The energy transition is of utmost importance to tackle climate change. Different strategies have been put in place with the objective of reducing greenhouse gas emissions, increasing the share of renewable energy (RE) or energy efficiency. In this scenario, hydrogen has been recognized as a promising energy vector due. However, while hydrogen can be produced in different ways, only some of them are zero emission. This includes green electrolysis as one of the most consolidated alternatives due to the potentially low levelized cost of hydrogen (LCOH) obtained, but other sustainable methods are also promising which includes the reforming of biogas from manure or biomass.