India has surpassed Japan to become the world's third-largest generator of solar energy in 2023. At the International Solar Festival in Osaka, organized by the International Solar Alliance, discussions revolved around partnership opportunities between Japan and India to enhance solar capacity. The event highlighted the significance of solar energy as a catalyst for economic growth. The ISA, with over 100 member countries, emphasizes the need to expand solar generation in developing nations. Japan and India, regarded as leaders in solar technologies, are working towards cooperation in clean energy and energy security. Initiatives like the Clean Energy Partnership and Japan-led Asia Energy Transition Initiative underscore the commitment to renewable energy. Despite some progress, the lack of major Japanese investments in Indian solar projects remains a challenge. Collaboration efforts aim to merge Japan's R&D capabilities with India's market potential. Criticism towards Japan's focus on alternative technologies like hydrogen and ammonia is met with a belief in complementarity rather than opposition to solar energy. The absence of the US and China at the festival raises questions about global solar leadership. However, the positive sentiment towards Japan-India solar collaboration persists, advocating for a harmonious alignment of strengths for a sustainable energy future.