Oil and Natural Gas Corporation (ONGC) has won a bid to acquire PTC India Ltd's wind power unit for Rs 925 crore as the state-owned firm continues to build a renewable energy portfolio to balance its fossil fuel business. In a stock exchange filing, India's top oil and gas producer said it has over the years diversified into the petrochemicals and power business besides growing its core business of finding hydrocarbons. ONGC said it has taken various initiatives for renewable energy power generation and already has 189 megawatt (MW) capacity, including wind and solar PV plants spread across various locations.