The oil and gas sector, traditionally a major contributor to greenhouse gas emissions, is undergoing a significant shift towards decarbonisation globally. In India, public sector oil and gas companies like GAIL, IOCL, and ONGC are at the forefront of this transition. These companies are actively diversifying their energy portfolios by incorporating renewable sources like solar, wind, and hydropower. They are also exploring innovative technologies such as green hydrogen, compressed biogas (CBG), and carbon capture, utilization, and storage (CCUS) to reduce their carbon footprint. GAIL, a state-owned natural gas processing and distribution company, has set ambitious targets for decarbonisation, aiming for net zero emissions by 2035. The company is heavily investing in renewable energy, with plans to expand its capacity to 3 GW by 2030. GAIL is blending hydrogen with natural gas, producing green hydrogen at its Vijaipur plant, and establishing multiple CBG plants across the country. On the other hand, IOCL, operating across various sectors ranging from petrochemicals to bioenergy, has also laid out a roadmap to achieve net zero operational emissions by 2046. The company is focusing on green hydrogen, renewable energy, biofuels, and biogas to meet its emission reduction targets. IOCL is actively promoting the adoption of CBG, introducing green hydrogen fuel cell buses, and partnering with other companies to strengthen India's green hydrogen ecosystem. These initiatives by Indian oil and gas companies demonstrate a strong commitment to sustainability and the transition towards a cleaner energy landscape. By investing in renewable energy sources, green technologies, and decarbonisation efforts, these companies are not only reducing their own emissions but also contributing to India's energy security and the global fight against climate change.