Sri Lanka's unique geographical attributes and abundant wind and solar potential position the country to become the world's first truly green hydrogen economy. The article highlights the urgent need for sustainable energy solutions due to the global dependence on fossil fuels and the environmental consequences of this reliance. Sri Lanka's current heavy dependence on coal and thermal oil for electricity generation poses financial and environmental challenges, emphasizing the necessity for a transition to renewable energy sources. The potential for attracting a trillion dollars in foreign capital by embracing green hydrogen presents a monumental opportunity for Sri Lanka's economic and environmental future. Despite challenges like grid instability, the country aims to capitalize on its renewable energy potential and address existing concerns to make a sustainable and economically sound shift. A comprehensive model has been developed to demonstrate the competitiveness and long-term cost efficiency of green hydrogen production compared to traditional thermal oil generators. By integrating a hybrid renewable energy system, Sri Lanka plans to not only ensure grid stability but also enable cost-effective green hydrogen production for the heavy transport sector, shaping a promising path towards a greener and more prosperous future.