The Renewable Energy Association's Biofertiliser Certification Scheme (BCS), which is part of the overall REAL Assurance Scheme, has been created for the purpose of certifying biogas plants in England, Wales and Northern Ireland against the PAS110 and Quality Protocol (QP) for the production and use of Quality Outputs from the anaerobic digestion of source-separated biodegradable waste. Biogas plants in Scotland will be certified against the PAS110 (not the QP) with further conditions specified by Scottish Environment Protection Agency (SEPA).

This section gives the background to the development of the PAS110 and Quality Protocol, and details of the Biofertiliser Certification Scheme.