In remote areas of developing countries, access to sustainable energy systems remains often unaffordable for inhabitants. Therefore, special energy supply models and regulatory frameworks adapted to the context of off-grid rural areas need to be implemented to support the dissemination of these systems. This presentation explores how regulators can set a framework for cost-effective and sustainable rural energy services in remote areas. Energy supply models in rural areas can rely on various forms of ownership. Notably, it seems that a well-articulated public-private partnership can contribute to deliver cost-effective energy services.