NEW DELHI: The S&P BSE Power index was up with most of its components trading higher in Wednesday's afternoon session.

Shares of Siemens (up 3.22 per cent), Thermax (up 1.47 per cent), ABB India (up 1.05 per cent) and Power Grid Corporation of India (up 0.83 per cent) were trading in the green.

NTPC (up 0.81 per cent), Reliance Infrastructure (up 0.68 per cent) and Bharat Heavy Electricals (up 0.67 per cent) too were trading higher.

The S&P BSE Power index was trading 0.43 per cent up at 2054.97 around 12:06 pm.

Benchmark NSE Nifty50 index was up 21.50 points at 11,734.70 while the BSE Sensex was up 127.25 points at 39,183.90.

Among the 50 stocks in the Nifty index, 23 were trading in the green, while 26 were in the red.

Shares of Suzlon Energy, Indian Energy Exchange, Tata Motors, Sobha, PNB, Reliance Power, SAIL, Reliance Communications, JP Associates, DHFL, Exide Inds., GMR Infra, YES Bank, DLF, Bharti Airtel and Bank of Baroda were among the most traded shares on the NSE.