Implementing the 45V Rule: What it Means for Green Hydrogen Projects

This briefing analyzes the US Treasury's final 45V guidance for electrolytic hydrogen projects, which establishes a tax credit framework based on three pillars: incrementality, temporality, and deliverability. The guidance provides a transition period for annual matching until 2030, after which hourly matching is required, and introduces flexibility by allowing emissions calculations per hour and per electrolyzer to avoid 'all or nothing' credit losses.

• The 45V final rule maintains a 'three pillars' structure requiring producers to deliver clean power at the time of production to qualify for tax credits, focusing on incrementality, temporality, and deliverability.
• Regarding incrementality, qualifying Energy Attribute Credits (EACs) can come from projects built up to 3 years before the hydrogen facility starts service. Certain at-risk nuclear plants qualify if they had average annual gross revenue below 4.375¢/kWh in any two years between 2017-2021, are merchant nuclear (50%+ wholesale sales), or are single-unit plants capped at 200 MW per reactor. Projects in California and Washington are exempt from incrementality due to existing state decarbonization standards and emissions cap programs.
• The rule extends the allowance for annual matching until 2030, after which hourly matching is mandatory. To increase practicality, the Treasury allows emissions to be calculated separately for each hour and each electrolyzer, meaning a project can still receive a $3/kg credit for the volume of electricity covered by EACs even if the full load is not covered in a given hour, provided the overall facility stays under a 4kg CO2/kg H2 cap.
• Deliverability is managed through defined boundaries and a safe harbor; if a power facility is deemed deliverable for one year, it remains so for the credit period. The system allows cross-regional clean electricity via proper transmission rights and requires hourly NERC E-tag tracking, with additional attestations required for imports from Canada and Mexico.
• Unlike the EU system, the US 45V rule does not require physical ownership or bundling of power and EACs, allowing for more flexible unbundled EAC contracting and trading.
• To secure financing, developers must demonstrate compliance pathways upfront. This includes identifying renewable projects that meet incrementality and deliverability rules and signing contracts for EACs and power to prove project viability to financiers.
• The guidance permits the use of non-incremental grid storage if a registry can track these EACs, though the document notes that storing energy as hydrogen is generally an order of magnitude cheaper than storing it as electricity.

APA

RMI (2025). Implementing the 45V Rule: What it Means for Green Hydrogen Projects. https://rmi.org/resources/implementing-the-45v-rule-what-it-means-for-green-hydrogen-projects/

Chicago

RMI. Implementing the 45V Rule: What it Means for Green Hydrogen Projects. 2025. https://rmi.org/resources/implementing-the-45v-rule-what-it-means-for-green-hydrogen-projects/.

Wikipedia

{{cite report |author=RMI |title=Implementing the 45V Rule: What it Means for Green Hydrogen Projects |date=3 March 2025 |url=https://rmi.org/resources/implementing-the-45v-rule-what-it-means-for-green-hydrogen-projects/ |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{rmi2025implementing, author = {{RMI}}, title = {{Implementing the 45V Rule: What it Means for Green Hydrogen Projects}}, institution = {RMI}, year = {2025}, month = mar, url = {https://rmi.org/resources/implementing-the-45v-rule-what-it-means-for-green-hydrogen-projects/}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }