JDR will provide the 70 kilometres worth of aluminum core cables for the project located 40 kilometres off the German coast in the North Sea.
The cables, which will connect projects turbines, will be manufactured at JDR's Hartlepool facility in the UK.
Developer RWE Innogy has been forced to open a new turbine tender after a fault with the previously planned Senvion 6.15MW turbines was found, which would not have been corrected before the planned start of construction.
JDR will also provide field service teams to help the installation and testing of the cables.
Siem was handed the cable installation contract by the German developer RWE in April. The wind farm is due to be fully operational in 2016.