The German engineering firm has been overseeing 25 of its SWT-3.6-107 turbines at the wind farm since 2009.
The Rhyl Flats wind farm is located on the eastern end of the Constable Bank between Abergele and Rhos-on-Sea, about 8km off the coast of North Wales.
Te facility, which started operations in December 2009, will generate enough energy for about 61,000 homes per year.
RWE npower renewables purchased the Rhyl Flats project from Celtic Offshore Wind in December 2002.
Apart from the Rhyl Flats facility, RWE is also developing North Hoyle wind farm and the 576MW Gwynt y Môr offshore project.
The three projects will generate enough energy for over 500,000 homes, which is equal to over a third of the total number of homes in Wales.
Siemens Power Generation Services head of wind power and renewables Mark Albenze said: "The Rhyl Flats Wind Farm is one of 12 offshore wind projects Siemens is providing expert service and maintenance for in Great Britain and we are particularly proud that our services continue to make a growing contribution towards the implementation of an environmentally friendly, reliable power supply in the region."
Siemens currently delivers service and maintenance for over 8,700 wind turbines globally, with a combined generating capacity of about 21GW.
Image: Siemens has been overseeing 25 of its SWT-3.6-107 turbines at Rhyl Flats wind farm since 2009. Photo: Courtesy of Siemens AG.
