Mitigating the uneven geographic distribution of renewable energy (RE) and enhancing its utilization are essential for Japan to achieve carbon neutrality and sustainable development. This study aims to evaluate and classify regions based on urbanization levels and RE potential to inform inter-regional cooperation strategies. In this study, 89 regions across Japan were considered. The proposed methods were evaluated based on the urbanization level, RE potential, and surplus RE. In terms of urbanization, cities in Kanagawa Prefecture generally have higher urbanization levels than those in Ibaraki Prefecture. Regarding RE potential, most regions in Ibaraki Prefecture have a self-sufficiency rate above 100%, with substantial surplus electricity. Fewer regions in Kanagawa Prefecture, conversely, have self-sufficiency rates of over 100%, with minimal surplus energy. Besides, regions are classified into four categories based on the median values of these indicators, and current policies show that Yokohama City and most of its cooperating regions fit into the second and fourth quadrants, aligning with the proposed cooperation model. Future research should focus on refining classification methods to enhance regional energy cooperation.