The Guwahati Refinery of Indian Oil Corporation supplied 19,000 metric tonnes of smokeless fuel to the Indian Army during Operation Sindoor. Sunil Kanti, executive director of the refinery, said it is one of the few units in India that can produce Low Sulphur Low Aromatics SKO (LSLA SKO). This special fuel was requested by the army to keep soldiers warm in cold, high-altitude areas. "The Indian Army had requested us sometime back to produce a special fuel, which would not emit smoke. They wanted it to keep our soldiers warm in extreme cold conditions. Usually, all types of fuels emit smoke when they are burned," said Mr. Kanti. The LSLA SKO developed by the refinery contains only about 1 ppm sulphur and 2-3% aromatics, below the set limits. It also has a 30 mm smoke point, making it smokeless. The fuel was delivered to Misamari, Siliguri, and Agra before reaching army bases in Arunachal Pradesh, Sikkim, and Ladakh. "During Operation Sindoor, only our refinery produced and supplied 19 TMT of LSLA SKO within record time," added Kanti. "This is a matter of pride that Guwahati Refinery played an important role during the country’s defence mechanism in Operation Sindoor." Guwahati Refinery, established in 1962, recently increased its capacity to 1.2 million metric tonnes per annum. About 40% of its crude comes from Assam while 60% is imported. The refinery is also building a Catalytic Reforming Unit (CRU), expected by May 2026, to produce reformate gasoline domestically and reduce imports. Mr. Kanti said, "We at present do not have the facility to produce reformate, which is a low-sulphur and high-octane-number gasoline blend component from Naphtha. This stream is required for the production of gasoline and is currently imported from other refineries." The new CRU, with 90 KTPA capacity, will help Guwahati Refinery become self-sufficient in gasoline production.