ISO/TC 255 Biogas
ISO is working on a norm dedicated to standardisation in the field of biogas:
Business Plan of biogas standards committee ISO/TC 255
Link to ISO/TC 255 Biogas
The European standards organisation, CEN is working on two specific standards for "Natural gas and biomethane for use in transport and biomethane for injection in the natural gas network".
Link to CEN/TC 408