In Japan, the government is striving to reduce its reliance on fossil fuels and achieve carbon neutrality by shifting towards renewable energy sources. The Sixth Strategic Energy plan aims to boost the share of renewables, including hydropower, to 36-38% by 2030, compared to the current 21.7%. The growth of renewable energy, especially solar power, has been significant over the past decade, with Japan ranking sixth globally in cumulative deployment and third in installed solar capacity. However, achieving another doubling of renewables' share by 2030 poses challenges. Challenges include community resistance to using mountainsides and forests for solar power generation, high electricity costs impacting the FIT surcharge, the need to enhance the power grid's efficiency for renewable energy, and the development of homegrown technology to reduce dependence on foreign manufacturers. Innovations like perovskite solar cells and floating offshore wind are seen as key to Japan's energy transition success. To address grid balancing, Japan is focusing on promoting battery storage systems through subsidies, energy trading markets, and Long-term Decarbonization Power Source Auctions. The country is assisting energy storage companies to ensure profitability, attracting investors and fostering a sustainable grid energy storage sector. Japanese manufacturers are investing in advanced grid energy storage technologies like redox flow batteries and NAS batteries, showcasing strength in this area. Overall, Japan is proactively working towards a renewable energy transition, overcoming challenges through policy support, technological advancements, and strategic investments in energy storage. With a strong focus on innovation and sustainability, Japan aims to meet its global climate commitments and achieve a greener energy future.