The maritime sector is under pressure to decarbonize to meet the International Maritime Organization’s (IMO) 2050 net-zero target, as it currently emits nearly one billion tons of CO2 annually, accounting for 2-3% of global energy-related emissions. While progress has been made in reducing emissions from small vessels through electric and diesel-electric systems, larger ocean-going ships remain a challenge. In 2025, Siemens Energy, Gotlandsbolaget, and Austal developed the Gotland Horizon X, a high-speed catamaran aimed at achieving zero CO2 emissions on routes between Gotland and the Swedish mainland.
The Gotland Horizon X will utilize Siemens Energy’s SGT-400 gas turbines in a combined cycle, achieving close to 50% fuel efficiency. The vessel is designed for multi-fuel capability, allowing future operation on LNG, biofuels, and hydrogen. Gotlandsbolaget aims for fossil-free crossings by 2045, with the Horizon X expected to enter service in 2029, carrying 400 cars and 1,500 passengers at a top speed of 30 knots.
This innovative design emphasizes fuel flexibility and low emissions, with the SGT-400 turbines compliant with IMO’s stringent NOx regulations. The vessel’s hybrid propulsion system offers a scalable model for sustainable maritime transport, potentially transforming long-haul shipping into a low-carbon industry. The introduction of Kongsberg Maritime’s Kamewa S-4L waterjet series further enhances operational efficiency, marking a significant step toward decarbonizing ocean-going vessels.
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