The maritime sector's increasing greenhouse gas emissions pose a challenge to the Paris Agreement's climate goals. Transitioning to zero or near-zero emission fuels faces regulatory and financial barriers. To address this, the concept of green shipping corridors (GSCs) has emerged, aiming to accelerate decarbonization in the sector. A study focusing on China's coastal shipping assesses the feasibility of GSCs powered by renewable hydrogen, methanol, ammonia, or batteries. The research identifies three potential GSC routes and highlights the technological feasibility of using renewable fuels. The study estimates the amount of renewable fuels and electricity required for initial deployment of zero-emission vessels (ZEVs) on these routes. Policy guidelines are deemed crucial to facilitate the deployment of more ZEVs and reduce greenhouse gas emissions. The analysis projects a cost of $7.60/kg for renewable hydrogen by 2030, emphasizing the need for policy support to make GSCs economically viable on a larger scale by 2050.