Cables for the Kentish Flats Extension project will start load out onto the vessels in Nordenham in Germany on 1 May.
The vessels BoDo Installer and Nostag 10 will transport the cables to the Kentish Flats Extension site where they will begin laying the cables later that month.
Manufacturing of the cables was carried out ahead of schedule.
The Kentish Flats Extension is located adjacent to the Kentish Flats Offshore Wind Farm.
The Kentish Flats Extension will have a maximum capacity of 49.5MW and will comprise of 15 turbines. The extension itself will be capable of generating up to 173,000 megawatt hours (MWh) of clean electricity every year, which is equivalent to the total annual electricity needs of up to 35,000 UK households.