The U.S. Department of Energy (DOE) has launched a Request for Information (RFI) to set a clear definition for Sustainable Maritime Fuel (SMF) in a bid to propel the integration of cleaner energy sources in the maritime sector. This initiative is part of the larger Action Plan for Maritime Energy and Emissions Innovation, which aims to establish a sustainable, accessible, and affordable maritime transportation system in the U.S. by leveraging environmentally friendly fuels. The significance of defining SMFs lies in their potential to significantly reduce greenhouse gas (GHG) emissions from the maritime sector, which currently contributes 4% of the transportation sector's GHG emissions in the U.S. Sustainable fuels derived from sources like biomass and waste have the capacity to cut emissions by over 100%. While efforts are underway to develop drop-in replacement fuels, the industry is urged to explore alternative energy options such as clean methanol, ammonia, hydrogen, electrification, and efficiency enhancements to transition to lower or zero-emission fuels. The collaborative nature of this initiative involves various U.S. agencies like the Department of Transportation, Agriculture, State, and the Environmental Protection Agency to gather feedback on defining SMFs. The RFI aims to address crucial aspects including carbon intensity reductions, sustainability criteria, acceptable feedstocks, and global emission standards. Interested parties have the opportunity to contribute to the RFI by submitting feedback electronically before the deadline. It's emphasized that this initiative is not a funding opportunity but may lead to future funding opportunities based on the responses received. The ultimate goal is to drive innovation in sustainable maritime fuels and steer the maritime industry towards a greener and more environmentally conscious future.