Yet the 10,200-tonne HelWinbèta topsides is the fourth of ten giant converter stations being delivered one by one for transmission system operator (TSO) TenneT’s pioneering plan of plugging in more than seven million homes to wind projects now being developed in the German North Sea.

Its size squares with the TSO’s wider ambition. HelWinbèta — which is 98 metres long, 42 metres wide and 28 metres tall — will be the heart of the 690MW high-voltage direct-current (HVDC) HelWin2 transmission hub.