The Sensex opened with a positive gap of 47 points at 13,649. The index touched a high of 13,712, and is now up 92 points at 13,694.All Sensex stocks are in positive territory.NTPC has moved up 1.7% to Rs 152, and Reliance Energy has added 1.4% to Rs 538.Reliance Communications, Gujarat Ambuja, SBI, Bajaj Auto, Satyam, HDFC Bank, Tata Motors and Maruti have advanced over 1% each.