The U.S. Department of the Treasury and IRS have finalized rules for the section 45V Clean Hydrogen Production Tax Credit to enhance the clean hydrogen industry in the country. The rules aim to address key issues and provide flexibilities to stimulate growth and advance projects under the Department of Energy's Regional Clean Hydrogen Hubs program. The regulations clarify the roles of hydrogen producers using various energy sources in determining eligibility for the credit. Projects must meet wage and apprenticeship standards to qualify for the full credit, aligning with the Biden-Harris Administration's focus on clean energy job creation. To be classified as truly green hydrogen, electrolysers must be powered by carbon-free energy sources like solar, wind, hydro, or nuclear. The rules set a limit on the lifecycle GHG emissions for hydrogen production to qualify for the tax credit. The final regulations provide clarity and flexibility for clean hydrogen investment, especially in electricity generation through electrolysis. They define incrementality in electricity generation and establish pathways for demonstrating it, including through nuclear retirement risk, state policies, and new CCS. Moreover, the rules set requirements for Energy Attribute Certificates to ensure electricity use for hydrogen production meets emissions standards. They extend the transition period for temporal matching requirements and confirm deliverability criteria. Overall, the rules are seen as a positive step towards scaling the production of low-carbon fuels like hydrogen, driving clean energy deployment, and creating job opportunities in difficult-to-transition sectors.