Building Biomethane Credibility through Measurement

Ireland’s planned biomethane expansion needs credible methane measurement, repair and transparent climate claims from the outset. This briefing examines the current policy position, the evidence on emissions, and practical implications for developers, buyers, regulators, funders and communities.

Key findings

Methane emissions vary substantially between biogas sites, so generic assumptions can obscure material losses.
Direct measurement, repair records and transparent reporting provide a stronger basis for biomethane climate claims.
Current German and wider European findings are relevant warning signals, not emissions estimates for Irish facilities.
Ireland’s still-small sector creates an opportunity to embed proportionate verification before rapid scale-up.

Ireland's policy window

This section sets out where Irish biomethane policy stands on 1 October 2026 and explains why the sector's small size gives Ireland an opportunity to build methane measurement, repair and transparency into its rules before the market expands.

A heat obligation still in drafting

The Renewable Heat Obligation is the planned requirement for suppliers of heating fuels to include renewable fuels, among them biomethane, in their sales. The law firm William Fry reported on 25 September 2026 that the Government approved the General Scheme, the outline of the Bill, in July 2025, and that the European Commission then issued a Detailed Opinion finding the scheme's biomethane multiplier incompatible with EU law. The multiplier is an extra credit for domestically produced gas, and Minister Darragh O'Brien said on 16 September 2026 that priority drafting of the Bill is at an advanced stage ⁷. A second law firm article of 13 May 2026 dates the Detailed Opinion to 29 March 2026, records a standstill period to 29 June 2026 and describes 2027 as the working assumption for commencement ⁸.

The same article reports proposed obligations of 1.5% rising to 3% across four fuel categories, applying to suppliers above 400 GWh (gigawatt hours, a measure of annual energy sales), a threshold that the Department's explanatory notes estimate covers about 93% of the fossil fuel heat market ⁸. The heating oil trade body OFTEC wrote on 2 September 2026 that the Government is developing the obligation for implementation in early 2027 ⁹.

Flag: Two timelines remain in circulation, and this issue could not reconcile them with any published Departmental date. The legal advisers' assessment treats 2027 as the working assumption for commencement ⁸, whereas the Department's priority drafting and the Minister's statement point to publication of the Bill before the end of 2026 ⁷. This issue located no Departmental statement that fixes a publication or commencement date, so the two positions fit together only if the Bill appears in late 2026 and the obligation starts in 2027, which neither source confirms.

Interpretation: The multiplier tilted the obligation towards Irish producers, so its removal would change who earns the premium. An obligated supplier meets a percentage target with the cheapest certified molecule, and if the Bill omits the multiplier an Irish plant competes on equal terms with any EU biomethane that carries a valid certificate. Gas Networks Ireland reports that it is piloting imports of mass-balance certificates, which track gas volumes across the network, from other European registries ¹⁰, so commercial weight falls on certification rules that have no confirmed final form.

Three plants, a voluntary registry and unconfirmed funding

Gas Networks Ireland has connected three biomethane plants to the gas grid, as earlier issues recorded, and this issue located no further connection. It also located no opening date for a second round of capital grants for anaerobic digestion, the process that converts organic material into biogas. These findings reflect the public sources reviewed and do not show that connection or grant work has stopped.

The Guarantees of Origin registry, which issues certificates showing the renewable origin of gas, still operates on a voluntary basis while the permanent supervisory framework is prepared ¹⁰. This issue did not locate the finalised requirements that the Commission for Regulation of Utilities committed to publish by September 2026, as the 25 September issue reported.

The argument of this briefing

Ireland can grow biomethane credibly only if it measures and manages methane emissions from the outset. A renewable-gas label does not by itself establish a climate outcome, and two 2026 peer-reviewed studies bear directly on how Irish projects can support their claims.

