastening the rotor hub of the wind turbine rotor to be assembled.

Device and arrangement for the horizontal preassembly of a wind turbine rotor

A method for the maintenance of a first wind energy installation from a group of wind energy installations. In the method, a future maintenance time period is identified in which a boost power of the group of wind energy installations is greater than a prescribed threshold value, wherein the boost power results from a wind speed predicted for the future maintenance time period, said wind speed being greater than a rated wind speed. The power of the first wind energy installation is reduced after the start of the maintenance time period and a boost power is drawn from a plurality of wind energy installations from the group of wind energy installations. A maintenance process is carried out at the first wind energy installation. The invention furthermore relates to a control unit suitable for carrying out the method.

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Lütjenwestedt, Germany

Jan Lütjen