Reviewed by Vincent Crausaz, Business Developer · Updated May 2026
Voluntary Disclosure · EuropeRegulatory status reviewed: April 2026
Biomethane Guarantees of Origin — How They Work
A Guarantee of Origin (GoO) certifies the renewable origin of biomethane injected into the gas grid. The registry system denominates GoOs in MWh units, although transfers and certificates may contain aggregated volumes. The GoO is transferred independently from the physical molecules. Its validity is typically 12 months from the issuance date but sometimes longer depending on the national registry and jurisdiction.
MWhUnit in which biomethane GoOs are issued
2Cross-border hubs — ERGaR and AIB
19RED II Article — the legal basis for biomethane GoOs
Understanding GoOs
What is a Guarantee of Origin, and what is it actually for?
A Guarantee of Origin (GoO) is an electronic certificate used to demonstrate to final consumers that a specific quantity of energy was produced from renewable sources. For renewable gas, including biomethane, the current EU framework is set out in Article 19 of the Renewable Energy Directive (RED II / III), while operational rules are further harmonised through EN 16325.
The GoO documents the renewable origin of the energy in MWh. GoOs operate on a book-and-claim basis, meaning the certificate can be transferred separately from the physical gas. A buyer in one country may purchase and cancel a GoO produced in another country, even though the physical gas itself remains blended within the gas grid.
GoOs are issued, transferred and cancelled through national registries, with cross-border transfers possible where registries are connected through a hub, either ERGaR or AIB.
EN 16325 defines the core principles for GoO issuance, transfer, cancellation and disclosure. Certificates remain valid only for a limited period after the production of the underlying energy and must be cancelled within the applicable regulatory and registry deadlines.
GoOs are primarily a renewable-origin and disclosure instrument. They are used in voluntary markets and regulatory reporting contexts, including renewable energy disclosure and sustainability reporting. However, a GoO alone does not demonstrate compliance with RED sustainability criteria, feedstock eligibility requirements or greenhouse gas reduction thresholds.
For regulatory compliance purposes, such as RED sustainability compliance, EU ETS or FuelEU Maritime, separate sustainability documentation such as a Proof of Sustainability (PoS) issued under a recognised scheme (such as ISCC or REDcert) is required.
GoOs are primarily a renewable-origin and disclosure instrument. They are used in voluntary markets and regulatory reporting contexts, including renewable energy disclosure and sustainability reporting. However, a GoO alone does not demonstrate compliance with RED sustainability criteria, feedstock eligibility requirements or greenhouse gas reduction thresholds.
Critical distinction — GoO is for disclosure, not compliance
A standard biomethane GoO is not sufficient for BEHG, GEG, EU ETS, or FuelEU Maritime compliance. Those frameworks require a Proof of Sustainability (PoS) under RED voluntary schemes such as ISCC EU or REDcert EU, with mass-balance traceability — a fundamentally different mechanism. Using a GoO where a PoS is required leaves a buyer exposed at audit. The certificate type must match the regulatory use case.
GoO vs. Proof of Sustainability — the structural comparison
| Element | Guarantee of Origin (GoO) | Proof of Sustainability (PoS) |
|---|---|---|
| Legal basis | RED II Article 19 | RED II Articles 25–31 |
| Trading mechanism | Book-and-claim | Mass-balance |
| Geographic scope | EU-wide | Global sourcing / framework-specific compliance |
| Physical link | Decoupled from molecules | Connected via mass-balance chain |
GoO at a glanceLegal basisTrading mechanismValidity & cancellationIssuance unitUse casesCompliance noteConnecting hubs
RED II Article 19
Book-and-claim
Periods governed by EN 16325 and applicable national registry rules
In MWh
Voluntary market purposes, regulatory reporting, or certain compliance-related frameworks
For BEHG, EU ETS, FuelEU Maritime, a PoS is required for RED sustainability compliance; a GoO is used for renewable-origin disclosure and market claims
ERGaR and AIB
How it works
The lifecycle of a biomethane Guarantee of Origin
Three steps connect a MWh injected into the grid to a verified disclosure claim by the end consumer.