Interpretation: A small sector gives Ireland an opportunity that larger markets no longer have, because measurement, repair and transparency requirements may be easier to embed in certification and contract design before capacity expands than to add to a large fleet afterwards. The argument rests on five considerations that extend beyond regulatory compliance. Climate integrity requires claimed savings that survive measurement, operational competence requires plants that find and fix their own losses, and investment legitimacy requires that lenders and public funders back projects whose performance they can verify. Buyer due diligence requires evidence that a corporate climate claim can withstand a green-claims challenge, and community trust requires monitoring and repair commitments that residents can check. The evidence below supports the direction of this argument and does not establish what level of monitoring Ireland should require, which remains a design question for regulators, certifiers and the sector.

Featured analysis: methane measurement and climate credibility

This section reports what two 2026 studies found, separates the measures that the debate often merges, and states what the evidence does and does not show for Irish projects.

What the two studies report

Wietzel and Schmidt, writing in Environmental Science & Technology in 2026, measured methane emissions at 65 German biogas production sites using mobile surveys, in which instruments travel downwind of a site, combined with Gaussian plume dispersion modelling, which converts those readings into an emission rate ¹⁶. Measured rates ranged from 0.3 to 255 kg CH₄ an hour, a spread of almost three orders of magnitude that shows large differences between sites and offers no benchmark for any single facility. Small plants lost about 8.8% of the methane they produced on average, and medium and large plants and upgrading facilities lost between 2.9% and 4.3% (measured under survey conditions).

The authors then upscaled their results, extending a measured sample to a wider population through stated assumptions, and estimated that German biogas plants emit approximately 360 to 370 kt CH₄ a year (modelled estimate; kt means thousand tonnes). That figure equals around 23% of Germany's methane emissions, and nobody observed it directly at every plant. The authors report that it exceeds bottom-up inventories, which build national totals from activity data and emission factors instead of direct measurement. The paper is a whole-site measurement and inventory study, and its contribution is evidence that direct measurement can reveal emissions that generic assumptions miss.

Olczak et al., writing in Communications Sustainability in 2026, report a separate study of biogas and biomethane supply-chain emissions in the UK, Germany and Poland ²². They find emissions higher than previous estimates and estimate that 59% could be eliminated at no net cost through existing technologies and improved operating practices (study estimate), a result that belongs to Olczak et al. and that the 65-site German survey did not produce. The first study indicates that sector emissions may be undercounted and the second indicates that a substantial share may be preventable, and neither supplies a complete operational solution.

Five distinctions that govern how the evidence can be used

Distinction	Why it changes the reading
Direct site measurement versus modelled national upscaling	Site measurement observes emissions at the plants surveyed. The 360 to 370 kt figure extends that sample to the national fleet through stated assumptions and remains a modelled estimate.
A short-duration survey versus an annual emissions estimate	A mobile survey captures the hours and conditions of the visit. Emissions vary with maintenance, weather, operating condition, plant design, gas throughput and episodic events, so one survey result is not an annual figure.
Loss as a share of production, emissions intensity, lifecycle carbon intensity and a regulatory saving calculation	A loss rate states the percentage of methane produced that escapes. Emissions intensity states emissions per unit of biomethane delivered, lifecycle carbon intensity covers the whole supply chain, and a regulatory greenhouse gas saving calculation follows a prescribed method. Each answers a different question, and a loss rate does not convert into the others without further data.
German evidence versus Irish project-specific evidence	Germany's fleet differs from Irish grid-injection projects in feedstock mix, plant size, age, design, regulation and market context. German loss rates must not serve as Irish emission factors.
A study-level estimate versus a project-by-project promise	The 59% figure from Olczak et al. is a study-level estimate that depends on assumptions and context. It gives no guarantee that any single project can eliminate that share at no net cost.

