This should unlock significant supply for the EU gGO market, with French gGO issuances year-to-date in 2025 already exceeding 10 TWh . While a connection to the AIB gas hub has not yet been established, this is expected to occur before the end of January 2026.
On 19 December 2025, the AIB announced via LinkedIn that Lithuanian TSO and GO registry operator Amber Grid had connected to the AIB gas hub, allowing it to transact GOs with other connected members (eleven at the time of the post). Amber Grid joined the AIB as a gas scheme member in August 2025, when its Domain Protocol had been approved.
These developments are bullish for liquidity, and we may finally see international biomethane GO trading open up; we noted the Renera deal for 1 TWh production in November, which was facilitated by the AIB hub, and could signal larger cross-border transactions in 2026.
Significant volumes still flow via the ERGaR Certificate of Origin (CoO) scheme, which can be described as a GO-like scheme, where members do not necessarily meet the RED criteria for being a national GO issuing body. The ERGaR CoO has been considered the main European biomethane hub. While membership stands at only seven countries, it includes the German biogas register dena, which has been the most active register biomethane transactions in Europe.
On 15 December 2025, ERGaR published Q3 2025 statistics, noting that issuances for the quarter had reached almost 900 GWh, with most volumes heading to Germany and Switzerland.
However, given rising membership numbers in the AIB scheme, and supported by significant issuance volumes (France), it is expected that most European registries will transfer biomethane GOs via the AIB gas hub, which would reduce the influence of the ERGaR CoO scheme. The Dutch registry VertiCer, which is a member of both the AIB and ERGaR schemes, issued notice in August of its intention to disconnect from ERGaR by 1 July 2026 at the latest.
Furthermore, the German gas GO scheme is expected to come online in 2026; subsequent connection to the AIB hub will divert further volumes away from the ERGaR scheme. While the UK GGCS registry remains connected and provides a supply of UK (RG)GOs, market participants have also shown a greater willingness to make RGGO claims outside the scheme via GGCS ex-domain cancellation (a cancellation of an RGGO within the GGCS registry attributed to an international end-user).
The ERGaR CoO scheme is expected to remain relevant as long as it is the main pathway to and from the German biomethane market; this will change with the development of the Umweltbundesamt (UBA) gGO registry and further expansion in AIB scheme membership.
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