The global energy landscape presents stark contrasts between aspiration and reality. While international agreements champion clean energy access for all, nearly 900 million people worldwide lack basic electricity, with millions more suffering from unreliable and costly power supplies. This policy brief examines how G20 nations can lead the implementation of SDG7 (Affordable and Clean Energy) through best practices that ensure a just energy transition – one that balances environmental imperatives with economic development and social equity. Drawing from cases in Brazil, Vietnam, India, and Mexico, we identify actionable strategies that the G20 can implement to advance energy justice while addressing global inequalities. This brief emphasises that successful implementation requires not only technology and financing but also inclusive governance systems that centre the voices of historically SUB marginalised communities in decision-making processes.