The Irish evidence gap

The EU methane regulation that sets the transparency database discussed in the 25 September issue applies to oil, gas and coal placed on the EU market. This issue could not confirm the database launch scheduled for September 2026 ¹⁷. This issue also located no public record of whole-site methane measurement for Irish biomethane plants. The absence of a located record is no evidence that Irish operators conduct no monitoring or that their plants have high emissions, and it does mean that external stakeholders currently have little published evidence for testing climate claims.

What the methane evidence does and does not show

The evidence shows that: methane emissions can vary substantially between biogas sites; direct measurement can identify emissions that generic assumptions may miss; and some supply-chain emissions may be avoidable through existing technologies and better operating practices ¹⁶²². It supports proportionate measurement, verification, repair and transparent reporting for projects making climate claims.

The evidence does not show that: Irish biomethane plants have high methane emissions; German loss rates can be used as Irish emissions factors; a one-off survey represents annual performance; or every project can eliminate 59% of its emissions at no net cost.

Limits of this review: the German sample covers 65 of approximately 9,600 plants, around 0.7% of the fleet, and the upscaling relies on assumptions about unmeasured facilities. This issue worked from the published abstracts, the metadata and the available source material for both studies, and it has not independently reviewed every full-text method, uncertainty range or sampling decision.

Wietzel, J.B. and Schmidt, M. (2026) Whole-Site Quantification of Methane Emissions from 65 German Biogas Plants Reveals Systematic Underestimation in Current Emission Inventories. Environmental Science & Technology, 60(35), 24651–24660, published 26 August 2026. https://doi.org/10.1021/acs.est.6c03851. Open access status: hybrid, with a CC BY-NC-ND licence recorded in the Scite index; the publisher page was not retrievable for this issue, so readers should confirm access at the DOI.
Olczak, M., Dubey, L., Lowry, D. et al. (2026) Majority of methane emissions from European biogas plant supply chains could be eliminated at no net cost. Communications Sustainability, 1(1). https://doi.org/10.1038/s44458-026-00065-3. Open access (CC BY).

Practical implications: a proposed good-practice baseline

This section presents a Climaticus proposal for methane measurement and repair, and explains what it would mean for five groups in the Irish market.

Climaticus view

Climaticus recommendation: This is a proposed good-practice baseline, not an existing Irish legal requirement and not a requirement prescribed by either study. A developer making a public greenhouse-gas saving claim should commission a whole-site methane survey under representative operating conditions, repeat it at fixed intervals and after material operational change, major repair or expansion, and record the method, site boundary, operating conditions, uncertainty range, repair actions and retesting. Reports should clearly distinguish a short-duration survey result, an annualised emissions estimate and a lifecycle greenhouse-gas saving calculation.

Developers

A developer can treat the baseline survey and the repair record as the evidence base for any published saving claim, and can report the three figures separately so that a reader sees which one supports which statement.

Biomethane buyers and offtakers

A buyer can reasonably request the latest survey result, the measurement basis and evidence of corrective action during due diligence, which gives a corporate climate claim an evidence trail that can withstand a green-claims challenge.

Regulators and certification bodies

A regulator or certifier can consider how methane measurement enters the basis of sustainability claims while the Renewable Heat Obligation and the Guarantees of Origin framework remain under development, because requirements are easier to embed before capacity expands.

Funders

Lenders and public funders can ask for the survey and repair record from projects that rely on a claimed saving, and can scale that request to project size, so that support follows performance that they can verify.

Planning authorities and host communities

Planning authorities and host communities can seek clarity on the monitoring schedule, the response to verified leaks, the repair record and the handling of complaints, and can seek these as enforceable commitments with context that makes the numbers intelligible.

Commercially sensitive data can stay protected while buyers, regulators, funders and communities still receive enough evidence to understand the basis of claimed performance. Proportionality keeps the approach workable for smaller plants and gives larger or higher-risk plants a heavier evidence requirement.

Policy and market watch

This section reports seven developments of the week and states the relevance of each to Irish biomethane only where the connection is direct.

