About half a dozen investors, including Abu Dhabi Future Energy Company PJSC - Masdar, Petronas-owned Gentari, Singapore's Sembcorp Industries Ltd. (SGX:U96), Public Sector Pension Investment Board and Brookfield Corporation (TSX:BN), are vying to acquire Ayana Renewable Power Private Limited, a clean energy platform owned by the National Investment and Infrastructure Fund (NIIF), multiple people aware of the talks told ET.