Oil & Natural Gas Corporation spudded its first deepwater exploratory well, MN-DW18-1-H-D, in the Mahanadi Offshore Basin on July 25, 2026. The commencement of drilling, virtually inaugurated by Petroleum and Natural Gas Minister Hardeep Singh Puri from New Delhi, marks a significant operational milestone under the Government of India's Samudra Manthan Mission. This initiative seeks to unlock India's deepwater hydrocarbon potential, directly addressing national energy security goals by reducing import dependence and enhancing domestic production capacity.

The well is being drilled by Rig Platinum Explorer approximately 23 nautical miles from the Konark discovery site off the Odisha coast. This exploration activity aligns with Prime Minister Narendra Modi’s call in his August 15, 2025 Independence Day address to harness India's untapped offshore oil and gas resources. To facilitate this, the government has opened nearly one million square kilometres of previously restricted offshore areas for exploration through forthcoming Open Acreage Licensing Policy (OALP) rounds.

Strategic Context and Potential

India's eastern and western offshore basins, which extend to water depths of up to 3,000 metres, are estimated to hold over 5,600 MMTOE of hydrocarbon potential. Recent exploration successes in the Cauvery, Mahanadi, and Andaman basins have reinforced the commercial promise of these frontiers. The Mahanadi Offshore Basin specifically has seen strengthened prospectivity following ONGC's recent Utkal and Konark discoveries.

To support this national mission, ONGC launched its flagship Deepwater Exploration Mission Centre, DeepX, in Mumbai on January 5, 2026. DeepX integrates the company's geoscientific expertise, advanced interpretation capabilities, specialised training, and strategic global collaborations under the "One Company, One Data" philosophy. This infrastructure is designed to streamline data analysis and improve decision-making for complex deepwater projects.

What the Numbers Show

The scale of the opened acreage—nearly one million square kilometres—indicates a structural shift in India's upstream exploration strategy towards high-risk, high-reward deepwater zones. With an estimated potential of 5,600 MMTOE across basins extending to 3,000-metre water depths, the focus on the Mahanadi Basin leverages recent nearby successes (Utkal and Konark) to de-risk further exploration. The deployment of the Platinum Explorer rig signals ONGC's commitment to executing technically challenging campaigns that were previously constrained by limited deepwater infrastructure.

Every prospect evaluated and well drilled in this campaign contributes to strengthening India's energy self-reliance. As ONGC moves into deeper waters, the success of wells like MN-DW18-1-H-D will be critical in validating the geological models and attracting further investment in India's offshore energy sector.

Oil & Natural Gas Corporation marked the completion of two deep geothermal wells at Puga, advancing India's first demonstration-scale geothermal power project. The successful drilling of wells GT#02 and GT#03 by ONGC Energy Centre was commemorated by the Hon'ble Lieutenant Governor of Ladakh, Shri Vinai Kumar Saxena, on July 17, 2026. This milestone opens new avenues for clean, dependable, and round-the-clock energy in the Union Territory of Ladakh.

The project is expected to strengthen energy access in remote areas and reduce dependence on conventional fuels. It is designed to support reliable power availability during the region's severe winters. Beyond electricity generation, the geothermal energy potential at Puga extends to space heating, greenhouse cultivation, year-round agriculture, food processing, geotourism, and sustainable livelihoods.

Strategic Collaboration and Objectives

The initiative is being advanced jointly by ONGC Energy Centre, the UT Administration of Ladakh, and the Ladakh Autonomous Hill Development Council (LAHDC)-Leh. The collaboration operates under a five-year partnership that was renewed in June 2026. The project aligns with India's clean-energy portfolio, technological self-reliance, and long-term energy-security and Net Zero objectives.

Regional and National Impact

The development is anticipated to contribute significantly to Ladakh's socio-economic development and its aspiration to emerge as a carbon-neutral region. At the national level, it strengthens the country's clean energy capabilities. The occasion was attended by key officials, including Administrative Secretary Shri Himanshu Gupta, IAS, and Secretary to the Hon'ble Lieutenant Governor Ms Shashanka Ala, IAS.

Representing ONGC, Director (Technology and Field Services) Shri Vikram Saxena stated that the achievement reaffirmed the organization's commitment to innovation, energy security, and a sustainable future for Ladakh and India.