Legal Battle Stalls ONGC’s Takeover of Key Cambay Basin Block
A high-stakes legal confrontation has emerged within India’s upstream oil and gas sector, placing the operational future of the crucial Cambay basin block CB-OS-02 in Gujarat in limbo. State-owned exploration giant Oil and Natural Gas Corporation (ONGC) finds itself unable to assume control of the block, despite a government directive, as diversified conglomerate Vedanta mounts a robust legal challenge against the Ministry of Petroleum and Natural Gas’s decision to deny a contract extension.
The Ministry issued a clear directive on September 19, 2025, rejecting the extension of the Production Sharing Contract (PSC) for the CB-OS-02 block. This asset features a complex ownership structure: ONGC holds a substantial 50 percent participating interest, Vedanta controls 40 percent through its Cairn Oil and Gas unit, and Invenire Petrodyne Limited rounds out the consortium with a 10 percent stake.
ONGC’s Preparedness Meets Legal Roadblock
Following the government’s decisive action, ONGC was instructed to immediately take over operational responsibilities for the block. Demonstrating its readiness, ONGC promptly dispatched an operational team to Suvali, Gujarat, on September 20, 2025, anticipating a swift transition. However, the handover remains incomplete, with Vedanta steadfastly refusing to relinquish control.
In its disclosures accompanying its FY26 earnings statement, ONGC explicitly stated, “Pursuant to the Government of India directive, ONGC requested Vedanta for the immediate handover and deployed its operational team at Suvali, Gujarat, from September 20, 2025. However, Vedanta has not yet handed over the operations.” This statement highlights the ongoing impasse and the operational challenges stemming from the dispute.
High Court Intervenes, Status Quo Maintained
The legal dimensions of this dispute intensified when Vedanta filed a writ petition with the Delhi High Court on September 22, 2025. The petition directly challenges the government’s refusal to extend the contract terms, setting the stage for a judicial review of the Ministry’s decision. The court, acknowledging the gravity of the situation, instructed all respondents to submit their replies and, crucially, ordered the parties to maintain the “status quo” until a final judgment. This judicial intervention means Vedanta continues to operate the CB-OS-02 block, despite the expiry of its original PSC and the government’s subsequent non-extension.
Further developments in the courtroom saw all hearings conclude on May 18, 2026, with the matter now reserved for a final order by the court. Until this ruling is delivered, the legal directive mandates that Vedanta, through its Cairn Oil and Gas unit, retains its role as the block’s operator. ONGC, while currently sidelined from operational control, maintains its posture of readiness, prepared to assume management as soon as a favorable government or judicial directive permits.
A spokesperson for Vedanta Cairn, while restricted by the sub-judice nature of the proceedings, confirmed the court’s order for status quo, refraining from further commentary. This legal quagmire underscores the inherent risks and complexities involved in long-term energy contracts, especially when government policy shifts or contract renewals are contested.
Understanding the Production Sharing Contract (PSC)
For investors monitoring India’s oil and gas landscape, understanding the Production Sharing Contract (PSC) mechanism is vital. A PSC represents a contractual framework between a government and an resource extraction company. It grants the company specific, time-bound rights to explore, develop, and produce hydrocarbons from a designated area. In return, once the company has recovered its initial costs, it shares a pre-agreed portion of the produced output, known as “profit petroleum,” with the government.
The original PSC for the CB-OS/2 block was executed on August 30, 1998, and officially expired on June 30, 2023. Vedanta’s consortium continued to operate the block during the period its extension application was under review. With the Ministry’s subsequent denial of extension, the block was technically slated to revert to government control, triggering the current dispute.
CB-OS/2: A Look at Production and Reserves
The CB-OS/2 block encompasses the Lakshmi and Gauri fields, which collectively contribute approximately 3,400 barrels of oil per day (bopd) and 3.4 lakh standard cubic metres of gas per day (mscmd) to India’s energy supply. While not a flagship asset for Vedanta, these fields represent consistent production. The block, spanning a 3,314 square kilometre shallow water area, has demonstrable reserves. A 2019 reserve report commissioned by Vedanta Cairn from DeGolyer and MacNaughton indicated total in-place reserves of 13.6 million barrels of oil and oil equivalent gas (MMBOE) across the Gauri and Lakshmi discoveries.
Interestingly, despite the impending PSC expiry, Vedanta Cairn had pressed forward with development plans for these discoveries, signaling a long-term commitment to the block prior to the extension denial.
Broader Context: Vedanta’s Indian Upstream Footprint
This dispute, while significant for ONGC and Vedanta, must be viewed within the larger context of Vedanta’s extensive upstream portfolio in India. The CB-OS/2 block was one of three key properties operated by Cairn India when Anil Agarwal’s group acquired the firm in 2011 for a staggering $8.67 billion. Cairn India subsequently merged into Vedanta Ltd in 2017, consolidating its energy assets.
The other major assets included the prolific Barmer oil fields in Rajasthan (block RJ-ON-90/1) and the Ravva oil and gas fields in the Krishna Godavari basin off the Andhra coast (PKGM-1). Unlike CB-OS/2, Vedanta successfully secured PSC extensions for these two critical blocks. The Rajasthan block, RJ-ON-90/1, received a 10-year extension until May 14, 2030, while the Ravva field (PKGM-1) was granted a similar 10-year extension until October 27, 2029. This contrasting outcome for CB-OS/2 indicates a specific, perhaps undisclosed, rationale behind the Ministry’s decision for this particular block.
From a financial perspective, Vedanta Cairn’s spokesperson noted in September 2025 that the CB-OS/2 block contributed less than 0.3 percent to Vedanta’s overall EBITDA. While this suggests a limited direct financial impact on the diversified giant, the principle of contract sanctity and the precedent set by this legal battle could have broader implications for investor confidence in India’s energy sector. The market will closely watch the Delhi High Court’s final order, as it will undoubtedly shape future investment and operational strategies for both domestic and international players in India’s dynamic oil and gas landscape.