On January 3, 2025, the IRS and Treasury in the United States released long-awaited final regulations concerning the clean hydrogen production tax credit under section 45V of the Internal Revenue Code. This credit, established by the Inflation Reduction Act of 2022, is a significant component of the Biden Administration's clean energy initiative and serves as a primary tax incentive for clean hydrogen production. Concurrently, the Department of Energy (DOE) issued a White Paper supporting Treasury’s analysis and providing guidance on assessing lifecycle greenhouse gas emissions related to electricity used in hydrogen production. The DOE also introduced an updated version of their model for calculating lifecycle emissions, along with a manual and change log. The final regulations focus on key elements like the 'three pillars' of clean power, additionality/incrementality, temporal matching, geographic matching, and hourly accounting. These rules aim to ensure that renewable energy sources are genuinely additional, matching the hydrogen production in time and location, and enabling hourly emission calculations. Producers can utilize the GREET model to benefit from tax credits, based on the carbon intensity of their production process. The section 45V credit amount varies according to the greenhouse gas emissions during hydrogen production, incentivizing lower emissions. There has been significant debate on the reliance of hydrogen producers on renewable power. While some advocate for stricter rules, these regulations offer flexibility while promoting the use of clean energy. Ultimately, these new regulations are designed to foster the adoption of renewable sources and reduce emissions within the hydrogen production industry in the United States.