ONGC Takes Over Cambay Block as Vedanta Books Rs 379 Crore Loss

Oil and Natural Gas Corporation (ONGC) has taken operational control of the disputed Cambay offshore oil and gas block from Vedanta, following a Delhi High Court ruling that upheld the government’s decision not to extend the production-sharing contract (PSC). The development marks a significant change in the management of the block, which was previously operated by Vedanta.

Vedanta Oil and Gas Ltd, part of billionaire Anil Agarwal’s business group, has recognised an impairment charge of approximately Rs 379 crore against assets and balances associated with the Cambay block. The company reassessed the value of these assets after the court ruling created uncertainty over its ability to recover the investments and outstanding receivables.

ONGC assumed effective control of the block on July 22, 2026, following the dismissal of Vedanta’s petition by a single-judge bench of the Delhi High Court. However, the dispute has not reached its final legal conclusion. Vedanta subsequently challenged the ruling before a division bench, where hearings concluded on October 1, with the judgment reserved.

The dispute involves the government’s refusal to extend the production-sharing contract, which expired in June 2023. Its outcome could have implications for the participating companies, their investments and the future management of the offshore oil and gas assets.

Why ONGC Took Over the Disputed Cambay Block

The Cambay block, identified as CB-OS/2, is an offshore oil and gas asset operated under a joint venture arrangement involving ONGC, Vedanta and Invenire Petrodyne Limited.

Before the government decided against extending the contract, the participating companies held the following interests in the block:

• ONGC: 50% participating interest.
• Vedanta Limited: 40% participating interest and operator of the block.
• Invenire Petrodyne Limited: 10% participating interest.

Although ONGC already held a 50% participating interest, Vedanta was responsible for operating the block under the existing arrangement. The government’s subsequent decision changed the operational structure by directing the transfer of custody and control to ONGC.

The Ministry of Petroleum and Natural Gas communicated its decision on September 19, 2025, declining the application to extend the production-sharing contract and directing Vedanta to hand over the block to ONGC.

ONGC subsequently sought the transfer of operations and deployed its operational team at Suvali, Gujarat, from September 20, 2025. However, the proposed handover became the subject of litigation after Vedanta challenged the government’s decision.

Vedanta’s Production-Sharing Contract Expired in June 2023

The legal dispute has its origins in the expiry of the production-sharing contract for the Cambay block on June 29, 2023.

Vedanta and its joint venture partners had submitted an application for an extension on June 28, 2021, under the Government of India’s 2017 Extension Policy. The application was submitted before the original contract expired.

The Ministry of Petroleum and Natural Gas subsequently declined the extension request through a communication dated September 19, 2025. The government cited delays and procedural and contractual non-compliances in connection with its decision.

The rejection was significant because the production-sharing contract provided the contractual framework under which the participating companies operated the block. Without an extension, Vedanta’s ability to continue operating the asset under the existing arrangement became uncertain.

What Is a Production-Sharing Contract?

A production-sharing contract is an agreement between a government and companies involved in oil and gas exploration and production.

Under this arrangement, companies generally undertake exploration and development activities while the government retains ownership of the natural resources. The contract establishes how production, costs and revenues are allocated between the parties.

Such agreements also specify the duration of operations, contractual obligations, extension conditions and other regulatory requirements.

For Vedanta, securing an extension was important to maintaining its contractual position in the Cambay block. The government’s refusal therefore created uncertainty about the future of the company’s investments and its operating rights.

Delhi High Court Dismisses Vedanta’s Petition

Vedanta challenged the government’s decision before the Delhi High Court in September 2025. The company disputed the rejection of its extension application and sought legal relief against the proposed transfer of operations to ONGC.

The proceedings initially resulted in interim protection. On June 6, 2026, the court directed the parties to maintain the existing status quo while the dispute was being considered.

However, the legal position changed on July 22, 2026, when a single-judge bench of the Delhi High Court dismissed Vedanta’s petition and upheld the government’s decision not to extend the production-sharing contract.

The dismissal also resulted in the vacation of the interim stay, clearing the way for the government-directed transfer of operational control to ONGC.

ONGC Assumes Effective Control on July 22

Following the court’s order and government directives, ONGC took over the operations and control of the Cambay block with effect from July 22, 2026.

