Abandoned mine methane offers Wales an energy and revenue opportunity

The report argues that Wales represents a significant untapped opportunity for abandoned mine methane (AMM) recovery, accounting for approximately half of the UK's modelled AMM emissions. While the UK has 16 operational AMM sites generating £2.3 million in gross profit, Wales has no active projects. The document highlights that South Wales anthracite coalfields are among the most methane-rich in Britain, with potential to generate 880 GWh of electricity and £19.5 million in profit by 2050. However, growth is hindered by a reliance on outdated 2010 DEFRA estimates and a lack of direct, site-level measurement. The report recommends that the Welsh Government mandate direct measurement, prohibit routine venting and flaring, and introduce financial incentives such as guaranteed tariffs and tax credits, citing successful models in France and Germany.

• Wales is a major source of abandoned mine methane (AMM) in the UK, contributing approximately 49% of the UK's modelled AMM emissions in 2023. This equates to 7.8 thousand tonnes of methane, or 655 thousand tonnes of CO2 equivalent.
• South Wales anthracite coalfields are identified as some of the most methane-rich in Britain, with historical measurements showing methane concentrations between 11 and over 20 cubic metres per tonne of coal, significantly higher than the 1–5 m3/t found in many Yorkshire seams.
• There is a significant gap between the potential for AMM recovery in Wales and current activity; while the UK has 16 operational sites, Wales has no active projects. Capturing Welsh AMM reserves could generate roughly 880 GWh of electricity and an estimated £19.5 million in profit by 2050.
• Current UK AMM emission reporting is unreliable because it relies on outdated datasets and models. The underlying database for the DEFRA study used for estimates was last updated in 2005, and there is a lack of direct, site-level measurement infrastructure in Wales.
• France provides a successful model for AMM utilisation through a combination of a tariff control system, where grid operators buy energy at higher prices to reflect risks, and tax benefits, including a VAT reduction from 20% to 5.5%.
• The report recommends the Welsh Government implement three specific policy actions: mandating source-level direct measurement through Natural Resources Wales, prohibiting routine venting and flaring, and introducing targeted financial incentives like price guarantees and tax credits.

APA

Assan, S., & Horner, R. (2026). Abandoned mine methane offers Wales an energy and revenue opportunity. Ember. https://ember-energy.org/app/uploads/2026/06/Abandoned-mine-methane-offers-Wales-an-energy-and-revenue-opportunity.pdf

Chicago

Assan, Sabina, and Rebekah Horner. Abandoned mine methane offers Wales an energy and revenue opportunity. Ember, 2026. https://ember-energy.org/app/uploads/2026/06/Abandoned-mine-methane-offers-Wales-an-energy-and-revenue-opportunity.pdf.

Wikipedia

{{cite report |last1=Assan |first1=Sabina |last2=Horner |first2=Rebekah |title=Abandoned mine methane offers Wales an energy and revenue opportunity |publisher=Ember |date=2 June 2026 |url=https://ember-energy.org/app/uploads/2026/06/Abandoned-mine-methane-offers-Wales-an-energy-and-revenue-opportunity.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{assan2026abandoned, author = {Assan, Sabina and Horner, Rebekah}, title = {{Abandoned mine methane offers Wales an energy and revenue opportunity}}, institution = {Ember}, year = {2026}, month = jun, url = {https://ember-energy.org/app/uploads/2026/06/Abandoned-mine-methane-offers-Wales-an-energy-and-revenue-opportunity.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }