Swiss marine power company WinGD has successfully completed the first-ever Factory Acceptance Test for its X72DF-A dual-fuel ammonia engine, marking a critical commercial milestone for safe, deep-sea alternative propulsion. The 72-bore engine will be installed on a 210,000 dwt CMB.TECH dry bulk carrier, spearheading an early orderbook of 40 units that demonstrates surging industry confidence in ammonia as a viable zero-carbon marine fuel.
Winterthur | June 15, 2026 – In a watershed moment for the global maritime energy transition, Swiss marine power innovator WinGD has successfully completed the Factory Acceptance Test (FAT) for its pioneering X72DF-A dual-fuel ammonia engine.
The successful evaluation, conducted at the CSSC Engine Co. (CSE) facility in China, represents the first-ever FAT approval for this engine class. It marks a critical commercial milestone on the path toward deep-sea decarbonization, providing concrete proof that ammonia can be safely and efficiently utilized as a primary fuel source for large-scale merchant vessels.
The engine is slated for installation on a 210,000 deadweight tonnage (dwt) Newcastlemax dry bulk carrier currently under construction for CMB.TECH.
WinGD X-DF-A Technology Milestone Timeline:
- Fuel in Water Test (FIT) – Achieved
- Type Approval Test (TAT) – Achieved
- Factory Acceptance Test (FAT) – COMPLETED (June 2026)
A Rigorous Testing Regime Under Global Scrutiny
Because ammonia presents distinct handling hazards, primarily toxicity and corrosiveness, the regulatory hurdle for a commercial FAT is exceptionally high.
The test campaign at CSE was carried out under the stringent supervision of leading international classification societies. Representatives from Lloyd’s Register (LR), the American Bureau of Shipping (ABS), and the China Classification Society (CCS) witnessed the performance trials, officially certifying that the engine meets rigorous safety and operational standards.
This FAT certification rounds out a robust multi-year testing framework for the XDF-A platform, complementing the previously secured Fuel in Water Test (FIT) and Type Approval Test (TAT) benchmarks.
The Technical Profile: X72DF-A
The X72DF-A is a 72-bore, low-speed, two-stroke engine optimized for large ocean-going vessels. Its operational mechanics rely on:
- High-Pressure Injection: Ammonia is introduced into the combustion chamber via a high-pressure fuel system.
- Pilot Fuel Ignition: A targeted, low-volume pilot dose of conventional fuel (approximately 5% at full load) is used to ignite the ammonia mixture.
- Parity Performance: In both ammonia and diesel modes, the engine delivers load handling, dynamic response, and thermal efficiency on par with WinGD’s conventional diesel-fueled X-engines.
- Emissions Profile: Throughout its development, the X-DF-A platform has demonstrated a reduction of over 90% in greenhouse gas (GHG) emissions when operating in ammonia mode compared to baseline marine diesel.
The high-pressure fuel supply system for the project was engineered and manufactured by Sunrui Marine Environmental Engineering Co., highlighting the growing maturity of the broader ammonia auxiliary component supply chain.
Strategic Partnerships Drive Innovation
The transition from conceptual engine design to a commercially viable product requires intense collaboration across the entire maritime value chain. Leaders from the involved organizations emphasized that this milestone is the fruit of deep, multi-year industrial partnerships.
“We’re proud to work closely with pioneering shipowners like CMB.TECH to build confidence in ammonia as a safe and efficient marine fuel for a zero-carbon future,” said Dominik Schneiter, CEO of WinGD Ltd. “The successful tests on our technology are the result of strong partnerships, where combined expertise enabled us to address the distinct challenges associated with bringing ammonia-fueled technology to market.”
For the owner, the milestone represents the realization of a long-term strategic bet on alternative fuels. Alexander Saverys, CEO of CMB.TECH, noted the timeline required to bring such cutting-edge technology to fruition.
“We started our journey on the development of the X72DF-A with WinGD four years ago,” Saverys stated. “Thanks to an excellent collaboration, we are able to deliver the first dual-fuel ammonia engines to our large bulk carriers. This is a very important step in the decarbonisation journey of shipping.”
From the manufacturing perspective, the accomplishment positions Chinese shipbuilding infrastructure at the cutting edge of alternative propulsion construction. Zhang Guangwei, Chief Engineer at CSE, reflected on the collective effort:
“Bringing a new engine design into commercial operation is always the result of a strong joint effort between engine and vessel designer, engine builder, shipyard, and owner. CSE is honoured to be the first engine builder in China to deliver ammonia-fuelled engines to the maritime market, and to take an early role in what will become a significant market as ammonia fuel is used more widely in shipping.”
Market Readiness: The 40-Engine Orderbook
The vessel at CSE is the first of a ten-bulker series ordered by CMB.TECH, signaling that top-tier shipowners are ready to commit significant capital to ammonia propulsion.
Far from being a bespoke science project, WinGD’s ammonia platform is quickly gaining broader commercial traction. The company has already secured an early orderbook of 40 X-DF-A engines spanning multiple vessel types. This backlog demonstrates robust market readiness and provides owners with a tangible, scalable pathway to comply with tightening FuelEU Maritime and International Maritime Organization (IMO) carbon-intensity mandates heading toward net-zero targets.
| Engine Platform Feature | Performance Metric |
| Pilot Fuel Requirement | 5% at full load |
| GHG Reduction (vs Diesel) | >90% in ammonia mode |
| Current Total Orderbook | 40 X-DF-A units |
| Initial Vessel Target | 210,000 dwt Newcastlemax Bulker |
The Broader Outlook for Marine Fuel
As the bunkering industry watches closely, the delivery of this first engine shifts the discussion surrounding ammonia from if it can be done safely to how fast the supply infrastructure can scale. While bunkering infrastructure, safety perimeters, and crew training frameworks for ammonia are still in their formative stages globally, the validation of the X72DF-A provides the physical tech baseline the industry has been waiting for.
With its roots stretching back to the Sulzer Diesel Engine business founded in Winterthur, Switzerland in 1893, WinGD has leveraged over a century of Swiss engineering excellence to cement its role at the heart of modern marine power. Backed by its Global Service by WinGD lifecycle support network, the company appears well-positioned to maintain these new assets as they enter live, zero-carbon commercial service across the global fleet.
WinGD: Swiss Marine Power Company
WinGD advances the decarbonisation of marine transportation through sustainable energy systems using the most advanced technologies in emissions reduction, fuel efficiency, hybridisation and digital optimisation. With their two-stroke low-speed engines at the heart of the power equation, WinGD sets the industry standard for reliability, safety, efficiency, and environmental design, supported by Global Service by WinGD, which delivers tailored 24X7 lifecycle engine support through Swiss engineering excellence, dependable maintenance, rapid global response, and genuine parts to keep engines performing at their best.
Headquartered in Winterthur, Switzerland since its origin as the Sulzer Diesel Engine business in 1893, today it is powering the transformation to a sustainable future.
Source: WinGD