Prime Minister Narendra Modi will formally inaugurate ONGC's new corporate office in New Delhi tomorrow. It has been renamed as Pandit Deendayal Upadhyaya Urja Bhawan. <br/><br/>The swanky but green-building, built at a cost of 600 crore rupees, was completed a year ago and now houses corporate office of India's largest oil and gas producer and its overseas subsidiary ONGC Videsh Ltd. Mr Modi will also unveil a statue of Deendayal Upadhyaya and address a gathering.