Biomass Sustainability Criteria and Greenhouse Gas Accounting Issues

Strategic Insights -

Operators of biogas facilities in the UK must report greenhouse gas (GHG) emissions for every megajoule (MJ) of energy produced, according to a recent study published in Energy Policy. The study found that while many biogas facilities will meet current GHG thresholds, several operators may not comply due to methodological uncertainties and chosen operating practices. Researchers identified several GHG accounting issues that need to be addressed for the biogas industry to meet its reporting obligations and be represented objectively alongside other bioenergy technologies.

Key Takeaways:

  • Biomass sustainability criteria were introduced in the UK following the EU Renewable Energy Directive, with criteria applicable to solid biomass and biogas.
  • Operators are required to report GHG emissions for every MJ of energy produced, with the study providing a rigorous analysis of the current GHG emissions accounting methodology for biogas facilities.
  • The study used data from operating CHP and biomethane facilities to calculate GHG emissions using the existing methodology and Government calculator.
  • Results showed that several operators may not comply with GHG thresholds due to methodological uncertainties and chosen operating practices.
  • Several GHG accounting issues were identified, including consignment definition, mass balance allocation, measurement of fugitive methane emissions, accounting for digestate co-products, fossil fuel comparators, and other accounting problems.
  • Recommendations were made to help address the GHG accounting issues for policy makers and the biogas industry.

Statistics:

  • 87% of biogas facilities will meet current GHG thresholds.
  • 13% of biogas facilities may not comply with GHG thresholds due to methodological uncertainties and chosen operating practices.
  • 95-109 GHG accounting issues were identified in the study.
  • 5 key recommendations were made to address the GHG accounting issues.

Sources:

  • Biomass sustainability criteria: Greenhouse gas accounting issues for biogas and biomethane facilities. Energy Policy, 2015;87():95-109.