The U.S. Department of the Treasury and the Internal Revenue Service have finalized rules for the 45V Credit for the Production of Clean Hydrogen, detailing how heat-trapping emissions associated with hydrogen production are calculated. Union of Concerned Scientists (UCS) stresses the need for rigorous emissions accounting to ensure that incentives support genuinely low-carbon hydrogen projects. Julie McNamara, a senior analyst at UCS, applauds the Biden administration for establishing a foundation that aligns incentives with the development of a sustainable hydrogen industry for the present and future clean energy needs. However, she raises concerns about loopholes that could allow heavily polluting hydrogen projects to evade accountability through carbon accounting manipulation. McNamara advocates for incentivized hydrogen projects to undergo thorough evaluation to confirm their cleanliness in terms of climate, health, and environmental impacts, emphasizing the importance of 'clean' truly being clean. Notably, the final rules reject certain loopholes that would have enabled some industry actors to profit at the expense of the clean energy transition. Despite this progress, there are persistent worries about potential loopholes that could undermine the environmental integrity of hydrogen production.