On 21 October 2021, the Ukrainian Parliament adopted the Law of Ukraine “On Amendments to Certain Legislative Acts of Ukraine Concerning the Development of Biomethane Production” (“Law”), which supplements the Laws of Ukraine “On Alternative Fuels” and “On the Natural Gas Market”2 with new provisions on biomethane treatment. In addition to the introduction of the “biomethane” definition, the Law establishes grounds for the functioning of the biomethane register and the issuance and circulation of the so-called guarantees of origin of biomethane.