CRONBs 2037 Target Drops from 9% to 8%: What Changes for Transport

Key data

If your company operates road transport fleets or supplies renewable fuels in Spain, the target you were supposed to reach in 2037 has just changed. The Royal Decree 611/2026 contained an error in its Annex IV: the CRONBs (renewable fuels of non-biological origin) sub-target for road transport in 2037 was listed as 9%, when the correct value is 8%. The correction of errors published on September 12, 2026 rectifies this figure with immediate effect.

Although at first glance it seems like a minor adjustment, it has real consequences: renewable incorporation targets determine the compliance obligations of operators and, therefore, the risk of sanctions if they are not met. Planning based on incorrect data could mean unnecessary investments or, conversely, oversized contractual commitments.

What does this regulation establish?

Royal Decree 611/2026 regulates the decarbonization framework for the transport sector in Spain and sets sub-targets for incorporating different types of renewable fuels by target year. One of these sub-targets, included in Annex IV, relates to CRONBs (renewable fuels of non-biological origin) in the road transport segment.

The correction published on September 12, 2026 modifies exclusively that specific figure:

The rest of the content of Royal Decree 611/2026 remains unchanged. Other sub-targets, other target years, and other types of renewable fuels are not modified.

CRONBs include fuels such as renewable hydrogen and synthetic fuels (e-fuels) produced from renewable energy sources. They are distinct from conventional biofuels and renewable fuels of biological origin (biofuels). Their progressive incorporation into the fuel supply chain for transport is one of the key levers of the sector's decarbonization policy.

Economic and operational impact

The reduction of one percentage point in the 2037 sub-target may seem marginal, but it has concrete practical effects:

• Lower long-term investment pressure: Suppliers who had committed CRONBs production capacity or supply contracts to reach 9% in 2037 can review those commitments downward.
• Review of compliance plans: Road transport companies that calculated their CRONBs incorporation needs based on 9% now have an additional margin of one percentage point for 2037.
• Risk of oversizing: Those who signed CRONBs purchase agreements based on the incorrect 9% target could have assumed commitments exceeding what is legally required.
• Impact on sanctions: Renewable incorporation targets directly condition compliance obligations and possible sanctions for non-compliance. A lower target reduces the risk of non-compliance for those who were tight in their projections.

Who does it affect?

• Road transport companies: Truck fleets, buses, delivery vans, and any operator consuming fuels subject to the renewable sub-targets of RD 611/2026.
• Renewable fuel suppliers and distributors: Companies that produce, import, or distribute CRONBs (renewable hydrogen, e-fuels, and similar) for the Spanish transport market.
• Regulatory compliance and sustainability departments: ESG managers, operations directors, and CFOs who have included the 9% target in their strategic plans or sustainability reports.
• Advisors and consultants in the energy and mobility sector: Professionals who have communicated the 9% figure to their clients as a planning reference.

Practical example

Imagine a road freight transport company that, upon reading Royal Decree 611/2026 published in July 2026, incorporated into its 2026-2037 strategic plan the target that 9% of its fuels would come from CRONBs in 2037. To achieve this, it negotiated with its usual supplier a renewable hydrogen supply contract sized to cover that 9%.

With the correction published on September 12, 2026, the legal target is now 8%. This means the company has a margin of one percentage point that it could renegotiate with its supplier, reduce the committed volume, or reallocate to other uses. If the contract is already signed, the legal team will need to assess whether there is a revision clause linked to regulatory changes.

Similarly, an e-fuels supplier that had calculated its necessary production capacity for 2037 based on 9% of the road market can adjust its infrastructure investments downward by that percentage point.

What should companies do now?

1. Review strategic compliance plans: If your company had set 9% as the CRONBs target for 2037 in road transport, update that figure to 8% in all internal documents, sustainability reports, and business plans.
2. Audit CRONBs supply contracts: Check if you have purchase contracts for renewable hydrogen, e-fuels, or other CRONBs sized based on the 9% target. Assess whether it is possible or advisable to renegotiate volumes.
3. Update ESG and sustainability reports: If the 9% target appears in sustainability reports, non-financial statements, or investor presentations, correct it with explicit reference to the correction of errors in RD 611/2026.
4. Inform advisors and consultants: Communicate the change to external professionals managing your regulatory compliance in renewable fuels so they can update their recommendations.
5. Consult the official text: Access directly the correction of errors published in the BOE to have the correct figure from its primary source.

Official source

Consult complete regulation in official source

Disclaimer: This article is for informational purposes only and does not constitute legal advice. For specific decisions, consult a qualified professional. Source: https://www.boe.es/diario_boe/txt.php?id=BOE-A-2026-19051