Rosneft has concluded due diligence of Essar Oil, which operates the country's second biggest private sector oil refinery at Vadinar in Gujarat.
"We had constructive discussions with management of Essar. We achieved preliminary agreement on the terms and procedure," Rosneft CEO Igor Sechin told reporters after meeting Essar Directors Prashant Ruia and Ravi Ruia here.
Essar Oil owns India's second largest single site refinery, having a capacity of 20 million tons per annum and also has a network of petrol pumps as well as coal-bed methane (CBM) blocks.
Prashant Ruia said Rosneft today confirmed its intention to acquire 49 per cent equity interest in Essar Oil Ltd.
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"Rosneft has completed satisfactory due diligence of Essar Oil," he said. "The parties intend to close the transaction by June 2016 following the execution of mutually agreed binding documents and after receipt of necessary approvals."
The Russian firm in a statement said Sechin has held negotiations with the management of Essar.
"Preliminary mutual understanding has been achieved on the timing and structure of a deal to buy into the equity of Essar Oil Ltd.
Also, the Russian firm will also supply 10 million tons a year of crude to Essar Oil's 20 million tons per annum Vadinar refinery in Gujarat for 10 years.
"In addition an agreement on crude oil deliveries to commence this year has also been achieved," Rosneft said.
Rosneft, the world's top listed oil producer, and Essar Oil & Gas Ltd/Essar Energy Holdings Ltd, companies incorporated and managed under the laws of Mauritius, had in July last year signed a non-binding Term Sheet.
Rosneft is majority owned by the Russian government with BP Plc holding under 20 per cent stake and public shareholding at around 10 per cent.