According to ONGC’s regulatory disclosures, the company subsequently applied for a petroleum lease for the block on July 28, 2026.

The takeover was an important operational development because ONGC moved from being a participating joint venture partner to exercising effective control over the block.

However, the transfer of operational control should not be confused with the final resolution of the legal dispute. Vedanta retained the option to challenge the single-judge decision, and the company subsequently approached the division bench of the Delhi High Court.

Vedanta Books Rs 379 Crore Impairment Charge

The loss of operational control and uncertainty surrounding the contract extension prompted Vedanta to reassess the financial value of its Cambay-related assets.

Vedanta Oil and Gas Ltd recognised an impairment charge of approximately Rs 379 crore during the first quarter of FY27. The adjustment was recorded against the carrying value of non-financial assets and certain balances associated with the block.

The company explained that the absence of a valid production-sharing contract and uncertainty over the recovery of assets and receivables were the main reasons behind the reassessment.

The impairment was recognised based on the circumstances and information available to management at the reporting date.

What Does the Rs 379 Crore Impairment Mean?

An impairment charge is an accounting adjustment made when the recorded value of an asset or financial balance is considered higher than the amount that can reasonably be recovered.

Companies periodically evaluate the carrying value of their assets to determine whether their expected economic benefits remain sufficient to support the amounts recorded in their financial statements.

In Vedanta’s case, the dispute over the Cambay block affected the assumptions surrounding the recoverability of investments and other related balances.

The Rs 379 crore impairment therefore reflects a reassessment of the financial value associated with the block. It does not necessarily represent a fresh cash payment or an equivalent amount of money leaving the company’s bank account during the quarter.

The distinction matters because impairment charges affect reported accounting profits and asset values, even though they are not automatically equivalent to cash operating expenses.

How the Impairment Affects Vedanta’s Financial Position

The impairment charge reduces the carrying value of the affected assets and balances in the company’s financial statements. It can also affect reported profitability for the period in which the adjustment is recognised.

Vedanta’s earlier financial disclosures for FY26 had indicated that the carrying value of property, plant and equipment, capital work in progress and certain joint venture receivables associated with the Cambay block was approximately Rs 470 crore.

The subsequent Rs 379 crore impairment highlights the financial significance of the contractual dispute for the company.

However, the earlier Rs 470 crore carrying value and the later impairment charge should not be treated as a straightforward before-and-after calculation. The amounts relate to different reporting dates and accounting assessments, and the impairment covers specified assets and balances.

The final recoverable value will depend on the legal outcome and any subsequent regulatory or commercial developments.

Vedanta Continues Legal Fight Against the Government’s Decision

Although ONGC has taken operational control, Vedanta has continued to pursue legal remedies against the rejection of its contract extension application.

Following the July 22 ruling, the company filed an appeal before a division bench of the Delhi High Court. This appeal challenges the decision of the single-judge bench that upheld the government’s position.

The proceedings have progressed, with hearings concluding on October 1, 2026. The matter was subsequently reserved for judgment.

This means the legal dispute remains unresolved as of the latest disclosed position in the company’s October 29 financial filings.

Why the Division Bench Decision Matters

The division bench’s decision could influence the future legal position of the participating companies and the government’s decision regarding the contract extension.

If the appeal succeeds, the legal position surrounding the rejection of Vedanta’s extension application could change, potentially requiring further consideration of the operational and contractual arrangements.

If the appeal is dismissed, the government’s decision and the existing transfer of operational control to ONGC could remain in place, subject to any further legal remedies available to the parties.

These are possible legal outcomes rather than established developments. The final consequences will depend on the court’s judgment and any subsequent proceedings.

ONGC’s Position in the Cambay Block After the Takeover

The takeover gives ONGC operational responsibility for a block in which it already held a 50% participating interest.

The government-directed transfer changes the operating arrangement that existed under Vedanta’s earlier role as the block operator. ONGC is now carrying out operations under the applicable nomination terms while pursuing the necessary regulatory arrangements.

ONGC’s financial disclosures also make clear that the litigation remains relevant to its accounting and reporting position.

The company has stated that its interest in the block was accounted for as an unincorporated joint venture until June 30, 2026. It subsequently took effective control from July 22, following the court order and government directives.

The distinction between participating interest and operational control is important. A company can hold an ownership or participating interest in a joint venture without necessarily being responsible for its day-to-day operations.

