Information on certification is divided by country to reflect the different regulations prevailing in England and Wales and those in Scotland.
In England and Wales the certification criteria are the PAS110 together with the 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 only with regard to the PAS110 (not the QP) with further conditions specified by Scottish Environment Protection Agency (SEPA).