The U.S. Treasury Department has issued final regulations for clean hydrogen production tax credits under Section 45V, affecting the renewable energy sector. These rules determine eligibility criteria for the tax credit, focusing on Carbon Intensity (CI) calculations for clean hydrogen projects. The regulations specify how the CI, reflecting life cycle greenhouse gas emissions, will be evaluated using the GREET model. They cover various aspects such as verifying clean hydrogen production, using renewable electricity, and retrofitting existing facilities. The guidelines address three critical issues for clean hydrogen from zero carbon electricity: additionality, hourly matching, and deliverability. Developers have until 2030 to use annual matching, transitioning to hourly matching in 2030. The credit value varies based on CI levels, incentivizing lower emissions. The rules also allow flexibility in calculating emissions to optimize credit value. The final regulations aim to provide clarity and support to developers in the clean hydrogen sector. However, uncertainties remain regarding potential impacts from changes in administration and Congress on the 45V regulations, highlighting the evolving nature of clean energy policy in the United States.