Abstract
Large-scale development of offshore wind power is needed to fulfil Europe's future electricity needs and for reducing emissions from the electricity sector. Grid connection is a critical factor that should be regarded in accordance with the need for increased transnational power exchange to avoid sub-optimal offshore grid developments. This paper presents a methodology for identifying an optimum offshore grid structure, taking into account wind variations, price variations, power demand at oil rigs, and possible connection points to the onshore power system. The applicability of the method is demonstrated by a case study of offshore wind power development in Norway.