The Borssele Alpha and Borssele Beta offshore high-voltage substations are approximately twenty kilometres off the coast of Walcheren and will connect the onshore network to the wind farms that will be built in the Borssele 1-2-3-4-5 areas. Alpha and Beta convert the power supplied by the wind turbines into a high voltage, which is further increased to 380 kV at the receiving station in Borssele for distribution in the national high-voltage grid. Both are being built by HSM Offshore in Schiedam. Sif will deliver the foundation tubes for the jackets for both stations: six per high-voltage substation.