Irish items

Energy grant proposals. The Irish Examiner reported on 22 September 2026 that Minister Darragh O'Brien is developing proposals to improve renewable energy grant supports for announcement in Budget 2027 on 6 October. The same report states that wholesale electricity prices rose 76.9% year on year as of August (newspaper report; the underlying market data was not obtained), that the Government will examine options for home heating oil, and that fuel allowance measures for rural households will be adjusted. The report makes no mention of biomethane or anaerobic digestion ¹¹.

Interpretation: Exchequer grants reach households that apply for them, whereas the Renewable Heat Obligation places its cost on suppliers of four fuel categories, and OFTEC warns that this cost reaches consumers ⁸⁹. A rural household that burns heating oil therefore appears twice, as a possible grant applicant and as a customer of an obligated supplier from commencement, and the report does not state who was consulted on the grant design.

Killough planning appeal. The case page for appeal 500924 on the Killough Quarry bio-renewables facility at Holycross, County Tipperary, records a lodgement date of 5 March 2026, which is 210 days before 1 October 2026, and no decision as at that date ¹⁵. Roadstone Limited is first-party appellant, the Killough Community Group is third-party appellant and Tipperary County Council is the planning authority. The case file lists an Environmental Impact Assessment Report and a Natura Impact Statement and records that an Environmental Protection Agency licence is required, and the page publishes no date for a decision ¹⁵. The case bears directly on the social licence that the monitoring commitments above are designed to support.

EU carbon policy

WTO dispute on the carbon border levy. The WTO Dispute Settlement Body established panel DS639 on 25 September 2026 at Russia's second request, a fact reported by two trade outlets because the WTO notice could not be retrieved ¹². Russia contends that the Carbon Border Adjustment Mechanism, the EU levy on the carbon content of imports, creates trade barriers and that the free allocation of allowances under the Emissions Trading System (ETS) amounts to an export subsidy ². At least eighteen members reserved third-party rights, and the EU delegation stated that both instruments comply with WTO rules ¹². The EU allowance price stood at €85.08 on 1 October 2026 on the Trading Economics aggregator, 9.88% above its level a year earlier (reported) ⁶. The relevance to Irish biomethane is indirect and limited to carbon-price assumptions.

ETS reform proposal. The Commission's proposal of 17 July 2026, which has no legal effect until adopted, would reintroduce 15% of the phased-out free allocation for sectors covered by the border levy from 2028 and would make free allocation conditional on decarbonisation investment plans from 2031. It would also add 250 million allowances whose auction revenue between 2031 and 2040 would purchase certified removals from bioenergy with carbon capture and storage and from direct air capture ³. The institutions aim to agree the text by the end of the first quarter of 2027 ³. A summary by the International Carbon Action Partnership records that the text contains no specific provisions for biogenic carbon dioxide, which is carbon dioxide of biological origin such as the stream separated when biogas is upgraded to biomethane ³⁴.

Interpretation: The proposal creates no revenue opportunity for Irish biomethane or biogenic carbon dioxide projects at this stage. Any future relevance depends on unresolved questions of eligibility, certification, transport and storage access. This issue found no evidence that the WTO panel will report before the first quarter of 2027, so a developer who models post-2030 carbon revenue can treat the removal programme as a scenario that resolves when the text is adopted, with no contracted value before then.

Austrian carbon-storage proposal. Bioenergy Insight reported on 25 September 2026 that Austria's government advanced a draft Carbon Dioxide Storage Act to reverse the ban enacted in 2011, and the public consultation stays open until the end of October 2026. The draft limits storage to unavoidable residual emissions from hard-to-abate sectors, which the report lists as cement, steel, paper and ceramics, and it caps annual storage at 5% of Austria's total greenhouse gas emissions (draft proposal) ⁵.

Flag: This issue worked from a trade report and did not obtain the Austrian text, and the report does not state whether biogenic carbon dioxide from biogas upgrading qualifies. The eligible sectors as reported are industrial and none is biogas, so the first beneficiaries appear to be industrial emitters with allowance obligations.

