Fossil energy depletion, environmental pollution and climate change drive renewable energy development for future generation. Although there are several studies about renewable energy potential, these are focused on theoretical energy potentials that is not applicable to the regional planning. In this study, we evaluate regional technical energy potentials for various renewable energy sources. As the results, rooftop sunlight is the most important renewable energy source among available renewable resources(rooftop sunlight, roadside wind power, small hydro power and biomass). Also the effectively available resources are different depending on the geographical characteristics of all the cities(gu), small cities(si) and rural regions(gun). If renewable energy is autonomously developed in each region, only 44% of regions (102 among 230 regions) will be self-sufficient in electricity consumption.