What Will Ship Fuel Be Replaced With? Future Fuels Explained

The global shipping industry is at a turning point and for decades, vessels have relied on heavy fuel oil and marine diesel to power operations. These fuels are cheap, energy-dense, and widely available, but they are also highly polluting. As environmental regulations tighten and pressure mounts to reduce emissions, the question is no longer if ship fuel will be replaced, but what it will be replaced with. 

In this latest Martide blog post, we explore why alternative fuels are necessary, what options are emerging, and what the future of ship fueling may look like. 

Why Ships Need New Fuel Sources 

Shipping currently accounts for around 3 percent of global greenhouse gas emissions, a figure that could rise significantly without intervention. 

The International Maritime Organization (IMO) has set ambitious targets to reduce emissions, aiming for net-zero shipping by around 2050. 

Traditional fossil fuels alone cannot meet these goals. Even with improved ship efficiency, the scale of global trade means emissions will remain too high and this is why the industry is focusing on alternative fuels that produce fewer or zero emissions. 

There are several key drivers behind this shift: 

• Environmental regulations and emissions targets 

• Rising fuel costs and long-term sustainability concerns 

• Pressure from customers and investors for greener supply chains 

• Technological advancements in fuel and propulsion systems 

The Leading Alternatives to Traditional Ship Fuel 

There is no single fuel that will replace marine fuel oil overnight; instead, the future is likely to involve a mix of different energy sources, depending on vessel type, route, and infrastructure. Here we take a look at some of the options. 

1. Green Methanol 

Methanol is one of the most advanced alternative fuels currently in use. It can be produced from renewable sources and burns cleaner than traditional fuels. 

• Already being used in commercial vessels 

• Easier to store and handle compared to some alternatives 

• Can reduce emissions significantly when produced sustainably 

For example, container ships capable of running on methanol are already entering service, signaling real progress toward adoption. On the downside, though, methanol still produces some emissions and depends on large-scale green production to be fully sustainable. 

2. Ammonia 

Ammonia is widely seen as a strong candidate for the future of shipping fuel. 

• Contains no carbon, so it produces no CO2 when burned 

• High energy density compared to hydrogen 

• Can be used in combustion engines or fuel cells 

Green ammonia, produced using renewable energy, is considered a “zero-emission” fuel pathway. Having said that, challenges remain, including toxicity and the need for new safety standards and infrastructure. 

3. Hydrogen 

Hydrogen is another key contender, particularly for zero-emission shipping. 

• Produces only water when used in fuel cells 

• Can be generated from renewable energy (green hydrogen) 

• Plays a central role in future energy systems 

Hydrogen and its derivatives could reduce shipping emissions by up to 80 to 100 percent. However, hydrogen is difficult to store and transport due to its low energy density, which makes it more suitable for shorter routes or specialized vessels. 

4. Liquefied Natural Gas (LNG) 

LNG is often considered a transitional fuel rather than a long-term solution. 

• Produces fewer emissions than heavy fuel oil 

• Already widely available and used in modern vessels 

• Requires relatively minor changes compared to other fuels 

The downside is that LNG is still a fossil fuel and does not eliminate emissions completely with many experts believing it will play a temporary role while cleaner fuels scale up. 

Read more:  Everything You Need to Know About LNG and LPG Tankers 

5. Biofuels 

Biofuels are derived from organic materials such as plant waste or algae. 

• Can be used in existing engines with minimal modification 

• Lower carbon footprint compared to fossil fuels 

• Scalable in the short term 

The main challenge is ensuring sustainable production without competing with food supply or causing environmental damage. 

6. Hybrid and Electric Solutions 

For short-distance shipping, electrification and hybrid systems are also emerging. 

• Battery-powered vessels for ferries and coastal routes 

• Hybrid systems combining fuel and electric propulsion 

• Reduced emissions in port and nearshore operations 

Fully electric solutions are unlikely to power large ocean-going vessels due to energy limitations, but they will play an important role in certain segments. 

What Will the Future of Ship Fuels Look Like? 

The future of ship fueling will not rely on a single solution. Instead, it will be a combination of fuels and technologies tailored to different needs. 

Likely Fuel Mix by Vessel Type 

Vessel Type	Likely Future Fuel Options
Short-sea shipping	Batteries, hydrogen
Cruise ships	Methanol, LNG, hybrid systems
Container ships	Methanol, ammonia
Bulk carriers	Ammonia, biofuels
Tankers	Ammonia, hydrogen derivatives

Shipping companies are already investing in dual-fuel vessels that can run on both traditional and alternative fuels and this allows for flexibility as the industry transitions. 

Key Ship Fuel Challenges to Overcome 

While the direction is clear, the transition is not simple. 

Infrastructure 

Ports around the world need new bunkering systems for alternative fuels, requiring significant investment and global coordination. 

Cost 

Green fuels such as hydrogen and ammonia are currently more expensive than traditional fuels although prices are expected to fall as production scales up. 

Safety 

Some fuels, especially ammonia and hydrogen, come with safety concerns that require new regulations and crew training. 

Availability 

Large-scale production of green fuels is still limited: the industry must build supply chains capable of supporting global shipping demand. 

The Role of Regulation and Industry Collaboration 

Regulation will play a major role in shaping the future of ship fuel. 

The IMO and regional bodies are introducing measures to limit emissions and encourage the adoption of cleaner fuels. These include: 

• Emissions targets and carbon intensity limits 

• Potential carbon pricing mechanisms 

• Incentives for low-emission vessels 

At the same time, collaboration between shipowners, fuel producers, and ports is essential to create “green shipping corridors” where alternative fuels are available and supported.  

Ship Fuels of the Future: Conclusion 

Ship fuel will not be replaced by a single alternative, but by a combination of cleaner energy sources. Methanol, ammonia, hydrogen, and biofuels are all likely to play important roles, supported by hybrid and electric technologies in certain sectors. 

The transition is being driven by environmental necessity, regulatory pressure, and technological innovation. While challenges remain, the direction is clear: the future of shipping will be powered by low and zero-emission fuels. 

For maritime professionals and seafarers, this shift will bring new skills, new systems, and new opportunities. Understanding these changes now will be key to staying ahead in a rapidly evolving industry.