The stake sale could help ReNew bag another deep-pocketed investor that can help the company grow. : Mumbai: Canada Pension Plan Investment Board (CPPIB) is in talks to increase its stake in renewable energy company ReNew Power Ltd by purchasing some of the shares that larger shareholder Goldman Sachs has put up for sale, two people aware of the development said. Founded by Sumant Sinha in 2011, ReNew Power has 5.85 gigawatts (GW) of renewable power capacity across wind and solar projects. Of this, 3.92GW is operational.