This report proposes a comprehensive classification of energy sources and products to address the lack of standardised global energy statistics – an issue that continues to undermine effective policy-making and international collaboration in the context of the energy transition. Despite the growing importance of renewables such as solar and wind in global energy discussions, a key challenge remains; the lack of standardised energy statistics is hindering the comparison of data across nations, energy sources and time. The International Renewable Energy Agency (IRENA) has therefore proposed its own comprehensive energy taxonomy to unify and clarify energy data, which is vital for effective policy-making and international collaboration.