The ONEPlanET project operates within the context of Africa's urgent need for sustainable development, particularly in energy and resource management. Facing challenges like energy poverty, water scarcity, food insecurity, and ecological degradation exacerbated by climate change, traditional energy sources fall short in providing reliable and affordable electricity access. Existing infrastructure also lacks resilience to climate impacts. This project's overarching goals encompass several key objectives. Firstly, it aims to develop a comprehensive modelling framework that integrates water, energy, and food sectors with broader socio-economic and environmental considerations. Through this, it seeks to offer a holistic understanding of intersectoral linkages to inform decision-making. Secondly, ONEPlanET seeks to promote a transition towards green energy by advocating for the deployment of renewable energy infrastructure. It also aims to support the decarbonization of existing energy plants, identifying pathways for emissions reduction while ensuring energy security. Moreover, the project aims to empower stakeholders, including policymakers, researchers, investors, and citizens, by providing them with tools and knowledge to drive sustainable development initiatives. This includes the co-design and testing of a toolkit tailored to the African context, facilitating informed decision-making and inclusive participation. The expected impacts of ONEPlanET are significant. It aims to enhance sustainable resource management, fostering resilience to climate change and environmental degradation. By addressing key socio-economic and environmental challenges, it seeks to reduce inequalities and ensure equitable distribution of sustainable development benefits. Furthermore, it aims to support policy development by providing evidence-based insights and recommendations. Lastly, through knowledge sharing and capacity building, ONEPlanET seeks to foster collaboration among stakeholders and build local capacity for sustainable development initiatives.