Oil India Limited’s Numaligarh-Siliguri Product Pipeline (NSPL) capacity augmentation project was inaugurated by Prime Minister Narendra Modi at a public event in Guwahati on March 13, 2026.
Originally intended to transport 1.72 million metric tonnes per annum (MMTPA), the 654-km cross-country multi-product pipeline has a diameter of 406 mm (16-inch). As a result of the renovation, its capacity has been increased to 5.5 MMTPA, which would help satisfy the North-East government’s Hydrocarbon Vision 2030 goal of Numaligarh Refinery Limited’s expansion from 3.0 MMTPA to 9.0 MMTPA.
Key infrastructure upgrades, including as the transformation of pigging stations at Sekoni, Guwahati, Bongaigaon, and Madarihat into intermediate pumping stations, allowed for the augmentation to be realised. The Numaligarh dispatch terminal’s pumping facilities were also reinforced, while the Siliguri reception terminal’s operational facilities were renovated to make them more efficient and safer.
The expansion, which was carried out as a brownfield project, was finished at a cost of approximately ₹750 crore, less than the original budget of ₹860 crore. This resulted in cost savings through the optimisation of existing assets.
For almost three years, workers in Assam and West Bengal put in an estimated 4.1 million man-hours as the project was being built.
As a whole, the rebuilt pipeline will help India achieve its energy security goals and would greatly improve the North-East’s infrastructure for transporting petroleum products.
