In a groundbreaking development, researchers at IIT Bombay have successfully developed a high-efficiency tandem solar cell with a remarkable 30% power conversion efficiency, surpassing current technologies. This innovation is poised to revolutionize solar energy in India by potentially boosting efficiency by 25-30% and reducing the cost of solar power to approximately ₹1 per kWh, thus decreasing the country's reliance on imported raw materials. The tandem cell, featuring a unique 4-terminal structure combining traditional silicon-based and semi-transparent perovskite solar cells, addresses stability challenges and offers enhanced durability even under adverse conditions. Prof. Dinesh Kabra and his team at IIT Bombay's National Centre for Photovoltaic Research & Education (NCPRE) have paved the way for a game-changing technology that could reshape the solar energy landscape. Moreover, the technology's versatility extends to various applications such as rooftops, vehicle-integrated photovoltaics, and building-integrated photovoltaics, allowing for better land usage and decreased solar electricity costs. This development not only signifies a significant leap in solar energy efficiency but also underlines India's commitment to sustainable energy solutions. Additionally, the article highlights the collaboration between IIT Bombay, the Maharashtra government, and ART-PV India Pvt Ltd in commercializing this innovative technology by December 2027. Prof. Kabra's emphasis on the technology's potential for green hydrogen production further underscores its versatility and importance in the renewable energy sector.