The development of hydrogen energy has gained significant global momentum with countries like Japan, the U.S., Europe, and China releasing strategic plans for hydrogen energy. Over 50 countries and regions have unveiled hydrogen strategies, with the total number of hydrogen projects surpassing 1,500. Despite this progress, challenges such as high production costs and the dominance of conventional hydrogen production methods persist. Addressing the cost of hydrogen production is crucial to promote large-scale growth in the hydrogen energy industry. With renewable electricity prices decreasing and technological advancements, green hydrogen is poised to offer superior economic and environmental benefits. Research on hydrogen energy optimization models is underway to tackle these challenges and optimize production and transportation decisions. A study in China focuses on inter-regional hydrogen energy transmission optimization to maximize economic viability and environmental sustainability. By simulating various scenarios, the study aims to determine optimal cost-effective hydrogen energy layouts under different CO2 emission reduction scenarios. Overall, the global landscape for hydrogen energy presents both challenges and opportunities, with a concerted effort towards cost optimization and sustainability.