This newsletter examines the newly enacted Law 5215/2025, which establishes a comprehensive regulatory framework for the production and integration of biomethane and hydrogen into Greece’s energy system. The legislation sets out licensing requirements, operational standards, and incentives for producers, including investment and operational aid, exemptions from grid injection charges, and certification of origin through Guarantees of Origin. By enabling connections to national and local gas networks and supporting the conversion of existing facilities, the law aims to stimulate investment, foster innovation, and advance Greece’s decarbonisation and energy diversification objectives in line with European climate goals.