The Southern African Sustainable Energy Conference (SASEC 2024) focuses on researching, developing, and deploying methodologies, technologies, and systems related to sustainable energy within the Southern African context and beyond. This conference offers researchers, engineers, practitioners, decision-makers, and policymakers an opportunity to share and discuss recent developments in the field. These proceedings provide a collection of the innovative research work presented at the conference from leading institutions of higher learning and research councils in South Africa, the Southern African Region, Africa, and globally on a wide range of topical renewable and sustainable energy themes. Topics covered include solar photovoltaic (PV) energy, solar thermal energy, wind energy, green hydrogen and Power2X, bioenergy and waste energy (thermochemical, biological, chemical, and physical conversation systems), the circularity of renewable energy technologies, power systems planning, demand side management, renewable energy resource assessments, and modeling and decision support tools, as well as just energy and decarbonization transitions. Presents current state-of-the-art research on sustainable energy; Discusses research challenges and opportunities in renewable energy; Explores entrepreneurship and commercialization in renewable energy innovation.