Indian state-run energy company NTPC Ltd (<a href="https://www.bseindia.com/stock-share-price/ntpc-ltd/ntpc/532555/" target="_blank">BOM:532555</a>) and oil and gas firm ONGC (<a href="https://www.bseindia.com/stock-share-price/oil-and-natural-gas-corporation-ltd/ongc/500312/" target="_blank">BOM:500312</a>) have finalised the acquisition of Ayana Renewable Power, a domestic renewables platform with a roughly 4-GW portfolio.