Shares of Tata Power Company Ltd. declined over 2% in Thursday's opening trade after global brokerage firm Goldman Sachs said it expects the stock to fall as much as 45% over the next 12 months. The brokerage has a 'Sell' rating on the Tata Power stock and a price target of ₹240 per share, suggesting a potential downside of 45% from the stock's closing level on Wednesday.