The corporate affairs ministry's decision to exempt such deals from the ambit of the Competition Commission of India (CCI) comes against the backdrop of the proposed consolidation and stake purchases among state-owned oil and gas companies.
In July, the Cabinet Committee on Economic Affairs (CCEA) approved sale of the government's 51.11 per cent stake in oil refiner HPCL to the country's largest oil producer ONGC.
The ministry has said all cases of combinations involving the central public sector enterprises (CPSEs) operating in oil and gas sectors under the Petroleum Act, 1934, have been exempted from the CCI approval requirement for five years.
Sections 5 and 6 pertain to combinations.
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Under the norms, combinations or deals beyond a certain threshold compulsorily require approval from the CCI.
Earlier this year, the ministry exempted mergers of nationalised banks from seeking CCI's approval.
About the latest notification, law firm Chandhiok & Associates said the exemption comes right before the government's implementation of policy to merge major oil public sector undertakings.
"This policy is also likely to hinder harmonisation of Indian competition law with set international practices recommending competitive neutrality between private and public sector," it said in a note.
The CCI keeps a tab on anti-competitive ways across sectors to ensure fair practices are followed.