Reliance Industries will invest Rs 1.5 lakh crore in its core business verticals over the next three years.

The company will make investments in exploration and production of oil and gas, petroleum refining and marketing, petrochemicals, retail and 4G broadband networks. All of the investments in core energy and material businesses are in brownfield sites.

Meanwhile, the company plans to increase the overall capacity of petrochemical from 15 million tpa to 25 million tpa.

Besides, its polyester business will also see an expansion in capacity from 1.4 million tpa to four million tpa. The project is expected to be commissioned in the first half of the current financial year. This will be followed by the polyethylene terephthalate (PET) resin plant at Dahej in the second half of the year. RIL also plans to double its paraxylene capacity at Jamnagar by January 2016.

PET, PTA and paraxylene are major chemicals used in the polyester and plastics industry.