The cables have been buried in the seabed between the platforms 16 kilometres off the coast of north Wales and the Pensarn beach in Conwy county.
The EUR 2 billion project, a joint venture between RWE Innogy (60%), Stadtwerke München (30%) and Siemens (10%), is one of the largest offshore wind farms currently in construction in Europe. Power will be generated by 160 3.6MW Siemens turbines, which are due to be fully operational in late 2014.
"The completion of export cable burial is an important stage in the construction of the wind farm," said project director Toby Edmonds.
"In addition, progress on monopile and transition piece installation has been excellent, with 80 locations complete with full foundations and another 25 with just a monopile," he said.
RWE started construction of the project in January last year. In 2011, it signed a deal to build an offshore facility at the Port of Mostyn, north Wales, as part of its plan to develop the project.
It also signed a three-year £5 million (EUR 5.8 million) contract with Cammell Laird Shipyard to provide port and quayside facilties, and to load and fit out the foundations of the offshore wind turbines.