The policy brief authored by experts from Net Zero Think Bangalore, University of Oxford, and CCG outlines India's National Green Hydrogen Mission (NGHM) launched in January 2023. The mission targets zero emissions by 2070 and aims to position India as a global green hydrogen production and export center. Tamil Nadu, with its renewable energy resources and strategic location, is highlighted as a key player in this transition. The focus on the fertiliser industry is crucial due to its contribution to the state's GDP and livelihoods. The brief proposes policy actions including Viability Gap Funding (VGF) and Production-Linked Incentives (PLI) to support green hydrogen projects, mandating green ammonia blending, investing in skill development, expanding R&D in electrolyser design, and facilitating access to green bonds and carbon credits. By leveraging these strategies, Tamil Nadu can accelerate its transition to a green hydrogen economy, contributing to India's 2070 emission targets and sustainable economic growth.