Green Methanol vs. Synthetic Ammonia: Retrofit Capital Intensity, Toxicity Protocols, and Dual-Fuel Engine Economics
The commercial shipping industry is entering an era of fuel diversification driven by stricter greenhouse gas emission mandates. With the enforcement of the International Maritime Organization's (IMO) revised GHG Strategy targets, the FuelEU Maritime regulation, and the inclusion of shipping in the European Union Emissions Trading System (EU ETS), fleet owners can no longer rely on single-fuel propulsion strategies. Two primary zero/near-zero carbon candidates have emerged for deep-sea merchant vessels: Green Methanol ( / Bio-Methanol) and Synthetic Green Ammonia ( ) . While both offer paths to compliance under regional and global regulations, their operational profiles, retrofit costs, toxicity hazards, and engine mechanics differ significantly. This technical analysis evaluates the engineering complexity, capital expenditure (CapEx), operational expenditure (OpEx), and safety frameworks required to deploy green methanol and synthetic ammonia dual-fuel propulsion sys...