European comparisons

Polish grid-injection project. Bioenergy Insight reported on 30 September 2026 that Axpo and the Polish investor Agro-Biogas have started grid injection at a 1 MW plant at Komorów near Warsaw (reported by the operators). The plant processes manure and slurry, Agro-Biogas holds the majority stake through local farm operators, and Axpo has committed to a 20-year agreement to buy and sell the output (reported) ¹². The reported 1 MW plant description and annual output of approximately 20,000 MWh appear to use different capacity conventions or system boundaries. The source does not specify which, so the figures should not be directly compared. The reported ownership and long-term offtake arrangement illustrate one potential project structure, rather than a model whose suitability for Ireland can be assumed.

Verbio results. The German biorefinery group Verbio reported biomethane production of 1,410 GWh for 2025/26 against 1,190 GWh a year earlier, an increase of 18.5% (company-reported), with 170 bio-CNG and bio-LNG trucks and 46 filling stations in operation ¹³. Ireland's Climate Action Plan 2024 sets a target of 5.7 TWh a year by 2030, according to Gas Networks Ireland ¹⁴. One company's reported output therefore equals 24.7% of the Irish national target, a comparison that carries the limit that Verbio's figures are group totals across several plants and fuels.

Dates for the diary

Four dated items follow for developers, farmers and consortia. Budget 2027 and the renewable energy grant changes arrive on 6 October 2026, when a farm or rural business weighing an installation can check eligibility ¹¹. The IrBEA 25th National Bioenergy Conference runs on 8 October 2026 at the Killashee Hotel, Naas, County Kildare, with a dedicated biogas, biomethane and biofuels programme ¹⁸. The Global Bioeconomy Summit runs from 19 to 22 October 2026 at the Convention Centre Dublin, its standard registration deadline of 30 September 2026 has passed, and prospective delegates can ask the organisers whether late registration remains open ¹⁹. The Circular Bio-based Europe Joint Undertaking call closed on 22 September 2026 after drawing 272 proposals requesting €1.65 billion against a budget of €170.7 million, a ratio of 9.7 to one on the reported figures, with evaluation in October and November 2026, results in January 2027 and grant agreements expected in May 2027 ²⁰.

Live-issues tracker

This table tracks ten live issues and records whether each one moved during the week to 1 October 2026.

Issue	Status at 1 October 2026	Movement
Renewable Heat Obligation commencement	Minister stated on 16 September 2026 that priority drafting is at an advanced stage; no Bill text or commencement date located ⁷	Moved
Biomethane grid connections	Three plants connected; no further connection located	Unchanged
Second-round AD capital grants	No opening date located	Unchanged
Guarantees of Origin registry	Voluntary issuance continues; finalised requirements due by September 2026 not located ¹⁰	Unchanged
EU methane transparency database	Scheduled for September 2026 as reported; launch not confirmed ¹⁷	Unchanged
CBAM and the Russia WTO challenge	Panel DS639 established on 25 September 2026 ¹²	Moved
EU ETS review and removals	Commission proposal of 17 July 2026 in negotiation; agreement targeted by the end of the first quarter of 2027 ³	Moved
European biomethane consolidation	Italian transactions reported in September 2026, including VORN Bioenergy's purchase of five plants with more than 200 GWh of capacity and EQUITA's entry through a 45 GWh a year plant ²¹	Moved
Green claims and climate neutrality claims	Commencement date of 27 September 2026 recorded in the 25 September issue has passed; no new Competition and Consumer Protection Commission guidance located	Moved
National AD planning guidance	No guidance located; Killough appeal live with no decision recorded at 1 October 2026 ¹⁵	Unchanged

Corrections

This section corrects two statements in the 25 September 2026 issue.

