Grid ConnectionUnder the German regulatory regime the responsible transmission system operator has to plan, build and operate the grid connection from the connection point on the wind farm's offshore substation to shore and over land to the grid connection point.
The AC power produced by the Nordsee One wind turbines will be transformed from 33kV to 155kV on the Nordsee One offshore substation. The Nordsee One offshore substation will be connected to the grid via the Dolwin Beta HVDC transmission link. This connection consists of two 155kV AC sea cables of length 7.5km running from the Nordsee One offshore substation to the Dolwind Beta HVDC converter station, where the power will be converted from AC to DC. Then, from the Dolwin Beta HVDC converter station, two 320kV DC sea cables of 45km length and two land cables of 90km length transport the power to the onshore grid connection point at Dörpen-West, where the power will be converted back into AC power and fed into the existing 380kV electricity grid.