Oil & Natural Gas (ONGC)’s Green Building – Green Hills, was inaugurated in Dehradun recently. The iconic building is surrounded by the Sivalik range. The building has a total built up area of 14,600sqmt and is spread over five floors with the capacity to accommodate 620 persons. It can conserve water upto 30% through use of onsite sewage plant and low flow sanitary fittings. Rain water harvesting is also taken care of at the building. Four more ONGC green buildings are coming up at Delhi, Mumbai, Kolkata and Hyderabad.