Biomethane made from the anaerobic digestion of organic waste can provide several economic and environmental benefits such as: the valorisation of waste products, increased resource efficiency, increased retention of nutrients through recycling of biogas digestate (Banks, et al., 2011), reduction of greenhouse gas emissions (Börjesson, et al., 2016) as well as the reduction of nitrogen oxides and particulate matter emissions (Börjesson & Berglund, 2007).To help actors understand when and where biomethane solutions can succeed, including the qualitative and quantitative aspects of a solution, an Early Assessment Method has been developed. The categories included in the assessment are potential, feasibility, economic and environmental performance. The Early Assessment Method was developed using a multi-criteria framework and consists of 15 key areas and 24 key indicators that should be considered when assessing biomethane solutions. Each quantitative indicator can be assessed either with site-specific data or by using generic equations and average values while the qualitative indicators are given a five-grade scale to facilitate the assessment.The potential category focuses on assessing how much raw material there is in the investigated area and how much of the usable products can be produced. The final areas are: biomass potential, biomethane potential and bio-fertilizer potential. In the feasibility assessment, qualitative aspects are assessed using a five-grade scale. The key areas for feasibility include: customer demand, competing applications, strategies for renewable fuels, legislation, economic instruments and infrastructure suitability. Performance is assessed both for economic performance and environmental performance to understand how the biomethane solution would perform if implemented. Economic performance includes both an indicator for cost per unit produced and an indicator for the investment cost for each production step. The key areas included are: biogas generation cost, biogas upgrading cost and biomethane distribution cost. The environmental performance is evaluated to understand how environmental aspects would change if biomethane replaced an alternative fuel on the market in the studied region. Key areas to assess this are: climate impact, air quality and nutrient recycling. These areas highlight some important benefits of using biomethane over fossil fuels, which are the most common fuels for heavy-duty vehicles.A two-part Early Assessment Tool was also developed. The tool is included in the method, but can be used separately if the user has a basic knowledge of biomethane. It assists with information collection, through a questionnaire, and structuring and presenting data, through a spreadsheet. The design of the Early Assessment Tool favours simplicity and usability while striving to maintain relevant information. It is meant to be used both for educational and investigative purposes when providing an early assessment of biomethane solutions within a certain region. The result from the tool can aid when making decisions and help with identifying which local actors to involve and what consultancy work might be needed to realise a biomethane solution.