BIOMETHAVERSE (Demonstrating and Connecting Production Innovations in the BIOMETHAne uniVERSE) aims to diversify the technology basis for biomethane production in Europe, to increase its cost-effectiveness, and to contribute both to the uptake of biomethane technologies and to the priorities of the SET Plan Action 8. To this aim five innovative biomethane production pathways will be demonstrated in five European countries: France, Greece, Italy, Sweden, and Ukraine. The project is based on the following founding pillars: Demonstration of innovative biomethane pathways; Technology optimisation and upscaling by technoeconomic flowsheeting; Environmental and social sustainability assessment; Replicability, market penetration, support to planning decisions of other investors and project developers, policy recommendations to policy makers; Dissemination, exploitation and communication of project results. BIOMETHAVERSE relates, within the Work Program 2021-2022 on Climate, Energy and Mobility, to the Call “Sustainable, secure and competitive energy supply”, specifically to the topic HORIZON-CL5-2021-D3-03-16: Innovative biomethane production as an energy carrier and a fuel. The project production routes cover one or a combination of the following production pathways: thermochemical, biochemical, electrochemical, and biological. As a starting point, four demonstration plants use conventional anaerobic digestion (AD), and one uses conventional gasification. In the BIOMETHAVERSE demonstrators, CO2 effluents from AD or gasification and other intermediate products are combined with renewable hydrogen or renewable electricity directly to increase the overall biomethane yield. All demonstrated production routes go beyond conventional technologies, with a circular approach for energy and material, while aiming at reducing the overall biomethane production costs and increasing the biomethane production. The demonstrated technologies will reach TRL 6-7 at the end of the project.