This document specifies requirements for part 1 a series of international standards under the general title Sustainable and traceable biogas. These standards establish a framework for assessing and ensuring the sustainability, traceability, and certification of biogas. The document applies to all production pathways of biogas, including but not limited to anaerobic digestion of organic feedstocks, and covers aspects related to sustainability management, performance assessment, traceability, certification, and biomethane certification registry schemes. This series consists of the following parts: Part 1: Requirements for biomethane certification registry schemes – Establishes requirements for biomethane certification registry schemes to authenticate and communicate sustainability attributes of biogas. Part 2: Requirements for performance (related to sustainability aspects) – Establishes performance criteria for biogas production and use, addressing key sustainability indicators. Part 3: Requirements for traceability – Defines requirements for traceability systems to track and verify the origin and sustainability attributes of biogas. Part 4: Requirements for certification schemes – Specifies requirements for the development and operation of certification schemes ensuring compliance with sustainability and traceability requirements. Part 5: Requirements for biogas sustainability management systems – Specifies requirements for implementing and maintaining a sustainability management system in biogas production, ensuring compliance with defined sustainability criteria. This document applies to stakeholders involved in the biogas value chain, including producers, traders, certification bodies, regulators, and end-users. Attempt will be made to synergize this proposal and another related but distinctly different proposal on the development of “Voluntary Certification Guidelines for Biomethane”.