India's energy Maharatna, Oil and Natural Gas Corporation Limited (ONGC), signed a Memorandum of Understanding (MoU) with Tata Power Renewable Energy Limited (TPREL) to explore new opportunities in the Battery Energy Storage System (BESS) sector. TPREL is a subsidiary of The Tata Power Company Limited. The agreement was signed during the third edition of India Energy Week 2025. This collaboration will focus on several key areas, including large-scale energy storage systems, grid stabilisation, renewable energy integration, hybrid energy solutions, industrial and commercial storage applications, microgrids, backup power solutions, and electric vehicle (EV) charging infrastructure. Both companies aim to use their expertise to drive innovation and growth in the energy storage sector. This partnership also aligns with India's target of achieving 500 GW of non-fossil fuel-based capacity by 2030. Meanwhile, TPREL successfully commissioned India's largest Solar and Battery Energy Storage System (BESS) project -- a 100 MW Solar PV plant with 120 MWh Utility-Scale BESS at Rajnandgaon, Chhattisgarh.