Oil & Natural Gas Corporation Ltd.
In the year 1956, ONGC has established its Head Quarters in the famous Building, TelBhawan(Patiala House), at Dehradun. ONGC is the premier exploration and production company in India and accounts for 90% of the exploration effort, established reserves and production of oil and gas in the country. ONGC have built an organization with fiscal, technical and managerial strength to match any large oil company in the world. It is thus obvious that ONGC would continue to be a major force in the Indian oil industry in the foreseeable future.