  Massive investments in offshore wind power generate significant challenges on
how this electricity will be integrated in the incumbent energy systems. In
this context, green hydrogen produced by offshore wind, emerges as a promising
solution to remove barriers towards a carbon-free economy in Europe and beyond.
Motivated by the recent developments in Denmark with the decision to construct
the first Offshore Energy Hub in the North Sea, this paper investigates how we
can achieve the lowest production cost for green hydrogen. Taking a holistic
approach, we consider the integrated co-design of the hydrogen and offshore
electricity infrastructure, explore the synergies, and determine the levelized
costs of both hydrogen and electricity. We investigate alternative electrolyser
placements, technologies, and modes of operation. We find that producing
hydrogen offshore reduces the levelized cost of electricity and achieves the
lowest cost for hydrogen, competitive with the hydrogen costs currently
produced by natural gas.
