Cruise Lines International Association (CLIA) has released its annual Environmental Technologies and Practices Report, charting measurable advances in sustainability across the global cruise sector.
Covering data from 2018 through 2024, the report shows major progress in energy efficiency, alternative fuels, and port power connections, reinforcing the industry’s long-term commitment to net-zero emissions.
Fleet adopting alternative fuels and flexible engines
The report highlights the growth of multi-fuel ships, rising from just one in 2018 to 19 today, with 23 expected in service by the end of 2025. By 2036, a further 32 dual-fuel ships are planned, including vessels capable of running on methanol and LNG. Cruise lines are also actively testing biofuels and preparing to scale zero- and near-zero emission fuels.
Expanding onshore power connectivity
One of the clearest areas of progress is onshore power supply. In 2018, only 25 per cent of CLIA-member ships could plug in at port. Today, 166 ships representing 65 per cent of global cruise capacity have OPS capability, allowing engines to be shut off in port and reducing emissions by up to 98 per cent. By 2036, nearly 90 per cent of the CLIA-member fleet is expected to have this connectivity.
A growing fleet with a greener profile
As of August 2025, CLIA’s 45 member lines operate 310 oceangoing ships, with most being small and mid-size vessels. More than 80 new ships are currently on order worldwide, all featuring the latest efficiency and sustainability innovations. CLIA President and CEO Bud Darr said the industry was “investing tens of billions to build the fleet of the future,” setting new standards for maritime technology and environmental performance.
