TP Solar Ltd, part of Indian electric utility Tata Power Co Ltd’s (<a href="https://www.bseindia.com/stock-share-price/tata-power-coltd/tatapower/500400/" target="_blank">BOM:500400</a>) renewable energy business, has officially opened a 4.3-GW factory for photovoltaic (PV) cells in modules in the state of Tamil Nadu.