The project proposes and describes techniques, which can be considered as best available techniques (BAT) used on biogas plants in the Nordic countries in order to give inspiration to the sector and authorities. The project describes the size and characteristics of the biogas industry and the regulatory framework in the countries. Further the project describes the potential environmental impact from different types of biogas plants and utilization of the digestate and energy.The plants included in the project have a permitted treatment capacity larger than 30 and less than 100 tonnes of feedstock per day.Ten BAT candidates are discussed in the report. Among those are location of biogas plant in the planning stage, selection of suitable feedstock in co-digestion, handling of air emissions and quality of biogas. Areas of research and development in the biogas sector are also discussed.