  Renewable fuels of non-biological origin (RFNBOs) are needed to decarbonize
hard-to-electrify sectors that rely on liquid or gaseous fuels, such as
long-haul shipping. The EU's Delegated Act on RFNBOs defines renewable hydrogen
by considering rules on additionality as well as temporal and geographical
correlation of the electricity used. For a Danish case study, we examine the
impact on the capacity expansion problem of an energy hub producing renewable
hydrogen, e-methanol, and e-ammonia using a mixed-integer linear problem
formulation. We analyze the investments in production capacity, storage assets,
and Power Purchase Agreement (PPA) volume under different fuel price
assumptions for 2030. We find that e-methanol (combined with limited storage to
secure hydrogen supply to the synthesizer) provides the best business case with
a PPA volume based on the maximum allowed electrolyzer size.
