RFNBO meaning explained: how RED II and RED III define renewable fuels of non-biological origin, and the 70% greenhouse gas saving that green hydrogen must achieve.
Introduction
An RFNBO is a Renewable Fuel of Non-Biological Origin, and it is the legal category that decides whether your hydrogen counts as renewable in the European Union. The term matters because EU law does not reward hydrogen simply for being made with electricity. It rewards hydrogen that meets a precise definition and a hard carbon threshold. This article explains what an RFNBO is, where the definition comes from, and the 70% rule that every project has to clear.
Where the definition comes from
The RFNBO category is created by EU law, specifically the Renewable Energy Directive. RED II, Directive (EU) 2018/2001, established the framework. RED III, Directive (EU) 2023/2413, raised ambition and added binding sub-targets for renewable hydrogen. These two directives create the category and set the headline 70% savings bar. The detailed method sits in two delegated regulations, 2023/1184 and 2023/1185, which the pillar guide covers in full.
The two tests that define an RFNBO
A fuel is an RFNBO when it passes two tests.
The first test is the source. The energy in the fuel must come from a renewable, non-biological source. That means renewable electricity, such as solar or wind, converted into hydrogen by electrolysis. Fuels from biomass are covered by separate rules and are not RFNBOs. Hydrogen made from fossil gas, even with carbon capture, is not an RFNBO either.
The second test is the carbon saving. The fuel must achieve at least a 70% greenhouse gas saving against a fossil comparator of 94 gCO2e/MJ. This means a lifecycle carbon intensity below 28.2 gCO2e/MJ. A fuel can be made from renewable electricity and still fail this test if the rest of its lifecycle, such as the electricity qualification or the transport, pushes its carbon number too high.
| Test | Requirement | Fails if |
|---|---|---|
| Source | Renewable, non-biological electricity | Made from biomass or fossil sources |
| Carbon saving | At least 70% saving, below 28.2 gCO2e/MJ | Lifecycle carbon intensity too high |
Why RED III raised the stakes
RED III did more than restate the definition. It set binding demand. Hydrogen used in industry must be at least 42% RFNBO by 2030 and at least 60% by 2035, with further requirements in transport. These sub-targets create real, regulated demand for certified RFNBO hydrogen across the EU, which is what makes the category commercially important rather than merely technical. The market and policy drivers are covered in our note on RED III and the EU Hydrogen Bank.
RFNBO is not a marketing label. It is a legal test with a number attached. Meeting it is what gives green hydrogen a place in the EU market.
What this means in practice
For a producer, the RFNBO definition sets the whole design agenda. You have to be able to prove the electricity is genuinely renewable under the additionality and correlation rules, and you have to be able to calculate the lifecycle carbon number under the RFNBO greenhouse gas methodology and show it lands below 28.2 gCO2e/MJ. Getting either wrong means the fuel is not an RFNBO, whatever the marketing says.
How ESGweise helps
ESGweise helps hydrogen and ammonia producers establish, early and rigorously, whether their project meets the RFNBO definition. We build the greenhouse gas and lifecycle model, test the electricity qualification, and identify the gaps that would stop a fuel from qualifying, long before an auditor sees them. See our carbon accounting and reporting services.
Conclusion
An RFNBO is renewable hydrogen as EU law defines it: made from renewable, non-biological electricity, and delivering at least a 70% greenhouse gas saving, below 28.2 gCO2e/MJ. Both tests must pass. Understanding the definition is the starting point for everything else in certification, because a project that cannot meet it cannot be certified, and a project that can meet it has a clear target to design toward.
Frequently asked questions
What does RFNBO mean?
RFNBO stands for Renewable Fuel of Non-Biological Origin. It describes fuels whose energy comes from a renewable, non-biological source, in practice renewable electricity, rather than from biomass or fossil fuels. Green hydrogen made by electrolysis using renewable power is the primary example, and its derivatives such as green ammonia and methanol are also RFNBOs when they meet the rules.
What is the 70% rule for RFNBO hydrogen?
To qualify as an RFNBO, the fuel must achieve at least a 70% greenhouse gas saving compared with a fossil fuel comparator of 94 gCO2e/MJ. That means its lifecycle carbon intensity must be below 28.2 gCO2e/MJ. If it does not meet this threshold, it is not RFNBO-eligible, even if it is made from renewable electricity.
What is the difference between RFNBO and green hydrogen?
Green hydrogen is a general market term for hydrogen made from renewable electricity. RFNBO is the precise legal category under EU law. All RFNBO hydrogen is green, but not all hydrogen marketed as green necessarily meets the RFNBO rules, which require specific proof of additional renewable electricity and a carbon intensity below the threshold. RFNBO is the definition that matters for EU market access.
Which EU laws define RFNBO?
The category is created by the Renewable Energy Directive: RED II, which is Directive (EU) 2018/2001, and RED III, which is Directive (EU) 2023/2413. Two delegated regulations add the detail, 2023/1184 on additionality and correlation and 2023/1185 on the greenhouse gas method.