Reliance Infrastructure Ltd., is India's largest private sector enterprise power utility and construction company. It is part of the Reliance Anil Dhirubhai Ambani Group, one of India's largest conglomerates. The company is headed by Anil Ambani. The corporate headquarters is in Mumbai. Reliance Infrastructure interests in Metro Rail, Airports, Bridges, Toll roads, Defence.It is major share holder in another group company Reliance Power