Indian oil and gas explorer Oil and Natural Gas Corp (<a href="https://www.bseindia.com/stock-share-price/oil-and-natural-gas-corporation-ltd/ongc/500312/" target="_blank">BOM:500312</a>), or ONGC, has acquired PTC Energy, the clean energy arm of domestic power trading group PTC India (<a href="https://www.bseindia.com/stock-share-price/ptc-india-ltd/ptc/532524/" target="_blank">BOM:532524</a>) which owns an almost 290-MW onshore wind fleet.