Wärtsilä Implements Fit4Power Solution to Enhance Efficiency of ONE Maestro
Wärtsilä has been contracted to provide a conversion package that includes its Fit4Power radical derating solution for the containership ONE Maestro. This solution is designed to optimize the engine’s power output, leading to an average fuel consumption reduction of about 13 % and a subsequent decrease in emissions. The conversion is expected to extend the operational lifespan of the vessel.
The ship, owned by Ocean Network Express (ONE) and managed by ONESEA Solutions, had its conversion order placed with Wärtsilä in the first quarter of 2025. ONE Maestro is a 6 700 TEU vessel capable of speeds up to 27 knots. In compliance with regulatory requirements, including the IMO’s Carbon Intensity Indicator (CII), the containership currently operates at fuel-efficient, reduced speeds.
Source: wartsila.com
Wärtsilä indicated that the Fit4Power solution will further enhance the performance of ONE Maestro by equipping it with a “leaner, healthier” engine through technical modifications, such as a reduced bore size. These improvements in engine efficiency are expected to extend the ship’s CII compliance by approximately four years, resulting in annual CO2 savings of around 4 000 tons, along with a reduction in cylinder lubrication oil consumption.
Hiroki Tsujii, global chief officer and head of product and network division at Ocean Network Express, stated that Wärtsilä’s Fit4Power derating solution meets ONE’s operational needs. By optimizing engine power output while reducing fuel consumption, Wärtsilä is helping ONE achieve its sustainability goals without sacrificing performance. He emphasized that this technology is a practical approach to extending the vessel’s CII compliance as they continue to improve fleet operations.
Wärtsilä’s conversion package will include two new turbochargers and its Intelligent Combustion Control (ICC) system. These technologies will be supported by Wärtsilä’s Data Collection Unit (WDCU), which will enable cloud-based services and remote monitoring to optimize performance, fuel efficiency, and scheduled maintenance. The package will also feature Wärtsilä’s digital predictive maintenance service, Expert Insight, along with remote operational support.
The delivery of the Wärtsilä equipment is scheduled for June this year. Since the commercial launch of Fit4Power in 2023, the solution has been retrofitted on 17 vessels, with more installations planned.
Stefan Wiik, vice president for parts and field service at Wärtsilä Marine, remarked that the shipping industry aims to achieve net zero emissions by 2050, and operators must utilize all available tools to expedite this transformation. He noted that improving engine efficiency with solutions like Fit4Power is a valuable way for the industry to accelerate the decarbonization of the existing fleet.
Wärtsilä also recently announced test results for its 4-stroke ammonia engine, which demonstrated up to a 90 % reduction in greenhouse gas emissions compared to conventional diesel engines.
