Jeju Island is making significant strides in promoting sustainable transportation through the use of green hydrogen. The island is home to a green hydrogen complex that produces hydrogen using wind power, providing a carbon-free alternative to traditional fuels. Currently operating 5 hydrogen buses, Jeju plans to expand the fleet to 20 units by the end of the year. These buses run on green hydrogen, which is produced through the electrolysis of water using renewable energy sources like wind and solar power. Unlike gray hydrogen, which is derived from fossil fuels and emits carbon dioxide during production, green hydrogen is environmentally friendly and sustainable. The green hydrogen production facility in Jeju can produce 1 ton of green hydrogen per day, with the capacity to charge about 50 hydrogen buses daily. The hydrogen buses in Jeju differ from those in other regions as they operate with 100% carbon-free green hydrogen. The island aims to further enhance its fleet by supplying 300 hydrogen buses and 200 hydrogen cleaning vehicles to the public sector by 2030. Jeju's focus on green hydrogen is part of its strategy to address surplus renewable energy production on the island. By converting excess renewable energy into green hydrogen, Jeju aims to achieve a renewable energy generation ratio of over 70% and transition 100% of its base power generation from thermal power to green hydrogen. This innovative approach not only promotes sustainable transportation but also contributes to reducing carbon emissions and advancing environmental goals.