Sylvie Willis
Container ship fuel consumption is a highly relevant topic, given the environmental impact of the shipping industry. The amount of fuel consumed by container ships varies based on the size of the ship, its speed, and the route. For example, an Ultra Large Container Vessel (ULCV) with a capacity of 10,000+ TEUs can burn between 150 and 200 tons of fuel per day, while a Panamax ship consumes about 63,000 gallons of fuel per day. The Emma Maersk, a large container ship, burns 312 tons of fuel per day, or over 84,000 gallons. Shipping companies have adopted slow steaming to reduce fuel consumption, but this has trade-offs in terms of longer shipping times and the need for more ships. As the shipping industry moves towards a greener future, innovations in zero-emission fuels, wind propulsion, and other decarbonization methods are being explored to reduce the environmental footprint of these vessels.
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What You'll Learn
Container ship fuel capacity varies
Ultra-large container ships (18,000+ TEUs) carry significantly more fuel (e.g. 4.5 million gallons) than Panamax ships (up to 5,000 TEUs), which can hold between 1.5 and 2 million gallons. Post-Panamax ships (8,000-14,000 TEUs) typically carry 2.5-3.5 million gallons of fuel. The CMA CGM Benjamin Franklin, one of the largest container ships to call on the U.S., carries approximately 4.5 million gallons of fuel oil.
The Emma Maersk, another large container ship, can burn 312 tonnes of heavy fuel oil per day, or more than 84,200 gallons, when operating at 85% of its maximum power. A Panamax container ship can consume 63,000 gallons of marine fuel per day at a speed of 20-25 knots.
To reduce fuel consumption, maritime shipping companies have adopted slow steaming practices, which involve operating at slower speeds (19 mph or 19-22 knots) and can reduce fuel use by up to one-third. However, this may require more ships or longer shipping times to maintain schedules.
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Fuel consumption and speed
The fuel consumption of container ships depends on various factors, including the size of the ship, the speed at which it travels, the weight of the ship, and the engine capacity.
The speed at which a container ship travels has a significant impact on its fuel consumption. For example, a Panamax container ship can consume 63,000 gallons of marine fuel per day when travelling at top speeds of 20 to 25 knots per hour (23 to 28 miles per hour). However, by reducing its speed by just 10%, the ship can decrease its fuel consumption by almost a third. This strategy, known as "slow steaming," has been adopted by maritime shipping companies to reduce fuel costs and lower emissions. While slow steaming can lead to significant fuel savings, it may require more ships or longer shipping times to maintain schedules.
The relationship between speed and fuel consumption is not linear. Doubling a ship's speed requires eight times more engine power due to the relationship between speed and drag, which results in increased fuel consumption. For example, a containership consuming 150 tons of bunker fuel per day at 21 knots will consume about 225 tons per day at 24 knots, a 33% decline in fuel efficiency.
The size of the container ship also plays a role in fuel consumption. Ultra-large container ships (18,000+ TEUs) have higher fuel consumption, typically carrying 4.5 million gallons of fuel, compared to Panamax ships (up to 5,000 TEUs), which carry 1.5 to 2 million gallons. Larger ships, such as the Emma Maersk, with a capacity of 14,000 TEUs, can burn up to 312 tonnes of heavy fuel oil per day at normal operating conditions.
To put the fuel consumption of container ships into perspective, a single ship can use between 63 and 200 tonnes of fuel per day, with some of the largest ships consuming over 80,000 gallons of fuel per day. This fuel consumption results in significant emissions, equivalent to hundreds of cars operating for an entire year.
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Slow steaming
A Panamax container ship can consume 63,000 gallons of marine fuel per day at 24 knots. When the speed is reduced by 10%, the fuel consumption drops to around 44,100 gallons per day, a 30% decrease in engine power. This also results in a 30% reduction in emissions, which is a significant environmental benefit.
There are two types of slow steaming. The first and most common method does not require any changes to the ship's engine. The second type involves a significant reduction in speed, towards 12 knots, and is rarely applied. This very slow steaming may require additional provisions to be put in place.
While slow steaming can be beneficial, there are also some drawbacks. The ship's engine and propeller are designed to operate within a certain RPM range, so steaming too slowly may place the engine outside of its most efficient range. This can cause issues with the turbochargers, leading to a reduction in airflow and potential for more carbon deposits. There are also time-dependent costs, such as increased crew wages and charter rates, due to the longer voyage duration.
Overall, slow steaming is a strategy that can help reduce fuel consumption and emissions for container ships. However, it must be balanced with the potential drawbacks and increased costs associated with longer voyage times.
