COPENHAGEN — For more than a century, the global shipping industry has moved about 11 billion tons of cargo annually, and the engine room of that enterprise runs almost exclusively on diesel. According to industry data as of 2020, diesel engines power over 90% of the world’s freight shipping fleet, including the container ships, tankers, and bulk carriers that ply the major trade routes. The dominance of the diesel engine in maritime transport is not a recent development.
The first diesel-powered ship, the tanker MS Selandia, was launched in 1912 in Copenhagen, Denmark. Built by the firm Burmeister & Wain, the Selandia demonstrated the viability of Rudolf Diesel’s invention for heavy marine propulsion.
That technological leap set the standard for the century that followed. Diesel’s reign extends beyond the ocean. In the United States, diesel locomotives powered by EMD (Electro-Motive Division) engines became the standard after World War II, replacing steam locomotives by the 1950s.
The same fuel that drives container ships across the Pacific also moves freight trains across the American heartland. The record shows that the shift from steam to diesel was a strategic decision driven by efficiency and power.
The strategic context is clear. The global shipping industry, which moves about 11 billion tons of cargo annually according to 2020 estimates, depends on diesel’s combination of power and fuel efficiency. No other fuel source has matched its performance for large-scale ocean transport.
For nations that rely on maritime trade—and that includes nearly every economy—the diesel engine is the backbone of supply chains.
The Diesel Era: From Copenhagen to Global Routes
The launch of the MS Selandia in 1912 marked a turning point in maritime history. Built in Copenhagen by Burmeister & Wain, the tanker was the first ocean-going vessel to be powered solely by a diesel engine. At the time, steam engines were the standard.
The Selandia proved that diesel could deliver reliable power while consuming less fuel and requiring less crew for boiler operation. According to historical records, the Selandia’s success opened the door for the gradual adoption of diesel engines in commercial shipping.
By the mid-20th century, diesel had become the dominant power source for new vessels. The tanker’s legacy is evident today in every container ship that crosses the oceans. The shift to diesel was not limited to ships.
In the United States, the Electro-Motive Division of General Motors developed the diesel locomotives that would replace steam engines after World War II. By the 1950s, diesel locomotives had become standard on American railroads.
The same basic technology—a diesel engine driving an electric generator—powers both locomotives and many modern ships. For the global shipping industry, diesel’s advantages are straightforward. The fuel has a high energy density, meaning ships can carry enough fuel for long voyages without sacrificing cargo space.
Diesel engines are also durable and reliable, capable of running continuously for weeks at a time. These characteristics have made diesel the fuel of choice for the vast majority of the world’s freight fleet.
Geopolitical and Economic Implications
The dependence on diesel engines has strategic implications for global trade. Nations that control diesel fuel supplies or the technology to build efficient engines hold significant leverage over maritime commerce. The record shows that the shipping industry moves about 11 billion tons of cargo annually, according to 2020 estimates.
Any disruption to diesel fuel supplies would have immediate consequences for global supply chains. The dominance of diesel also raises questions about the future.
Environmental regulations are pushing the shipping industry toward cleaner fuels, but alternatives have not yet matched diesel’s performance. Liquefied natural gas, hydrogen, and battery power are all under development, but none has achieved the scale necessary to replace diesel in the near term. For now, the diesel engine remains the workhorse of global trade.
The tanker MS Selandia, launched in Copenhagen in 1912, set a course that the industry has followed ever since. As of the latest available data from 2020, over 90% of global freight shipping still relies on diesel power.
The strategic context is that any nation seeking to secure its supply chains must consider the fuel that moves the world’s cargo. What to watch next: The shipping industry’s efforts to develop alternative fuels and the potential impact of environmental regulations on diesel’s dominance. The record shows that while diesel engines have powered global trade for over a century, the pressure to decarbonize is growing.
How the industry balances efficiency with environmental demands will shape the next chapter of maritime history.