01
Issued at production
For biomethane injected into the gas grid by a producer, the national registry issues corresponding GoOs. The certificate carries the energy unit, production date, plant identifier, feedstock category and other relevant sustainability or technical attributes, depending on the applicable registry rules.
02
Transferred via ERGaR or AIB
The GoO can be transferred from the producer’s national registry to the buyer’s national registry through the ERGaR (European Renewable Gas Registry) network or AIB (Association of Issuing Bodies). A trader sits between the producer and the buyer to coordinate volume, registry path, and pricing.
03
Cancelled by the end client
To make a green gas claim — whether for voluntary market purposes, regulatory reporting or certain compliance-related frameworks — the end client cancels the GoO within the applicable registry system against a specific instrument or consumption claim. Cancellation may occur within the applicable framework or registry rules. Once cancelled, the GoO is consumed and removed from circulation: it cannot be reused or double-counted. The cancellation record is the audit-ready evidence backing the disclosure claim.
Four things to know
The mechanics buyers and producers actually need to understand
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Book-and-claim — not mass-balance
GoOs are decoupled from the physical gas. The molecules can stay in Denmark while the certificate moves to Switzerland. This makes GoOs flexible and tradable — but also means they cannot prove physical chain of custody. For frameworks that require physical traceability (BEHG, EU ETS, FuelEU Maritime), a Proof of Sustainability under mass-balance logic is required instead.
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The validity and cancellation clock
EN 16325, together with national registry rules, governs how long a GoO stays valid. In practice, a GoO remains valid only for a limited period after the underlying energy is produced, and must be transferred and cancelled within the applicable registry deadlines. Miss the cancellation window and the certificate expires unused — with no commercial value. Active portfolio management between producer, trader, and buyer is essential to avoid stranded volumes.
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ERGaR and AIB connect national registries
Cross-border GoO transfers run through the network of ERGaR (European Renewable Gas Registry) or AIB (Association of Issuing Bodies), which link national registries including Energinet (Denmark), VertiCer (Netherlands), and others. ERGaR and AIB ensure volume integrity across borders — no double issuance, no double cancellation.
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Different functions: GoO vs. PoS
A GoO certifies the renewable origin of the gas, but by itself does not demonstrate RED sustainability compliance, feedstock eligibility or GHG reduction performance. For RED-based frameworks, such as BEHG (soon part of EU ETS II), EU ETS, or FuelEU Maritime, additional sustainability documentation, including a Proof of Sustainability (PoS), is required. GoOs and PoS can therefore apply to the same renewable gas volumes, but they answer different regulatory and commercial questions.
Our role
Your GoO partner across the European registry network
Sourcing, transferring, and cancelling GoOs sounds straightforward — until the registry interface is down, the cancellation window is closing, or the producer’s national registry doesn’t speak directly to the buyer’s. The work is in the operational discipline. We handle it.
BioGem Express works with biomethane producers in Denmark, France, the Netherlands, Germany, and other EU markets. We coordinate the full registry path — issuance, ERGaR or AIB cross-border transfer, cancellation — and deliver the documentation the buyer’s compliance or sustainability team can take into an audit. Where the same physical volumes also need to back a regulatory claim, we structure the parallel Proof of Sustainability path under ISCC EU or REDcert EU.
“A GoO is only worth the registry it lives in and the audit trail behind it. The certificate is the easy part. The discipline of moving it cleanly through the system is what we get paid for.”
Vincent Crausaz — Business Developer, BioGem Express
- Sourcing of biomethane GoOs from European producers across Denmark, France, the Netherlands, Germany, the United Kingdom and beyond
- Full registry coordination: issuance in the producer’s national registry, ERGaR or AIB transfer, cancellation in the buyer’s national registry
- Coordination of GoO transfer and cancellation within the applicable registry
- Parallel Proof of Sustainability path structured under ISCC EU or REDcert EU where compliance use is also required
- Long-term GoO supply via multi-year offtake agreements for buyers with predictable annual volumes
- Compliance pathway alignment for BEHG, GEG, EU ETS, Road transport and FuelEU Maritime obligations
FAQ
Key questions on biomethane Guarantees of Origin
A Guarantee of Origin (GoO) for biomethane is an electronic certificate used to demonstrate that a specific quantity of gas was produced from renewable sources. The current EU framework for GoOs is set out in Article 19 of the Renewable Energy Directive (RED) with operational rules further harmonised under EN 16325. GoOs operate on a book-and-claim basis, meaning the certificate can be transferred independently from the physical gas. They are widely used for renewable energy disclosure, renewable gas claims, reporting and certain compliance-related frameworks. GoOs are issued, transferred, and cancelled through national registry systems connected through a hub, either ERGaR or AIB.
