The marine pleasure industry is entering a period where regulation and technology are increasingly working together. Hybrid propulsion, batteries, alternative fuels and fuel cells are moving from experimental projects into real vessels, while new regulations are creating stronger incentives to reduce emissions and improve efficiency.
Regulation as a technology driver. The IMO (International Maritime Organization) has already introduced measures such as the Energy Efficiency Existing Ship Index (EEXI) and Carbon Intensity Indicator (CII). Since 2023, applicable vessels must meet energy-efficiency requirements and larger ships must monitor their annual carbon intensity.
Europe is putting further pressure on the market. Maritime transport entered the EU Emissions Trading System (EU ETS) in 2024, increasing the financial cost of greenhouse-gas emissions. FuelEU Maritime, effective in 2025, progressively reduces the greenhouse-gas intensity of energy used by ships above 5,000 GT calling at EU ports.
These regulations do not prescribe one specific technology. Instead, they encourage operators and manufacturers to find the most efficient combination of propulsion, fuels and energy-management systems.
Hybrid propulsion moves into production. Hybrid systems are becoming one of the most practical solutions. Combining diesel engines, electric motors and batteries allows vessels to select the most efficient operating mode depending on speed and operating conditions.
Sanlorenzo’s new SHE is a good example. The 25.5-meter yacht combines two Volvo Penta D13 engines with two 160 kW electric motors. It can reach 20 knots while also operating in fully electric mode at lower speeds.
Volvo Penta is also expanding its IPS hybrid platform, integrating electric propulsion, conventional engines and energy management into a single system.
Methanol and fuel cells. Alternative fuels are also moving closer to commercial applications.
Sanlorenzo’s 50Steel uses a green-methanol fuel-cell system that converts methanol into hydrogen and then electricity. The system can provide up to 100 kW for hotel loads without running the main engines or generators.
Sanlorenzo is also developing the 50 X-Space with MAN around methanol-fueled propulsion, demonstrating that methanol could have applications beyond onboard electricity generation.
Hydrogen remains a longer-term option. Hydrogen offers significant potential for reducing emissions, but storage, infrastructure and cost remain challenges.
The Bluegame BGH-HSV, developed for America’s Cup applications, demonstrates how hydrogen technology can already be used in high-performance marine applications. Larger commercial vessels may eventually use hydrogen or hydrogen-derived fuels as part of a broader energy strategy.
Efficiency starts with the hull. Cleaner propulsion is not only about engines and fuels. Lightweight materials, improved hull designs, foiling systems and technologies such as Hull Vane can reduce the energy required to move a vessel.
This means future efficiency will come from the combination of hull design, propulsion, energy storage and intelligent energy management.
What comes next? Not every vessel is subject to the same regulations. IMO and EU requirements primarily target commercial shipping and defined categories of larger vessels, while private recreational craft follow a different regulatory framework.
Nevertheless, the direction of travel is clear. The marine industry is moving towards a combination of hybrid propulsion, batteries, lower-carbon fuels, methanol, hydrogen, fuel cells and more efficient hulls.
There is unlikely to be one single replacement for the diesel engine. Instead, the next generation of vessels will combine several technologies to use energy more efficiently—and regulation will continue to accelerate that transition. PSR
Natasa Mulahalilov is Marine Pleasure Boat Analyst
