Methanol shipping compliance under FuelEU Maritime and EU ETS

The ocean is vast, but the rules governing the ships that cross it are becoming increasingly specific. For decades, the maritime industry operated on a simple premise: burn fuel, move cargo, and pay for the fuel. Today, that simplicity has vanished, replaced by a complex web of regulations designed to force the industry toward cleaner energy. Three distinct systems now watch every ship's journey. One system, known as the Carbon Intensity Indicator, measures how efficiently a ship moves goods relative to the fuel it burns. A second system, called FuelEU Maritime, sets a strict limit on the total climate-warming pollution generated by the fuel itself, from the moment it is created until it is burned. A third system, the European Union Emissions Trading System, acts like a tax on the carbon dioxide released within European waters. These rules do not speak the same language. They measure different things, cover different distances, and assign different values to the same fuel. For a shipowner trying to decide what to put in their tanks, this creates a confusing landscape where a fuel that looks good on one ledger might look terrible on another.

This confusion is at the heart of a new study by researchers Georgios Makridis and Maria Margarita Separdani from the University of Piraeus. They focused their attention on methanol, a liquid fuel that has recently surged in popularity as a potential solution for greening the shipping industry. Many companies are building new ships designed to run on methanol, betting that it will help them meet future environmental goals. However, the researchers wanted to know if this bet was actually sound. They asked a critical question: does methanol really help reduce pollution, or does its value depend entirely on how it is certified and which specific rulebook is being used to measure it? To find the answer, they did not build a new ship or run a new engine. Instead, they built a detailed accounting framework to separate the different ways methanol is judged under the three major European regulations. They then applied this framework to real data from over 12,000 ships recorded in 2024, creating a clear picture of where the industry stands today and what the future holds.

The first thing the researchers discovered is that not all methanol is created equal. The chemical name is the same, but the story behind the fuel changes everything. The study distinguishes between "grey" methanol, which is made from fossil natural gas, and "green" methanol, which is made from renewable sources like biomass or electricity. Under the strict rules of the FuelEU system, grey methanol performs worse than the traditional heavy fuel oil it is meant to replace. It carries a higher climate-warming footprint from the moment it is produced. In fact, the researchers found that using grey methanol would not only cost more money but would also fail to meet the new pollution limits starting in 2025. It is not a path to decarbonization; it is a dead end. The only version of methanol that offers a genuine advantage is the certified low-carbon kind. If a ship can prove it is using methanol made from renewable energy, the numbers shift dramatically, offering a clear path to compliance.

This distinction leads to a second major finding: the same ship can look very different depending on which rulebook you open. The researchers showed that a ship might appear to be performing well under the efficiency rules of the Carbon Intensity Indicator while simultaneously failing the pollution limits of the FuelEU system. This happens because the two systems measure different things. One looks at how well the ship moves cargo, while the other looks at the total pollution of the fuel itself. A ship could be very efficient at moving cargo but still be using a fuel that is too dirty to pass the FuelEU test. The study proves that you cannot simply add these rules together into one single number. You must look at them separately. If a shipowner relies on a single, blended view of the data, they risk making a costly mistake, thinking they are compliant when they are actually in violation.

The researchers also looked at the financial reality of switching to the clean version of methanol. They calculated the price at which renewable methanol would become a fair deal compared to traditional fuel, considering both the cost of the fuel and the cost of the carbon taxes. Their analysis shows that the price of renewable methanol needs to be significantly lower than current market expectations to make a full switch economically viable. However, there is a middle ground. If a ship does not switch to 100% renewable methanol but instead mixes a small amount of it with traditional fuel, the cost barrier drops much lower. This "minimum blend" approach allows ships to meet the rules without needing a complete overhaul of their fuel supply immediately. The study highlights that the choice between a full switch and a small mix changes the financial math entirely, and the best strategy depends heavily on whether the ship can get a tax break for using renewable fuel.

To understand the scale of the challenge, the team examined the actual emissions data from 12,958 ships recorded in 2024. They found that the total carbon dioxide reported by these ships was nearly 147 million tonnes. When they applied the European Union's carbon tax rules to this data, they estimated that the industry faces an exposure of nearly 4.9 billion euros in 2025 alone. The data revealed that container ships, which carry the world's consumer goods, are responsible for the largest share of these emissions. However, passenger ships and ferries, which often travel short distances within Europe, face the highest intensity of these costs relative to their size. This means that while container ships have the biggest total bill, the passenger sector has the strongest motivation to find a clean fuel solution quickly. The data also showed that public records are not detailed enough to predict exactly how each individual ship will perform under the new rules, but they are perfect for understanding the overall size of the problem.

The study concludes that the promise of methanol is real, but it is conditional. A ship built to run on methanol is not automatically a green ship. It is only a green ship if it can access the specific, certified fuel that the regulations reward. The technology to burn the fuel exists, but the supply chain to provide the clean fuel is the missing piece. The researchers emphasize that the industry must stop treating "methanol" as a single, uniform solution. Instead, it must treat it as a pathway that requires proof. For shipowners, the lesson is clear: do not just buy the engine; buy the fuel and the paperwork that proves it is clean. For the future of shipping, the ability to navigate these separate accounting ledgers will be just as important as the ability to steer the ship itself. The path forward is not about finding a magic fuel, but about understanding the complex rules that determine which fuels are allowed to win.