With a growing focus on mitigating climate change and progressing toward the International Maritime Organization’s (IMO) 2050 net-zero target, the marine sector is under intense pressure to decarbonize. Today, maritime transport emits
With a growing focus on mitigating climate change and progressing toward the International Maritime Organization’s (IMO) 2050 net-zero target, the marine sector is under intense pressure to decarbonize. Today, maritime transport emits nearly one billion tons of CO2 annually, representing roughly 2-3% of all energy-related carbon emissions worldwide .
Substantial progress has been made over the past decade in reducing emissions from small commercial and coastal vessels via all-electric and diesel-electric propulsion (DEP) systems. However, decarbonizing larger ocean-going and cargo-carrying ships that travel hundreds or even thousands of miles between stops has proved more difficult.
In 2025, Siemens Energy, Swedish ferry line operator Gotlandsbolaget, and Australian-based global shipbuilding company, Austal, took a significant step forward in addressing this challenge with the development of the Gotland Horizon X: a high-speed catamaran that aims to provide zero CO2 emissions crossing between the island of Gotland and the Swedish mainland.
The vessel will feature Siemens Energy’s SGT-400 high-efficiency gas turbines in a combined cycle configuration. The gas and steam turbines will drive Kongsberg water jets and provide the ferry’s electrical loads via power take-offs (PTOs) on the main gearbox.
The vessel will operate with a fuel efficiency of close to 50% – significantly
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