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Fuel consumption by ship size
The amount of fuel consumed by a container ship depends on several factors, including its size, speed, weight, and engine capacity. Larger ships generally consume more fuel, with Ultra Large Container Vessels (ULCVs) burning 150–200 tons of fuel per day. Panamax ships, which can carry up to 5,000 twenty-foot equivalent units (TEUs), consume around 63,000 gallons of fuel per day at top speeds. At normal operating conditions, the Emma Maersk, which can carry 14,000 TEU, burns 312 tons of fuel per day.
Post-Panamax or New Panamax ships, with a capacity of 8,000–14,000 TEUs, typically carry 2.5–3.5 million gallons of fuel. Ultra-large container ships (18,000+ TEUs) carry significantly more fuel, up to 4.5 million gallons. The CMA CGM Benjamin Franklin, one of the largest container ships to call on the US, can carry approximately 4.5 million gallons of fuel oil.
The speed of a container ship also significantly impacts its fuel consumption. For example, a ship travelling at 24 knots might consume 50% more fuel than when travelling at 20 knots. Slow steaming, or operating engines below capacity, can reduce fuel consumption but may require more ships or longer travel times. Extra slow steaming (15–18 knots) can achieve minimal fuel consumption while still maintaining a commercial service.
Other factors influencing fuel consumption include the ship's draft and displacement, weather force and direction, hull and propeller roughness, seawater temperature, and wave height. Optimizing fuel consumption is critical due to increasing fuel prices and the need to reduce emissions.
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Innovations in zero-emission fuels
The amount of fuel consumed by container ships varies depending on the ship's size, speed, weight, and route. For instance, a Panamax container ship can consume 63,000 gallons of marine fuel per day at top speeds of 20 to 25 knots per hour. On the other hand, Ultra Large Container Vessels (ULCV) can consume 150-200 tons of fuel per day or even more.
While shipping goods by sea is more efficient than other forms of transport, there is a pressing need to reduce the environmental footprint of ships. To achieve net-zero shipping by or around 2050, the International Maritime Organization (IMO) is targeting the use of zero-emission fuels. Here are some innovations in zero-emission fuels and related infrastructure:
Green Hydrogen and Synthetic Fuels
Green hydrogen-based fuels, such as e-methanol and e-ammonia, are at the forefront of zero-emission maritime shipping. These fuels are produced by powering electrolysis with renewable energy, offering an 80-100% reduction in shipping emissions. Industry pioneers like Copenhagen Infrastructure Partners are investing heavily in renewable energy projects to scale up the production of green ammonia.
Port Readiness Level Tools
The Zero-Emission Shipping Mission has introduced a Port Readiness Level (PRL) web-based tool to help ports and port authorities assess their capacity to support alternative fuels. This tool is designed to facilitate the transition to zero-emission bunkering at ports, aligning with the IMO's target of at least 5% use of zero-emission fuels by 2030.
Biofuels and Green Methanol-Ammonia Bunkering
The Global Maritime Forum and RMI, under the Mission Innovation umbrella, are leading the way in exploring biofuels as pilot fuels in methanol and ammonia engines. Their work includes a study on the availability of biofuels at global ports, with a focus on enabling the production of heavy fuel oil equivalent (HFOe) well-to-wake zero-emission fuels.
Wind Propulsion
Wind-powered cargo ships are another innovative approach to zero-carbon shipping. For instance, the maritime company Cargill has leased a freighter equipped with UK-engineered rigid sails called WindWings. By harnessing wind energy, this technology boosts fuel economy and reduces carbon dioxide emissions, offering a cost-neutral and environmentally friendly solution.
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Frequently asked questions
A container ship's fuel consumption depends on its size and speed. A Panamax container ship consumes 63,000 gallons of marine fuel per day at 20-25 knots per hour. An Ultra-Large Container Vessel (ULCV) with a capacity of 10,000+ TEUs can consume 150-200 tons of fuel per day. The Emma Maersk, a large container ship, consumes 312 tons of fuel per day.
A ship travelling at 24 knots might consume 50% more fuel than at 20 knots. At 21 knots, a container ship's fuel consumption drops to about 150 tons per day, a 33% decline.
Slow steaming is the practice of operating ships at slower speeds to reduce fuel consumption. During the financial crisis of 2008-2009, maritime shipping companies adopted slow steaming to accommodate additional ships with a similar frequency of port calls.
In addition to slow steaming, innovations in zero-emission fuels, wind propulsion, and other maritime decarbonization methods are helping to reduce the environmental footprint of container ships. For example, the use of WindWings sails can lower fuel usage and carbon dioxide emissions.
