Hindustan Petroleum Corp Ltd (HPCL) aims to increase its Mumbai refinery's capacity to 200,000 barrels per day from 130,000 bpd, the company said in a statement on Wednesday.
The state-run company also aims to increase the Vizag refinery's capacity to 300,000 bpd from 166,000 bpd.
HPCL will spend 170 billion rupees ($2.88 billion) for expanding the refineries, said B K Namdeo, HPCL's head of refineries.
"After getting the environment approval, we hope to complete Vizag expansion in three years and the Mumbai plan in two to two-and-a-half years," Namdeo said.
He said he hopes HPCL should be able to get the environment approval by the end of this year.