Vattenfall is seeking a company to carry out maintenance at the 288MW Dan Tysk offshore wind farm in the German North Sea.
The scheduled maintenance work would kick off on 1 June next year and run for 13 months, according to the tender document.
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It will include provision of maintenance, all consumables, spare parts, tools, data and documentation, as well as logistics and accommodation.
Interested parties have until 3 July to apply.
Dan Tysk features 80 Siemens Gamesa 3.6-120 turbines and has been fully operational since April 2015.
The tender document said 54 turbines would covered by the work in 2021 and all 80 in 2021.