As an archipelago nation, sea transportation is important for development and logistics distribution between the islands. KMP (Kapal Motor Penumpang) Portlink III is one of many ferries owned by Government of Indonesia operated in Sunda Strait. Ferry vessel is considered as one of the most successful transportation modes in Indonesia and consequently, it contributes significantly to greenhouse gas emissions in Indonesia. there is a need to carry out a research to utilize renewable energy application on this vessel to reduce greenhouse gas emissions and mitigate their impact on the environment, one of which is by using solar panels. With the consideration of geographically abundant in solar radiation, the installation of photovoltaic on Portlink III can generate 0.83 MWh/day and fuel reduction around 638,352 liters annually. This study results in savings of approximately US 3,019,918.76 yearly and reaches the breakeven point in 10.5 years.