Correction to the 25 September 2026 issue, Section 4. That issue described the delay to the EU Methane Transparency Database as a ten-month slip and repeated the figure in its Interpretation box. The trade report on which the item relied gives an original launch date of 5 February 2026 and a new date of September 2026, which makes the delay approximately seven months ¹⁷. The same report attributes the call for delay to eleven member states, including Poland, Italy and the Netherlands, which asked for a three-year delay (reported).

Correction of omission to the 25 September 2026 issue, Section 7. That issue listed the Global Bioeconomy Summit as taking place on 20 to 21 October 2026. The summit website gives the dates as 19 to 22 October 2026 and states that standard registration closed on 30 September 2026, and this issue could not establish which days carry the plenary sessions ¹⁹.

Sources cited in this issue

ESG News, WTO Panel to Review EU Carbon Border Tax, 28 September 2026: esgnews.earth ↩ ↩ ↩
Freight News, Panel to review EU carbon border adjustment mechanism and emissions trading scheme, 28 September 2026: freightnews.co.za ↩ ↩ ↩ ↩
International Carbon Action Partnership, EU Commission publishes EU ETS review proposal (proposal of 17 July 2026), secondary source, Commission text not retrieved: icapcarbonaction.com ↩ ↩ ↩ ↩
Bioenergy Europe, EU ETS review opens new opportunities for the energy transition, 20 July 2026: bioenergyeurope.org ↩
Bioenergy Insight, Austria opens door for BECCS development, 25 September 2026: bioenergy-news.com ↩
Trading Economics, EU Carbon Permits price, 1 October 2026 (aggregator, secondary): tradingeconomics.com ↩
William Fry, Energy legislation: what's moving this autumn?, 25 September 2026: williamfry.com ↩ ↩ ↩
Mondaq, Ireland's Renewable Heat Obligation, 13 May 2026: mondaq.com ↩ ↩ ↩ ↩
OFTEC, Renewable Heat Obligation: when will it deliver?, 2 September 2026: oilinstaller.co.uk ↩ ↩
Gas Networks Ireland, Renewable gas certification registry page: gasnetworks.ie ↩ ↩ ↩
Irish Examiner, Budget 2027: Government considering changes to renewable energy grants, 22 September 2026: irishexaminer.com ↩ ↩
Bioenergy Insight, Poland's first agricultural biomethane plant begins grid injection, 30 September 2026: bioenergy-news.com ↩
Bioenergy Insight, Verbio expands biomethane production, 25 September 2026: bioenergy-news.com ↩
Gas Networks Ireland, National Biomethane Strategy page (target of 5.7 TWh a year by 2030 under Climate Action Plan 2024), 29 May 2024: gasnetworks.ie ↩
An Coimisiún Pleanála, Case 500924 (Killough Quarry bio-renewables facility), accessed 1 October 2026: pleanala.ie ↩ ↩ ↩
Wietzel, J.B. and Schmidt, M. (2026) Whole-Site Quantification of Methane Emissions from 65 German Biogas Plants. Environmental Science & Technology, 60(35), 24651–24660 (abstract and metadata reviewed): doi.org ↩ ↩
Petro Online, EU Methane Transparency Database now due in September 2026, European Commission confirms, 16 July 2026: petro-online.com ↩ ↩ ↩
IrBEA, 25th National Bioenergy Conference 2026: nationalbioenergyconference.ie ↩
Global Bioeconomy Summit 2026: gbs2026.org ↩ ↩
Circular Bio-based Europe Joint Undertaking, 2026 CBE JU call attracts 272 project proposals, 23 September 2026: cbe.europa.eu ↩
World Biogas Association, Global Biogas News Round-Up: September 2026: worldbiogasassociation.org ↩
Olczak, M., Dubey, L., Lowry, D. et al. (2026) Majority of methane emissions from European biogas plant supply chains could be eliminated at no net cost. Communications Sustainability, 1(1) (abstract and metadata reviewed): doi.org ↩ ↩

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