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. This paper deals with a new concept for the conversion of far-offshorewind energy into sustainable fuel. It relies on autonomously sailingenergy ships and manned support tankers. Energy ships arewind-propelled. They generate electricity using water turbinesattached underneath their hull. Since energy ships are notgrid-connected, they include onboard power-to-X plants for storage ofthe produced energy. In the present work, the energy vector ismethanol. The aim of the paper is to propose an energy ship design and toprovide an estimate for its energy performance as function of the windconditions. The energy performance assessment is based on a numericalmodel which is described in the paper. Results show that the windenergy-to-methanol (chemical energy) conversion efficiency is 24 %and that such an energy ship deployed in the North Atlantic Ocean couldproduce approximately 5 GWh per annum of chemical energy(900 t of methanol per annum).

Exploitation of the far-offshore wind energy resource by fleets of energy ships – Part 1: Energy ship design and performance