ONGC Videsh Ltd (OVL), the overseas arm of the state explorer, will buy Videocon Mozambique Rovuma 1 Ltd's 10 per cent stake in the Rovuma-1 field for USD 2.475 billion, the company said in a statement.
Rovuma field may hold as much as 65 Trillion cubic feet (Tcf) of inplace gas reserves, more than 10 times the reserves in Reliance Industires' eastern offshore KG-D6 fields.
The transaction is expected to close in the last quarter of 2013.
OVL-OIL need approval of the Mozambique and Indian government, regulatory permissions and existing partners in Rovuma-1 area waiving off their pre-emption rights for the deal to go through.
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Since September last year, OVL has announced deals worth about USD 8.5 billion.
In March, it completed acquisition of Hess Corp's 2.7 per cent stake in Azerbaijan's largest oil field and an associated pipeline for USD 1 billion.
Rovuma-1 has the potential to become one of the world's largest LNG producing areas by 2018, the statement said.