After discovery of oil in the Assam state of India in late 1880s, the first oil refinery was set up at Digboi.
[1] Following is a list of oil refineries in India, per the Petroleum Planning and Analysis Cell of the Ministry of Petroleum and Natural Gas, Government of India,[2] arranged in decreasing order of their capacity.
As a group, Indian Oil Corporation has the largest refining capacity, with nine refineries located across western, northern and north-eastern regions of India.
The Jamnagar Refinery by Reliance Industries Limited is the largest refinery in the world[3] and has the largest Nelson Complexity Index in India of 21.1.
[4] Various refineries are undergoing capacity expansions, and the Barmer Refinery was expected to be commissioned in January 2024.