=् NTPC ( National Thermal Power Corporation Limited)➖New Delhi
👉 BHEL ( Bharat Heavy Electricals Limited)➖New Delhi
👉 GAIL ( Gas authority of India limited)➖New Delhi
👉 ONGC ( Oil & Natural Gas Corporation Limited )➖New delhi
👉 BPCL ( Bharat Petroleum Corporation Limited)➖Mumbai
👉 SAIL( Steel Authority of India Limited)➖New Delhi
👉 CIL ( Coal India Limited)➖Kolkata
👉 IOC ( Indian Oil Corporation)➖New Delhi
👉HPCL ( Hindustan Petroleum Corporation Ltd )➖Mumbai
👉PGCIL ( Power Grid Petroleum Corporation of india Ltd )➖Gurgaon