In the Cambay case, ONGC’s 50% participating interest existed before the takeover, while Vedanta held the operator’s role. The government-directed transfer changed that operational arrangement.

Key Events in the Cambay Block Dispute

The dispute has developed through several important contractual, regulatory and judicial events.

• June 28, 2021: Vedanta and its joint venture partners submitted an application seeking an extension of the Cambay block’s production-sharing contract.
• June 29, 2023: The original production-sharing contract expired.
• September 19, 2025: The Ministry of Petroleum and Natural Gas declined the extension application and directed the handover of operations to ONGC.
• September 22, 2025: Vedanta filed a legal challenge before the Delhi High Court.
• June 6, 2026: Interim relief was granted, with the parties directed to maintain status quo.
• July 22, 2026: The single-judge bench dismissed Vedanta’s petition, and ONGC assumed effective control of the block.
• July 28, 2026: ONGC applied for a petroleum lease for the block.
• October 1, 2026: Hearings in Vedanta’s appeal before the division bench concluded, with the judgment reserved.
• October 29, 2026: Vedanta’s financial disclosures recorded the Rs 379 crore impairment and confirmed that the legal matter remained unresolved.

What the Cambay Dispute Means for India’s Oil and Gas Sector

The dispute highlights the importance of contractual certainty in India’s oil and gas exploration and production industry.

Exploration and production projects generally require substantial investment in equipment, infrastructure, technical operations and resource development. These investments are often made over several years, making the duration and enforceability of contractual rights particularly important.

When a production-sharing contract approaches expiry, companies must evaluate whether an extension is likely and how their investments will be affected if operations cannot continue under the existing agreement.

The Cambay dispute demonstrates how a disagreement over contract renewal can eventually affect operational control, asset valuation and financial reporting.

Implications for Oil and Gas Investors

For investors tracking companies involved in exploration and production, the case offers several important considerations.

• Contractual risk: The expiry and extension of production-sharing contracts can directly influence a company’s ability to continue operating an asset.
• Asset valuation: Changes in operational rights can require companies to reassess the recoverability of previously recorded investments.
• Legal uncertainty: Court proceedings can extend the period during which the financial and operational consequences of a dispute remain unclear.
• Operational continuity: A change in operator can alter the responsibilities of participating companies even when their existing participating interests are unchanged.

The Rs 379 crore impairment is therefore relevant beyond its immediate effect on Vedanta’s financial statements. It illustrates how regulatory and contractual developments can translate into accounting consequences for companies in the Energy Sector.

What Happens Next in the ONGC-Vedanta Cambay Dispute?

The next major development will likely depend on the judgment of the Delhi High Court’s division bench. Since hearings have concluded and the matter is reserved for judgment, the legal proceedings have reached an important stage.

Until the court delivers its decision, the ultimate outcome of the dispute and its financial consequences remain uncertain.

Several issues will remain relevant:

• Final judicial decision: Whether the division bench upholds or changes the single-judge ruling dismissing Vedanta’s petition.
• Operational arrangements: Whether ONGC continues operating the block under the existing government-directed framework or further changes become necessary.
• Asset recoverability: Whether Vedanta can recover any of the investments and balances associated with the Cambay block.
• Financial reporting: Whether subsequent legal and regulatory developments require further changes to the company’s asset valuations or financial disclosures.

The available evidence suggests that the operational transfer and the financial impairment are already reflected in the companies’ disclosures, but the final legal position is still pending.

Conclusion: Cambay Block Dispute Remains Unresolved Despite ONGC Takeover

ONGC’s takeover of the Cambay offshore block marks a major change in the operational arrangement following the government’s refusal to extend Vedanta’s production-sharing contract.

Vedanta’s Rs 379 crore impairment charge reflects the financial uncertainty created by the loss of operational control and the difficulty of establishing the recoverable value of assets and receivables associated with the block.

However, the legal dispute remains active. Vedanta’s appeal is awaiting judgment from the division bench of the Delhi High Court, meaning the final consequences for the company and the government’s decision have yet to be established.

For investors and the wider Oil and Gas Industry, the case underlines the connection between contractual rights, regulatory decisions, operational control and asset valuation. The court’s next decision will be central to determining how the dispute develops from here.