AWJ Marine is conducting blade maintenance operations at the 576MW Gwynt y Mor wind farm in the Irish Sea.
Works are being carried out across 40 of the 160 Siemens SWT-3.6-107 turbines, which have a capacity of 3.6MW each.
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Activities will take place between April and September this year and will be carried out by technicians working from the NR Panther crew transfer vessel.
Gywnt y Mor was commissioned in 2015 and is located 14km off the north Wales coast.