that, under the assumptions above and in Annex I, LNG Maritime-compliant vessel. Ammonia costs reach parity with those of LNG by around 2044, while the methanol year. However, considered across the whole period 2025- 2050, LNG remains the least expensive option; around From the modelling above, it is evident that the methane under the IMO Net Zero Framework, with related costs starting in the second year of the regime, For both ammonia and methanol pathways,IMO penalties only Net Zero Framework's adoption was postponed.