The 161st and final inter-array cable was installed by Reef Subsea's Polar Prince and Polar King vessels.
RWE will now begin working towards commissioning the final 41 turbines of the 160-turbine project in 2015.
The was exported in August 2013 just three months after the . RWE said all offshore construction has taken just under three years to complete.
The in July 2014 and the developer since then has been installing the last of the cables.