A consortium, spearheaded by B9 Energy Storage and involving various partners, has completed the Maritime Power-to-X project, focusing on the utilization of scaleable green methanol and carbon capture loop technology as a zero-emissions fuel for ships and ports. The project, funded by the UK Department for Transport and facilitated by Innovate UK, aimed to meet the criteria for a green shipping corridor through feasibility studies and trials. The project envisions a circular CO2 economy where CO2 captured from an onboard reformer is returned to the methanol synthesis plant, establishing a carbon loop to avoid future supply constraints of green CO2. By synthesizing green methanol from green hydrogen and carbon dioxide in the Port of Larne, the project aims to create a 'true-zero' emissions domestic shipping corridor. Through simulation and modeling, the performance of this technology, including hydrogen reforming and retrofit concept designs, has been assessed. The project also involved trials to demonstrate the feasibility of fuel cells producing electricity for charging battery-electric vehicles. Stakeholder engagement workshops were conducted with regulatory bodies and industry representatives to identify missing regulations and policy measures necessary for the project's implementation. The workshops highlighted areas for a new regulatory framework to support alternative fuels in maritime transport. The project's positive sentiment stems from its successful demonstration of the technology's potential and the identification of regulatory gaps for future development.