Tata Sons increased its shareholding in Tata Power from 35 percent to 45 percent through a preferential allotment of Tata Power's shares in 2020. Moody's also noted Tata Power's role in supporting the decarbonization efforts of Tata group companies.Tata Power's shares closed 1.57 percent higher at ₹262.20 apiece on the BSE following the announcement.This rating upgrade reflects Tata Power's strong financial position and its potential to maintain healthy financial metrics in the coming years.