Cummins is at the forefront of developing turbocharger and engine systems capable of handling alternative fuels like methanol, hydrogen, ammonia, and biofuels to reduce greenhouse gas emissions in the maritime industry. With a focus on meeting IMO's decarbonisation targets by 2030, Cummins is preparing its technology for the mainstream adoption of these fuels. Through insights from John Clark, Cummins' executive director of research and engineering, the article delves into how Cummins is positioning itself as a leader in sustainable marine propulsion. The article discusses the integration of various alternative fuels like methanol, hydrogen, ammonia, and biofuels into Cummins' engines, highlighting the different benefits and challenges of each fuel type. Cummins is adapting its engines to ensure optimal performance with these fuels while meeting environmental standards such as IMO Tier III for lower NOx emissions. Cummins' turbochargers play a crucial role in this adaptation process, designed to handle the specific demands of each fuel. From compensating for methanol's lower calorific value to managing the high air volumes required for complete combustion in hydrogen engines, Cummins' technology addresses the complexities of alternative fuels. The article also emphasizes Cummins' use of digital tools to optimize turbocharger performance, enabling real-time adjustments for the right air-to-fuel ratio based on the fuel in use. This digital integration supports predictive maintenance, enhancing fuel efficiency and operational reliability for ship operators. Furthermore, Cummins is exploring electrified turbochargers that offer rapid response and energy recovery, potentially revolutionizing future propulsion systems. By combining electrified turbochargers with hydrogen engines, Cummins aims to enhance performance and fuel economy in preparation for hydrogen's role as a primary marine fuel. Overall, Cummins' advancements in turbocharger technology and engine optimization demonstrate a positive and proactive approach towards sustainable marine propulsion with alternative fuels.