The expansion of the Numaligarh Refinery in Assam is currently underway, and is expected to be completed by early 2025. Once completed, it will increase its refining capacity to nine MTPA.

The Numaligarh Refinery Expansion Project (NREP) involves constructing a new refinery with a crude processing capacity of six MTPA at an approved cost of Rs 28,026 crore. The project also includes setting up a crude oil import terminal at Paradip Port in Odisha and laying approx. 1,640 km of crude oil pipelines for transporting imported crude oil to Numaligarh. The crude pipeline passes through five states and all major rivers, namely Ganga, Jia Bharali, Subansiri and Brahmaputra.

The refinery primarily produces motor spirit (MS) and high-speed diesel (HSD) conforming to BS-IV/VI specifications. Additionally, the project is integrated with a 654 km product pipeline from Numaligarh to Siliguri, where Numaligarh Refinery (NRL) operates its own marketing terminal for product distribution.

In May 2021, the Assam government increased its stake in the refinery from 12.35 percent to 26 percent, with an investment of Rs 2,187 crore. NRL is the largest of the four refineries operating in Assam.