This study investigates the feasibility, environmental impact and financial implications of implementing shore-to-ship power (S2SP) systems in the container shipping industry. The study revolves around three main goals: looking at the advantages and disadvantages of S2SP, determining its environmental impact and investigating the possibility of retrofitting older vessels. Using cost-benefit analysis (CBA) and Comparative Analysis (CA), this analyses the financial and operational impacts of retrofitting existing vessels as compared to implementing S2SP on newly built vessels. The findings indicate considerable reductions in emissions, while identifying the high upfront costs and lack of availability of port infrastructure as a major challenge for implementation.