South Africa’s abundant renewable energy resources, strategic maritime location, and comprehensive port system position it to become a global supplier of alternative marine fuels. Marine fuel - a key downstream opportunity for the country’s green hydrogen ambition - can unlock an additional 2-million-metric-ton hydrogen market, creating local value. The document presents a demand analysis for the supply of hydrogen-based marine fuels at South Africa’s commercial ports and a detailed case study for the Port of Saldanha. The case study evaluates the feasibility of a candidate large-scale investment project to produce zero carbon ammonia, aimed at reducing ship emissions. The report also details financial-, policy- and infrastructure solutions essential for establishing a market for green marine fuels in South Africa.