Energy access remains a critical challenge in Tanzania, especially in rural areas where millions lack reliable electricity. Achieving universal access to sustainable energy is essential for improving health, education, livelihoods, and economic development. To address this challenge, the Energy Access Explorer (EAE), developed by the World Resources Institute (WRI), offers a powerful, data-driven platform that supports planning and decision-making for sustainable energy expansion. The EAE integrates diverse spatial datasets, including population density, current electricity infrastructure, renewable energy resources, and locations of key public services, to identify underserved communities with high potential for electrification. This case study utilized the EAE to evaluate sustainable energy access in Tanzania. These insights can support the national energy goals outlined in the National Clean Cooking Strategy 2024-2034, National Energy Efficiency Strategy 2024-2034, and Mission300 Action Plan that contribute to global efforts under Sustainable Development Goal 7. The EAE enables stakeholders, including policymakers, investors, and non-government organizations such as Tanzania Renewable Energy Association (TAREA), to plan more effectively and equitably, accelerating Tanzania’s transition to sustainable and inclusive energy access.