The Association of Southeast Asian Nations (ASEAN) Member States are increasingly focusing on alternatives to electrolysis for the production of ‘green’ hydrogen, such as steam reforming of biofuels and biomass gasification. This chapter analyses the possibility of effectively achieving that under the existing general regulatory framework on energy production, namely the laws on the establishment and operation of factories, as well as environmental protection laws in ASEAN countries that regulate hydrogen production, with special attention on biomass gasification and steam reforming of biofuels. It finds that, despite falling outside of energy regulatory frameworks, hydrogen production from biomass/biofuels is regulated under general legal frameworks on manufacturing activities, occupational health and safety, as well as environmental protection laws. This is demonstrated in more detail by referring to a case study on Thailand. The chapter argues that, in the absence of robust criteria on hydrogen classification, it is possible for an electricity producer that generates electricity from grey hydrogen to gain financial benefits that were formerly thought to be reserved for the promotion of ‘green’ electricity production from blue or green hydrogen, in the case of re-electrification of hydrogen after storage.