GoO validity, transfer and cancellation rules are governed by EN 16325 together with the applicable national registry framework. In practice, GoOs remain valid only for a limited period and must be transferred and cancelled within the applicable registry deadlines. Once cancelled, the GoO is consumed against a specific claim and cannot be reused or double-counted.
A Guarantee of Origin (GoO) operates under the EU GoO framework set out in Article 19 RED and EN 16325, using a book-and-claim model to certify the renewable origin of gas. It is widely used for renewable energy disclosure, reporting and renewable gas claims. A Proof of Sustainability (PoS) operates under RED sustainability rules using mass-balance traceability and demonstrates compliance with RED feedstock and GHG criteria for regulatory use. Both can apply to the same biomethane volumes, but they serve different functions: a GoO proves renewable origin, while a PoS proves RED sustainability compliance.
Cross-border GoO transfers operate through the ERGaR (European Renewable Gas Registry) or AIB (Association of Issuing Bodies) network, which connect national registries across Europe. A GoO issued in Spain through Enagas, for example, can be transferred to the Netherlands and cancelled in VertiCer for a Dutch compliance market.
BioGem Express is a Swiss-based biomethane trading company, operating since 2020, that sources, transfers, and cancels GoOs across the European registry network. We work with producers in Denmark, France, the Netherlands, Germany, the UK and other European markets — coordinating the registry path from issuance through ERGaR or AIB cross-border transfer to final cancellation in the buyer’s national system. Where buyers also need regulatory compliance under BEHG, Road transport market, EU ETS, or FuelEU Maritime, we structure the parallel Proof of Sustainability path under ISCC EU or REDcert EU on the same physical volumes.
Referenced sources
Sources used on this page
This page draws on the European Commission’s Renewable Energy Directive, the EN 16325 standard, ERGaR documentation, dena’s market analysis, and REGATRACE research on European GoO mechanics.
Key data used here: RED II Article 19 as the legal basis for GoOs and RED II Articles 25–31 for Proofs of Sustainability; the EN 16325 rules governing GoO issuance, transfer and cancellation; and the book-and-claim vs mass-balance distinction from REGATRACE D4.1 (2021).
Legal basisRED II — Directive (EU) 2018/2001, Article 19
European Commission. The legislative basis for Guarantees of Origin for renewable energy, including biomethane. Article 19 defines issuance, transfer, and disclosure rules across Member States.
European standardEN 16325 — Guarantees of Origin Standard
European Committee for Standardization (CEN). The technical standard governing GoO issuance, transfer, cancellation, and validity rules applied across European registries.
Cross-border registryERGaR — European Renewable Gas Registry
ERGaR. The pan-European platform connecting national registries (Energinet DK, VertiCer NL, Enagas ES, and others) that enables cross-border biomethane GoO transfers across the EU.
Market dataBiomethane Industry Barometer 2025
German Energy Agency (dena), 2025. Source for European biomethane market analysis, cross-border GoO transfer trends, and sector sentiment data.
Mechanism researchREGATRACE D4.1 — Renewable Gas Trade Centre
REGATRACE consortium, 2021. Research deliverable formalising the structural distinction between Guarantees of Origin (book-and-claim) and Proofs of Sustainability (mass-balance) for biomethane.
Ready to source biomethane Guarantees of Origin?
We source, transfer, and cancel biomethane GoOs across the European registry network. Whether you need GoOs alone for voluntary disclosure or paired with PoS for parallel compliance use, our team structures the supply that fits.
