Cost of enrichment of biogas to biomethane The cost of commercial biomethane has three main components, namely: a) the cost of biogas; b) the cost of enrichment of biogas to biomethane; c) the cost of logistics of produced biomethane.The biomethane project differs from the producing electricity and heat from biogas project. Instead of the cogeneration unit for the "raw" biogas, a purification plant will operate, whereby the physical and chemical parameters of such biogas will be given to the required GHG supply, or for refueling transport. The result is enriched biogas, which is commonly called biomethane. Cost of enrichment of biogas to biomethane. Petro Kucheruk. The platform of sustainable agribusiness SAF Ukraine. July 19, 2019. The Bioenergy Association of Ukraine since 2019 is a partner of the platform of sustainable agribusiness SAF Ukraine.